Corporations, Partnerships, and Pass-Through Taxation

Corporations, Partnerships, and Pass-Through Taxation

The federal taxation of a business depends not only on how much money the business earns, but also on who is treated as the taxpayer.

This is one of the most important distinctions in U.S. business taxation. Two businesses can earn exactly the same amount of economic profit and yet produce very different federal tax consequences because they operate through different legal and tax structures.

A C corporation, for example, is generally treated as a separate taxpayer. It calculates its own taxable income and generally pays federal corporate income tax. If it later distributes after-tax profits to shareholders as dividends, those dividends may be taxed again at the shareholder level.

A partnership, by contrast, generally does not pay federal income tax on its ordinary business income as an entity. Instead, the partnership calculates its taxable results and passes the appropriate items through to its partners.

An S corporation similarly generally passes its income, deductions, gains, losses, and credits through to its shareholders, subject to the special rules of Subchapter S.

This system is commonly called pass-through taxation.

The basic concept is summarized by Cornell Law School’s explanation of pass-through taxation: instead of the business itself being subject to the ordinary entity-level income tax, qualifying business income generally passes through to the owners, who take the applicable amounts into account on their own tax returns. (Legal Information Institute)

Understanding this distinction is essential to understanding partnerships, S corporations, C corporations, LLCs, business distributions, owner taxation, business losses, basis, and many of the tax consequences that arise when a business changes its structure.

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Key Facts

• A business can be organized under state law in one form while receiving a different federal tax classification.
• A C corporation is generally a separate federal income taxpayer.
• A partnership generally does not pay federal income tax on its ordinary income; its taxable items generally pass through to its partners.
• An S corporation generally passes taxable income, deductions, gains, losses, and credits through to its shareholders.
• Pass-through taxation means that taxation generally occurs at the owner level rather than through the ordinary corporate income tax at the entity level.
• Partnership income may be taxable to a partner even if the partnership does not distribute an equivalent amount of cash.
• S corporation shareholders similarly may owe tax on their allocated share of corporate income even when the corporation retains some of its earnings.
• A partner’s distributive share is governed by complex statutory and partnership-agreement rules.
• S corporation shareholders must generally consider their stock and debt basis before claiming certain pass-through losses.
• Partnership and S corporation distributions are not necessarily identical to taxable income.
• A C corporation can face taxation at both the corporate and shareholder levels when corporate profits are distributed as dividends.
• An S corporation election is a federal tax election; it does not create a separate type of state-law corporation.
• An LLC may be classified federally as a disregarded entity, partnership, C corporation, or S corporation depending on its ownership and elections.
• Pass-through taxation does not mean “no tax.” It means that the tax is generally imposed at a different level.
• Partnerships and S corporations still have substantial filing, reporting, accounting, and recordkeeping obligations.
• Pass-through losses are subject to limitations such as basis, at-risk, passive-activity, and other rules.
• The legal structure of a business and its federal tax classification should therefore be analyzed separately.

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1. The Central Question: Who Pays the Tax?

The most useful way to understand business taxation is to ask a simple question:

When a business earns $1 of taxable income, who is legally responsible for the federal income tax on that dollar?

The answer depends on the business structure and its federal tax classification.

Consider four simplified examples.

Business A — Sole Proprietorship

An individual operates a consulting business directly.

The business earns $100,000 of net profit.

The individual generally reports that business income on the individual’s federal tax return.

Business B — Partnership

Two people operate a business through a partnership.

The partnership earns $200,000 of taxable income.

The partnership generally reports the income but does not itself pay federal income tax on that ordinary income. Instead, the partners generally report their respective shares.

Business C — S Corporation

A corporation has made a valid S corporation election.

It earns $200,000 of taxable income.

The S corporation generally reports the income, but the applicable tax items generally pass through to the shareholders.

Business D — C Corporation

A corporation earns $200,000 of taxable income.

The corporation is generally itself subject to federal corporate income tax.

If it subsequently distributes some of its after-tax profits to shareholders as dividends, those dividends may create a separate shareholder-level tax.

The businesses have the same fundamental economic activity—earning profit—but the taxpayer differs.

That is the foundation of pass-through taxation.

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2. What Is Pass-Through Taxation?

Pass-through taxation means that certain business income is generally not subjected to the ordinary federal income tax at the business-entity level. Instead, the taxable items are passed through to the owners.

The owners then report the applicable items on their own tax returns.

The term “pass-through” is therefore descriptive.

The income does not literally disappear from the business.

Rather, the tax consequences flow through the entity.

The principal federal examples are:

• partnerships;
• S corporations;
• sole proprietorships; and
• many LLCs, depending on their federal classification.

Cornell’s Legal Information Institute explains that pass-through taxation generally applies where the entity itself does not pay the ordinary income tax on the business’s income and the income instead passes to the owners. (Legal Information Institute)

This is fundamentally different from the ordinary taxation of a C corporation.

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3. C Corporations: Separate Taxpayers

A C corporation is generally treated as a legal and tax entity separate from its shareholders.

The corporation owns its property, enters into contracts, earns income, incurs expenses, and calculates its own taxable income.

The IRS describes a C corporation as a separate taxpaying entity that conducts business, realizes income or loss, pays taxes, and may distribute profits to shareholders. (Internal Revenue Service)

The corporation generally files Form 1120, U.S. Corporation Income Tax Return.

Under 26 U.S.C. §11, the federal corporate income tax generally applies to the taxable income of corporations, with the general corporate rate set at 21%. (Internal Revenue Service)

This produces a basic structure:

Corporate income

↓

Corporate deductions

↓

Corporate taxable income

↓

Corporate federal income tax

↓

After-tax corporate earnings

↓

Possible dividend to shareholder

↓

Possible shareholder-level tax

This is commonly referred to as double taxation.

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4. Why Is C Corporation Taxation Called Double Taxation?

Suppose a corporation earns $1 million of taxable income.

The corporation is generally responsible for its own federal income tax.

After paying that tax, it retains the remaining earnings.

If the corporation distributes part of those earnings as a dividend, the shareholder may have taxable dividend income.

The same underlying corporate earnings have therefore been taxed at two different levels:

1. corporate level, when the corporation earned the income; and
2. shareholder level, when taxable dividends were distributed.

The corporation generally does not receive an income-tax deduction simply because it paid dividends to shareholders. The IRS specifically describes this two-level structure when explaining C corporations. (Internal Revenue Service)

This does not mean that every dollar earned by a corporation is necessarily taxed twice immediately.

A corporation can retain earnings rather than distribute them.

Shareholders may also have different tax consequences when they sell stock rather than receive dividends.

Nevertheless, the possibility of taxation at both levels is a defining characteristic of the C corporation.

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5. Partnerships: The Classic Pass-Through Model

A partnership is one of the clearest examples of pass-through taxation.

For federal tax purposes, a partnership generally files an information return but does not itself pay federal income tax on its ordinary business income.

26 U.S.C. §701 provides the basic rule: the partnership itself is generally not subject to the federal income tax imposed by the Internal Revenue Code; the partners are subject to tax in their separate or individual capacities. (Legal Information Institute)

The IRS similarly explains that a partnership files an annual information return reporting its income, deductions, gains, losses, and other items but generally passes profits and losses through to its partners. (Internal Revenue Service)

This produces a fundamentally different structure from a C corporation.

Instead of:

Business → corporate tax → shareholder dividend

the simplified partnership model is:

Partnership → partner’s distributive share → partner’s tax return

The partnership therefore functions partly as a computational and reporting entity, while the partners generally bear the federal income tax liability on the income allocated to them.

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6. Partnership Income Does Not Depend Entirely on Cash Distributions

One of the most important concepts in pass-through taxation is that taxable income and cash distributions are not necessarily the same thing.

Suppose a partnership earns $300,000.

Assume Partner A is allocated $150,000 of taxable income.

The partnership might distribute only $75,000 in cash to Partner A and retain the remaining $75,000 for working capital.

Partner A generally does not escape taxation on the $75,000 that was retained.

The partner’s tax liability is based on the applicable taxable items allocated to the partner—not simply on the amount of cash actually received.

The IRS expressly explains that partners generally must report their distributive shares of partnership income whether or not the income is actually distributed to them. (Internal Revenue Service)

This is sometimes called phantom income in informal discussions: income that creates a tax liability even though the owner did not receive an equivalent cash distribution.

The concept is extremely important for anyone involved in a pass-through business.

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7. The Partnership Tax Return

A partnership generally files Form 1065, U.S. Return of Partnership Income.

The partnership reports items such as:

• income;
• gains;
• losses;
• deductions;
• credits;
• and other tax information.

The partners generally receive Schedule K-1, which identifies their respective shares of relevant partnership items.

The K-1 therefore functions as a bridge between the partnership’s tax computations and the partners’ individual tax returns.

The partnership itself may have no ordinary federal income tax liability, but it still has extensive reporting obligations.

This illustrates an important distinction:

Not paying entity-level income tax does not mean not having entity-level tax responsibilities.

A partnership must still maintain records, calculate taxable items, file its information return, furnish required schedules, and comply with federal reporting requirements.

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8. How Partnership Allocations Work

The phrase distributive share is central to partnership taxation.

A partner’s distributive share is the partner’s share of the partnership’s income, gain, loss, deduction, credit, or other relevant tax items.

Under 26 U.S.C. §704, a partner’s distributive share is generally determined according to the partnership agreement, subject to detailed federal limitations. If the agreement does not provide an effective allocation, federal tax law supplies rules based on the partner’s interest in the partnership. (Legal Information Institute)

This means that partnership taxation cannot always be understood by simply looking at the percentage of cash each partner receives.

For example, a partnership might have:

• unequal capital contributions;
• special allocations;
• preferred economic arrangements;
• different rights to distributions;
• or other provisions affecting how economic results are shared.

Federal tax law imposes requirements designed to prevent partnership allocations from being used merely as artificial devices for moving tax consequences between partners.

The tax analysis therefore examines both the partnership agreement and the federal rules governing allocations.

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9. Separate Character of Partnership Tax Items

Another important feature of partnership taxation is that different types of income and deductions can retain their tax character as they pass through to partners.

For example, partnership items may include:

• ordinary business income;
• capital gains;
• capital losses;
• charitable contributions;
• tax credits;
• foreign taxes;
• and other separately stated items.

Under 26 U.S.C. §702, partners generally take into account their distributive shares of separately treated partnership items, and the character of an item generally carries through as though the partner had realized it directly from the underlying source. (Legal Information Institute)

This prevents a partnership from simply blending every type of income into one undifferentiated number.

The character of the income matters because different categories of income can be taxed under different rules.

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10. Partnership Basis

Another fundamental concept is basis.

A partner generally has a tax basis in the partnership interest.

That basis can change over time.

Under 26 U.S.C. §705, a partner’s basis is generally increased by certain partnership income and tax-exempt income and decreased by certain distributions, losses, and other items. (Legal Information Institute)

This matters because basis can determine whether a partner is entitled to recognize particular losses and can affect the taxation of distributions and dispositions of the partnership interest.

A simplified conceptual model is:

Beginning basis

+ qualifying income and contributions

− qualifying distributions and losses

= adjusted basis

The actual rules are considerably more detailed.

Basis is therefore not merely a bookkeeping number. It is an important tax measurement that follows the owner’s economic and tax relationship with the entity.

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11. Partnership Losses Are Not Automatically Deductible

A partner may receive a Schedule K-1 showing a partnership loss.

That does not automatically mean the partner can deduct the entire loss.

Several limitations may apply.

These can include:

• basis limitations;
• at-risk limitations;
• passive activity loss rules;
• excess business loss rules;
• and other provisions of federal tax law.

The basis limitation is particularly fundamental.

A partner generally cannot use partnership losses to create an unlimited tax deduction disconnected from the partner’s tax investment in the partnership.

This principle protects the distinction between actual economic exposure and tax deductions.

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12. S Corporations: Corporate Form With Pass-Through Taxation

An S corporation occupies a distinctive position.

Legally, it is generally a corporation.

For federal tax purposes, however, a qualifying corporation can elect treatment under Subchapter S, causing many of its income-tax items to pass through to its shareholders.

The IRS explains that S corporations are corporations that elect to pass corporate income, losses, deductions, and credits through to shareholders for federal tax purposes. (Internal Revenue Service)

This creates an important conceptual distinction:

S corporation status is primarily a federal tax election.

It does not mean that the business ceases to be a corporation under state law.

Instead, the corporation retains its corporate legal structure while receiving special federal tax treatment.

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13. How S Corporation Pass-Through Taxation Works

Suppose an S corporation earns $300,000 of taxable income.

If there are three shareholders with equal ownership and the applicable tax rules produce equal allocations, each shareholder may receive approximately $100,000 of pass-through income.

The corporation generally reports the income on Form 1120-S.

Each shareholder receives a Schedule K-1 reflecting the shareholder’s share of relevant income, deductions, credits, and other items.

The shareholder then reports those items on the shareholder’s federal tax return.

The basic structure is:

S corporation

↓

Taxable income

↓

Allocation among shareholders

↓

Schedule K-1

↓

Shareholder tax returns

This is fundamentally different from the normal C corporation model.

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14. S Corporation Shareholder Eligibility

Not every corporation can simply choose S corporation treatment.

Federal law establishes eligibility requirements.

The IRS identifies several requirements, including that the corporation must generally:

• be a domestic corporation;
• have only allowable shareholders;
• have no more than 100 shareholders;
• generally have only one class of stock; and
• not be an ineligible corporation under the statutory rules. (Internal Revenue Service)

Certain entities and persons cannot generally be S corporation shareholders.

For example, partnerships and corporations generally cannot be shareholders, and nonresident alien individuals generally cannot be shareholders.

The corporation generally makes the election using Form 2553.

Thus, S corporation taxation is not an automatic consequence of forming a corporation.

It requires both eligibility and a valid federal election.

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15. S Corporation Basis

S corporation shareholders also have basis considerations.

A shareholder’s stock basis can generally change as a result of the corporation’s income, losses, deductions, distributions, and other tax items.

This becomes particularly important when the corporation has losses.

The IRS emphasizes that S corporation shareholders must consider stock and debt basis when determining whether they may claim pass-through losses. (Internal Revenue Service)

A Schedule K-1 showing a $50,000 loss does not automatically mean the shareholder can deduct $50,000.

The shareholder must first satisfy applicable basis requirements and then consider additional limitations.

The IRS identifies four principal shareholder loss limitations:

1. stock and debt basis;
2. at-risk limitations;
3. passive activity loss limitations; and
4. excess business loss limitations. (Internal Revenue Service)

This is an excellent example of why pass-through taxation should not be confused with unrestricted access to business deductions.

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16. S Corporation Distributions

S corporations also illustrate the distinction between income allocation and cash distribution.

A shareholder may be allocated taxable income even if the corporation retains cash.

Conversely, a shareholder may receive a distribution that is not automatically treated as taxable income in the same way as a dividend from a C corporation.

The tax treatment of an S corporation distribution depends substantially on the shareholder’s stock basis and the applicable federal rules.

The IRS explains that a non-dividend S corporation distribution is generally tax-free to the extent it does not exceed the shareholder’s stock basis, subject to the applicable rules. (Internal Revenue Service)

Therefore:

K-1 income ≠ cash distribution

and:

cash distribution ≠ automatically taxable income

These distinctions are fundamental to understanding S corporation taxation.

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17. S Corporation Compensation and Shareholder-Employees

S corporations create another important tax distinction involving owners who work for the corporation.

A shareholder who also performs services for an S corporation may be an employee of the corporation.

This means the corporation can have both:

• pass-through business income; and
• employee compensation paid to shareholder-employees.

Compensation can therefore be subject to employment-tax rules, while the shareholder’s allocated share of S corporation income is handled under the pass-through rules.

This distinction is one reason why S corporation taxation can become substantially more complex than simply dividing corporate profit among shareholders.

The federal tax system does not permit the corporate structure to erase the ordinary employment-tax consequences of compensation for services.

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18. C Corporation Versus S Corporation

The difference can be summarized conceptually.

Feature	C Corporation	S Corporation
Legal corporate form	Corporation	Corporation
Federal income-tax treatment	Generally entity-level	Generally pass-through
Corporate income tax	Generally yes	Generally no regular corporate income tax
Shareholder taxation	Possible on dividends	Generally on allocated pass-through items
Double taxation	Possible	Generally avoided at federal income-tax level
Ownership restrictions	Generally broader	Significant statutory restrictions
Number of shareholders	Generally not subject to S-corp limit	Generally no more than 100
Stock classes	Generally flexible	Generally one class
Foreign individual shareholders	Permitted	Nonresident aliens generally not permitted
Federal election	C corporation treatment generally default	Form 2553 required

The table is only a simplified overview. Each structure has numerous additional rules.

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19. Partnership Versus S Corporation

Partnerships and S corporations are both pass-through structures, but they are not taxed identically.

A partnership generally allows substantial flexibility in allocating economic and tax items, subject to the Internal Revenue Code.

S corporations generally operate under stricter ownership and allocation rules.

A partnership may have partners with different economic arrangements.

An S corporation generally allocates many items according to shareholder ownership and the applicable statutory rules.

This means that the two forms should not be treated as interchangeable simply because both are pass-through entities.

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20. Why Pass-Through Taxation Does Not Mean “No Tax”

One of the most persistent misunderstandings about pass-through entities is the idea that they are “not taxed.”

That statement is incomplete.

A partnership generally does not pay the ordinary federal income tax on its business income at the entity level.

But the partners generally pay tax on their taxable shares.

Similarly, an S corporation generally does not pay the regular corporate income tax on most of its income.

But its shareholders generally report their allocated shares.

The correct distinction is:

C corporation: tax generally occurs at the corporate level and potentially again at the shareholder level.

Pass-through entity: tax generally flows through the entity and is imposed at the owner level.

Pass-through taxation therefore changes where and how the tax is imposed, not whether taxable income exists.

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21. Pass-Through Income and the Qualified Business Income Deduction

Pass-through taxation also interacts with the Qualified Business Income deduction under IRC §199A.

Section 199A can provide qualifying noncorporate taxpayers with a deduction based on qualified business income, subject to statutory limitations.

This provision is important because it can affect the ultimate individual-level tax consequences of income received through certain pass-through businesses.

The deduction is not simply a universal 20% reduction of every business owner’s income.

The calculation can depend on:

• taxable income;
• the type of business;
• wages;
• qualified property;
• specified service trade or business rules;
• and other statutory limitations.

Thus, the pass-through structure is only one part of the calculation.

A business owner may first determine the amount of taxable income passing through from the business and then determine whether and to what extent §199A applies.

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22. LLCs and Pass-Through Taxation

LLCs demonstrate particularly well why legal form and federal tax classification are separate concepts.

An LLC is created under state law.

For federal income-tax purposes, however, the IRS may treat an LLC as:

• a disregarded entity;
• a partnership;
• a C corporation; or
• an S corporation.

The classification depends on the number of members, applicable default rules, and elections made by the entity.

The IRS explains that a domestic single-member LLC is generally disregarded for federal income-tax purposes unless it elects corporate treatment. A domestic LLC with two or more members is generally classified as a partnership unless it elects corporate treatment. (Internal Revenue Service)

An eligible LLC can also elect S corporation treatment if it satisfies the applicable requirements.

Therefore, saying:

“This is an LLC”

does not answer the federal tax question.

The more useful question is:

“How is this LLC classified for federal tax purposes?”

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23. Disregarded Entities

A disregarded entity is an entity that exists under state law but is generally ignored as a separate entity for federal income-tax purposes.

The most common example is a single-member LLC that has not elected corporate taxation.

If an individual owns such an LLC and operates a trade or business through it, the business activity generally appears directly on the owner’s federal tax return.

The IRS explains that an individual-owned single-member LLC classified as a disregarded entity generally reports its activities through the owner’s applicable federal return, including Schedule C where appropriate. (Internal Revenue Service)

This is an important reminder that an entity can provide a legal structure without necessarily creating a separate federal income-taxpayer.

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24. The Difference Between Ownership and Taxation

Business ownership and tax liability are related but not identical concepts.

A person may own stock in a corporation.

A person may own a partnership interest.

A person may be a member of an LLC.

The ownership interest determines economic rights, but federal tax law determines how the resulting income, deductions, gains, losses, and distributions are treated.

For example, owning 40% of a partnership does not necessarily mean that every tax item will always be exactly 40% of every dollar of economic activity.

Similarly, owning 40% of an S corporation generally does not mean that the shareholder simply receives 40% of the corporation’s cash.

The tax system has its own rules for allocations, basis, distributions, compensation, and other transactions.

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25. Distributions Versus Allocations

This distinction deserves special emphasis.

An allocation generally determines how a tax item is attributed to an owner.

A distribution generally involves the transfer of cash or property from the entity to the owner.

They are not the same event.

A partnership could allocate $100,000 of taxable income to a partner but distribute only $40,000 of cash.

An S corporation could allocate $100,000 of taxable income to a shareholder while retaining substantial corporate cash.

A C corporation could earn $100,000, pay corporate tax, retain its earnings, and later distribute dividends.

Tax law treats each event under different rules.

Confusing allocations with distributions is one of the easiest ways to misunderstand pass-through taxation.

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26. Why Owners Can Owe Tax Before Receiving Cash

Suppose a partnership earns $1 million.

The partners decide to retain the entire amount to finance expansion.

The business may still have taxable income.

The owners therefore may owe federal income tax without receiving an equivalent cash distribution.

This can create an important business-planning problem.

Owners of pass-through businesses must often reserve sufficient cash to pay their personal tax liabilities arising from business income.

The business’s decision to reinvest profits does not necessarily eliminate the owner’s tax obligation.

This is one reason why distributions from pass-through entities are often discussed in connection with tax distributions—cash distributions intended to help owners meet their tax liabilities.

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27. Federal Tax Treatment of Losses

Pass-through taxation also affects business losses.

Suppose a partnership produces a $100,000 tax loss.

The loss generally passes to the partners according to the applicable allocation rules.

But each partner must then determine whether the loss is currently deductible.

The same principle applies to S corporation shareholders.

The federal tax system imposes limitations designed to prevent taxpayers from using losses beyond the economic investment or exposure contemplated by the tax rules.

Relevant concepts include:

Basis

The owner generally must have sufficient basis.

At-risk rules

The taxpayer generally must have sufficient economic exposure to the activity.

Passive activity rules

Passive losses may be restricted from offsetting nonpassive income.

Excess business loss rules

Additional limitations may apply to certain taxpayers with substantial business losses.

Thus:

Pass-through loss ≠ automatically deductible loss.

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28. Partnership and S Corporation Tax Returns

Pass-through entities still file federal tax returns.

A partnership generally files:

Form 1065

An S corporation generally files:

Form 1120-S

These returns allow the IRS to see how the entity calculated its income and how the relevant tax items are being allocated to owners.

Owners generally receive Schedule K-1 information.

The reporting system therefore has at least two levels:

Entity-level reporting

and

Owner-level taxation.

This is another reason the phrase “pass-through” should not be interpreted as meaning that the business itself has no tax responsibilities.

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29. Partnership Self-Employment Tax

Partnership taxation also intersects with self-employment tax.

The IRS generally treats members of partnerships carrying on a trade or business as self-employed rather than employees of the partnership. (Internal Revenue Service)

The precise treatment depends on the partner’s role, the type of partnership interest, and the nature of the income.

This is an important difference from a shareholder of a C corporation or an S corporation employee.

The federal system therefore distinguishes between:

• partnership income;
• self-employment income;
• employee wages;
• shareholder distributions;
• and corporate earnings.

These categories should not be treated as interchangeable.

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30. Corporate Earnings and Retained Profits

A C corporation can retain earnings instead of distributing them.

This can be important for businesses that need capital for:

• expansion;
• inventory;
• research;
• equipment;
• acquisitions;
• hiring;
• debt reduction;
• or other corporate purposes.

Retaining earnings does not eliminate the corporation’s tax on taxable corporate income.

The corporation generally pays its federal income tax whether or not it distributes the after-tax earnings to shareholders.

The later distribution of those earnings can create a separate shareholder-level tax event.

Thus:

Corporate taxable income

and

corporate cash available for distribution

are different concepts.

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31. Shareholders and Dividends

When a C corporation distributes earnings to shareholders in the form of dividends, the shareholder generally reports the dividend under the applicable federal rules.

The corporation generally does not deduct the dividend as an ordinary business expense.

This is the structural reason C corporation taxation can result in two levels of taxation.

The corporation’s payment of a dividend is therefore fundamentally different from paying a deductible business expense such as rent or employee compensation.

A dividend is a distribution of corporate value to an owner, not a cost of producing the corporation’s revenue.

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32. Corporate Losses Do Not Automatically Belong to Shareholders

Another fundamental difference between C corporations and pass-through entities concerns losses.

If a C corporation experiences a $500,000 loss, the shareholder does not simply deduct $500,000 on the shareholder’s personal tax return.

The corporation is the taxpayer.

The corporation must apply the rules governing its own losses.

This is very different from a partnership or S corporation, where qualifying losses may pass through to owners subject to the applicable limitations.

The separation between the corporation and its shareholders is therefore central to C corporation taxation.

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33. The Tax Significance of Business Structure

Choosing a business structure can affect:

• who pays federal income tax;
• whether income is taxed once or potentially twice;
• how losses are used;
• how owners receive compensation;
• how distributions are taxed;
• how ownership can be structured;
• what tax elections are available;
• what reporting obligations apply;
• and how the business can raise capital.

The IRS emphasizes that selecting a business structure affects the federal income tax return a business must file and that both legal and tax considerations are relevant. (Internal Revenue Service)

This does not mean that there is a universally “best” entity.

A structure appropriate for a closely held operating business may be inappropriate for a company seeking institutional investment.

A structure useful for a business expecting immediate distributions may differ from one designed to retain earnings and reinvest capital.

Taxation is therefore one component of a much larger legal and commercial decision.

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34. A Comparative Example

Consider three businesses, each earning $500,000 of taxable business income before owner-level considerations.

Business One: C Corporation

The corporation calculates its taxable income and generally pays federal corporate income tax.

After-tax earnings may remain inside the corporation or be distributed to shareholders.

A dividend can create a second level of taxation.

Business Two: Partnership

The partnership generally does not pay federal income tax on its ordinary business income.

Instead, the $500,000 of taxable income is allocated among the partners under the applicable rules.

The partners report their respective shares.

Business Three: S Corporation

The S corporation generally does not pay the regular corporate income tax on its pass-through income.

The applicable income and other tax items generally pass through to the shareholders.

The shareholders report their respective shares.

All three businesses earned the same economic amount.

Yet their federal tax systems are fundamentally different.

This is the central lesson of entity taxation.

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35. Pass-Through Taxation Is a System of Allocation

It is tempting to think of pass-through taxation as simply “sending the profit to the owners.”

That is too simplistic.

Pass-through taxation is really a system of allocating tax attributes.

Income may pass through.

Losses may pass through.

Deductions may pass through.

Credits may pass through.

Capital gains may pass through.

Tax-exempt income may pass through.

Other specially characterized items may pass through.

The owner therefore receives more than a simple dollar amount.

The owner receives tax information describing the nature and amount of the items that must be taken into account.

That is why Schedule K-1 is so important in partnership and S corporation taxation.

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36. Why the Character of Income Matters

Suppose a pass-through business has:

• $200,000 ordinary business income;
• $30,000 long-term capital gain; and
• $10,000 charitable contribution.

The owner cannot necessarily combine all three into one $240,000 number and apply one tax rule.

Federal tax law can require the items to retain their separate character.

That affects:

• the applicable tax rate;
• deduction limitations;
• reporting location;
• tax credits;
• basis;
• and other calculations.

Pass-through taxation therefore requires not only allocation, but also character preservation.

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37. Pass-Through Taxation and Business Planning

Because pass-through taxation places tax consequences directly on owners, business owners must plan for the personal consequences of business activity.

A profitable business may create:

• federal income tax liability;
• self-employment tax for certain owners;
• estimated tax obligations;
• state tax obligations;
• and other liabilities.

The business may therefore need to make distributions sufficient to help owners meet their tax obligations.

At the same time, excessive distributions can deprive the business of capital needed for operations.

This creates a practical tension:

retain cash for the business

versus

distribute cash to owners who owe tax on pass-through income.

Understanding the difference between taxable income and cash is therefore essential to business management.

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38. Changing From One Tax Classification to Another

A business can sometimes change its federal tax classification.

For example, an eligible corporation may elect S corporation treatment.

An LLC may elect to be taxed as a corporation.

A business can also undergo transactions that change its ownership structure or tax status.

These changes can produce significant federal tax consequences.

A change in classification is therefore not merely an administrative decision.

It may affect:

• basis;
• built-in gains;
• distributions;
• assets;
• liabilities;
• depreciation;
• ownership;
• reporting;
• and future taxation.

The federal tax consequences of changing classification must therefore be considered before the election or restructuring takes effect.

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39. Pass-Through Taxation and the Modern Business Economy

Pass-through taxation is particularly significant because a large portion of U.S. business activity occurs through entities that are not taxed like traditional C corporations.

Partnerships and LLCs can be used for businesses ranging from small professional practices to large investment enterprises.

S corporations are frequently used by closely held operating businesses.

The tax system therefore has to coordinate business-level accounting with owner-level taxation.

This creates a structure in which the business can be economically separate from its owners while still passing tax consequences directly to those owners.

That combination is one of the defining characteristics of modern U.S. business taxation.

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40. The Relationship Between Legal Liability and Taxation

A crucial distinction must be maintained between limited liability and pass-through taxation.

They are not the same thing.

Limited liability generally concerns whether owners are personally liable for the entity’s debts and obligations.

Pass-through taxation concerns how federal tax consequences are imposed.

An LLC, for example, can generally provide a state-law limited-liability structure while receiving pass-through tax treatment.

An S corporation is a corporation with limited liability characteristics while generally receiving pass-through federal income-tax treatment.

A C corporation has corporate legal identity and generally separate federal taxation.

Thus:

liability protection ≠ tax classification.

The two concepts interact, but they answer different legal questions.

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41. The Importance of Basis in Pass-Through Taxation

Basis is one of the concepts that connects nearly every part of pass-through taxation.

For a partner, basis in a partnership interest can change as partnership income, losses, contributions, distributions, and other items occur.

For an S corporation shareholder, stock and certain debt basis can change based on the corporation’s operations.

Basis can affect:

• whether losses are deductible;
• whether distributions are taxable;
• gain or loss when an ownership interest is sold;
• and other tax consequences.

This is why owners should not simply assume that their basis equals the amount originally invested.

Pass-through taxation creates continuing adjustments to the owner’s tax position.

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42. What Pass-Through Taxation Does Not Mean

Pass-through taxation does not mean:

• the business does not have to file a return;
• the owners never pay tax;
• every business loss is deductible;
• every distribution is tax-free;
• every dollar distributed is taxable;
• the business has no accounting obligations;
• the business can ignore basis;
• the business is exempt from employment taxes;
• or an LLC automatically receives pass-through treatment.

Each of these statements would be incomplete or potentially wrong.

Pass-through taxation is a specific federal tax mechanism with detailed statutory requirements.

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Key Takeaways

1. The central question in entity taxation is who is treated as the taxpayer.
2. C corporations are generally separate federal income taxpayers. They calculate their own taxable income and generally pay corporate income tax.
3. Partnerships generally use pass-through taxation. The partnership reports its income and other tax items, while the partners generally report their distributive shares.
4. S corporations generally use pass-through taxation. Qualifying income, deductions, gains, losses, and credits generally flow through to shareholders.
5. Pass-through taxation does not mean tax-free income. It means that taxation generally occurs at the owner level rather than through the ordinary corporate income tax.
6. Taxable income and cash distributions are different concepts. Owners can owe tax on allocated income even when the business retains the cash.
7. Partnership allocations are governed by detailed federal rules. The partnership agreement matters, but federal tax law determines whether allocations receive the intended tax treatment.
8. Partnership and S corporation losses are subject to limitations. Basis, at-risk, passive-activity, and other rules can restrict deductions.
9. Basis is fundamental. It can affect the deductibility of losses, taxation of distributions, and gain or loss on the disposition of an ownership interest.
10. S corporation status requires a federal election and eligibility requirements. It is not simply another name for a corporation.
11. LLCs can receive several different federal tax classifications. An LLC may be treated as a disregarded entity, partnership, C corporation, or S corporation depending on the circumstances.
12. C corporation taxation can occur at two levels. The corporation may pay tax on its income, while shareholders may later pay tax on taxable dividends.
13. Partnership and S corporation tax items can retain their character as they pass through. Ordinary income, capital gains, deductions, and credits may receive different treatment.
14. Legal structure and tax classification are separate concepts. Limited liability does not itself determine federal tax treatment.
15. Pass-through taxation is one of the central organizing principles of U.S. business taxation.

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Frequently Asked Questions

What is pass-through taxation?

Pass-through taxation is a federal tax system in which qualifying business income, deductions, gains, losses, and other tax items generally pass from the business to its owners rather than being subject to the ordinary corporate income tax at the entity level. Partnerships and S corporations are major examples. (Legal Information Institute)

Which businesses are generally pass-through entities?

Partnerships and S corporations are the principal entity-level examples. Sole proprietorships are also generally taxed directly to the owner. Many LLCs receive pass-through treatment because they are classified as disregarded entities or partnerships, although an LLC can elect corporate treatment. (Internal Revenue Service)

Does a partnership pay federal income tax?

Generally, a partnership does not pay federal income tax on its ordinary business income. It files an information return and passes the relevant income, deductions, gains, losses, and credits through to its partners. (Internal Revenue Service)

Does an S corporation pay federal income tax?

Generally, an S corporation is not subject to the regular federal corporate income tax on its pass-through income. Its income, losses, deductions, and credits generally pass through to shareholders. However, certain S corporation-level taxes can apply in particular circumstances. (Internal Revenue Service)

Does a C corporation have pass-through taxation?

Generally, no. A C corporation is treated as a separate federal taxpayer. Its taxable income is generally taxed at the corporate level, and shareholders can face additional taxation when taxable dividends are distributed. (Internal Revenue Service)

Can a partner owe tax without receiving money from the partnership?

Yes. A partner generally reports the partner’s distributive share of partnership income whether or not the partnership actually distributes the corresponding cash. (Internal Revenue Service)

Can an S corporation shareholder owe tax without receiving a distribution?

Yes. S corporation income generally passes through to shareholders regardless of whether the corporation distributes an equivalent amount of cash.

What is a Schedule K-1?

Schedule K-1 reports a partner’s or S corporation shareholder’s share of relevant income, deductions, gains, losses, credits, and other tax items. The owner generally uses this information when preparing the owner’s federal tax return.

Is an LLC automatically taxed as a partnership?

No. A domestic LLC with two or more members is generally classified as a partnership for federal income-tax purposes unless it elects corporate treatment. A single-member LLC is generally disregarded for federal income-tax purposes unless it elects corporate treatment. (Internal Revenue Service)

Is an S corporation the same thing as an LLC?

No. An S corporation is a corporation that has elected a particular federal tax treatment. An LLC is a state-law business structure that may receive several different federal tax classifications.

An LLC can, if eligible, elect to be taxed as an S corporation.

Why are C corporations subject to double taxation?

A C corporation is generally a separate taxpayer. It pays federal income tax on its taxable income. If it subsequently distributes after-tax earnings to shareholders as taxable dividends, the shareholders may also owe tax on those dividends. (Internal Revenue Service)

Are partnership distributions taxable?

Not necessarily in the same way as partnership income. A partnership distribution and a partner’s allocated taxable income are separate tax concepts. The taxation of a distribution can depend on the partner’s basis and the applicable federal rules.

Are S corporation distributions taxable?

They can be, but the treatment depends on the shareholder’s stock basis and other applicable rules. A distribution may generally be tax-free to the extent it does not exceed the shareholder’s stock basis, subject to the statutory framework. (Internal Revenue Service)

Can a shareholder deduct an S corporation loss shown on a K-1?

Not automatically. The shareholder must generally satisfy basis requirements and then consider at-risk, passive activity, excess business loss, and other applicable limitations. (Internal Revenue Service)

What is the difference between a distributive share and a distribution?

A distributive share is generally the owner’s allocated share of the entity’s tax items. A distribution is generally cash or property transferred from the business to the owner. The two concepts are separate and can produce different tax consequences.

Why does basis matter?

Basis helps measure an owner’s tax investment in a partnership interest or S corporation stock. It can affect whether losses are deductible, whether distributions are taxable, and the gain or loss recognized when an ownership interest is disposed of.

Does pass-through taxation apply to state taxes?

Not necessarily in exactly the same way. This article concerns U.S. federal taxation. State and local tax systems can impose different rules, including entity-level taxes on businesses that receive pass-through treatment federally.

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Conclusion

Corporations, partnerships, and pass-through taxation represent three fundamental ways in which the U.S. federal tax system determines where business income is taxed.

A C corporation generally stands between the business activity and its owners for federal income-tax purposes. The corporation is itself a taxpayer. It calculates its taxable income, pays corporate income tax, and may subsequently distribute after-tax profits to shareholders, potentially creating another level of taxation.

A partnership operates differently. It generally does not pay federal income tax on its ordinary business income as an entity. Instead, its taxable income and other tax items are allocated among the partners and reported at the owner level.

An S corporation combines the corporate legal structure with a generally pass-through federal income-tax system. Its qualifying income, deductions, gains, losses, and credits generally pass through to shareholders, subject to the detailed rules of Subchapter S.

The distinction becomes even more important with LLCs. An LLC is a state-law structure, but its federal tax classification can vary. A single-member LLC may be disregarded for federal income-tax purposes; a multi-member LLC may generally be treated as a partnership; and an LLC can, when eligible, elect corporate or S corporation treatment.

The most important lesson is therefore not that one structure is universally better than another. It is that legal structure, federal tax classification, income allocation, distributions, basis, and owner-level taxation are separate concepts that must be understood together.

Pass-through taxation does not eliminate taxation. It changes the point at which the federal income-tax consequences are generally imposed. A partnership or S corporation may not pay the ordinary entity-level income tax imposed on a C corporation, but its owners can still owe substantial federal taxes on income that has passed through to them—even when the business has retained the cash.

That is why the phrase “pass-through taxation” describes much more than a filing technique. It describes one of the central architectural principles of U.S. federal business taxation: the business calculates and reports its economic activity, while the tax consequences of that activity may ultimately be carried by the people or entities that own the business.