Most people who form a corporation pick the wrong tax treatment and never find out until a CPA hands them a bill. They walk into an online filing portal, click “Incorporate,” and assume the letters after their business name sort themselves out. They do not. When you inc a S Corp and C Corp, you are choosing between two completely different tax regimes that can swing your yearly tax bill by five figures on the exact same profit. The incorporation paperwork is identical. The tax outcome is anything but.

Here is the part nobody explains at the point of sale: “incorporating” and “electing a tax status” are two separate acts. You form a legal corporation with your state first. Then you tell the IRS how you want that corporation taxed. Skip the second step and the IRS defaults you to C Corp treatment, which is rarely the cheapest option for a small, profitable business.

Quick Answer: What Happens When You Inc a S Corp and C Corp

When you incorporate, you create one legal entity. That entity is taxed as a C Corporation by default. To be taxed as an S Corporation instead, you file Form 2553 with the IRS. A C Corp pays its own 21% federal tax, then shareholders pay tax again on dividends (double taxation). An S Corp passes profit straight to your personal return, taxed once, and can slash self-employment tax by splitting income into salary and distributions. For most owners earning $75,000 to $400,000 in profit, the S Corp wins. For businesses reinvesting heavily or seeking outside investors, the C Corp can win.

That is the summary. The dollars are in the details, so let’s walk through exactly how each structure is taxed, who should pick which, and the mistakes that quietly cost owners thousands every April.

The Legal Shell vs the Tax Election: Two Decisions, Not One

The word “incorporate” only describes forming the legal shell. When you file Articles of Incorporation with your Secretary of State, you create a corporation. That corporation is a separate legal person. It can sign contracts, hold assets, and shield your personal property from business lawsuits. That liability protection is identical whether the corporation is later taxed as an S Corp or a C Corp.

The tax election is the second, separate decision. The IRS treats your new corporation as a C Corp automatically unless you file an election to be treated as an S Corp. “S” and “C” simply refer to the subchapters of the Internal Revenue Code that govern each tax treatment. Subchapter C is the default corporate tax rulebook. Subchapter S is the elective pass-through rulebook.

Why This Confuses So Many Owners

Online formation services blur the line on purpose. They sell you “LLC vs Inc” as if that is the whole decision, then upsell an “S Corp election” as an add-on. The reality is cleaner than their menu suggests:

• Entity type (LLC or corporation) decides your legal structure and paperwork.
• Tax election (default, S Corp, or C Corp) decides how the IRS taxes your profit.
• An LLC can even elect S Corp or C Corp tax treatment without changing its legal form.

So when you hear a business owner say “I incorporated,” ask the follow-up: how is it taxed? That answer, not the incorporation itself, controls the tax bill. Many business owners never ask, and they overpay for years without knowing it.

How a C Corporation Is Actually Taxed

A C Corporation is its own taxpayer. It files Form 1120 and pays a flat 21% federal income tax on its profit. That 21% rate has been in place since the 2017 tax law and remains the corporate rate for the 2026 tax year.

The catch arrives when the corporation distributes money to you, the owner. Those dividends are taxed again on your personal return at capital gains rates (0%, 15%, or 20% depending on income). This is the famous “double taxation” of C Corps: the profit gets taxed once at the corporate level and a second time when it lands in your pocket.

A Concrete Double-Taxation Example

Say your C Corp earns $200,000 in profit and you want to take it all home.

• Corporate tax: $200,000 x 21% = $42,000 paid by the corporation.
• Remaining: $158,000 available to distribute as a dividend.
• Dividend tax at 15%: $158,000 x 15% = $23,700 paid by you personally.
• Total tax on that $200,000: $65,700, an effective rate near 33%.

That is the worst-case C Corp scenario: you earned the profit and pulled it all out. The structure punishes owners who need the cash now. It rewards owners who leave profit inside the company to grow.

When the C Corp Still Wins

Double taxation only bites when you pull money out. If you reinvest profit back into the business, the 21% flat rate can be lower than the top personal rates that an S Corp owner faces. The C Corp shines in specific situations:

• You are reinvesting most profit into growth, equipment, or hiring.
• You plan to raise venture capital or issue multiple stock classes (investors often require a C Corp).
• You want to offer a wide menu of tax-free fringe benefits to owner-employees.
• Your stock may qualify for the Qualified Small Business Stock exclusion under Section 1202, which can wipe out capital gains tax on a future sale.

Red Flag Alert: Do not form a C Corp just because online articles call it “the structure big companies use.” A solo consultant pulling all profit out each year will hand the IRS thousands in avoidable double taxation. The structure must match how you actually use the money.

How an S Corporation Slashes Self-Employment Tax

An S Corporation is a pass-through entity. It files Form 1120-S, an informational return, but the corporation itself pays no federal income tax. Profit flows to your personal return through a Schedule K-1, and you pay tax once at your individual rate. No double taxation.

The real magic is how an S Corp handles self-employment tax. As a sole proprietor or single-member LLC, every dollar of net profit gets hit with 15.3% self-employment tax (Social Security and Medicare) on top of income tax. An S Corp lets you split your income into two buckets:

• Reasonable salary: subject to payroll taxes (the 15.3%).
• Distributions: the remaining profit, which is NOT subject to self-employment tax.

The Salary Split in Real Numbers

Picture a marketing consultant netting $150,000 in profit.

As a sole proprietor: $150,000 x 15.3% self-employment tax = roughly $21,195 (before the slight adjustment for the deductible half). The full profit faces the SE tax hit.

As an S Corp paying a reasonable $70,000 salary:

• Payroll tax on salary: $70,000 x 15.3% = $10,710.
• Remaining $80,000 taken as distribution: $0 self-employment tax.
• Payroll tax savings: roughly $10,485 in a single year.

That saving repeats every year the business stays profitable. Over a decade, that is six figures staying in your account instead of the Treasury’s. This is why solo owners earning solid profit should seriously weigh the S Corp election. Our tax planning services run these exact calculations before you commit to a structure, because the right salary number is where the strategy lives or dies.

Want to see how your own profit splits out? Plug your numbers into this small business tax calculator to estimate the gap between structures before you file anything.

Pro Tip: The IRS requires that S Corp salary be “reasonable” for the work performed. Pay yourself too little to dodge payroll tax and you invite an audit. A salary in line with what you would pay an employee to do your job is the defensible zone.

KDA Case Study: Consultant Who Stopped Overpaying $11K a Year

A Los Angeles-based management consultant came to us operating as a single-member LLC, taxed as a sole proprietor. Her business was clean and profitable, netting about $165,000 per year, but she was paying the full 15.3% self-employment tax on every dollar of that profit. Her prior preparer had filed her returns accurately for three straight years and never once mentioned that her structure was costing her thousands she did not have to pay.

When she asked us to review her setup, the problem was immediate. She had the legal entity but the wrong tax election. We walked her through what it means to inc a S Corp and C Corp, then modeled both. The C Corp made no sense for her because she pulled nearly all profit out each year and would have eaten double taxation. The S Corp election was the obvious win.

We filed Form 2553 to elect S Corp treatment, set a reasonable salary of $78,000 based on market rates for senior consultants, and routed the remaining roughly $87,000 as distributions free of self-employment tax. The payroll tax savings came to about $11,300 in her first full year under the new structure. She paid us $3,900 for the restructure, the S Corp election, payroll setup, and the year’s filing. That is a first-year return of roughly 2.9x, and the savings now recur annually with no additional restructuring cost.

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.

S Corp vs C Corp: The Side-by-Side Breakdown

When owners weigh whether to inc a S Corp and C Corp, a direct comparison cuts through the noise. Here is how the two tax treatments stack up on the factors that move your bill.

Factor	S Corporation	C Corporation
Federal entity tax	None (pass-through)	21% flat on profit
Double taxation	No	Yes, on dividends
Self-employment tax savings	Yes, via salary split	Not applicable the same way
Ownership limits	Max 100 shareholders, US only, one stock class	Unlimited shareholders, multiple classes
Outside investors / VC	Rarely accepted	Preferred structure
IRS form filed	Form 1120-S	Form 1120
Best for	Profitable owners taking cash out	Reinvesting or raising capital

Key Takeaway: The S Corp wins when you take profit home each year and want to cut self-employment tax. The C Corp wins when you reinvest, scale, or chase outside investors who demand multiple stock classes.

Should You Elect S Corp Status? A Decision Framework

Rules of thumb only go so far, so here is a cleaner diagnostic.

Lean S Corp if:

• Your business profit runs above $60,000 to $75,000 per year.
• You pull most of that profit out for personal use.
• You can justify and run a reasonable salary through payroll.
• Your owners are all US individuals and you have one class of stock.

Lean C Corp if:

• You reinvest the bulk of profit back into growth.
• You plan to raise venture capital or issue preferred shares.
• You want generous tax-free fringe benefits for owner-employees.
• You are building toward a sale that might qualify for Section 1202 QSBS treatment.

Stay a sole proprietor or default LLC if:

• Your profit is under roughly $40,000 and payroll overhead would eat the savings.
• You want maximum simplicity with no payroll filings.
• You are running net losses while building the business.

How Do I Actually Elect S Corp Status?

Electing S Corp treatment is a specific filing, not a checkbox at incorporation. Here is the clean process.

1. Confirm you have a legal entity. You need an existing corporation or LLC first. The S Corp election sits on top of that entity.
2. Get your EIN. If you do not have an Employer Identification Number, apply free at IRS.gov. It takes about five minutes.
3. Complete Form 2553. This is the Election by a Small Business Corporation. Every shareholder must sign it. Enter your entity name, EIN, and the effective date exactly as they appear on your formation documents.
4. File by the deadline. To take effect for the current tax year, file Form 2553 within 2 months and 15 days of the start of that tax year. Miss it and you can request late-election relief with a reasonable-cause explanation.
5. Set up payroll. Once you are an S Corp, you must run a real payroll for your reasonable salary, with withholdings and quarterly filings.

What happens if you miss the deadline? Your corporation stays taxed as a C Corp for the whole year, meaning no self-employment tax savings and possible double taxation on any distributions. The IRS does offer late-election relief under Revenue Procedure 2013-30 if you have a reasonable cause, but do not bank on it.

What If I Already Formed a C Corp by Default?

This is more common than owners realize. You incorporated, never filed anything else, and the IRS is treating you as a C Corp. The good news: you can usually still elect S Corp status by filing Form 2553, as long as you meet the S Corp eligibility rules (100 or fewer shareholders, all US individuals or qualifying trusts, one class of stock).

If you have already been operating and paying as a C Corp for a year or more, switching is still possible, but the timing and any retained earnings need professional review. Converting with accumulated earnings and profits can trigger specific tax traps like the built-in gains tax, so this is not a DIY moment.

Can an LLC Choose S Corp or C Corp Taxation?

Yes, and this surprises people. An LLC is a legal structure, not a tax category. By default a single-member LLC is taxed as a sole proprietor and a multi-member LLC as a partnership. But an LLC can file Form 2553 to be taxed as an S Corp, or Form 8832 to be taxed as a C Corp, without ever changing its legal form.

That means you do not have to form a corporation to get S Corp tax savings. Many owners keep the simpler LLC paperwork and layer an S Corp tax election on top. If you want to compare the pure legal and tax mechanics of each path, our team covers the full roadmap in our complete guide to S Corp tax strategy in California, which digs deeper into the state-level rules that affect your net savings.

California-Specific Considerations

If you operate in California, the structure math shifts, and this trips up owners who only read federal guidance. California does not fully respect the federal S Corp pass-through for state purposes. S Corps in California pay a 1.5% state franchise tax on net income, with an $800 minimum annual franchise tax regardless of profit.

• S Corp in California: 1.5% state tax on net income, $800 minimum franchise tax, files Form 100S.
• C Corp in California: 8.84% state corporate tax, $800 minimum franchise tax, files Form 100.

Even with the 1.5% state layer, the S Corp usually still comes out ahead for profitable owners because the federal self-employment tax savings dwarf the state franchise cost. But the $800 minimum and the 1.5% change the break-even point, which is why a California owner should never copy a generic national rule of thumb. Run the state numbers before you elect.

This information is current as of 10/13/2026. Tax laws change frequently. Verify updates with the IRS or FTB if reading this later.

Common Mistakes That Cost Owners Thousands

The gap between a good structure and a costly one usually comes down to a handful of avoidable errors.

Paying Yourself an Unreasonably Low Salary

Owners hear “distributions avoid self-employment tax” and set a $10,000 salary on $150,000 of profit. The IRS has specifically flagged this. An unreasonably low salary relative to your role is a top S Corp audit trigger and can lead to reclassified wages, back payroll taxes, and penalties.

Forgetting the Election Deadline

Form 2553 is time-sensitive. Miss the 2-month-and-15-day window and you lose a full year of savings unless you qualify for late relief. Set a calendar reminder the moment you incorporate.

Pulling All Profit Out of a C Corp

If you chose C Corp treatment but take every dollar home as a dividend, you are paying the full double-taxation price with none of the reinvestment benefit. The structure only works when the money strategy matches it.

Assuming Incorporation Equals a Tax Election

The biggest one. Incorporating alone leaves you as a default C Corp. If you wanted S Corp savings, you had to file for them. Thousands of owners discover this only when a new accountant reviews the file.

Frequently Asked Questions

Do I pay myself a salary in a C Corp too?

Yes. If you work in your C Corp, you are an employee and must take a reasonable salary through payroll. The difference is that C Corp distributions come out as dividends taxed again at the personal level, while S Corp distributions skip self-employment tax entirely.

Can I switch from C Corp to S Corp later?

Usually yes, by filing Form 2553, provided you meet S Corp eligibility rules. Watch out for retained earnings and the built-in gains tax if you have been operating as a C Corp. Have a professional review the conversion before you file.

Will electing an S Corp trigger an audit?

The election itself does not. What raises risk is paying yourself an unreasonably low salary to dodge payroll tax. Set a defensible salary that matches market rates for your role and you stay in safe territory.

Is a C Corp ever better for a small business?

Yes, when you reinvest most profit, plan to raise venture capital, want broad tax-free fringe benefits, or are building toward a Section 1202 QSBS sale. For owners who take profit home each year, the S Corp almost always wins.

The letters after your business name are not branding. They are a tax decision worth thousands a year, and the IRS is not going to pick the cheaper one for you.

Book Your Entity Tax Strategy Session

If you are not certain whether your corporation is costing you money in avoidable self-employment tax or double taxation, that uncertainty is exactly where owners lose the most. We will model your S Corp and C Corp outcomes side by side, set a defensible salary, and show you the first-year savings in real dollars before you commit. Book a personalized consultation with our strategy team and walk away knowing which structure keeps the most of your money. Click here to book your consultation now.