Most business owners think choosing between a C Corp and an S Corp is a paperwork decision. It is not. The difference between a C Corp and an S Corp is the single structural choice that decides whether your profits get taxed once or twice, whether you can pull money out tax-efficiently, and whether you qualify for the deductions that save owners five figures a year. Pick wrong and you can hand the IRS thousands of dollars you never needed to pay.

Here is the twist most accountants bury in jargon: these are not two different types of companies. They are two different tax elections sitting on top of the same corporation. Understanding that distinction is where the real savings begin.

Quick Answer: The Difference Between a C Corp and an S Corp

A C Corp is taxed as its own entity. It pays corporate income tax on profits, and then shareholders pay tax again on any dividends they receive. That is double taxation. An S Corp passes its profits straight through to the owners’ personal returns, so the income is taxed only once. For most small and mid-size business owners, the S Corp election saves money. For high-growth companies that reinvest profits or plan to raise outside capital, the C Corp can win. The right answer depends on your profit level, how you take money out, and your long-term plans.

What a C Corp Actually Is (In Plain English)

A C Corporation is the default tax status the IRS assigns to any corporation when it is formed. The “C” refers to Subchapter C of the Internal Revenue Code. When people talk about Apple, Microsoft, or any publicly traded company, they are talking about C Corps.

The defining feature is that the corporation is a completely separate taxpayer. It files its own return (Form 1120) and pays a flat 21 percent federal corporate tax rate on its profits. That rate has been locked at 21 percent since the Tax Cuts and Jobs Act took effect, and it remains in place for the 2025 and 2026 tax years.

The Double Taxation Problem

Here is where owners get burned. Say your C Corp earns $200,000 in profit. The corporation pays 21 percent, or $42,000, in federal tax. That leaves $158,000. Now you want that money in your pocket, so the corporation pays it out as a dividend. You then pay personal tax on that dividend, often at the 15 or 20 percent qualified dividend rate, plus the 3.8 percent net investment income tax if your income is high enough.

On that $158,000 dividend at a 20 percent rate, you lose another $31,600. Your total tax bill on the original $200,000 climbs past $73,000. The money got taxed on the way into the company and again on the way out. That is the cost of the C Corp structure when you need to distribute profits to yourself.

When the C Corp Still Makes Sense

Double taxation only bites when you pull money out. If you are reinvesting profits to grow, hiring, buying equipment, or building toward a sale or an outside investment round, the C Corp has real advantages. Venture capital firms and most serious investors require a C Corp. The flat 21 percent rate can also beat the top personal rates for owners who leave money in the business. For founders chasing scale, the business owners who benefit most from a C Corp are usually the ones who are not living off the company’s profits yet.

Key Takeaway: A C Corp pays a flat 21 percent and is ideal for reinvesting profits or raising capital, but any money distributed to owners gets taxed a second time.

What an S Corp Actually Is

An S Corporation is not a different company. It is a tax election. You form a corporation (or an LLC), then file Form 2553 with the IRS to be taxed under Subchapter S. Once that election is accepted, the business stops paying corporate income tax entirely.

Instead, profits and losses flow through to the owners’ personal tax returns, reported on Schedule K-1. The business files an informational return (Form 1120-S), but the tax is paid only once, at the individual level. No double taxation. This is why the S Corp is the workhorse election for profitable small businesses across the country.

The Salary and Distribution Split That Saves Thousands

The single biggest reason owners elect S Corp status is the self-employment tax savings. In a standard LLC or sole proprietorship, every dollar of net profit is hit with 15.3 percent self-employment tax (Social Security and Medicare) on top of income tax. An S Corp changes the math.

As an S Corp owner, you pay yourself a reasonable salary, which is subject to payroll taxes. The remaining profit comes out as a distribution, which is not subject to the 15.3 percent self-employment tax. That gap is where the savings live.

• Example: Maria runs a marketing consultancy netting $150,000. As a sole proprietor, she pays roughly $21,000 in self-employment tax.
• After electing S Corp status, she pays herself a reasonable salary of $80,000 and takes $70,000 as a distribution.
• Payroll taxes apply only to the $80,000, cutting her self-employment-style tax to about $12,240.
• That is a savings of nearly $8,800 in a single year, before accounting for the modest cost of running payroll.

The key phrase the IRS cares about is “reasonable compensation.” You cannot pay yourself a $10,000 salary and take $140,000 as a distribution. The IRS expects the salary to reflect what the role would pay in the open market. Set it too low and you invite an audit. For a deeper look at how to structure this correctly, our team walks owners through the entire process with tax planning services built around their specific numbers.

If you want to see roughly how the salary-versus-distribution split affects your own numbers, run them through a small business tax calculator before you make the election.

C Corp vs S Corp: Side-by-Side Comparison

Seeing the differences laid out together makes the decision clearer. Here is how the two elections stack up on the factors that matter most.

KDA Case Study: LLC Owner Saves Big With an S Corp Election

David owns a profitable residential HVAC business organized as a single-member LLC. By 2024 his net profit had climbed to $185,000, and he was taking all of it as ordinary self-employment income. His prior accountant simply filed his Schedule C each year and never raised the question of entity structure. The result was a self-employment tax bill north of $26,000 annually, on top of his regular income tax.

When David came to KDA, the first thing our team did was model the difference between his current setup and an S Corp election. We determined that a reasonable salary for an owner-operator in his trade and region was $95,000. The remaining $90,000 could be taken as a distribution not subject to self-employment tax. We filed Form 2553 to make the election effective for the following tax year, set up a compliant payroll system so his salary was documented properly, and built a quarterly plan to keep his reasonable compensation defensible.

The outcome: David cut his self-employment-style tax burden by roughly $12,600 in the first year. He paid KDA $3,500 for the restructuring, planning, and payroll setup, which translates to about a 3.6x first-year return on his investment. More importantly, that savings now repeats every year he stays profitable, and his compensation is documented well enough to survive IRS scrutiny.

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.

Which One Should You Choose?

The decision comes down to how you use your profits and where you want the business to go. Use these criteria to narrow it down.

Choose an S Corp if:

• Your business profit exceeds roughly $50,000 to $60,000 per year
• You take most of the profit out as personal income
• You can justify and document a reasonable salary
• You are willing to run formal payroll
• Your owners are all U.S. individuals (100 or fewer)

Choose a C Corp if:

• You plan to reinvest most profits back into growth
• You want to raise money from venture capital or outside investors
• You need multiple classes of stock
• You have foreign owners or more than 100 shareholders
• You want to offer a broad menu of tax-free fringe benefits

For a complete breakdown of how the S Corp election fits into a broader plan, see our complete guide to S Corp tax strategy.

Why Most Owners Miss This Decision Entirely

The most common mistake is simply never revisiting entity structure. Owners form an LLC on day one when they have no profit, and then years later they are netting six figures as a sole proprietor, bleeding self-employment tax the whole time. Nobody flags it because basic tax preparation only looks backward at what already happened, not forward at what could be structured better.

Another trap is electing S Corp status and then paying an unreasonably low salary to dodge payroll taxes. The IRS has flagged this for years. In contested cases, courts have reclassified distributions as wages and assessed back payroll taxes plus penalties. The fix is straightforward: pay a market-rate salary, document how you arrived at it, and take the distribution on top. This is a solvable problem, not a reason to avoid the election.

What Is a Reasonable Salary for an S Corp Owner?

A reasonable salary is what you would have to pay someone else to do your job in the open market. The IRS looks at your role, your experience, hours worked, what comparable positions pay in your region, and how much of the business’s income is driven by your personal effort versus capital or employees.

There is no fixed percentage in the tax code, despite what you may read online. A rough industry rule of thumb is that salary should represent a meaningful share of total compensation, often 40 to 60 percent, but the real test is market comparability. Document your reasoning in writing each year so you have a defensible record if questions ever arise.

Can I Switch From a C Corp to an S Corp Later?

Yes. A C Corp can elect S status by filing Form 2553, generally by the 15th day of the third month of the tax year in which you want the election to take effect. Switching the other way, from S back to C, is also possible by revoking the election, though once you revoke you generally cannot re-elect S status for five years without IRS consent.

Be aware of the built-in gains tax if you convert from C to S while holding appreciated assets. Selling those assets within five years of the conversion can trigger a corporate-level tax. This is a situation where professional guidance pays for itself, because the timing of the switch can save or cost you real money.

Do I Need to Run Payroll for an S Corp?

Yes, and this is non-negotiable. The salary portion of your S Corp income must go through formal payroll, with federal and state withholding, Social Security, and Medicare taxes, plus the quarterly Form 941 filings and annual W-2. Skipping payroll is one of the fastest ways to lose the S Corp’s audit protection. The cost of a payroll service is modest and far outweighed by the tax savings and the compliance peace of mind it provides.

Frequently Asked Questions

Is an S Corp always cheaper than a C Corp?

No. For owners who take profits out as income, the S Corp usually wins because it avoids double taxation and reduces self-employment tax. But for businesses reinvesting heavily or raising outside capital, the flat 21 percent C Corp rate and investor-friendly structure can come out ahead. The right answer depends on your numbers.

Can an LLC be taxed as an S Corp or C Corp?

Yes. An LLC is a legal structure, not a tax status. By default it is taxed as a sole proprietorship or partnership, but it can elect to be taxed as an S Corp by filing Form 2553, or as a C Corp by filing Form 8832. This lets you keep the LLC’s legal simplicity while gaining the tax advantages of a corporate election.

What happens if I pick the wrong structure?

The good news is that most structures can be changed. The bad news is that the wrong choice can cost thousands per year while you have it, and some switches carry restrictions like the five-year re-election rule or built-in gains tax. The smart move is to model the options before you commit and revisit the decision as your profit grows.

Book Your Entity Strategy Session

If you are running a profitable LLC or sole proprietorship and have never modeled what an S Corp election would save you, there is a strong chance you are overpaying the IRS every single quarter. We will run your exact numbers, identify a defensible reasonable salary, and show you the first-year and long-term savings in plain dollars. Click here to book your consultation now.

This information is current as of 10/8/2026. Tax laws change frequently. Verify updates with the IRS or FTB if reading this later.