Quick Answer

The difference between s corp c corp llc comes down to three things: who pays the tax, how much self-employment tax you owe, and how much paperwork you sign up for. An LLC is a legal entity that defaults to pass-through taxation and pays self-employment tax on every dollar of profit. An S Corp is a tax election that splits your profit into salary and distributions, which cuts self-employment tax. A C Corp is a separate taxpayer that pays a flat 21 percent federal rate and taxes you again when it distributes money to you.

Most California business owners do not need a new entity. They need a different tax election on the entity they already have. That distinction is worth five figures a year to the right owner, and it is the single most misunderstood point in this entire conversation.

The Mistake That Costs Owners $9,000 a Year

Here is the fear that drives bad decisions: owners believe that forming an LLC automatically lowers their taxes. It does not. Not by one dollar.

A single-member LLC with no election filed is treated by the IRS as a disregarded entity. Your profit lands on Schedule C of your personal return, exactly as it would if you never filed anything with the Secretary of State. You pay ordinary income tax on the profit, and you pay 15.3 percent self-employment tax on the first $176,100 of net earnings for 2025, then 2.9 percent Medicare on everything above that, plus the 0.9 percent Additional Medicare Tax once you cross $200,000 single or $250,000 married filing jointly.

Now the turn. The LLC gave you liability protection, which matters. But the tax savings everyone talks about come from the election you file on top of the LLC, not the LLC itself. An owner netting $150,000 who files Form 2553 and runs a defensible $85,000 salary moves roughly $65,000 of profit out of self-employment tax territory. At 15.3 percent, that is about $9,945 in payroll tax avoided in a single year.

That is the real answer to the difference between s corp c corp llc question. One is a legal wrapper. Two are tax treatments.

Define the Terms Before You Choose

• LLC (Limited Liability Company): A state-law entity that separates your personal assets from business liabilities. In plain English: a legal shield, not a tax strategy.
• S Corporation: A federal tax election under Subchapter S. The business files Form 1120-S, issues you a W-2, and passes remaining profit to you on a Schedule K-1. In plain English: you become both employee and owner.
• C Corporation: A separate taxpaying entity under Subchapter C. It files Form 1120, pays 21 percent federal corporate tax, and dividends to shareholders get taxed again at the personal level. In plain English: two layers of tax, but with benefits the other two cannot match.
• Disregarded Entity: An LLC with one owner and no tax election. The IRS ignores it and taxes you directly.

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

Here is where the difference between s corp c corp llc becomes concrete. The table below shows what actually changes on your tax return.

Factor	LLC (Default)	S Corp Election	C Corp
Who pays federal tax	You, personally	You, personally	The corporation, then you
Federal tax form	Schedule C or 1065	Form 1120-S	Form 1120
Self-employment tax	On 100% of profit	Only on W-2 salary	Only on W-2 salary
Federal rate	10% to 37% personal	10% to 37% personal	Flat 21% corporate
QBI deduction eligible	Yes, up to 20%	Yes, on K-1 income	No
Payroll required	No	Yes, mandatory	Yes, if you work there
California entity tax	$800 min + LLC fee	1.5% of net or $800 min	8.84% or $800 min
Ownership limits	None	100 shareholders, US only	Unlimited, any type
Loss pass-through	Yes	Yes, basis permitting	No, trapped in entity
Annual admin cost	$500 to $1,500	$2,500 to $5,000	$3,500 to $8,000

Notice the row that most comparison articles skip: the California entity-level tax. An LLC in California pays the $800 minimum franchise tax plus a gross receipts fee that climbs to $11,790 once revenue exceeds $5 million. An S Corp pays 1.5 percent of California net income with an $800 floor. A C Corp pays 8.84 percent of California net income. Those numbers can flip a decision that looks obvious at the federal level, which is why business owners in California need to run both layers before electing anything.

For a complete breakdown of how these elections play out across a full tax year in California, see our complete guide to S Corp tax strategy in California.

Key Takeaway

The LLC question is a liability question. The S Corp and C Corp question is a tax question. Answer them separately or you will solve the wrong problem.

KDA Case Study: Marketing Consultant Saves $11,400 With One Form

Daniel runs a digital marketing consultancy out of Pasadena. Single-member LLC formed in 2021, no tax election filed. By 2024 he was netting $168,000 and writing a quarterly estimated tax check that made him physically uncomfortable. His prior preparer told him the LLC was “already the tax-efficient structure.” It was not.

When he came to KDA, we ran the numbers on his actual situation rather than a generic template. Comparable marketing consultants in Los Angeles County with his client load and billable profile supported a salary in the $92,000 to $98,000 range. We set it at $95,000 and documented the reasoning with compensation survey data, a written job description, and an hours log.

What that did: $73,000 of profit moved from self-employment tax to K-1 distribution. At the combined 15.3 percent rate on the portion below the wage base plus Medicare above it, the federal payroll tax savings came to roughly $11,400 in year one. The California 1.5 percent S Corp tax cost him about $2,520, and payroll processing plus the additional return added $3,200 in fees.

Net first-year benefit: approximately $5,680 after every added cost. He paid KDA $3,900 for the election, payroll setup, reasonable compensation study, and the 1120-S. That is a 1.46x return in year one, and because the structure persists, year two returns roughly $8,200 with no setup costs repeating.

The part Daniel did not expect: the documented salary study also protected him. His prior preparer had suggested a $40,000 salary, which would have been an audit flag in a profession with published compensation data.

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.

When the S Corp Election Actually Pays

There is a threshold below which the S Corp election loses money. Every owner should know where it sits.

Yes, elect S Corp if:

• Net profit after reasonable salary consistently exceeds $45,000 to $50,000
• You can defend a market-rate salary with comparable data
• You are willing to run formal payroll with quarterly 941 filings
• Your profit is reasonably stable year over year
• You are a US citizen or resident with fewer than 100 owners

No, stay an LLC if:

• Net profit is under $40,000
• Your income swings wildly and a fixed salary would strain cash flow
• You have foreign partners or an entity owner, which disqualifies S status outright
• You expect losses for the next two to three years
• The $3,000 to $5,000 in added compliance cost eats more than the payroll tax savings

Run the math before you file. A small business tax calculator will give you a starting estimate of where your profit lands and whether the election clears the breakeven line.

Step-by-Step: How to Elect S Corp Status

1. Confirm eligibility – Domestic entity, 100 or fewer shareholders, all individuals or qualifying trusts, no nonresident alien owners, one class of stock.
2. Get your EIN – If you do not have one, apply free at IRS.gov. Takes about five minutes online.
3. Complete Form 2553 – Enter your legal entity name exactly as it appears on your formation documents. A mismatch here is the most common rejection cause.
4. Get every shareholder signature – Part I requires consent from all owners as of the election date. Missing one signature voids the filing.
5. File by the deadline – Two months and 15 days after the start of the tax year you want the election to apply. For calendar-year filers in 2026, that is March 16, 2026.
6. Set up payroll before your first distribution – This is where owners get into trouble. Taking money out before payroll exists creates a reclassification risk.
7. Register with the California EDD – You now have an employee, which means state payroll registration, DE 9 filings, and unemployment insurance.

Missed the deadline? Revenue Procedure 2013-30 allows relief for late elections filed within three years and 75 days of the intended effective date, provided you can show reasonable cause and have treated the business as an S Corp consistently.

Why Most Owners Get the C Corp Wrong

The 21 percent flat rate is seductive. It is also, for most small business owners, a trap.

Here is the arithmetic nobody shows you. A C Corp earns $200,000 and pays 21 percent federal, leaving $158,000. You want that cash personally, so the corporation issues a dividend. That dividend gets taxed again at your qualified dividend rate, which is 15 percent for most mid-income earners and 20 percent plus the 3.8 percent net investment income tax at higher brackets. At 15 percent, you lose another $23,700. Combined federal cost: $65,700, or 32.85 percent.

Run the same $200,000 through an S Corp with a $110,000 salary. You pay self-employment-equivalent payroll tax on the salary, ordinary income tax on the whole amount, and you likely qualify for a 20 percent Qualified Business Income deduction on the $90,000 K-1 portion under Section 199A. The effective federal cost lands meaningfully below the C Corp path for most owners who need the cash.

Red Flag Alert: The C Corp math only wins when you leave profits inside the business. The moment you need the money personally, the second layer of tax erases the advantage. And if you accumulate more than $250,000 of retained earnings without a documented business purpose, the IRS can assess the Accumulated Earnings Tax at 20 percent under IRC Section 531.

When the C Corp Genuinely Wins

• Qualified Small Business Stock – Section 1202 allows up to $10 million or 10 times basis in gain exclusion on sale, but only for C Corp stock held five years. For a founder planning an exit, this single provision can be worth millions.
• Venture capital – Institutional investors and funds generally cannot hold S Corp stock. A Delaware C Corp is the price of admission.
• Full fringe benefit deductibility – A C Corp deducts 100 percent of owner health insurance, disability coverage, and Section 105 medical reimbursement plans. S Corp owners holding more than 2 percent face restrictions.
• Profit retention for growth – If you are reinvesting every dollar into equipment, inventory, or hiring, the 21 percent rate beats a 37 percent personal bracket.

What About Partnerships and Multi-Member LLCs?

A multi-member LLC defaults to partnership taxation and files Form 1065 with K-1s to each member. This is a fourth path that gets lost in the difference between s corp c corp llc conversation, and it has real advantages the S Corp cannot replicate.

Partnerships allow special allocations. You can allocate 70 percent of depreciation to one partner and 50 percent of profit to another if the arrangement has substantial economic effect under the Section 704(b) regulations. An S Corp cannot do this. The single-class-of-stock rule forces strictly pro-rata allocations based on ownership percentage.

Partnerships also give partners basis in entity-level debt. A real estate LLC with a $2 million mortgage gives its members outside basis in their share of that debt, which supports loss deductions. S Corp shareholders get no basis from corporate debt unless they personally lend the money to the corporation. For anyone holding leveraged property, this difference decides whether your losses are deductible this year or suspended indefinitely.

If your entity holds rental property, the partnership structure is almost always the right answer, and real estate investors who elect S Corp status on an appreciating property often discover they cannot move the asset out later without triggering gain. Our walkthrough of how to file Form 1065 covers the mechanics in detail.

Can I Change My Entity Classification Later?

Yes, but the doors swing in only one direction cleanly.

LLC to S Corp: Easy. File Form 2553. No asset transfer, no new EIN in most cases, no gain recognition. Your operating agreement should be reviewed to remove provisions that could create a second class of stock.

S Corp to C Corp: Straightforward mechanically. File a revocation statement with the IRS signed by shareholders holding more than 50 percent of shares. But you are now locked out of re-electing S status for five tax years under IRC Section 1362(g) absent IRS consent. Our breakdown of what happens when you convert an S Corp to a C Corp explains why the 21 percent rate often costs more than it saves.

C Corp to S Corp: Possible, but it drags two expensive problems with it. Built-in gains tax applies at 21 percent on appreciation that existed at conversion if assets are sold within five years. And any accumulated earnings and profits from the C Corp years can trigger passive income problems and even terminate your S election if passive receipts exceed 25 percent of gross receipts for three consecutive years.

S Corp to LLC: This is the painful one. Distributing appreciated assets out of a corporation is treated as a sale at fair market value under IRC Section 311(b). A property worth $800,000 with a $300,000 basis generates $500,000 of recognized gain the moment you move it out. This is why putting real estate inside an S Corp is a decision you may live with for decades.

Pro Tip: Decide your structure before assets appreciate. Entity changes are cheap on day one and expensive on day one thousand.

California Specifics You Cannot Ignore

Everything above describes federal treatment. California adds its own layer, and the state does not always follow federal rules.

LLC in California: $800 annual minimum franchise tax, due by the 15th day of the fourth month, paid with Form 3522. On top of that sits the LLC gross receipts fee: $900 at $250,000 in California receipts, $2,500 at $500,000, $6,000 at $1 million, and $11,790 above $5 million. That fee is based on gross receipts, not profit, which means a low-margin business can owe thousands while barely breaking even. Annual return is Form 568.

S Corp in California: California does not fully recognize the federal pass-through benefit. The state imposes a 1.5 percent tax on California net income with an $800 minimum. Return is Form 100S. The tradeoff: no gross receipts fee. A business with $3 million in revenue and $200,000 in profit pays $6,000 in LLC fees versus $3,000 in S Corp tax. The S Corp wins on that math alone.

C Corp in California: 8.84 percent of California net income, $800 minimum, filed on Form 100. Stack that on 21 percent federal and 15 percent qualified dividend treatment and the total burden on distributed profit approaches 40 percent.

California also offers the Pass-Through Entity Elective Tax, which lets qualifying S Corps and partnerships pay 9.3 percent at the entity level and claim a federal deduction, working around the SALT cap. The election is made annually on Form 3804 with a June 15 prepayment requirement. For high-income owners this is worth several thousand dollars a year and is routinely missed by preparers who do not specialize in California. Confirm current thresholds with the California Franchise Tax Board before relying on any figure.

This information is current as of 11/12/2026. Tax laws change frequently. Verify updates with the IRS or FTB if reading this later.

What Is Reasonable Compensation and How Do I Set It?

This is the single biggest audit exposure in the S Corp world. The IRS has won case after case against owners who paid themselves $20,000 and distributed $180,000.

There is no statutory formula. IRS guidance on S corporation compensation lists the factors examiners weigh: training and experience, duties performed, time devoted to the business, dividend history, payments to non-shareholder employees, what comparable businesses pay for similar services, and the use of a formula to determine compensation.

How to Document a Defensible Salary

1. Pull comparable wage data – Bureau of Labor Statistics occupational wage data by metro area is free and credible.
2. Write a job description – List the actual functions you perform. An owner who does sales, delivery, and admin should be compensated for all three roles.
3. Track hours – A part-time owner can justify a part-time salary. Full-time cannot be argued down to a token amount.
4. Allocate between labor and capital – If the business generates profit from invested equipment or staff you do not directly supervise, that portion is return on capital, not wages.
5. Write it down and date it – A contemporaneous memo in the corporate file carries far more weight than a reconstruction prepared during an exam.
6. Revisit it annually – A salary set in 2021 and never adjusted while revenue tripled is a flag.

Rules of thumb circulate widely, including the 60/40 split and the “one-third of profit” formula. None of them appear anywhere in the Internal Revenue Code. They are not defenses. Comparable market data is. Our tax planning services include a documented reasonable compensation study because the study, not the number, is what protects you.

Will Electing S Corp Status Trigger an Audit?

The election itself does not. Form 2553 is a routine filing processed by the millions.

What draws attention is the pattern. A 1120-S showing $18,000 in officer compensation against $240,000 in distributions is a mismatch that both IRS and FTB examiners are trained to spot. So is an 1120-S with zero W-2 wages and large shareholder distributions, which is effectively an admission that no salary was paid.

Other triggers worth knowing:

• Shareholder loans that never get repaid and look like disguised distributions
• Distributions exceeding stock basis, which create taxable capital gain
• Personal expenses run through the corporation without reimbursement documentation
• Late or missing 941 filings alongside large K-1 income

If a letter does arrive, the response window is short and the first reply shapes everything that follows. Our audit representation services handle the correspondence so you are not negotiating with an examiner on your own.

Do I Need a Lawyer or a CPA to Decide This?

Both, but in sequence and for different reasons.

A CPA or tax strategist runs the numbers: breakeven analysis, reasonable compensation study, California entity tax comparison, QBI modeling, and the five-year projection that shows whether the election pays.

An attorney drafts the operating agreement or bylaws, handles multi-owner buy-sell provisions, and manages the legal side of conversions. If you have partners, equity splits, or planned outside investment, get the legal documents right before you file any tax election. A poorly drafted operating agreement with disproportionate distribution rights can create a second class of stock and invalidate your S election retroactively.

Three Questions to Answer Before You Decide

1. How much profit will the business generate after I pay myself a market salary? Below roughly $45,000, the S Corp election costs more than it saves.
2. Do I need this money personally, or am I reinvesting it? Personal use points toward S Corp. Heavy reinvestment or a planned exit under Section 1202 points toward C Corp.
3. What is inside the entity? Appreciating real estate belongs in a partnership or LLC, almost never in a corporation of any flavor.

Answer those three honestly and the structure usually picks itself. For most California service businesses netting $80,000 to $400,000, the answer is an LLC with an S Corp election. Above that, and especially with partners or outside capital, the analysis gets genuinely complicated and deserves a modeled projection rather than a rule of thumb.

The IRS is not hiding the better structure from you. You were just never shown the math.

Stop Guessing on Your Entity Structure

If you are running an LLC with no election and netting more than $80,000, there is a strong chance you are paying five figures a year in self-employment tax that a Form 2553 would have eliminated. And if you already elected S Corp status with a salary somebody picked out of thin air, you are carrying audit exposure you do not know about. Book a strategy session with KDA and walk away with a modeled comparison of all three structures, a defensible salary figure backed by comparable data, and a filing calendar with every federal and California deadline mapped out. Click here to book your consultation now.