Most California S Corp Owners Who Reverse Their Election Lose $39,400 in Year One Alone

There is a small group of California S Corp owners who genuinely benefit from revoking their S election and becoming a C Corporation. They represent roughly 3 to 5 percent of the business owners we consult with each year. The other 95 percent who change S Corp to C Corp do it for the wrong reasons, at the wrong time, and with zero understanding of the tax consequences waiting on the other side.

That gap between perception and reality costs real money. On $200,000 in business profit, the structural tax difference between an S Corp and a C Corp in California can exceed $39,400 annually once you account for federal double taxation, the California franchise tax swing from 1.5% to 8.84%, and the permanent loss of the Qualified Business Income deduction under IRC Section 199A.

This guide breaks down exactly when changing your S Corp to a C Corp makes strategic sense, when it is a financial disaster, and the precise steps required under both federal and California law to execute the conversion without triggering penalties you never saw coming.

Quick Answer

Changing from an S Corp to a C Corp means revoking your S election with the IRS, which subjects your business to corporate-level income tax (21% federal plus 8.84% California) and dividend double taxation when you pull profits out. For the vast majority of California business owners earning between $80,000 and $500,000 in profit, this switch costs $15,000 to $50,000 or more per year in additional taxes. Only a narrow set of circumstances, such as seeking venture capital funding, pursuing QSBS eligibility under Section 1202, or needing multiple share classes, justify this conversion.

Why California S Corp Owners Consider the Switch to C Corp

The conversation usually starts in one of three places. Either a business owner reads online advice about the flat 21% federal C Corp rate and assumes it is lower than what they are paying now, their attorney recommends C Corp status for equity fundraising purposes, or they want fringe benefits like employer-paid health insurance that S Corp shareholders owning more than 2% cannot receive tax-free under IRC Section 1372.

The 21% Rate Illusion

The most common reason business owners explore converting to a C Corp is the perceived tax rate advantage. The Tax Cuts and Jobs Act set the federal corporate tax rate at a flat 21%, which sounds significantly lower than the top individual rate of 37%. But this comparison ignores two critical layers.

First, the 21% rate only applies at the corporate level. The moment you take money out of the C Corp as a dividend, you pay a second layer of tax. Qualified dividends are taxed at 15% to 23.8% federally (including the 3.8% Net Investment Income Tax under IRC Section 1411). In California, dividends are taxed as ordinary income at rates up to 13.3%, because California does not offer a preferential rate for qualified dividends.

Second, S Corp owners who qualify for the QBI deduction under IRC Section 199A effectively reduce their federal tax rate by up to 20% on qualified business income. C Corp shareholders do not qualify for QBI. That deduction alone can be worth $8,000 to $20,000 per year on moderate business income.

The Venture Capital and Equity Argument

Venture capital firms almost universally require C Corp status. S Corps are limited to 100 shareholders under IRC Section 1361(b)(1)(A), cannot issue preferred stock or multiple share classes, and cannot have non-resident alien shareholders. If you are raising institutional funding rounds, converting to a C Corp is not optional. It is a requirement.

But here is the distinction that matters: if you are not raising venture capital, this reason does not apply to you. Many business owners confuse the needs of Silicon Valley startups with the needs of a profitable service business generating $150,000 to $500,000 in annual profit. Those are two completely different tax universes.

Fringe Benefits and Health Insurance

S Corp shareholders who own more than 2% of the company cannot receive employer-paid health insurance as a tax-free fringe benefit. The premiums are included in their W-2 income under IRC Section 1372. C Corp shareholder-employees, by contrast, can receive these benefits tax-free under IRC Section 106.

The annual value of this benefit typically ranges from $6,000 to $12,000 for a family plan. That is real savings, but it rarely offsets the $25,000 to $50,000 in additional tax created by double taxation on everything else. You need to run the full comparison, not just look at one line item.

The Real Tax Math: S Corp vs C Corp at Three Income Levels

The numbers tell the story better than any theory. Here is what happens to your total tax bill when you change S Corp to C Corp at three common California income levels, assuming you take all after-tax profits as distributions or dividends.

At $100,000 in Business Profit

As an S Corp, you pay yourself a reasonable salary of $50,000 and take $50,000 as a distribution. Your combined federal and California tax on the salary and pass-through income, after the QBI deduction, totals approximately $24,800. As a C Corp, the corporation pays $29,840 in combined federal and California corporate tax (21% plus 8.84%). When you distribute the remaining $70,160 as a dividend, you pay an additional $14,735 in combined federal and California personal tax. Your total C Corp tax bill: approximately $44,575. The S Corp advantage: $19,775 per year.

At $200,000 in Business Profit

As an S Corp with a $75,000 reasonable salary, your combined tax after QBI totals approximately $51,200. As a C Corp, corporate-level tax is $59,680 and dividend-level tax on the remaining $140,320 adds $29,467. Total C Corp tax: approximately $89,147. The S Corp advantage: $37,947 per year. Want to see how these numbers play out with your specific income? Run your figures through this small business tax calculator to estimate your actual tax liability under each structure.

At $350,000 in Business Profit

As an S Corp with a $110,000 reasonable salary, your combined tax after QBI totals approximately $98,600. As a C Corp, corporate-level tax is $104,440 and dividend-level tax on $245,560 adds approximately $58,929. Total C Corp tax: approximately $163,369. The S Corp advantage: $64,769 per year.

Side-by-Side Comparison Table

Factor	S Corp	C Corp
Federal Entity Tax Rate	0% (pass-through)	21%
California Entity Tax Rate	1.5% net income	8.84% net income
QBI Deduction (IRC 199A)	Up to 20% deduction	Not eligible
Dividend Double Taxation	None (distributions)	15%-23.8% federal + 13.3% CA
AB 150 PTE Election	Eligible	Not eligible
Tax on $200K Profit (CA)	~$51,200	~$89,147
Annual Difference	$37,947 S Corp advantage

The Five Costliest Mistakes When You Change S Corp to C Corp

Mistake 1: Ignoring the Built-In Gains Tax in Reverse

When you convert from S Corp to C Corp, you do not face the traditional built-in gains (BIG) tax under IRC Section 1374, because that applies to C-to-S conversions. However, you face a different problem. Any appreciated assets inside the S Corp at the time of revocation will eventually be taxed at C Corp rates when sold. If your S Corp holds real estate, equipment, or intellectual property with significant built-in gain, you just locked those gains into double taxation permanently.

Mistake 2: Failing to Distribute Accumulated Adjustments Account (AAA) Before Revocation

Your S Corp’s Accumulated Adjustments Account, known as the AAA, represents previously taxed but undistributed S Corp earnings. Once you revoke the S election, distributions from the AAA are still tax-free, but only during the post-termination transition period (PTTP) under IRC Section 1371(e). That window is generally one year after the revocation date or the due date of the last S Corp return, whichever is later. Miss this window, and those distributions become taxable dividends. On a $150,000 AAA balance, that mistake costs roughly $31,500 in unnecessary dividend tax.

Mistake 3: Not Understanding the Revocation Mechanics

Revoking an S election is not just filing a form. Under IRC Section 1362(d)(1), you need the consent of shareholders holding more than 50% of all outstanding shares (voting and non-voting). The revocation must be filed as a statement with the IRS Service Center where you file your return. If filed during the first two and a half months of the tax year (by March 15 for calendar-year corporations), the revocation takes effect on January 1 of that year. File it after March 15, and it takes effect on January 1 of the following year, unless you specify a prospective date. Getting the timing wrong creates a split tax year, which requires filing both Form 1120-S and Form 1120 for the same tax year.

Mistake 4: Overlooking California’s Separate Revocation Requirements

California requires a separate revocation filing with the Franchise Tax Board. Simply filing the federal revocation does not automatically revoke your California S Corp status. You must file a statement with the FTB, and you will begin filing Form 100 (California Corporation Franchise or Income Tax Return) instead of Form 100S. The franchise tax rate jumps from 1.5% to 8.84% of net income, and you lose eligibility for the AB 150 Pass-Through Entity (PTE) tax election, which allows S Corp shareholders to bypass the $40,000 SALT cap under the One Big Beautiful Bill Act. For a California shareholder with $200,000 in pass-through income, losing the PTE election can cost $6,000 to $10,000 per year in additional federal tax.

Mistake 5: Converting Without Modeling the Five-Year Tax Impact

Most business owners who change S Corp to C Corp only look at year one. They see the flat 21% corporate rate and stop calculating. But over five years, the compounding effect of double taxation, lost QBI deductions, lost PTE election benefits, and increased California franchise tax creates a cumulative loss that often exceeds $150,000 to $300,000. If you are not running a five-year projection with a qualified tax strategist, you are making a six-figure decision with a one-year calculator.

KDA Case Study: Sacramento Tech Founder Avoids $197,000 Five-Year Loss

Marcus, a Sacramento-based software development firm owner, came to KDA after his business attorney recommended converting his S Corp to a C Corp in preparation for a future funding round. His firm generated $280,000 in annual profit with no immediate plans to raise venture capital. The attorney’s logic was simple: “C Corps are better for growth companies.”

Our team ran a comprehensive five-year tax projection comparing his current S Corp structure against the proposed C Corp conversion. The results were decisive. Marcus was paying approximately $74,500 per year in combined federal and California taxes as an S Corp. Under C Corp status, his projected annual tax bill jumped to $113,900 once corporate-level tax, dividend taxation, lost QBI deduction, and lost AB 150 PTE election were factored in. That is a $39,400 annual increase, or $197,000 over five years.

Instead of converting, KDA implemented three alternative strategies. First, we restructured Marcus’s reasonable salary to optimize his self-employment tax savings. Second, we established a Solo 401(k) with a $69,000 annual contribution, reducing his taxable income by an additional $69,000. Third, we filed the AB 150 PTE election to recover $8,200 in federal tax that was being lost to the SALT cap. Total engagement cost: $8,500. First-year tax savings versus the proposed C Corp conversion: $47,600. ROI: 5.6x in year one, with projected savings of $238,000 over five years.

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 Changing to C Corp Actually Makes Sense

For a deeper understanding of the S Corp structure and when it works best, explore our comprehensive guide to S Corp tax strategy in California. That said, here are the three specific situations where a C Corp conversion is strategically justified.

Scenario 1: Active Venture Capital Fundraising

If you are in active discussions with institutional investors and have a term sheet or letter of intent, converting to a C Corp is typically a prerequisite. VC firms need preferred stock, multiple share classes, and the ability to bring in foreign investors, none of which an S Corp permits. In this case, the tax cost of C Corp status is an investment in growth capital. But “someday I might raise money” is not a sufficient reason to convert. Convert when the funding is real, not theoretical.

Scenario 2: QSBS Eligibility Under IRC Section 1202

Qualified Small Business Stock rules allow shareholders of eligible C Corps to exclude up to $10 million in capital gains (or 10 times their basis) when they sell stock held for five or more years. The business must be a domestic C Corporation with gross assets under $50 million. If you are building a company with a realistic exit value above $5 million and plan to hold for five-plus years, the potential $10 million exclusion can dwarf the annual double-taxation cost. But note: QSBS eligibility requires the stock to be acquired at original issuance from a C Corp, so converting from an S Corp requires careful structuring to avoid disqualification.

Scenario 3: Full Profit Retention with No Distributions

If your business retains 100% of its profits for reinvestment and you take no dividends or distributions for five or more years, C Corp status at a flat 21% federal rate can be cheaper than pass-through taxation at rates up to 37%. This only works if you genuinely do not need the money. The moment you pull profits out as dividends, double taxation kicks in and erases the rate advantage. Also, be warned: the accumulated earnings tax under IRC Section 531 imposes a 20% penalty tax on C Corps that retain earnings beyond reasonable business needs. The IRS generally considers anything above $250,000 in accumulated earnings as potentially subject to this penalty.

How to Properly Change S Corp to C Corp: 8-Step Process

If you have determined that C Corp status is genuinely in your best interest, here is the exact process to execute the conversion without creating unnecessary tax liability. Our entity formation services team handles this process regularly for clients making this transition.

Step 1: Run the Five-Year Tax Projection

Before filing anything, model the tax consequences for at least five years under both S Corp and C Corp status. Include federal tax, California franchise tax, QBI deduction impact, AB 150 PTE election value, and dividend taxation on projected distributions.

Step 2: Maximize Your AAA Distributions

Distribute as much of your Accumulated Adjustments Account as possible before the revocation takes effect. These distributions are tax-free under IRC Section 1368(c) while you are still an S Corp. After revocation, you have a limited window during the PTTP to make additional tax-free AAA distributions, but the safer approach is to distribute before the effective date.

Step 3: Obtain Shareholder Consent

Prepare a written consent statement signed by shareholders holding more than 50% of all outstanding shares. The statement must include the corporation name, EIN, the number of shares outstanding, the date the revocation is intended to take effect, and each consenting shareholder’s signature, share count, and date of consent.

Step 4: File the Federal Revocation Statement

Send the consent statement to the IRS Service Center where you file your tax return. There is no specific IRS form for this. Include a cover letter referencing IRC Section 1362(d)(1) and specifying the effective date. If you file by March 15, the revocation takes effect January 1 of the current year. If you file after March 15 without specifying a future date, it takes effect January 1 of the following year.

Step 5: File the California Revocation with FTB

Submit a separate revocation statement to the California Franchise Tax Board. Update your California filing obligations from Form 100S to Form 100. Confirm the effective date aligns with your federal revocation.

Step 6: Address the Split-Year Return (If Applicable)

If the revocation takes effect mid-year, you must file a short-period Form 1120-S for the S Corp portion and a short-period Form 1120 for the C Corp portion. California requires corresponding short-period Form 100S and Form 100 filings. Allocate income between the two periods using either the specific allocation method or the pro-rata daily allocation method under IRC Section 1362(e)(2).

Step 7: Restructure Compensation and Benefits

As a C Corp shareholder-employee, update your employment arrangement to take advantage of fringe benefits under IRC Section 106 (health insurance), IRC Section 127 (educational assistance), and IRC Section 132 (various fringe benefits). Establish or adjust your retirement plan contributions to reflect C Corp rules.

Step 8: Set Up C Corp Tax Compliance Systems

Implement estimated tax payments using Form 1120-W. California C Corps must make estimated payments using Form 100-ES. Establish a dividend distribution schedule that accounts for both corporate and individual tax layers. Track earnings and profits (E&P) under IRC Section 312 meticulously, as this determines the tax treatment of future distributions.

OBBBA Permanent Changes That Widen the S Corp Advantage

The One Big Beautiful Bill Act made several permanent changes that further tilt the math against converting from S Corp to C Corp for most California business owners.

Permanent QBI Deduction

The 20% QBI deduction under IRC Section 199A, originally set to expire after 2025, is now permanent. This exclusively benefits pass-through entity owners, including S Corp shareholders. C Corp shareholders receive zero benefit. On $200,000 in qualified business income, this deduction saves approximately $8,000 to $10,000 annually. Over a decade, that is $80,000 to $100,000 in savings you permanently forfeit by converting to C Corp status.

100% Bonus Depreciation Restored

OBBBA restored 100% first-year bonus depreciation for qualifying assets. While both S Corps and C Corps can claim this deduction at the entity level, S Corp shareholders benefit from the pass-through deduction reducing their individual taxable income. C Corp shareholders only benefit indirectly through increased retained earnings, which are then subject to double taxation when distributed. Also note: California does not conform to federal bonus depreciation under Revenue and Taxation Code Sections 17250 and 24356, so California business owners must maintain dual depreciation schedules regardless of entity type.

$40,000 SALT Cap

The SALT deduction cap increased from $10,000 to $40,000, but it still limits the benefit of state tax deductions for individual filers. S Corp shareholders can bypass this cap entirely through the AB 150 PTE election, which allows the entity to pay California tax at the entity level and receive a dollar-for-dollar federal tax credit. C Corps are not eligible for the PTE election. This single difference can be worth $6,000 to $15,000 annually for California S Corp shareholders.

$2.5 Million Section 179 Cap

The enhanced Section 179 expensing limit benefits both entity types equally at the federal level. However, California caps its Section 179 deduction at $25,000 under R&TC Section 17255, creating another dual-schedule tracking requirement.

What If You Already Changed S Corp to C Corp and Regret It?

If you have already revoked your S election and want to reverse course, there is a significant roadblock. Under IRC Section 1362(g), once an S election is revoked or terminated, the corporation cannot re-elect S Corp status for five tax years without IRS consent. The IRS can waive this waiting period under IRC Section 1362(g) if the circumstances causing the termination are corrected and the corporation is not reasonably expected to terminate again. In practice, obtaining this waiver requires a Private Letter Ruling (PLR), which costs approximately $15,300 in user fees and takes 6 to 12 months to process.

Damage Reduction Strategies During the Five-Year Wait

If re-election is not immediately possible, focus on minimizing the double taxation burden. Maximize deductible compensation to reduce taxable corporate income. Establish a defined benefit pension plan, which allows deductible contributions of $265,000 or more per year for older business owners. Utilize the fringe benefits available to C Corp shareholder-employees. Avoid distributions and let retained earnings compound at the 21% corporate rate until you can re-elect S Corp status.

Can You Reverse the Revocation Before It Takes Effect?

Yes, under certain circumstances. If the revocation specifies a future effective date and that date has not yet arrived, the corporation can rescind the revocation with the consent of all shareholders who originally consented, plus any shareholders who did not consent. The rescission must be filed before the effective date. Once the effective date passes, the revocation is irreversible without going through the five-year waiting period.

Will This Conversion Trigger an Audit?

Entity classification changes do not automatically trigger an IRS audit. However, the transition year creates additional scrutiny points. The IRS reviews the allocation of income and deductions between the S Corp and C Corp portions of a split year carefully. California’s Franchise Tax Board also examines entity conversions for proper franchise tax calculation. The IRS Palantir SNAP AI system now cross-references entity classification changes with income reporting patterns, so any inconsistencies between your Form 1120-S, Form 1120, and individual Form 1040 will be flagged automatically.

Frequently Asked Questions About Changing S Corp to C Corp

How long does it take to change S Corp to C Corp?

The revocation itself takes effect on the date specified in your filing. If filed by March 15, it can be retroactive to January 1. Processing time at the IRS is typically 60 to 90 days for acknowledgment, but the effective date is based on your filing, not IRS processing.

Do I need to form a new corporation to change from S Corp to C Corp?

No. An S Corp and a C Corp are the same legal entity. The S election is simply a tax classification. Revoking the S election changes the tax treatment without affecting the corporate structure, articles of incorporation, EIN, or bank accounts.

What forms do I file after converting to a C Corp?

Federally, you file Form 1120 (U.S. Corporation Income Tax Return) instead of Form 1120-S. In California, you file Form 100 instead of Form 100S. Your personal Schedule K-1 disappears, and you report dividend income on Schedule B and Form 1040 instead.

Can my accountant handle this conversion, or do I need a tax strategist?

Your accountant can file the paperwork. But whether you should convert in the first place is a strategic question that requires modeling, not just compliance. The filing is simple. The decision is complex. Getting the filing right but making the wrong strategic choice is far more expensive than any filing error.

Is there a fee to revoke the S election?

There is no IRS filing fee to revoke an S election. However, if you later want to re-elect S Corp status within the five-year restriction period, the Private Letter Ruling costs approximately $15,300 in user fees.

What happens to my payroll and reasonable salary requirement?

C Corp shareholder-employees still must receive reasonable compensation for services performed. The IRS examines C Corp compensation from the opposite direction: instead of looking for salary that is too low (the S Corp concern under Watson v. Commissioner), the IRS scrutinizes C Corp compensation for being unreasonably high, since excessive compensation reduces corporate taxable income. This is codified under IRC Section 162(a)(1).

This information is current as of 4/15/2026. Tax laws change frequently. Verify updates with the IRS or FTB if reading this later.

Book Your Entity Structure Review

If someone has told you that converting your S Corp to a C Corp will save you money, get a second opinion before you file anything irreversible. The difference between the right entity and the wrong one is often $30,000 to $65,000 per year in California. Our team will run a comprehensive five-year tax projection under both structures and show you the exact dollar impact before you make a decision you cannot undo for five years. Click here to book your entity structure review now.