A business owner in Riverside told us last month that her CPA never mentioned the S Corp vs C Corp decision could cost her $56,000 a year. She had been filing as a C Corp for four years. Her total overpayment by the time we corrected it: $187,000 in taxes she never owed. That is not an outlier. Across hundreds of client engagements, we see this mistake repeated by owners who earn between $150,000 and $500,000 in annual profit and never received a side-by-side comparison of the two entity structures.

This information is current as of April 3, 2026. Tax laws change frequently. Verify updates with the IRS or FTB if reading this later.

Quick Answer

For most California business owners earning $80,000 or more in annual profit, the S Corp saves between $8,000 and $56,000 per year compared to the C Corp. The savings come from eliminating double taxation, reducing self-employment tax exposure, and unlocking the permanent 20% QBI deduction under the One Big Beautiful Bill Act (OBBBA). The C Corp wins in only three narrow scenarios: raising venture capital, pursuing Section 1202 QSBS exclusion, or retaining large amounts of profit at the flat 21% federal rate.

How S Corp vs C Corp Taxation Actually Works Under 2026 Rules

The core difference between an S Corp and a C Corp comes down to one word: pass-through. An S Corporation (a business that files IRS Form 2553 to elect pass-through status under Subchapter S of the Internal Revenue Code) sends its profits directly to the owner’s personal tax return. The business itself pays no federal income tax. A C Corporation (the default corporate structure under Subchapter C) pays income tax at the corporate level and then the owner pays tax again when profits are distributed as dividends. That is double taxation, and it is the single largest reason the C Corp costs more for most owners.

The Double Taxation Math on $200,000 in Profit

Here is a side-by-side comparison at $200,000 in net business profit for a California owner:

Tax Layer	S Corp	C Corp
Federal Corporate Tax (21%)	$0	$42,000
California Franchise Tax	$3,000 (1.5%)	$17,680 (8.84%)
Federal Individual Tax on Pass-Through Income	$33,244	$0 (until distributed)
Federal Tax on Dividends (20% qualified rate)	$0	$28,064
California Tax on Dividends (13.3% top rate)	$0	$18,685
Net Investment Income Tax (3.8%)	$0	$5,352
Total Combined Tax	$36,244	$111,781

That is a $75,537 gap on $200,000 in profit. Even after accounting for the S Corp owner’s reasonable salary obligation and payroll taxes, the S Corp still saves $40,000 to $56,000 annually at this income level. The C Corp only narrows the gap if the owner retains 100% of profits inside the corporation, which triggers its own trap: the accumulated earnings tax under IRC Section 531, which adds a 20% penalty tax on retained earnings above $250,000 that the IRS considers unreasonable.

What the S Corp Salary-Distribution Split Looks Like

The S Corp vs C Corp savings accelerate because of how S Corp owners split their income. An S Corp owner who earns $200,000 in profit might pay herself a reasonable salary of $80,000 and take the remaining $120,000 as a distribution. Payroll taxes (Social Security at 12.4% and Medicare at 2.9%) apply only to the $80,000 salary. That means $120,000 bypasses the 15.3% self-employment tax entirely, saving $18,360 in payroll taxes alone. A C Corp owner who takes that same $200,000 as salary pays payroll taxes on the full amount, and a C Corp owner who takes it as dividends gets hit with the double taxation shown above.

Many business owners we work with in California are stunned when they see these numbers for the first time. The s corp vs c corp decision is not academic. It is the difference between keeping $36,000 or sending $112,000 to the IRS and FTB on the same $200,000 in profit.

The Five OBBBA Changes That Reshape the S Corp vs C Corp Decision in 2026

The One Big Beautiful Bill Act (OBBBA), signed into law in 2025, permanently changed several tax provisions that directly affect how the S Corp vs C Corp comparison plays out. For a deeper dive into the full S Corp strategy landscape, see our comprehensive S Corp tax guide for California business owners.

1. Permanent QBI Deduction (Section 199A)

The Qualified Business Income deduction, which allows S Corp owners to deduct up to 20% of their pass-through business income, is now permanent. Before OBBBA, this deduction was set to expire after 2025. On $200,000 in qualifying S Corp income, the QBI deduction shelters $40,000 from federal tax, saving roughly $8,800 to $14,800 depending on your marginal rate. C Corp owners do not get this deduction because corporate profits are not pass-through income.

2. 100% Bonus Depreciation Restored

OBBBA restored 100% first-year bonus depreciation for qualifying assets. S Corp owners deduct this on their personal returns. C Corp owners deduct it on the corporate return, but the savings are partially eaten by double taxation when they eventually distribute the cash. On a $150,000 equipment purchase, the S Corp owner saves roughly $52,500 at the federal level in year one. The C Corp owner saves $31,500 at the corporate level but will lose another $15,000 to $23,000 when distributing the freed-up cash.

3. $40,000 SALT Cap

OBBBA raised the state and local tax (SALT) deduction cap from $10,000 to $40,000. This matters for S Corp owners in California who use the AB 150 Pass-Through Entity (PTE) Elective Tax. The PTE election allows the S Corp entity itself to pay California income tax, creating a dollar-for-dollar federal deduction that bypasses the SALT cap entirely. C Corp owners do not need the PTE workaround because their state taxes are deducted at the corporate level, but they still face the double taxation problem on distributions.

4. $2,500,000 Section 179 Limit

The Section 179 expensing limit increased to $2,500,000. Both S Corps and C Corps can claim this, but the after-tax benefit is larger for S Corp owners because their deduction flows through to a single layer of taxation. A C Corp owner who claims a $100,000 Section 179 deduction saves $21,000 at the federal level, but when they distribute the equivalent cash, they pay another $4,000 to $7,600 in dividend taxes.

5. Increased Standard Deduction and Bracket Adjustments

The individual standard deduction rose to $15,750 for single filers and $31,500 for joint filers. Combined with inflation-adjusted brackets, S Corp owners who report pass-through income on their personal returns benefit from wider lower brackets. C Corp owners filing personal returns only see these benefits on their salary or dividends, not on retained corporate profits. Want to see exactly how your business profit lands after all these layers? Plug your numbers into this small business tax calculator for a quick estimate.

California-Specific Traps That Make the S Corp vs C Corp Gap Even Wider

California adds multiple layers of complexity to the S Corp vs C Corp decision. Ignoring these state-level rules is how business owners lose an additional $10,000 to $25,000 per year on top of the federal gap.

Franchise Tax Differential: 1.5% vs 8.84%

California taxes S Corp net income at 1.5% through the franchise tax. C Corps pay 8.84%. On $300,000 in net income, the S Corp pays $4,500 in franchise tax while the C Corp pays $26,520. That is a $22,020 state-level gap before you even touch the federal comparison. Both entity types pay the $800 minimum franchise tax, but the percentage rate difference compounds quickly as profits grow.

California Does Not Conform to Federal Bonus Depreciation

Under California Revenue and Taxation Code Sections 17250 and 24356, California does not allow bonus depreciation. Period. Not for S Corps, not for C Corps. If you claim $200,000 in federal bonus depreciation, California forces you to add that entire amount back and depreciate it under standard MACRS schedules. This creates a dual depreciation tracking requirement and a temporary state tax increase. S Corp owners feel this through higher California pass-through income. C Corp owners feel it through higher California franchise tax. The dollar impact is proportional to profit, but S Corp owners still come out ahead because their base rate is 1.5%, not 8.84%.

The $25,000 California Section 179 Cap

While the federal Section 179 limit is $2,500,000 under OBBBA, California caps its conforming deduction at just $25,000. If you claim $500,000 in federal Section 179, California only allows $25,000. The remaining $475,000 must be depreciated over the asset’s recovery period. Again, S Corp owners absorb this at a 1.5% franchise tax rate. C Corp owners absorb it at 8.84%.

AB 150 PTE Election: The S Corp SALT Workaround

California’s AB 150 allows S Corps and partnerships to make a pass-through entity elective tax payment at a 9.3% rate. The business gets a dollar-for-dollar federal deduction, effectively bypassing the SALT cap. On $200,000 in S Corp income, the PTE election creates an $18,600 federal deduction worth roughly $4,650 to $6,882 in federal tax savings (depending on marginal rate). C Corps cannot use this election because they are not pass-through entities. This is one of the most overlooked advantages in the s corp vs c corp comparison for California owners.

KDA Case Study: Sacramento Marketing Agency Owner Discovers $47,600 Annual Overpayment

Jamal ran a digital marketing agency in Sacramento as a C Corporation. He had been filing that way since 2022 because his original attorney told him it was “safer.” His gross revenue was $620,000. After business expenses, his net profit was $285,000. He paid himself a $140,000 salary and left the rest inside the corporation.

When Jamal came to KDA, we ran a full entity analysis. His C Corp structure was costing him $47,600 per year in unnecessary taxes. Here is where the money was going:

• Federal corporate tax on $145,000 retained earnings: $30,450
• California franchise tax at 8.84% vs 1.5% on $285,000: $20,894 difference
• Lost QBI deduction on pass-through income: $11,400 in missed federal savings
• No AB 150 PTE election eligibility: $6,200 in missed SALT bypass savings
• Offset by S Corp payroll costs and compliance: ($21,344)

Net annual savings after converting to S Corp: $47,600. KDA charged $4,800 for the full conversion, including Form 2553 filing, California FTB entity transition, payroll setup, and first-year S Corp return preparation. That is a 9.9x first-year ROI.

We also helped Jamal navigate the built-in gains tax exposure under IRC Section 1374 on $78,000 in pre-conversion assets. By timing the asset disposition strategy across the five-year recognition period, he avoided $16,380 in additional BIG tax that would have hit in year one.

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 Three Narrow Scenarios Where a C Corp Actually Wins

Not every business should be an S Corp. The s corp vs c corp decision tilts toward the C Corp in exactly three situations. If you do not fall into one of these categories, the S Corp is almost certainly the better choice.

Scenario 1: Raising Venture Capital or Institutional Funding

Venture capital firms and institutional investors require multiple stock classes (preferred shares, common shares, convertible notes). S Corps are limited to one class of stock under IRC Section 1361(b)(1)(D). If you need Series A funding from a VC firm, you need a C Corp. This applies primarily to tech startups, biotech companies, and high-growth businesses seeking $1M+ in outside investment.

Scenario 2: Pursuing QSBS (Section 1202) Exclusion

Qualified Small Business Stock allows C Corp shareholders to exclude up to $10 million in capital gains (or 10x their basis, whichever is greater) when they sell shares held for five or more years. At the federal level, this can shelter millions in tax-free gains. However, California does not conform to the QSBS exclusion under R&TC Section 18152.5. California will tax 100% of your QSBS gain at up to 13.3%. So the federal benefit is real, but the California benefit is zero.

Scenario 3: Retaining Large Profits for Reinvestment

If your business generates $500,000+ in annual profit and you plan to reinvest every dollar back into the company (not distribute anything), the C Corp’s flat 21% federal rate creates a temporary deferral advantage. But “temporary” is the key word. The moment you distribute those profits as dividends, pay yourself a bonus, or sell the company, the deferred tax comes due with interest in the form of higher capital gains or dividend taxes. And California’s 8.84% franchise tax applies regardless of whether you distribute or retain.

Five Costliest S Corp vs C Corp Mistakes

After reviewing over 1,200 entity structures for California clients, these are the five mistakes that cost the most money:

Mistake 1: Defaulting to C Corp Because Your Attorney Set It Up That Way

Attorneys incorporate businesses. They do not optimize tax structures. Many owners end up as C Corps simply because the formation attorney filed Articles of Incorporation without discussing the S Corp election. This default decision costs the average owner $15,000 to $45,000 per year. The fix is straightforward: file IRS Form 2553 to elect S Corp status. If you missed the deadline, Revenue Procedure 2013-30 provides late election relief.

Mistake 2: Ignoring the Reasonable Salary Requirement

S Corp owners must pay themselves a reasonable salary before taking distributions. Setting the salary too low triggers IRS reclassification of distributions as wages, resulting in back payroll taxes, penalties, and interest. Setting it too high eliminates the self-employment tax savings that make the S Corp worthwhile. The sweet spot is typically 35% to 50% of net profit, benchmarked against industry salary data from the Bureau of Labor Statistics.

Mistake 3: Choosing C Corp for the 21% Rate Without Modeling the Full Picture

The flat 21% federal C Corp rate looks attractive in isolation. But when you add California’s 8.84% franchise tax, dividend taxes at up to 23.8% federal (20% qualified dividend rate plus 3.8% NIIT), and California’s 13.3% state tax on dividends, the effective rate on distributed profits exceeds 55%. The S Corp’s combined rate on the same income typically lands between 35% and 42% after QBI deduction and AB 150 PTE election.

Mistake 4: Failing to Convert Before the Built-In Gains Window Opens

When converting from C Corp to S Corp, IRC Section 1374 imposes a built-in gains (BIG) tax on appreciated assets sold within five years of conversion. Owners who convert without a BIG tax plan often face surprise tax bills of $20,000 to $100,000+ when they sell equipment, real estate, or receivables during the recognition period. The solution is a pre-conversion appraisal and a timed disposition strategy.

Mistake 5: Missing the AB 150 PTE Election Deadline

The PTE election must be made by the original due date of the S Corp return (March 15 for calendar-year filers) or by the extended due date if an extension is filed. Missing this deadline forfeits the entire SALT bypass benefit for the year. On $300,000 in S Corp income, that is $27,900 in PTE tax that could have generated $6,975 to $10,323 in federal savings. Our entity formation services include deadline tracking to prevent this exact mistake.

S Corp vs C Corp Decision Framework: Which Entity Fits Your Business?

Use this framework to determine which structure saves you the most money:

Decision Factor	Choose S Corp If	Choose C Corp If
Annual Profit	$60,000 to $1,000,000+	Retaining $500K+ with zero distributions
Shareholder Count	1 to 100 shareholders	More than 100 shareholders needed
Stock Classes	One class is sufficient	Multiple classes needed for investors
Funding Source	Self-funded, SBA loans, bank lines	VC, PE, or institutional capital
Exit Strategy	Sell assets or wind down	IPO or QSBS-eligible stock sale
California Tax Rate	1.5% franchise tax	8.84% franchise tax
SALT Bypass	AB 150 PTE election available	Not eligible for PTE election
QBI Deduction	Up to 20% deduction on pass-through income	Not available

Key Takeaway: If you are not raising venture capital, do not need multiple stock classes, and plan to distribute profits to yourself within the next five years, the S Corp saves you money in nearly every scenario above $60,000 in annual profit.

What If I Already Have a C Corp? How to Convert

Converting from C Corp to S Corp requires filing IRS Form 2553. The deadline is within 75 days of the start of the tax year you want the election to take effect, or at any time during the preceding tax year. If you missed that window, Revenue Procedure 2013-30 allows late elections if you can demonstrate reasonable cause and meet four specific requirements.

Step-by-Step Conversion Process

1. Run a full entity comparison with current-year profit projections, salary modeling, and California franchise tax impact
2. Verify S Corp eligibility under IRC Section 1361: 100 or fewer shareholders, all U.S. citizens or residents, one class of stock, no corporate or partnership shareholders
3. Complete IRS Form 2553 with all shareholder signatures and submit to the IRS
4. File California Form 3560 (S Corporation Election or Termination/Revocation) with the FTB
5. Obtain a BIG tax appraisal to document fair market value of all assets on the date of conversion
6. Set up payroll for reasonable officer compensation within 30 days of the effective date
7. Update bookkeeping to track shareholder basis, AAA (Accumulated Adjustments Account), and any accumulated E&P (Earnings and Profits) carried over from C Corp years
8. Make the AB 150 PTE election on the first S Corp return to activate the California SALT bypass

This process typically takes 45 to 90 days when handled correctly. The most common delay is waiting for IRS acknowledgment of the Form 2553, which can take 60 days or more.

Will Choosing S Corp Trigger an Audit?

No. Electing S Corp status does not increase your audit risk. What does increase audit risk is an unreasonably low officer salary. The IRS uses industry salary data and your company’s gross receipts to determine whether your salary is reasonable. If your S Corp earns $400,000 and you pay yourself $30,000, expect a letter. If you pay yourself $120,000 to $160,000 on that same revenue, you are well within the safe zone.

Other S Corp audit triggers include:

• Distributions that exceed shareholder basis (creates phantom taxable income)
• Failing to file Form 1120-S by the March 15 deadline (penalty is $220 per shareholder per month, up to 12 months)
• Excessive vehicle or travel deductions without mileage logs
• Claiming losses that exceed basis without proper documentation on IRS Form 7203

Pro Tip: Keep your Form 7203 (S Corporation Shareholder Stock and Debt Basis Limitations) current every year. This single form prevents the most common S Corp audit adjustment: losses claimed in excess of basis.

Frequently Asked Questions About S Corp vs C Corp

Can a single-member LLC elect S Corp status?

Yes. A single-member LLC can file Form 2553 to be taxed as an S Corp. The LLC structure remains intact for liability protection, but the IRS treats it as an S Corporation for tax purposes. This is the most common entity setup for solo business owners earning $60,000 or more in profit.

Does California charge the $800 franchise tax for both S Corps and C Corps?

Yes. Both entity types pay the $800 minimum California franchise tax. However, the S Corp’s 1.5% net income rate is dramatically lower than the C Corp’s 8.84% rate. The $800 minimum applies only when the calculated tax is less than $800.

Can I switch from S Corp back to C Corp if I change my mind?

Yes, but there is a five-year waiting period if you revoke or terminate the S election before you can re-elect. The IRS treats the revocation as effective on the date specified or the first day of the following tax year if no date is specified.

What happens to my C Corp retained earnings when I convert to S Corp?

Retained earnings from C Corp years become accumulated Earnings and Profits (E&P) on the S Corp balance sheet. Under IRC Section 1368(c), distributions are first treated as coming from the AAA (tax-free to the extent of basis), then from accumulated E&P (taxable as dividends), and finally as return of basis. Getting this ordering wrong can trigger unexpected dividend taxes.

Is the QBI deduction really permanent now?

Yes. OBBBA made the Section 199A QBI deduction permanent. S Corp owners can deduct up to 20% of qualified business income, subject to W-2 wage and qualified property limitations for specified service trades at higher income levels. The income phase-out begins at $191,950 for single filers and $383,900 for joint filers (2025 thresholds, adjusted for inflation in 2026).

“The IRS is not hiding these savings. They are sitting inside a two-page form that most business owners never file.”

Book Your S Corp vs C Corp Strategy Session

If you are running a California business as a C Corp and your annual profit exceeds $60,000, you are almost certainly overpaying taxes by $10,000 to $56,000 per year. That is not a guess. It is the math. Let our team run a free side-by-side entity comparison using your actual numbers, model the conversion timeline, and show you exactly how much you will save in year one. Click here to book your consultation now.