You formed a corporation, opened a business bank account, and started paying yourself. Now your CPA mentions an “S Corp election” and suddenly you’re wondering whether you’ve been leaving thousands of dollars in taxes on the table every year. You probably have.

What’s the difference between S Corp and C Corp is one of the most consequential questions a California business owner will ever ask — and most get the answer too late, too vague, or from someone who doesn’t understand the California-specific traps that make this decision twice as complicated as it looks on paper.

This guide breaks down the real financial difference between these two entity types, not just the legal definitions, but the actual dollar impact on your tax bill — and why the answer for most California business owners earning over $60,000 in profit points in one direction.

Quick Answer: S Corp vs. C Corp in Plain English

A C Corporation (C Corp) is a standard corporation that pays its own taxes at the corporate level. When it distributes profits to shareholders as dividends, those dividends get taxed again on the shareholder’s personal return. This is called double taxation, and it is exactly as painful as it sounds.

An S Corporation (S Corp) is a tax election — not a separate legal entity — that allows a corporation or LLC to pass its income directly through to the shareholders’ personal tax returns. The business itself pays no corporate income tax. Profits flow through once, get taxed once, and stop there.

For a California business owner earning $120,000 in net profit, this single structural difference can mean a gap of $18,000 to $30,000 in annual taxes. That is not a rounding error. That is a car payment, a college fund, or a down payment on a rental property.

The Double Taxation Trap: Why C Corps Cost More Than You Think

Here is how the C Corp math works in California for 2026.

A C Corp pays federal corporate income tax at a flat 21% rate on its profits under the current OBBBA tax framework. Then California adds its own corporate franchise tax at 8.84% on top. That means on $150,000 of net business profit, you are immediately handing over roughly $44,760 in entity-level taxes before you see a single dollar.

Now comes the second punch. When the corporation distributes what remains as a dividend to you, the shareholder, you pay federal qualified dividend tax (0%, 15%, or 20% depending on your income) plus California’s personal income tax, which runs up to 13.3% on dividends for high earners. There is no dividend deduction in California. No credit. No workaround. The state taxes that dividend as ordinary income at your full marginal rate.

Run the full scenario on $150,000 of C Corp profit for a California business owner in the 32% federal bracket:

• Corporate federal tax (21%): $31,500
• California franchise tax (8.84%): $13,260
• Remaining after entity tax: $105,240
• Federal dividend tax (15%): $15,786
• California income tax on dividend (9.3%): $9,787
• Total taxes paid: approximately $70,333 — or 46.9% of original profit

That is not a tax bill. That is a tax disaster.

The C Corp QSBS Exception Worth Knowing

One scenario where C Corp status makes strategic sense is if you are building a venture-backed startup and plan to hold shares for more than five years. Under IRC Section 1202, shareholders of a qualifying small business C Corp can exclude up to $10 million in capital gains from federal taxation when they sell. This is the Qualified Small Business Stock (QSBS) exclusion, and it only applies to C Corps — not S Corps. If you are raising institutional capital or planning an acquisition exit, talk to a tax attorney before electing S Corp status. For the overwhelming majority of small business owners, however, this exception is not relevant.

How the S Corp Election Actually Saves You Money

The S Corp tax advantage is built on one core mechanic: splitting your business income into two buckets — a reasonable salary and an owner distribution — and only paying self-employment tax on the salary portion.

Self-employment tax (SE tax) is 15.3% on the first $176,100 of net earnings (2026 threshold) and 2.9% above that. Every dollar of profit that gets reclassified as an owner distribution instead of a salary bypasses SE tax entirely. On a $120,000 profit with a $60,000 reasonable salary, that saves approximately $9,180 in SE tax per year. At $200,000 profit with an $80,000 salary, the savings climb to $18,360.

Add in the permanent 20% Qualified Business Income (QBI) deduction that S Corp shareholders qualify for under the One Big Beautiful Bill Act, and the total tax reduction compounds further. Many business owners who run their numbers for the first time are genuinely shocked at how much they have been overpaying.

The S Corp Tax Math in Practice

Let’s walk through a real scenario. Maria is a Sacramento-based marketing consultant running a single-member LLC taxed as a sole proprietor. Her net profit in 2025 was $160,000.

As a sole proprietor:

• SE tax: $22,472 (15.3% up to $176,100 threshold)
• Federal income tax (after QBI): approximately $28,800
• California income tax: approximately $14,240
• Total estimated tax: $65,512

After S Corp election with $72,000 reasonable salary:

• Payroll taxes on salary only: $11,016
• Federal income tax (after QBI on distribution): approximately $22,400
• California income tax: approximately $13,100
• Total estimated tax: $46,516

Annual savings: approximately $18,996 — just by changing the tax classification on the same $160,000 of income.

For deeper strategy on making this election work correctly in California, see our complete guide to S Corp tax strategy in California.

Want to estimate your own numbers before booking a consultation? Run your business profit through this small business tax calculator to see how the difference between entity structures affects your take-home income.

California-Specific Rules That Change the Calculation

Federal comparisons between S Corp and C Corp miss the most dangerous part of this decision for California residents: the state treats these entities completely differently, and the gap is wide.

The California Franchise Tax Differential

In California, C Corps pay an 8.84% franchise tax on net income. S Corps pay a reduced rate of just 1.5% on net income — still in addition to the federal pass-through tax. On $150,000 of taxable income, that gap is 7.34 percentage points, or $11,010 in state tax savings per year just by holding S Corp status. Over five years, that is over $55,000 in California state taxes alone.

The FTB Form 3560 Trap

When you elect S Corp status in California, filing IRS Form 2553 with the federal government is not enough. California requires a separate, simultaneous election using FTB Form 3560. If you only file the federal form and forget the state form, the FTB (Franchise Tax Board) will continue treating you as a C Corp for California purposes — billing you at 8.84% instead of 1.5% and denying your pass-through treatment.

This mistake costs California business owners an average of $8,000 to $14,000 per year in unnecessary state taxes — often for multiple years before anyone catches it. Our tax planning services include a compliance verification step specifically to catch this filing gap before it becomes a multi-year problem.

The AB 150 PTE Elective Tax — S Corp Only

California’s AB 150 Pass-Through Entity (PTE) elective tax allows S Corps to pay California state income tax at the entity level at a 9.3% rate on qualified net income. In exchange, individual shareholders get a dollar-for-dollar credit on their California personal income tax return. The federal SALT deduction cap for 2026 is $40,000, but this PTE payment happens at the business level — making it fully deductible as a business expense for federal purposes, bypassing the SALT cap entirely.

For an S Corp with $200,000 in California taxable income, the AB 150 election can generate approximately $9,200 to $12,400 in additional federal tax savings. C Corp owners cannot access this election in the same way. This alone is a strong argument for S Corp status in California.

Common Mistake: Waiting Too Long to Make the Election

The IRS gives you a specific window to elect S Corp status for a given tax year. For the election to be effective for the current tax year, Form 2553 must be filed by the 15th day of the third month of that year — which for a calendar-year corporation is March 15th. Miss that deadline and you wait another full year, paying C Corp or default LLC taxes the entire time.

The good news: the IRS allows late S Corp elections with reasonable cause under Revenue Procedure 2013-30. If your business has been operating as an LLC or C Corp but was essentially always being run as an S Corp should be (single class of stock, eligible shareholders, proper records), the IRS will often grant the late election retroactively. Many business owners who missed the window years ago are surprised to learn they can still fix it.

The Reasonable Salary Requirement You Cannot Ignore

S Corp owners who take distributions without paying themselves a reasonable salary are the IRS’s favorite audit target. The IRS requires that any S Corp shareholder-employee who provides services to the corporation receive a salary that reflects what the market would pay for those services. According to IRS S Corporation Compensation guidelines, failing to pay a reasonable salary — while taking all income as distributions — is considered an attempt to evade payroll taxes.

The audit risk is real: the IRS has won dozens of court cases on this issue, reclassifying distributions as wages and assessing back payroll taxes, penalties, and interest. The fix is simple: document your salary using comparable compensation data from BLS.gov or Salary.com for your specific role and industry. Pay yourself enough to be defensible, then take the rest as a distribution.

KDA Case Study: Sacramento Consultant Restructures from C Corp to S Corp

A Sacramento-based IT consultant came to KDA in late 2024. She had incorporated as a C Corp when she launched her business three years earlier, following generic advice from a non-tax-specialist attorney. By 2025, her business was generating $175,000 in annual net profit. She had been paying full C Corp taxes plus California franchise tax at 8.84% — and when she distributed profits to herself, those dividends were taxed again as ordinary income by California.

KDA ran a full entity analysis and identified three compounding issues: the C Corp double-taxation structure was costing her approximately $26,000 per year beyond what an S Corp would owe, she had never filed FTB Form 3560 (meaning California had no record of her wanting pass-through treatment), and she had no payroll structure at all, exposing her to a potential IRS reclassification audit.

KDA executed a late S Corp election under Rev. Proc. 2013-30, filed both Form 2553 and FTB Form 3560 concurrently, set up a defensible $82,000 reasonable salary through proper payroll, and helped her access the AB 150 PTE elective tax for the 2025 California tax year. The result: her total 2025 tax liability dropped from an estimated $81,400 under the old structure to $53,700 under the new one — a first-year saving of $27,700 on a $4,200 engagement, a 6.6x return on investment.

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: Side-by-Side Comparison

Factor	S Corporation	C Corporation
Federal Income Tax	Pass-through to owners (no entity tax)	21% flat corporate rate
California Franchise Tax	1.5% of net income	8.84% of net income
Double Taxation	No — income flows through once	Yes — taxed at entity then personal level
Self-Employment Tax	Only on reasonable salary	Not applicable — payroll taxes on W-2 only
QBI Deduction (20%)	Yes — eligible for shareholders	No — C Corp profits not QBI eligible
AB 150 PTE Election	Available — bypasses SALT cap	Not available in same manner
QSBS Exclusion (IRC §1202)	Not eligible	Eligible for startup exit planning
Shareholder Limit	Max 100 shareholders	Unlimited shareholders
Investor / VC Compatibility	Limited — one class of stock only	Preferred — supports multiple stock classes
Ideal For	Profitable small businesses, consultants, LLCs earning $60K+	Startups seeking VC, companies retaining earnings

Who Should Choose S Corp vs. C Corp in 2026

Choose S Corp status if:

• Your business net profit consistently exceeds $60,000 per year
• You are the primary service provider in your business (consultant, contractor, professional)
• You want to access the QBI deduction and AB 150 PTE election
• You have fewer than 100 shareholders and only one class of stock
• You are not planning a venture-backed fundraise in the near term

Consider keeping or electing C Corp status if:

• You are planning to raise institutional VC or angel investment requiring preferred stock
• You plan to hold qualifying stock for 5+ years and want the QSBS exclusion under IRC Section 1202
• Your business retains significant earnings for reinvestment rather than distributing to shareholders
• You need foreign shareholders or more than 100 shareholders

For the majority of California small business owners, the calculus is straightforward: S Corp status will save more money, year after year, with fewer structural complications. The exceptions are real but rare.

What to Do Before Making the Election

Before you file Form 2553, there are four steps that will determine whether your S Corp election saves you money or creates new problems:

1. Determine your reasonable salary — Use BLS.gov occupational data for your specific role and metro area. Document your research before payroll begins.
2. Set up payroll — S Corp owners must run payroll. This means federal and California withholdings, quarterly deposits, W-2s, and DE 9 filings with the California Employment Development Department (EDD).
3. File both Form 2553 and FTB Form 3560 — Never assume filing with the IRS automatically registers your election with California. File both forms simultaneously.
4. Confirm your AB 150 eligibility and opt-in — The PTE election is made on Form 3893 and must be made by the original due date of the return. Your tax advisor must include this proactively — it is not automatic.

What If I Already Have an LLC — Do I Need to Form a New Corporation?

No. One of the most misunderstood facts about S Corp elections is that you do not need to dissolve your LLC and form a new corporation to get S Corp tax treatment. An LLC can elect to be taxed as an S Corp by filing Form 8832 (to be treated as a corporation) followed by Form 2553 (to elect S Corp status). Many California LLCs add S Corp treatment every year without changing their legal entity structure at all. The operating agreement, the EIN, the bank accounts — none of that changes. Only the IRS tax classification changes.

Will an S Corp Election Trigger an Audit?

No — simply electing S Corp status does not trigger an audit. What triggers an IRS audit is taking no salary as an S Corp shareholder-employee while reporting significant distributions, or taking a salary far below what the market would pay for your role. According to IRS audit data, S Corps with zero wages on officer W-2s are flagged for review at significantly higher rates than those with reasonable compensation on record. The election itself is routine. The salary structure is where discipline matters.

Book Your Entity Strategy Session

If you are still operating as a C Corp — or as an LLC without an S Corp election — and your business is generating more than $60,000 in annual net profit, you are almost certainly overpaying taxes. The math in this guide is not a projection. It is the difference between a tax strategy and no strategy at all.

Our team at KDA will run your full entity comparison, calculate your actual estimated savings under an S Corp election, and execute the FTB Form 3560 and AB 150 PTE filing correctly the first time. Most clients see their engagement fee returned within the first 60 days of the restructure. Click here to book your entity tax strategy session now.

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

Mic Drop: The IRS does not penalize you for paying less in taxes — it only penalizes you for doing it wrong. The S Corp election is 100% legal, fully documented in the tax code, and something the IRS fully expects profitable business owners to use.