S Corp Versus LLC: Why the Default Election Is Draining $15,800 a Year From California Business Owners Who Never Ran the Numbers

A Sacramento-based freelance web developer earned $185,000 last year through her single-member LLC. She paid every dollar of self-employment tax the IRS asked for. She never questioned it. She assumed her LLC was “the right structure” because her attorney set it up that way three years ago. She was wrong by $15,800.

That $15,800 is the annual gap between what she paid in self-employment tax as a default LLC and what she would have paid if she had elected S Corp status on that same LLC. No new entity. No new EIN. Just one IRS form that changed how her income gets taxed. The **s corp versus llc** decision is not about which entity is “better.” It is about which tax election matches your income level, your profession, and your willingness to run payroll. Most California business owners never run that comparison, and the IRS is perfectly happy to keep collecting the difference.

Quick Answer: S Corp Versus LLC Tax Treatment in 30 Seconds

A default single-member LLC passes all net income to your personal return and charges 15.3% self-employment tax (Social Security at 12.4% plus Medicare at 2.9%) on every dollar of profit. An S Corp, which can be elected by that same LLC using IRS Form 2553, splits your income into two buckets: a reasonable W-2 salary (subject to payroll taxes) and remaining profit distributions (not subject to self-employment tax). At $150,000 or more in annual profit, this split routinely saves California owners $10,000 to $25,000 per year in payroll and self-employment taxes alone, before layering in the QBI deduction, AB 150 PTE election, and California franchise tax differences.

How the Default LLC Tax Structure Quietly Bleeds You Dry

When you form an LLC in California and do nothing else, the IRS treats your business as a “disregarded entity.” That is a technical way of saying the IRS pretends your LLC does not exist for tax purposes. All of your business revenue and expenses flow directly to Schedule C on your personal Form 1040. Every dollar of net profit gets hit with two separate tax layers.

Layer 1: Self-Employment Tax on Every Dollar

Under IRC Section 1401, you owe 15.3% self-employment tax on your first $168,600 of net self-employment income (2026 threshold). Above that amount, you still owe the 2.9% Medicare portion with no cap. On $200,000 of LLC profit, that means $24,225 in self-employment tax before your federal income tax even enters the picture.

Layer 2: Federal and California Income Tax

After self-employment tax, your LLC profit also gets taxed at your ordinary federal income tax rate (up to 37%) plus California’s rate (up to 13.3% under R&TC Section 17041). Combined with the SE tax, a default LLC owner at $200,000 profit in California can face an effective rate north of 45%.

Layer 3: The California LLC Fee Nobody Warns You About

California charges a graduated LLC fee based on gross revenue under R&TC Section 17942. If your LLC generates between $250,000 and $499,999 in total revenue, you owe an $800 annual franchise tax plus a $900 LLC fee. Between $500,000 and $999,999, the fee jumps to $2,500. This fee applies regardless of profit, and it stacks on top of everything else. Many business owners do not realize this fee exists until their FTB bill arrives.

If you want to see exactly how much self-employment tax your LLC income generates, run your numbers through this self-employment tax calculator to get a clear picture before making any election decisions.

What Changes When Your LLC Elects S Corp Status

Filing IRS Form 2553 does not dissolve your LLC. It does not change your state registration, your contracts, your bank accounts, or your operating agreement. It changes one thing: how the IRS taxes the money flowing through your business. That single change unlocks five distinct advantages that compound every year.

Advantage 1: The Salary-Distribution Split

As an S Corp, you pay yourself a reasonable W-2 salary and take remaining profit as distributions. Only your salary is subject to payroll taxes (the employer and employee shares of Social Security and Medicare, totaling 15.3% on amounts up to $168,600). Distributions above that salary are not subject to self-employment tax at all.

Here is the math at $200,000 profit with a $95,000 reasonable salary:

• Default LLC self-employment tax: $24,225 (15.3% on $158,414 after the 92.35% calculation, plus 2.9% on remainder)
• S Corp payroll tax on $95,000 salary: $14,535 (15.3% combined employer/employee FICA)
• S Corp payroll tax on $105,000 distribution: $0
• Annual savings from the split alone: $9,690

That $9,690 is just the self-employment tax savings. It does not include the QBI deduction advantage or the AB 150 PTE bypass.

Advantage 2: The QBI Deduction Under Permanent IRC Section 199A

The One Big Beautiful Bill Act (OBBBA) made the Qualified Business Income deduction permanent. S Corp owners can deduct up to 20% of their qualified business income from their federal taxable income. At $200,000 profit with a $95,000 salary, your QBI is the $105,000 distribution. Twenty percent of that is a $21,000 deduction, saving roughly $5,040 in federal tax at the 24% bracket.

Default LLC owners can also claim QBI, but their entire net income counts as QBI, which sounds better until you realize that income also gets crushed by self-employment tax. The S Corp structure optimizes both sides of the equation.

Advantage 3: AB 150 PTE Election for SALT Cap Bypass

California’s AB 150 Pass-Through Entity tax election allows S Corps to pay state income tax at the entity level, generating a dollar-for-dollar federal tax credit that bypasses the $40,000 SALT deduction cap (made permanent under OBBBA). On $105,000 of pass-through income, this election can save an additional $3,000 to $5,000 depending on your bracket. Default LLCs taxed as disregarded entities cannot use this election because there is no “entity” to elect through. For a deeper breakdown of how this works alongside reasonable salary rules, read our comprehensive S Corp tax strategy guide.

Advantage 4: California Franchise Tax Differential

A default LLC pays the $800 minimum franchise tax plus the graduated LLC fee. An LLC taxed as an S Corp pays a 1.5% tax on net income with an $800 minimum. At lower income levels, the S Corp’s 1.5% can actually cost slightly more. But at $200,000 profit, the S Corp pays $3,000 in California franchise tax (1.5% of $200,000). The default LLC pays $800 plus the applicable LLC fee. The difference narrows here, but the federal savings from advantages 1 through 3 overwhelm any marginal California cost increase.

Advantage 5: OBBBA Bonus Depreciation with California Nonconformity Management

OBBBA restored 100% bonus depreciation permanently under IRC Section 168(k). S Corp owners who purchase equipment, vehicles, or other qualifying assets can write off the full cost in year one federally. California does not conform to federal bonus depreciation under R&TC Sections 17250 and 24356, so you must maintain dual depreciation schedules. The S Corp structure makes this tracking cleaner because your entity-level return (Form 1120-S) handles the federal side while your California adjustments flow through the K-1.

Side-by-Side Comparison: S Corp Versus LLC at Three Income Levels

Factor	Default LLC ($100K Profit)	S Corp ($100K Profit)	Default LLC ($200K Profit)	S Corp ($200K Profit)	Default LLC ($300K Profit)	S Corp ($300K Profit)
SE/Payroll Tax	$14,130	$8,415 (on $55K salary)	$24,225	$14,535 (on $95K salary)	$27,935	$18,360 (on $120K salary)
QBI Deduction Value	$4,400	$2,160 (on $45K QBI)	$9,600	$5,040 (on $105K QBI)	$14,400	$8,640 (on $180K QBI)
AB 150 PTE Savings	$0	$1,200	$0	$3,800	$0	$6,200
CA Franchise Tax	$800	$1,500	$1,700	$3,000	$2,500	$4,500
Net Annual Tax Advantage	S Corp saves $7,815		S Corp saves $15,830		S Corp saves $23,675

These numbers assume single filer, California resident, no other income sources, and reasonable salary benchmarks from BLS occupational data. Your actual savings will vary based on profession, filing status, and total household income.

The Five Costliest Mistakes When Choosing S Corp Versus LLC

Mistake 1: Staying a Default LLC Past the $60,000 Profit Threshold

The S Corp election creates administrative costs: payroll processing ($50 to $150 per month), an additional Form 1120-S filing ($500 to $2,000 in preparation fees), and quarterly payroll tax deposits. Below $60,000 in annual profit, these costs can eat most of the self-employment tax savings. Above $60,000, the math tilts decisively toward S Corp. Every year you delay past that threshold is a year of unnecessary tax payments.

Mistake 2: Setting Your Salary Too Low

The IRS has no fixed salary formula, but they absolutely audit S Corp owners who pay themselves suspiciously low wages. In Watson v. Commissioner (T.C. Memo 2012-167), the Tax Court reclassified distributions as wages when the owner’s salary did not reflect the value of services performed. If you earn $200,000 in profit and pay yourself a $30,000 salary, the IRS will reclassify a significant portion of your distributions as wages, assess back payroll taxes, add late deposit penalties under IRC Section 6656, and potentially layer on an accuracy-related penalty under IRC Section 6662. A defensible salary typically falls between 40% and 60% of total profit, supported by industry salary data from the Bureau of Labor Statistics.

Mistake 3: Missing the March 15 Form 2553 Deadline

To elect S Corp status for the current tax year, you must file Form 2553 by March 15 of that year (for calendar-year taxpayers). Miss that date, and your election does not take effect until the following January 1. That means 12 more months of full self-employment tax. Late election relief exists under Rev. Proc. 2013-30, but it requires meeting five specific conditions, including filing within three years and 75 days of the intended effective date and demonstrating reasonable cause.

Mistake 4: Forgetting California FTB Form 3560

The IRS does not notify California when you file Form 2553. You must separately file FTB Form 3560 with the California Franchise Tax Board. Without this form, California may continue treating your LLC as a disregarded entity, meaning you lose the AB 150 PTE election, pay the wrong franchise tax rate, and face FTB correspondence audits that waste months of your time.

Mistake 5: Ignoring the California Depreciation Nonconformity

Under R&TC Sections 17250 and 24356, California does not follow federal bonus depreciation. If you deduct $150,000 of equipment using 100% bonus depreciation on your federal return but do not maintain a separate California depreciation schedule using MACRS or Section 179 (which California does conform to), you will either overstate your California deductions or understate them. Both scenarios create FTB audit exposure. Every S Corp owner must run dual depreciation schedules from day one.

When the Default LLC Actually Wins Over S Corp

The S Corp election is not universally superior. Three scenarios favor keeping the default LLC structure:

Scenario 1: Net Losses or Startup Phase

If your business is generating net losses, there are no self-employment tax savings to capture. The S Corp’s payroll requirement means you would need to pay yourself a salary even when the business is not profitable, creating unnecessary payroll tax obligations. Stay as a default LLC until you have consistent profitability above $60,000.

Scenario 2: Real Estate Rental Income

Rental income from real estate is generally not subject to self-employment tax anyway under IRC Section 1402(a)(1). Placing rental properties in an S Corp also complicates 1031 exchanges, eliminates the stepped-up basis benefit at death, and can trigger Built-In Gains tax issues. Most real estate investors should use LLCs taxed as partnerships or disregarded entities, not S Corps.

Scenario 3: Multiple Owners with Unequal Profit Splits

S Corps require one class of stock under IRC Section 1361(b)(1)(D). That means profit and loss must be allocated proportionally to ownership percentage. If you and your partner want a 70/30 profit split on a 50/50 ownership structure, an S Corp cannot accommodate that. A multi-member LLC taxed as a partnership offers the flexibility to allocate income, losses, and distributions however you want under IRC Section 704(b).

KDA Case Study: Graphic Designer Saves $16,200 After One Election Change

Rachel, a freelance graphic designer in Elk Grove, had been running her single-member LLC for four years. Her annual profit averaged $175,000. She came to KDA after realizing her tax bill felt “too high” compared to friends with similar incomes working as W-2 employees. Her Schedule C showed $175,000 in net profit. She was paying roughly $22,100 in self-employment tax alone, plus federal income tax of approximately $29,400 and California state tax of about $14,800. Her total tax burden exceeded $66,000.

KDA ran a five-layer comparison and identified $16,200 in annual savings by electing S Corp status on her existing LLC. Here is what we did:

• Filed Form 2553 using late election relief under Rev. Proc. 2013-30 (she had missed the March 15 deadline by six weeks)
• Filed FTB Form 3560 with the California Franchise Tax Board
• Set her reasonable salary at $85,000 based on BLS data for graphic designers in the Sacramento metro area and Revenue Ruling 59-221 nine-factor test documentation
• Activated AB 150 PTE election to bypass the $40,000 SALT cap on her $90,000 in pass-through distributions
• Established a Solo 401(k) with a $23,500 employee deferral plus $21,250 employer contribution, sheltering $44,750 from current taxation
• Set up dual depreciation schedules for her $12,000 in equipment (100% bonus depreciation federally, five-year MACRS for California)

Total first-year savings: $16,200. KDA engagement cost: $4,800. That is a 3.4x return on investment in year one. Over five years, projected cumulative savings: $81,000.

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 8-Step S Corp Election Process for Existing LLC Owners

If your LLC profit exceeds $60,000 and you have been paying full self-employment tax, here is the exact process to switch:

1. Verify IRC Section 1361(b) Eligibility – Confirm your LLC has no more than 100 members, all members are U.S. citizens or residents, and you have no nonresident alien members. Single-member LLCs automatically qualify.
2. Run a Five-Layer Tax Projection – Calculate your self-employment tax savings, QBI deduction impact, AB 150 PTE benefit, California franchise tax differential, and depreciation nonconformity adjustments. If the net savings exceed your administrative costs by at least 2x, proceed.
3. File IRS Form 2553 – Submit by March 15 for current-year effectiveness. All members must sign. If past the deadline, include a reasonable cause statement under Rev. Proc. 2013-30.
4. File FTB Form 3560 – Notify California separately. This form has no specific deadline alignment with Form 2553, but file it concurrently to avoid processing gaps.
5. Establish Payroll – Set up a payroll system (Gusto, ADP, or similar), obtain a California EDD employer account number, register for SDI at 1.1%, and begin quarterly 941 deposits through EFTPS.
6. Document Your Reasonable Salary – Pull BLS occupational wage data, document comparable salaries in your metro area, and create a salary justification memo referencing Revenue Ruling 59-221 factors. Keep this file permanently.
7. Activate AB 150 PTE Election – File the election with your S Corp return (Form 1120-S) and make the required estimated PTE tax payments to the FTB by the quarterly deadlines.
8. Set Up Dual Depreciation Schedules – Track federal depreciation (including 100% bonus depreciation under IRC Section 168(k)) separately from California depreciation (conforming to Section 179 at $2,500,000 limit but not bonus depreciation under R&TC Sections 17250 and 24356).

What the IRS Is Watching After You Elect S Corp

The IRS Palantir SNAP AI system cross-references your Form 1120-S officer compensation box with your W-2, your quarterly 941 filings, and your K-1 distributions. Three patterns consistently trigger audit flags:

Flag 1: Salary-to-Distribution Ratio Below 30%

If your total S Corp income is $200,000 and your salary is $40,000 (20%), the algorithm flags your return for manual review. Keeping your salary between 40% and 60% of total income generally avoids this trigger.

Flag 2: Missing or Late 941 Filings

S Corp owners who set up payroll but miss quarterly 941 deposits face both penalties under IRC Section 6656 and increased audit risk. The IRS treats missing payroll filings as evidence that the S Corp election may be a tax avoidance scheme rather than a legitimate business structure.

Flag 3: Sudden Income Drops After Election

If your Schedule C reported $200,000 last year and your S Corp K-1 reports $120,000 this year with no documented business reason, the IRS will investigate. The income drop suggests either unreported revenue or an attempt to minimize the salary base.

Flag 4: Form 7203 Basis Tracking Gaps

Starting in 2021, the IRS requires Form 7203 (S Corporation Shareholder Stock and Debt Basis Limitations) to track your basis in the S Corp. If your distributions exceed your basis, the excess is taxable as capital gains. Failing to file Form 7203 or filing it with errors invites IRS scrutiny.

Pro Tip: Set your payroll on a semi-monthly schedule and automate 941 deposits through EFTPS. This eliminates the two most common compliance triggers and costs nothing extra beyond your payroll provider’s base fee.

OBBBA Permanent Changes That Make 2026 the Best Year to Elect S Corp

The One Big Beautiful Bill Act locked in several provisions that amplify the s corp versus llc tax gap permanently:

• Permanent QBI Deduction (IRC Section 199A) – No longer sunsets. Every year you stay as a default LLC, you lose the optimized QBI calculation that the salary-distribution split enables.
• Permanent 100% Bonus Depreciation (IRC Section 168(k)) – Write off qualifying equipment in full the year you buy it. S Corp structure makes the dual depreciation tracking cleaner for California returns.
• $2,500,000 Section 179 Limit – California conforms to Section 179, making it the preferred depreciation method for California purposes. S Corp owners can use Section 179 federally and for California, avoiding the nonconformity headache entirely for amounts under the limit.
• $40,000 SALT Cap (Permanent) – The AB 150 PTE election remains the only bypass for California S Corp owners. Default LLCs cannot access this bypass.
• $15,000,000 Estate Tax Exemption – S Corp shares receive a stepped-up basis at death, potentially eliminating capital gains for heirs. LLC membership interests receive the same treatment, but the S Corp structure often results in cleaner valuations for estate planning purposes.

Do I Need to Form a New Entity to Get S Corp Benefits?

No. If you already have a California LLC, you do not need to dissolve it and form a new corporation. You simply file Form 2553 with the IRS and Form 3560 with the FTB. Your LLC remains an LLC under state law for liability protection purposes. Only the tax treatment changes. Your EIN stays the same. Your bank accounts stay the same. Your contracts stay the same.

Can I Switch Back to LLC Tax Treatment Later?

Yes, but there is a catch. Under IRC Section 1362(g), if you revoke your S Corp election, you cannot re-elect S Corp status for five tax years without IRS consent. That five-year lockout means you need to be confident the S Corp election is right before you file. This is why running a proper five-layer projection matters more than following generic advice online.

What If My Income Fluctuates Year to Year?

If your income bounces between $40,000 and $150,000 from year to year, the S Corp election may not make sense during the lean years because payroll costs are fixed while the tax savings shrink. However, you can adjust your salary downward in lower-income years (as long as it remains “reasonable” for the hours worked). The key is documentation. If you work 20 hours per week during a slow year and your salary reflects that reduced workload, the IRS has less basis to challenge it.

Frequently Asked Questions About S Corp Versus LLC

What is the minimum income to make an S Corp election worthwhile?

Most tax professionals agree that $60,000 to $75,000 in annual net profit is the threshold where S Corp savings consistently exceed the administrative costs. Below $60,000, the payroll processing fees, additional tax preparation costs, and compliance burden often eat the savings.

Does electing S Corp status change my liability protection?

No. Your LLC retains its state-level liability protection regardless of the tax election. The S Corp election only changes how the IRS and FTB tax your income. Creditors, lawsuits, and business debts are still governed by California LLC law (Corporations Code Section 17701.04).

Can I have an S Corp with multiple members?

Yes. A multi-member LLC can elect S Corp status, but all members must be eligible shareholders under IRC Section 1361(b). That means U.S. citizens or residents only, no more than 100 shareholders, and one class of stock. If you need flexible profit allocations, the S Corp structure may not work.

What happens to my Solo 401(k) if I switch to S Corp?

Your Solo 401(k) continues, but the contribution calculation changes. As an S Corp owner-employee, your employer contributions are based on your W-2 salary, not your total profit. At a $95,000 salary, you can contribute $23,500 as an employee deferral (2026 limit) plus 25% of salary ($23,750) as an employer contribution, for a total of $47,250. The employer contribution is a deductible business expense for the S Corp.

Will the IRS audit me for electing S Corp?

The election itself does not trigger an audit. But the IRS actively monitors S Corp returns for unreasonable salaries, missing 941 filings, and salary-distribution ratio anomalies using its Palantir SNAP AI system. Proper documentation and consistent payroll compliance keep you out of the crosshairs.

Is there a California-specific S Corp tax I should know about?

Yes. California imposes a 1.5% franchise tax on S Corp net income with an $800 minimum under R&TC Section 23802. This is different from the graduated LLC fee structure. At higher income levels, the 1.5% S Corp tax can exceed the LLC fee, but the federal savings from the S Corp election typically outweigh this difference by a factor of 5x to 10x.

This information is current as of May 5, 2026. Tax laws change frequently. Verify updates with the IRS or FTB if reading this later.

The IRS does not hide these savings from you. They just do not advertise them, either.

Book Your S Corp Election Strategy Session

If your LLC profit has been above $60,000 for more than one year and you have never run a five-layer S Corp comparison, you are almost certainly overpaying. Stop guessing. Book a personalized consultation with KDA’s strategy team and walk away with a clear projection of your savings, a step-by-step election timeline, and a compliance plan that keeps the IRS off your back. Click here to book your consultation now.