Here is a number that stops most founders cold: two businesses earning the exact same $150,000 profit can hand the IRS a difference of more than $11,000 simply based on how they are structured on paper. That is not a loophole or a gimmick. That is the plain reality of the s corp vs c corp vs llc tax decision, and it is the single most expensive choice many business owners make without ever running the math.

Most people pick an entity because a friend told them to, or because an online formation site pushed the cheapest option at checkout. Then they spend years overpaying because nobody ever re-ran the numbers as their income grew. This guide fixes that. We are going to break down exactly how each structure is taxed, who should use which, and where the real dollars are won or lost.

Quick Answer: How the s corp vs c corp vs llc tax Comparison Actually Works

An LLC is taxed by default as a pass-through, meaning profit flows to your personal return and gets hit with both income tax and the full 15.3% self-employment tax. An S Corp is also a pass-through, but it splits your income into salary and distributions, and only the salary portion pays payroll tax. A C Corp is a separate taxpayer that pays a flat 21% corporate tax, then taxes dividends again at the shareholder level, creating double taxation.

In plain English: LLCs are simple but can be tax-heavy as profit climbs. S Corps shine in the middle-income range because they shrink self-employment tax. C Corps make sense when you plan to reinvest heavily, raise venture capital, or offer stock to investors.

Understanding the LLC: Flexible, Simple, and Sometimes Expensive

An LLC, or Limited Liability Company, is not actually a tax classification at all. It is a legal structure created at the state level that shields your personal assets from business liabilities. The IRS does not have an “LLC tax return.” Instead, the IRS taxes your LLC as either a sole proprietorship (if you are the only owner) or a partnership (if there are multiple owners), unless you elect otherwise.

How a Default LLC Is Taxed

With a single-member LLC, every dollar of profit lands on your personal Form 1040 through a Schedule C. That profit faces two layers:

• Ordinary income tax based on your personal bracket (10% to 37% federally)
• Self-employment tax of 15.3% on net earnings, covering Social Security and Medicare

Here is where it bites. Say Marcus runs a consulting LLC and nets $120,000 in profit. He owes self-employment tax on roughly 92.35% of that, which comes to about $16,900, on top of his regular income tax. That self-employment tax is the exact line item that the S Corp election is designed to shrink.

Who the LLC Is Perfect For

The default LLC structure is the right call when your net profit is modest, generally under $40,000 to $50,000, or when your business is brand new and you want to keep compliance costs and paperwork minimal. Many freelancers and side-hustle operators start here for good reason. If you are running a solo operation, our guidance for self-employed taxpayers walks through how Schedule C income interacts with your overall tax picture.

Red Flag Alert: Many LLC owners assume forming the entity automatically lowers their taxes. It does not. A default single-member LLC is taxed identically to a sole proprietor. The tax savings only arrive when you make a deliberate election, which we cover below.

The S Corp Election: Where the s corp vs c corp vs llc tax Math Gets Interesting

An S Corporation is not a separate entity you form from scratch. It is a tax election you make, usually by filing Form 2553 with the IRS. You can have an LLC that is taxed as an S Corp, which gives you the legal simplicity of the LLC and the tax advantages of the S Corp at the same time.

The Salary-Plus-Distribution Split

The entire magic of the S Corp comes from one idea. As an S Corp owner, you must pay yourself a “reasonable salary” for the work you do. That salary is subject to payroll taxes. But any profit above that salary can be taken as a distribution, and distributions are not subject to the 15.3% self-employment tax.

Let’s run Marcus’s numbers again, but now as an S Corp. He nets $120,000. He pays himself a reasonable salary of $70,000 and takes the remaining $50,000 as a distribution.

• Payroll tax on $70,000 salary: roughly $10,710
• Payroll tax on $50,000 distribution: $0

Compared to the $16,900 he paid as a default LLC, Marcus just saved about $6,190 in a single year by changing nothing but his tax classification. Scale that over a decade and you are looking at real wealth. For a full breakdown of how this works specifically in California, see our complete guide to S Corp tax strategy.

What “Reasonable Salary” Actually Means

This is where the IRS pays close attention. You cannot pay yourself a $10,000 salary and take $110,000 in distributions to dodge payroll tax entirely. The IRS requires your salary to reflect what someone would be paid for comparable work in your industry and region. According to IRS guidance on S corporation compensation, officers who perform services are employees and must receive reasonable wages before non-wage distributions.

Pro Tip: A common benchmark is the “60/40 rule,” where roughly 60% of your income is salary and 40% is distribution, though the right split depends entirely on your role and industry. Document your reasoning. If you want to estimate your own numbers, run them through a small business tax calculator before you lock in a figure.

Who the S Corp Is Perfect For

The S Corp election becomes worthwhile once your net profit reliably exceeds $60,000 to $80,000 per year. Below that, the added costs of running payroll, filing a separate 1120-S return, and maintaining compliance can eat up the savings. Above that threshold, the self-employment tax reduction usually wins by a wide margin.

KDA Case Study: Consulting LLC Owner Saves $7,800 With an S Corp Restructure

Priya ran a marketing consultancy as a single-member LLC in Southern California. She came to us netting about $145,000 per year and was stunned at her self-employment tax bill, which hovered near $20,500 annually. She had been told an LLC was “the tax-smart choice,” but nobody had revisited that advice as her income tripled over four years.

We ran a full entity analysis and determined she was a strong candidate for an S Corp election. We filed Form 2553 to have her existing LLC taxed as an S Corp, set up a compliant payroll system, and established a reasonable salary of $85,000 based on industry compensation data for senior marketing consultants in her market. The remaining $60,000 became distributions exempt from self-employment tax.

The result: her payroll tax dropped to roughly $13,000, a first-year savings of about $7,800. She paid KDA $3,000 for the restructure, entity analysis, and first-year compliance setup. That works out to a 2.6x first-year return, and the savings now repeat every year she stays in the structure. Just as important, we documented her reasonable salary thoroughly so the position holds up under 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.

The C Corp: Double Taxation, But a Powerful Tool for the Right Business

A C Corporation is a fully separate legal and tax entity. It files its own return, Form 1120, and pays a flat 21% federal corporate tax rate on its profits. This is the default structure for any corporation that does not elect S Corp status, and it is what nearly every publicly traded company uses.

Understanding Double Taxation

The famous downside of the C Corp is double taxation. The corporation pays 21% on its profits. Then, when it distributes those profits to shareholders as dividends, the shareholders pay tax again on their personal returns, typically at the 15% or 20% qualified dividend rate.

Here is the math on $100,000 of corporate profit paid out as dividends:

• Corporate tax (21%): $21,000
• Remaining profit: $79,000
• Dividend tax at 15%: about $11,850
• Total tax: roughly $32,850, an effective rate near 33%

That looks brutal compared to a pass-through, and for a small service business it usually is. But double taxation only triggers when profits are distributed. If you reinvest the money back into the company, it is never taxed a second time.

Who the C Corp Is Perfect For

The C Corp earns its place in specific situations:

• Startups raising venture capital. Investors and VCs almost always require C Corp status because it allows multiple stock classes and foreign ownership.
• Businesses reinvesting heavily. If you plow profits back into growth rather than taking them home, the flat 21% can beat high personal brackets.
• Companies pursuing the QSBS exclusion. Qualified Small Business Stock under Section 1202 can let founders exclude up to $10 million in gains, but only C Corp stock qualifies.
• Owners wanting robust fringe benefits. C Corps can deduct certain benefits more generously than pass-throughs.

If your business is scaling, raising capital, or operating as a larger firm, our corporate tax services help you model whether the 21% rate works in your favor.

Side-by-Side Comparison: s corp vs c corp vs llc tax at a Glance

Here is how the three structures stack up on the factors that matter most:

Factor	LLC (Default)	S Corp	C Corp
Taxation type	Pass-through	Pass-through	Separate entity
Self-employment tax	On all net profit	On salary only	Not applicable
Double taxation	No	No	Yes, on dividends
Federal profit tax	Personal rates	Personal rates	Flat 21%
Payroll required	No	Yes	Yes
Tax return form	Schedule C or 1065	1120-S	1120
Best for	New or small businesses	Profit $60K+	Raising capital, reinvesting

Should You Elect S Corp Status? A Simple Decision Framework

Deciding between these structures does not have to feel like guesswork. Use these criteria:

Choose a default LLC if:

• Your net profit is under roughly $50,000
• You want the lowest possible compliance burden
• Your business is new and income is unpredictable

Elect S Corp status if:

• Your net profit reliably exceeds $60,000 to $80,000
• You can justify and pay a reasonable salary
• You are willing to run payroll and file a separate return

Choose a C Corp if:

• You are raising venture capital or issuing stock
• You plan to reinvest most profits back into the business
• You want to pursue the QSBS gain exclusion

What If I Already Formed an LLC? Can I Still Change?

Yes, and this is one of the most common questions we hear. You do not have to dissolve your LLC and start over. You can keep your existing LLC and simply change how it is taxed by filing an election with the IRS. To be taxed as an S Corp, you file Form 2553. To be taxed as a C Corp, you file Form 8832.

There are deadlines to watch. Generally, Form 2553 must be filed within two months and 15 days of the beginning of the tax year you want the election to take effect, though the IRS allows late-election relief in many cases. Working with a professional on the entity formation and election process ensures you hit the right deadlines and set up compliant payroll from day one.

Common Mistakes That Cost Business Owners Thousands

Mistake 1: Electing S Corp Status Too Early

If your profit is only $35,000, the S Corp payroll and filing costs can wipe out your savings. Run the numbers before you elect. The breakeven point is usually in the $60,000 range of net profit.

Mistake 2: Paying an Unreasonably Low Salary

Trying to take a $20,000 salary on $150,000 of profit is a classic audit trigger. The IRS has won numerous cases reclassifying distributions as wages and assessing back payroll taxes plus penalties. Document your salary logic with real market data.

Mistake 3: Forgetting California’s Franchise Tax and S Corp Tax

California imposes an annual minimum franchise tax of $800 on LLCs and corporations, and S Corps face an additional 1.5% state tax on net income. This information is current as of 10/27/2026. Tax laws change frequently, so verify updates with the IRS or California FTB if you are reading this later. California residents should always factor state-level costs into the entity decision rather than relying on federal math alone.

Frequently Asked Questions

Can an LLC be taxed as an S Corp and a C Corp at the same time?

No. You choose one tax classification at a time. An LLC can be taxed as a sole proprietorship, partnership, S Corp, or C Corp, but only one of these applies in any given tax year.

Does an S Corp save money for every business owner?

No. The savings depend on profit level. Below roughly $60,000 of net profit, the added costs often outweigh the self-employment tax savings. Above that, the S Corp usually wins, sometimes dramatically.

Will choosing a C Corp trigger an audit?

Not inherently. C Corps are a completely standard structure. Audits are triggered by reporting inconsistencies, not by entity type. What does draw scrutiny is an S Corp paying an unreasonably low salary.

How much does it cost to run an S Corp each year?

Beyond your base formation, expect payroll service costs, a separate 1120-S tax return, and bookkeeping. These typically run a few thousand dollars annually, which is why profit level matters so much in the decision.

Book Your Entity Strategy Session

If you are earning solid profit but still taxed as a default LLC, there is a strong chance you are overpaying the IRS by thousands every single year. The s corp vs c corp vs llc tax decision is not a one-time choice, it is something that should be re-evaluated as your income grows. Our strategy team will run your exact numbers, model each structure side by side, and show you precisely how much you could keep. Click here to book your consultation now and walk away knowing which entity puts the most money back in your pocket.