Most business owners think the choice between a C Corp and an S Corp is a legal technicality their attorney handles once and forgets. That assumption quietly costs thousands of dollars every single year. The real difference between these two structures lives entirely in how they are taxed, and the wrong pick can double-tax your profits or leave easy savings on the table. This c corp and s corp taxation breakdown cuts through the confusion so you can see exactly where your money goes under each structure, and which one fits your income level, your goals, and your exit plan.

Quick Answer: The C Corp and S Corp Taxation Breakdown in Plain English

A C Corp pays a flat 21% federal corporate tax on its profits, and then owners pay tax again on any dividends they take. That is double taxation. An S Corp pays no entity-level federal income tax at all. Instead, profits “pass through” to the owner’s personal return and are taxed once. For most small and mid-sized profitable businesses, the S Corp wins. But for companies reinvesting heavily or planning to raise venture capital, the C Corp can pull ahead. The right answer depends on your numbers, not on a rule of thumb.

This information is current as of 10/9/2026. Tax laws change frequently. Verify updates with the IRS or FTB if reading this later.

How C Corp Taxation Actually Works

A C Corporation is the default corporate structure. When you file Articles of Incorporation and do nothing else, the IRS treats you as a C Corp. Here is the mechanic that trips people up: the corporation is its own taxpayer. It files Form 1120 and pays a flat 21% federal tax on net profits.

That is only the first layer. When the corporation distributes profits to you as a shareholder through dividends, you pay tax again on your personal return, usually at the qualified dividend rate of 15% or 20% depending on your income. This is the double taxation everyone warns about.

A Real Dollar Example of C Corp Double Taxation

Say your C Corp earns $200,000 in profit. The corporation pays 21%, which is $42,000, leaving $158,000. You then pull that out as a dividend. At the 15% qualified dividend rate, you owe another $23,700. Your total tax bill is $65,700 on $200,000 of profit, an effective rate of nearly 33% before any state tax is layered on.

In California, the numbers get worse. The state charges an 8.84% corporate franchise tax on top of the federal 21%, and California does not give dividends special treatment at the state level. High-income California business owners often see combined effective rates push past 45% when both layers hit.

When the C Corp Still Makes Sense

Double taxation only bites when you take money out. If you are reinvesting every dollar back into the business to fund growth, hire staff, or buy equipment, the second layer never triggers. That flat 21% can be attractive for capital-intensive companies. C Corps also unlock benefits S Corps cannot touch: unlimited shareholders, multiple stock classes, foreign owners, and the ability to attract venture capital. Startups chasing institutional funding almost always need to be C Corps.

Key Takeaway: A C Corp makes sense when you reinvest profits, plan to raise outside capital, or want to offer stock options to employees. The 21% flat rate rewards growth, not distribution.

How S Corp Taxation Changes the Math

An S Corporation is not a separate kind of company. It is a tax election you make on an existing LLC or corporation by filing Form 2553 with the IRS. The magic is that the S Corp pays zero federal income tax at the entity level. Profits flow through to your personal return on a Schedule K-1 and are taxed once.

Running the same $200,000 profit through an S Corp: instead of paying 21% then another layer on dividends, that $200,000 lands on your personal return. If you are in the 24% bracket, you pay roughly $48,000, and you keep the rest. You skip the second layer entirely. That is a meaningful swing from the C Corp’s $65,700 bill.

Business owners weighing these structures should understand that the S Corp election is where most of the strategic planning happens, and it is a core focus for business owners who want to keep more of what they earn. For a deeper strategic walkthrough, our complete guide to S Corp tax strategy in California covers the advanced moves in detail.

The Reasonable Salary Rule You Cannot Ignore

The S Corp also unlocks a self-employment tax savings strategy that the C Corp does not. As an S Corp owner who works in the business, you must pay yourself a “reasonable salary” through payroll. That salary is subject to the 15.3% payroll tax. But any profit above your salary can be taken as a distribution, which is NOT subject to self-employment tax.

Here is the catch the IRS watches closely: your salary must actually be reasonable for the work you do. Pay yourself $20,000 and distribute $180,000, and you are inviting an audit. According to IRS guidance on S Corporation officers, shareholder-employees must receive reasonable compensation before non-wage distributions.

How to Set a Defensible Salary

• Research comparable wages for your role, industry, and region using sources like the Bureau of Labor Statistics.
• Document your reasoning in writing and keep it with your corporate records.
• Use the 60/40 guideline as a starting point, not a hard rule. Many strategists suggest roughly 60% salary and 40% distribution for owner-operators, then adjust to your facts.
• Revisit the number annually as your profit and role evolve.

C Corp vs S Corp: Side by Side Comparison

This table captures the heart of the c corp and s corp taxation breakdown. The S Corp shines for owner-operators who take profits home. The C Corp shines for companies building toward scale and outside investment.

KDA Case Study: Consulting LLC Owner Cuts Tax Bill with S Corp Election

Marcus, a management consultant in Sacramento, ran his practice as a single-member LLC earning $165,000 in annual net profit. As a default LLC, every dollar of that profit was subject to self-employment tax at 15.3%, costing him roughly $23,300 in payroll taxes alone, on top of his income tax. He came to KDA convinced he was “just a small business” and that entity planning was for bigger companies.

After reviewing his numbers, our team elected S Corp status for his LLC by filing Form 2553. We set a reasonable salary of $95,000 based on consulting wage data for his market and experience, and took the remaining $70,000 as a distribution. That distribution escaped the 15.3% self-employment tax entirely, saving him about $10,700 in the first year. We also restructured his retirement contributions to stack additional deductions on top.

Marcus paid KDA $3,600 for the planning, election, and payroll setup. His first-year tax savings came to roughly $10,700, a return of nearly 3x on his investment, and those savings now repeat every year he stays profitable. The structure that he assumed was “for bigger companies” turned out to be the single highest-ROI decision in his business.

Ready to see how we can help you? Explore more success stories on our case studies page to discover proven strategies that have saved our clients thousands in taxes.

Why Most Business Owners Miss This Tax Savings

The biggest mistake is defaulting into a C Corp by accident, or staying as a plain LLC long after the profits justify an S Corp election. Many owners never make the switch because they fear the payroll paperwork or assume the savings are small. Both assumptions are usually wrong.

Another common trap is electing S Corp status but then setting an unreasonably low salary to dodge payroll tax. This is the single fastest way to attract IRS scrutiny. The fix is simple: document a defensible salary and pay it consistently through formal payroll. A well-run tax planning process catches both of these errors before they cost you money or trigger a notice.

Want to run your own numbers before deciding? Plug your business profit into this small business tax calculator to estimate your liability under different scenarios.

Should You Switch From C Corp to S Corp?

Yes, if:

• Your business is profitable and you take money out regularly
• You are an owner-operator actively working in the business
• Your profit exceeds your reasonable salary by a meaningful margin
• You have 100 or fewer shareholders, all US persons

No, if:

• You plan to raise venture capital or go public
• You reinvest nearly all profit back into growth
• You need multiple stock classes or foreign ownership
• Your profit barely exceeds a reasonable salary

What If I Already Formed a C Corp?

You are not stuck. An existing C Corp can elect S Corp status by filing Form 2553, generally within two months and 15 days of the start of the tax year you want the election to take effect, or anytime in the prior year. Be aware of the built-in gains tax, which can apply if your C Corp holds appreciated assets when it converts. This is a situation where professional guidance pays for itself, because the timing and asset mix determine whether the switch saves or costs you money.

How Do I Know Which Structure Fits My Income Level?

As a rough guide: businesses with net profit under $40,000 often see minimal benefit from an S Corp because payroll costs eat into the savings. Between $50,000 and $500,000 of profit, the S Corp usually produces clear self-employment tax savings for owner-operators. Above that, or when you are building toward a sale or raise, the C Corp’s flat rate and capital-friendly structure deserve a serious look. Your personal bracket, state, and growth plans all shift the break-even point.

Frequently Asked Questions

Can an LLC be taxed as an S Corp?

Yes. An LLC is a legal structure, and S Corp is a tax election. You keep your LLC and file Form 2553 to be taxed as an S Corp. This is one of the most common and powerful planning moves for profitable small businesses.

Does an S Corp pay any California tax?

Yes. California charges S Corps a 1.5% franchise tax on net income, with an $800 annual minimum. That is far lighter than the 8.84% C Corp rate, but it is not zero. Factor it into your comparison.

How often can I change my election?

Once you revoke an S Corp election, the IRS generally will not let you re-elect for five years without special permission. Treat the decision as a long-term commitment, not something to flip every year.

Will an S Corp election increase my audit risk?

Not by itself. What draws attention is an unreasonably low owner salary paired with large distributions. Pay yourself fairly, document it, and you remove the main red flag.

Book Your Entity Strategy Session

If you are running profits through the wrong structure, you could be handing the IRS thousands of dollars you never needed to pay. Let’s find out which entity actually keeps more money in your pocket and build the election, salary, and payroll setup to back it up. Book a personalized consultation with our strategy team and walk away knowing your exact tax savings. Click here to book your consultation now.

The IRS is not hiding these savings from you. Your business structure just was not built to find them.