The S corp vs C corp taxes comparison is often reduced to one sentence: “S corporations avoid double taxation.” 

That is true as a general description of federal tax treatment, but it is not enough to decide how a business should be structured. 

A C corporation generally pays federal income tax at the corporate level. When it distributes after-tax profits as dividends, shareholders can have a second federal tax liability on those dividends. An S corporation generally passes its income, deductions, gains, losses, and credits through to its shareholders, who report their shares on their individual returns.

But tax is only one part of the decision. 

The two structures also differ in who can own the company, how stock can be structured, how owner compensation is handled, how certain fringe benefits are treated, and how attractive the company may be to different types of investors. 

For 2026, there is another important piece of the picture: the federal Section 199A qualified business income deduction has been made permanent, and eligible owners of qualifying pass-through businesses may generally claim a deduction of up to 20% of qualified business income, subject to the applicable rules and limitations. C-corporation income is not eligible for this deduction.

The practical conclusion is not that one structure is universally better. 

It is that the tax result depends on how the business earns money, how profits are used, who owns it, how owners are compensated, and what the company plans to do with outside capital. 

S Corp vs C Corp Taxes at a Glance 

The table describes the federal framework. State corporate and individual taxes can change the result. 

How C Corporation Taxation Works 

A C corporation is a separate federal taxpayer. 

The corporation generally reports its taxable income on Form 1120 and pays federal corporate income tax. The current federal corporate tax rate is 21%. 

For example, suppose a C corporation has $100,000 of taxable income before federal corporate tax. 

At a 21% federal corporate tax rate, the corporation would have a federal corporate income-tax liability of: 

$100,000 × 21% = $21,000 

That leaves $79,000 after the federal corporate income tax, before considering other taxes and expenses. 

What happens next matters. 

If the corporation retains the $79,000 to fund expansion, there may not yet be a shareholder-level dividend tax on that retained amount. 

If the corporation later distributes the after-tax earnings as dividends, shareholders may owe personal federal tax on the dividends. 

The IRS explains that a C corporation’s profit is taxed when earned at the corporate level and can be taxed again when distributed to shareholders as dividends.

Is the 21% C-corp rate the owner’s total tax cost? 

No, The 21% rate applies to the corporation’s taxable income. It does not represent the shareholder’s complete tax cost. 

A shareholder receiving dividends may also owe personal federal income tax. 

For qualifying dividends, the federal individual tax rate can be 0%, 15%, or 20%, depending on the shareholder’s circumstances and the applicable rules. Certain high-income investors may also be subject to the 3.8% Net Investment Income Tax.  

State taxes can add another layer. 

So a simple comparison of: 

C corporation = 21% 

versus 

S corporation = owner’s individual rate 

does not describe the complete tax picture. 

What Does Double Taxation Mean for a C Corporation? 

“Double taxation” refers to two separate federal income-tax events involving the same corporate earnings. 

First: 

Corporation earns profit → corporation pays federal income tax. 

Then: 

Corporation distributes after-tax profit as a dividend → shareholder may pay federal income tax on the dividend. 

The corporation generally does not deduct dividends paid to its shareholders. 

Double taxation does not mean every dollar a C corporation earns is automatically taxed twice immediately. 

If earnings are retained in the corporation rather than distributed as dividends, the second shareholder-level dividend tax generally does not occur at that point. 

C corporations may therefore have reasons to retain and reinvest profits rather than distribute them. 

How S Corporation Pass-Through Taxation Works 

An S corporation generally does not pay regular federal corporate income tax on its operating income. 

Instead, the business passes income, losses, deductions, and credits through to shareholders. The shareholders report their allocated items on their own tax returns.

The corporation generally files Form 1120-S. 

Each shareholder receives a Schedule K-1 (Form 1120-S) showing that shareholder’s share of income, deductions, credits, and other items. 

The IRS explains that shareholders must generally include their share of S-corporation income on their tax returns whether or not the corporation actually distributes that income to them.

Example: K-1 income without a distribution 

Suppose an S corporation earns $100,000 of taxable business income. 

A 50% shareholder may receive a K-1 showing $50,000 of applicable income. 

The shareholder generally reports that $50,000 on the individual tax return even if the corporation keeps the money in its bank account to fund future operations. 

This is sometimes called phantom income because the taxpayer can owe income tax on income that was not distributed in cash. 

The actual tax treatment depends on the shareholder’s circumstances and the character of the income. 

Do S Corp Shareholders Pay Tax if Profits Stay in the Business? 

Generally, yes. S corporation income generally flows through to shareholders whether or not cash is distributed. 

That is one of the biggest differences between an S corporation and a C corporation. 

This also means an S corporation should think carefully about cash distributions. 

A company may have enough cash to operate but not enough cash to cover both: 

• the shareholder’s individual tax obligations on pass-through income, and 
• the business’s working-capital needs. 

The corporation’s tax reporting and the shareholder’s cash-distribution policy therefore need to be coordinated. 

Are S Corporation Distributions Tax-Free? 

Not automatically. An S corporation distribution is not simply another name for a K-1. 

The K-1 tells the shareholder about the shareholder’s allocated tax items. 

A distribution is a separate transaction that can affect the shareholder’s stock basis and can have different tax consequences depending on the shareholder’s basis and the corporation’s tax attributes. 

The IRS says S-corporation shareholders must track their stock and debt basis, and basis limitations can affect whether losses and deductions are currently allowable.

This is one reason an owner should not simply withdraw money and assume it is tax-free because the company already reported income on a K-1. 

Does an S Corporation Pay Self-Employment Tax? 

S corporation pass-through income generally is not treated as self-employment income. 

However, an owner who works for the S corporation can be an employee, and wages paid for those services are subject to employment taxes.

This is where owner compensation becomes important. 

S Corporation Owner Compensation: Salary vs. Distributions 

An S corporation shareholder who performs services for the corporation generally cannot simply label all payments as distributions. 

The IRS says an S corporation must pay reasonable compensation to a shareholder-employee for services provided before non-wage distributions are made. 

Relevant factors can include: 

• Training and experience 
• Duties and responsibilities 
• Time and effort 
• Compensation paid to other employees 
• Comparable compensation 
• Compensation agreements 
• The source of corporate revenue 

Why this matters 

Suppose an owner actively operates the company and takes a very small salary while withdrawing substantial amounts as distributions. 

The IRS can examine whether the salary appropriately reflects the services provided. The agency has authority to reclassify amounts treated as distributions as wages when they represent compensation for services.  

There is no universal IRS formula such as “pay yourself 40% of profit.” 

Reasonable compensation is a facts-and-circumstances determination. 

How C Corporation Owner Compensation Works 

A shareholder who works for a C corporation can generally receive wages as an employee. 

The corporation can generally deduct ordinary and necessary compensation expenses, subject to the applicable tax rules. 

The shareholder reports the wages as employment income. 

Unlike S corporations, C corporations do not have the same S-corporation distinction between shareholder distributions and reasonable compensation. 

A C corporation can also pay dividends when appropriate. 

That gives the C corporation two distinct common ways of returning value to an owner: 

Compensation for services 

and 

Dividends as a shareholder 

Each has different tax consequences. 

S Corp Pass-Through Taxation and the QBI Deduction 

Another important difference in S corp vs C corp taxes is the potential Qualified Business Income (QBI) deduction. 

The 2025 tax rules allowed eligible owners of S corporations and other pass-through businesses to potentially deduct up to 20% of qualified business income, subject to statutory limitations. 

For 2026 and later tax years, the 2025 tax legislation made the QBI deduction permanent for qualifying active trades or businesses.

The deduction is taken at the shareholder level. 

An S corporation itself does not take the QBI deduction. Instead, the corporation provides shareholders with the information needed to calculate their individual deduction.

Does every S corporation shareholder get a 20% deduction? 

No, the phrase “20% QBI deduction” describes the potential maximum calculation, not a guaranteed deduction. 

The deduction is subject to limitations involving factors such as: 

• Taxable income 
• Type of business 
• W-2 wages 
• Qualified property 
• Specified service trade or business rules 
• Other statutory limitations 

Does C corporation income qualify for QBI? 

Generally, no. Income earned through a C corporation does not qualify as QBI for the Section 199A deduction.

That can be an important modeling consideration, but it should not be treated as proof that an S corporation will produce lower overall tax. 

S Corporation Ownership Restrictions 

S corporations have more restrictive ownership rules than C corporations. 

To qualify for S corporation treatment, a corporation generally must: 

• Be a domestic corporation 
• Have no more than 100 shareholders 
• Have only allowable shareholders 
• Have only one class of stock 
• Avoid certain categories of ineligible corporations 

Permitted shareholders can include individuals, certain trusts, estates, and certain tax-exempt organizations. 

A partnership, corporation, and nonresident alien generally cannot be an S corporation shareholder.  

Can a non-U.S. citizen own an S corporation? 

It depends on the person’s U.S. tax status. 

A nonresident alien generally cannot own S corporation stock. 

That is different from saying that every foreign-born or non-U.S.-citizen person is prohibited. 

A U.S. resident alien may qualify as an eligible individual shareholder, while a nonresident alien does not.

When ownership involves a person living outside the United States, immigration status and U.S. tax-residency status should be distinguished before making the S election. 

Can an S Corporation Have Voting and Nonvoting Shares? 

Yes, potentially. The rule is often summarized incorrectly as “S corporations can have only one class of stock, so they cannot have voting and nonvoting shares.” 

The IRS rules provide more nuance. 

Differences in voting rights alone generally do not create a second class of stock. 

The key requirement is that shares have identical rights to distributions and liquidation proceeds.

So an S corporation can potentially issue voting and nonvoting shares while maintaining one class of stock for federal tax purposes, provided the economic rights meet the applicable requirements. 

This can provide some flexibility, but it is considerably different from the broad stock-structuring flexibility available to a C corporation. 

S Corp vs C Corp for Investors 

For investors, the ownership restrictions can be more important than the headline tax rate. 

C corporations offer broader investor flexibility 

A C corporation generally can accommodate: 

• A larger number of shareholders 
• Corporate shareholders 
• Partnership investors 
• Foreign investors 
• Multiple classes of stock 
• Preferred stock 
• More complex capitalization structures 

That flexibility is one reason C corporations are commonly used by companies expecting institutional investment, multiple investment rounds, or complex equity arrangements. 

Stripe’s current U.S. business-formation guidance similarly identifies C corporations as the conventional structure for companies seeking venture capital, institutional investment, multiple share classes, and international investors.

S corporations have tighter constraints 

An S corporation’s investor pool is restricted by: 

• 100-shareholder limit 
• Shareholder eligibility rules 
• One-class-of-stock rules 

An investor who is a partnership, corporation, or nonresident alien generally cannot own S corporation stock.

That does not mean an S corporation cannot raise outside capital. 

It means the type of investor and structure of the investment must fit the S-corporation rules. 

S Corp vs C Corp Fringe Benefits 

Fringe benefits are another area where older comparison articles can oversimplify the rules. 

The federal tax treatment of benefits can depend on: 

• Whether the recipient is an employee 
• Ownership percentage 
• Type of benefit 
• Whether the benefit plan meets applicable nondiscrimination requirements 
• Whether the shareholder is a greater-than-2% S corporation shareholder 

Health insurance for S corporation shareholders 

A shareholder who owns more than 2% of an S corporation is subject to special federal tax rules for employer-provided health benefits. 

The IRS says health insurance benefits paid on behalf of a more-than-2% shareholder generally must be included in the shareholder’s wages for federal income-tax withholding purposes, although different rules apply to Social Security, Medicare, and FUTA taxation.

The shareholder may potentially qualify for the self-employed health insurance deduction if the applicable requirements are satisfied.

C corporation employee benefits 

C corporations generally do not have the same special greater-than-2% shareholder rule that applies to S corporations. 

For ordinary employees, qualifying employer-paid health coverage is generally excluded from wages under the applicable rules.

Other fringe benefits also have their own eligibility and nondiscrimination rules. 

The important point is not that “C corp benefits are tax-free.” 

It is that S-corporation shareholder-employees can fall under special benefit rules that do not apply in the same way to ordinary employees or C-corporation shareholders. 

S Corp Schedule K-1: What Owners Need to Know 

The S corp Schedule K-1 tells each shareholder what share of the corporation’s income, deductions, credits, and other tax items belongs to that shareholder. 

The corporation prepares Form 1120-S and issues a K-1 to each shareholder.

A K-1 is not a paycheck. 

It is a tax-reporting document. 

For example, a shareholder might receive: 

$70,000 of W-2 wages 

and 

$30,000 of S corporation income on Schedule K-1 

Those amounts are reported differently and have different tax treatment. 

The shareholder should also maintain records of stock and debt basis because basis can affect the deductibility of losses and the tax treatment of certain distributions.

Which Forms Do S Corps and C Corps File? 

The two entities file different federal income-tax returns. 

S corporation 

An S corporation generally files: 

Form 1120-S — U.S. Income Tax Return for an S Corporation 

Each shareholder generally receives: 

Schedule K-1 (Form 1120-S) 

The shareholder reports the applicable amounts on the individual return.

C corporation 

A C corporation generally files: 

Form 1120 — U.S. Corporation Income Tax Return 

The corporation pays its federal corporate income tax through that return. 

Shareholder dividends are separately reported to shareholders, generally on Form 1099-DIV, when applicable. 

C and S corporations can also have separate payroll, information-return, excise-tax, and other filing obligations. 

Can an LLC Elect S Corporation Taxation? 

Yes, an eligible LLC can elect S corporation taxation for federal tax purposes. 

An LLC is a legal structure created under state law. Its federal tax classification can be different from its state-law legal form. 

The IRS explains that an eligible LLC classified as a corporation can elect S corporation treatment by filing Form 2553.

This creates an important distinction: 

LLC describes the legal entity. 

S corporation can describe the federal tax classification. 

An LLC can therefore remain an LLC under state law while being taxed as an S corporation for federal purposes. 

Switching From C Corp to S Corp 

A C corporation that wants S corporation treatment generally makes an S election by filing Form 2553 and meeting the S-corporation eligibility requirements. 

For a calendar-year corporation seeking an election effective January 1, the normal deadline is generally 2 months and 15 days after the beginning of the tax year, or at any time during the preceding tax year.

Late-election relief may be available in qualifying circumstances. 

Switching does not necessarily mean “no tax consequences” 

A C corporation that becomes an S corporation can carry historical tax attributes and assets into its S-corporation period. 

One important issue is the built-in gains tax. 

The IRS says an S corporation that was formerly a C corporation can be subject to the built-in gains tax when it recognizes built-in gain during the applicable five-year recognition period.

For example, suppose a C corporation owns property that is worth substantially more than its tax basis on the date its S election takes effect. 

A later sale of that property within the recognition period can create a built-in-gains tax issue. 

That makes a C-to-S conversion a transaction that should be modeled before the election is filed. 

What about switching the other direction? 

An S corporation can revoke its S election and return to C-corporation tax treatment, but the consequences can be significant. 

The IRS notes that after an S election is terminated, another S election generally requires IRS consent for a period extending through the fifth tax year after the first year of termination, subject to the applicable rules.

The decision should therefore not be treated as a simple annual preference. 

How State Taxes Affect the S Corp vs C Corp Comparison 

Federal tax treatment does not tell the whole story. 

States can have their own rules concerning: 

• S corporation recognition 
• Corporate income tax 
• Franchise taxes 
• Entity-level taxes 
• Shareholder income 
• Apportionment 
• Filing requirements 
• State elections 

A state may follow the federal S election, partially conform to it, impose an entity-level tax, or use other rules. 

Therefore, a federal S-corp calculation should not be presented as the final tax comparison for a multistate business. 

For businesses operating in more than one state, review both the corporation’s state filings and the owners’ state personal returns. 

How to Compare S Corp and C Corp Taxes Properly 

Avoid comparing only statutory tax rates. 

Build a side-by-side model using the business’s actual expected numbers. 

Example framework 

Suppose a business expects: 

$500,000 revenue 

$350,000 deductible operating expenses 

$150,000 business income before owner compensation and applicable taxes 

Then model: 

S corporation 

• Reasonable shareholder compensation 
• Employer payroll taxes 
• Remaining S-corporation income 
• Shareholder K-1 
• Potential QBI deduction 
• Personal income tax 
• State taxes 

C corporation 

• Owner salary 
• Employer payroll taxes 
• Corporate taxable income 
• 21% federal corporate tax 
• Cash retained in corporation 
• Potential dividends 
• Shareholder dividend tax 
• State taxes 

The result can be materially different depending on how much profit is distributed versus retained and the owner’s individual tax situation. 

That is why statements such as: 

“S corporations always save taxes.” 

or 

“C corporations only pay 21%.” 

are incomplete. 

What Information Should You Bring to an Accountant Before Choosing? 

An accountant will need more than your annual revenue figure. 

Bring: 

Business information 

• Legal entity type 
• State of formation 
• States where business operates 
• Ownership percentages 
• Number of owners 
• Current tax classification 

Financial information 

• Profit and loss statement 
• Balance sheet 
• Cash balances 
• Debt 
• Accounts receivable 
• Accounts payable 
• Fixed assets 

Owner information 

• Current salary 
• Distributions 
• Benefits 
• Ownership basis 
• Other personal income 
• Filing status 

Growth plans 

• Expected hiring 
• Expansion into other states 
• Planned investors 
• Possible sale 
• Retained earnings strategy 
• Stock-option or equity plans 

Tax records 

• Prior federal returns 
• State returns 
• Payroll returns 
• Schedule K-1s 
• Estimated tax payments 
• Prior S-election documents 

Accounts Confidant’s bookkeeping for tax preparation guide explains why reconciled books and organized year-end records make tax preparation easier. 

For businesses comparing entity structures, clean financial statements also make it easier to model the tax consequences using actual numbers instead of estimates. 

Common Mistakes When Comparing S Corp and C Corp Taxes 

Comparing 21% with an individual tax bracket 

The 21% C-corporation rate applies at the corporate level. 

It does not automatically represent the shareholder’s final tax burden. 

Assuming every S-corp distribution is tax-free 

Distributions depend on shareholder basis and other tax attributes. 

Treating K-1 income as cash received 

You can owe tax on S-corporation income even when the cash remains in the company. 

Ignoring reasonable compensation 

An S-corporation shareholder who performs services generally needs appropriate wage treatment before taking non-wage distributions.

Assuming every LLC should elect S taxation 

The tax election should be evaluated against compensation, distributions, QBI, state taxes, ownership, administrative requirements, and long-term plans. 

Ignoring investor requirements 

A company planning to bring in institutional or foreign investors may find the S-corporation ownership restrictions important. 

Ignoring state taxes 

Federal calculations alone can produce an incomplete comparison. 

Final Takeaway 

The S corp vs C corp taxes decision should not be based on a single tax rate. 

An S corporation generally provides federal pass-through taxation, while a C corporation generally pays federal income tax at the corporate level and may create a second shareholder-level tax when profits are distributed as dividends.

For 2026, eligible owners of S corporations can also potentially benefit from the permanent Section 199A qualified business income deduction, subject to its limitations. C-corporation income does not qualify for that deduction. 

At the same time, C corporations generally have substantially more flexibility for ownership, foreign investors, multiple classes of stock, and institutional financing. S corporations have tighter eligibility requirements but can provide a different federal tax structure for qualifying privately held businesses.

The right comparison therefore looks at the entire situation: 

taxes + compensation + distributions + benefits + ownership + investors + state rules + long-term plans 

Before changing an existing entity’s tax classification, model the consequences using actual financial statements and ownership information. A C-to-S conversion can create tax issues, including a potential built-in gains tax during the five-year recognition period. 

Accounts Confidant provides bookkeeping, reconciliation, payroll processing, financial reporting, and tax-preparation support to help businesses maintain the financial records needed for entity-level tax planning. 

Frequently Asked Questions