LLC vs S-Corp: Tax Comparison 2026 (Real Break-Even Math, Compliance Costs, and When the Election Is Not Worth It)

The Core Tax Difference: How an LLC and an S-Corp Are Each Taxed

Before running any numbers, one clarification that most coverage of this topic skips: an S-Corp is not a business entity. It is a federal tax classification. When you "elect S-Corp status" for your LLC, your LLC remains an LLC in the eyes of your state. Your operating agreement does not change. Your liability protection does not change. Your state registration does not change. Only your federal tax treatment changes.

How a default LLC is taxed

A single-member LLC is treated by the IRS as a "disregarded entity." All net profit flows directly to your personal Form 1040 via Schedule C. You pay income tax on that profit at your marginal rate, and you also pay self-employment tax on 92.35% of your net earnings (the 92.35% figure accounts for the employer-side deduction). The self-employment tax rate in 2026 is 15.3%: 12.4% for Social Security on earnings up to $176,100, and 2.9% for Medicare with no income cap. An additional 0.9% Medicare surtax applies to income above $200,000 (single) or $250,000 (married filing jointly).

A multi-member LLC is taxed as a partnership by default. Each member pays self-employment tax on their distributive share of profits. The same 15.3% rate applies.

How an S-Corp-elected LLC is taxed

With S-Corp election, you split your income into two categories. First, you pay yourself a W-2 salary, which is subject to FICA payroll taxes at the same 15.3% rate (split between employer and employee portions, which you both pay as the owner). Second, remaining profits pass through as distributions, which are not subject to self-employment tax or FICA. Both your salary and distributions are still subject to ordinary income tax at your marginal rate. The tax savings come exclusively from the distributions that bypass the 15.3% FICA rate.

The Actual Math: Self-Employment Tax at Four Income Levels

All four examples below assume a calendar-year single-member LLC, standard deduction, no other income, and a reasonable salary set at 40% of net profit, which is toward the conservative end of the IRS-acceptable range. The Social Security wage base for 2026 is $176,100.

Estimates only. Based on 2026 SE tax rate of 15.3%, $176,100 Social Security wage base, 40% salary assumption, and typical S-Corp compliance costs of $1,500 to $3,000/year. Does not include state taxes, QBI deduction impact, or health insurance deduction. Consult a CPA for your specific situation.

Full Annual Compliance Costs to Subtract from Your Gross Savings

Gross self-employment tax savings are not your actual savings. You must subtract the additional annual compliance costs that come with S-Corp status. These are not optional: every S-Corp must run payroll and file Form 1120-S. The costs vary by provider and state.

Break-Even Analysis: The Income Threshold That Actually Matters

The break-even point for S-Corp election is the net profit level at which your gross self-employment tax savings equal your additional annual compliance costs. Below the break-even, staying as an LLC costs less in total. Above it, the S-Corp election saves money every year going forward.

With compliance costs of $1,500 to $3,500/year and a reasonable salary set at 40% of net profit, the math works out as follows:

All figures assume 40% salary, 2026 rates, and typical compliance costs. State taxes not included. California businesses should add the 1.5% state franchise tax and $800 minimum to compliance costs before comparing.

The practical rule used by most CPAs: if your net profit has been consistently above $50,000 to $60,000 for at least one full year and you expect it to remain there, the S-Corp election is worth analyzing seriously. If your profit is variable or you are in your first year, wait until income is stable before adding compliance complexity.

Reasonable Salary Rules: The Most Audited Issue in S-Corp Tax

The IRS requires every S-Corp owner-employee to pay themselves a salary that reflects what a third party would earn performing the same role. This is not optional and is not a fixed percentage. The IRS uses it to prevent business owners from paying themselves $1 in salary to route everything through tax-free distributions.

According to IRS audit data, 73% of S-Corp audits in 2026 focus on reasonable compensation. An IRS reclassification of distributions as wages triggers back payroll taxes at 15.3%, accuracy penalties of 20% of the underpaid amount, and interest from the original due date. One documented case: an owner earning $210,000 in net profit who paid himself a $40,000 salary was audited in 2025 and had $120,000 of distributions reclassified as wages, resulting in $34,200 in back payroll taxes plus a $9,500 penalty.

How the IRS evaluates your salary

The IRS considers: the role you perform in the business and the hours required, your training, experience, and education level, comparable market salaries for similar positions in your industry and geography (benchmarked using Bureau of Labor Statistics Occupational Employment Statistics data), and the profitability of the business relative to the compensation claimed.

Industry salary benchmarks (2026 typical ranges)

Most CPAs recommend setting salary at 40 to 60 percent of net income as a starting point, then adjusting upward if industry benchmarks require it. Document your salary determination in writing: a salary memo or a corporate resolution with market data attached. If you are audited, this documentation is the difference between a clean audit and a six-figure reclassification.

State-Specific Tax Impact: Where the S-Corp Election Hurts

The federal self-employment tax savings are real. But several states impose their own additional taxes on S-Corps that partially or fully offset the federal savings. Always calculate your combined federal and state net saving before electing.

California specifically: A California S-Corp pays 1.5% of net income as a franchise tax at the entity level (minimum $800/year), in addition to each shareholder paying California personal income tax on their K-1 income. For a business with $150,000 in net income, this adds $2,250 in California franchise tax on top of federal compliance costs. The election can still be worthwhile in California at higher income levels, but the threshold is higher than in no-income-tax states. California also requires a separate state S-Corp election via Form 3560 in addition to the federal Form 2553.

One Big Beautiful Bill Act: 2026 Changes That Affect This Decision

The One Big Beautiful Bill Act (signed July 4, 2025) made several changes that affect the LLC vs S-Corp calculation for 2026 and beyond:

• 100% bonus depreciation is now permanent. Equipment, vehicles, and qualified furniture purchases can be immediately deducted 100% in the year of purchase (previously phasing down). This reduces net income in purchase years for both LLC and S-Corp structures, but S-Corp owners who time large equipment purchases can substantially reduce their taxable distribution income.
• Domestic R&D expenses are immediately deductible. Previously required 5-year amortization beginning in 2022. Businesses investing in software development or domestic research benefit significantly in the year of expenditure.
• Section 179 expensing limit increased to $1.22 million for 2026 (phase-out begins at $3.05 million in total purchases, indexed annually). This benefits capital-intensive S-Corp owners who can accelerate deductions before year-end.
• QBI deduction phase-out thresholds updated. For specified service trades or businesses (SSTBs, including law, health, consulting, and financial services), the deduction phases out for single filers above $197,300 and married filing jointly above $394,600 in 2026. S-Corp salary is not QBI-eligible; only distributions qualify. Setting salary strategically affects QBI deduction size for high earners approaching these thresholds.

When the S-Corp Election Is the Wrong Move

Not every LLC should elect S-Corp status. Here are the specific situations where staying with default LLC taxation is the better decision:

• Net profit is consistently below $50,000. The compliance cost increase typically exceeds your self-employment tax savings at this income level. The election adds administrative burden for no net financial benefit.
• Your income is variable or you are in your first year. S-Corp compliance costs are fixed whether you are profitable or not. A year with low profits still requires you to run payroll and file Form 1120-S. Wait until income is stable before electing.
• You have foreign owners. S-Corp eligibility requires all shareholders to be U.S. citizens or resident aliens. Non-resident alien shareholders disqualify the election entirely.
• You want more than 100 shareholders. The S-Corp structure caps shareholder count at 100. If you plan to raise capital from multiple investors, an S-Corp election may limit your options. C-Corp or standard LLC structures are more appropriate.
• You need more than one class of stock. S-Corps can only have one class of stock. If your business structure requires preferred shares or different economic rights for different owners, S-Corp status is incompatible.
• You are in California with profits under $80,000. The 1.5% franchise tax on net income plus the $800 minimum, combined with federal compliance costs, can make the break-even point $80,000 or higher for California businesses. Run the specific numbers with a California CPA before electing.
• You cannot reliably pay yourself a market-rate salary. If your income is irregular, you travel frequently, or your business cannot support consistent payroll runs, the compliance burden of S-Corp payroll may be impractical. Missing payroll deposits triggers penalties starting at 2% and escalating to 15% of the unpaid amount.

How to Elect S-Corp Status for Your LLC (Form 2553)

An S-Corp election is made by filing IRS Form 2553 (Election by a Small Business Corporation) with the IRS. The process does not change your state-level LLC registration. Your LLC stays an LLC. Only your federal tax classification changes.

2026 deadlines

The Form 2553 deadline for the 2026 tax year was March 16, 2026 (March 15 fell on a Sunday; the deadline shifted to the next business day). If you missed this deadline, your election will apply to the 2027 tax year unless you qualify for late election relief under Revenue Procedure 2013-30.

New businesses have more flexibility: if your LLC was formed in 2026, you have 75 days from the date of formation to file Form 2553 for the election to apply in the current tax year. For example, an LLC formed on April 1, 2026 has until June 15, 2026 to elect S-Corp status for 2026.

Late election relief

The IRS may grant late election relief under Rev. Proc. 2013-30 if: fewer than 3 years and 75 days have passed since the intended effective date, all shareholders have filed their tax returns consistently as if the S-Corp election were in effect, and you can demonstrate reasonable cause for the late filing. Submit Form 2553 with the notation "FILED PURSUANT TO REV. PROC. 2013-30" at the top and include an explanation of reasonable cause.

Eligibility requirements

• Must be a domestic LLC or corporation (no foreign entities)
• Maximum 100 shareholders, all of whom must be U.S. citizens or resident aliens, or eligible trusts and estates
• Only one class of stock (or LLC membership interests with equivalent economic rights)
• Cannot be an ineligible corporation (certain financial institutions, insurance companies, or international sales corporations)
• All shareholders must sign and consent to the election on Form 2553

What happens after you file

The IRS typically processes Form 2553 within 60 days and sends a CP261 acceptance letter. If you have not received confirmation within 60 days, call the IRS Business and Specialty Tax Line at (800) 829-4933. Once approved, you must immediately set up payroll, begin paying yourself a documented reasonable salary, and engage a CPA for Form 1120-S preparation. The election takes effect from the date specified on Form 2553, not from the date you receive the acceptance letter.

Starting from Scratch: You Need the LLC Before You Can Elect

An S-Corp election requires an existing legal entity. If you have not yet formed your LLC, that is step one. The LLC is your legal structure; the S-Corp election is the tax classification layered on top. You cannot have one without the other.

For founders planning ahead, the optimal sequence is: form the LLC now (see our step-by-step guide), get the EIN (free at IRS.gov), consult a CPA to confirm S-Corp makes sense for your projected income, then file Form 2553 before the 75-day window from formation closes if you want the election to apply in your first tax year.

If your LLC is already formed and you are evaluating S-Corp election as a next step, the most important action is to consult a CPA (and watch out for LLC formation scams) with S-Corp experience in your state before filing Form 2553. The election is irrevocable without IRS consent for 5 years after it takes effect. Getting the salary determination right from day one avoids the most common and most costly compliance mistake in S-Corp taxation.

Frequently Asked Questions

What is the tax difference between an LLC and an S-Corp?

A default single-member LLC pays 15.3% self-employment tax on all net profit (12.4% Social Security on income up to $176,100 in 2026, plus 2.9% Medicare with no cap). With an S-Corp election, you split income between a W-2 salary (subject to payroll taxes at the same 15.3% rate) and distributions (which are not subject to self-employment tax). The income tax rate on distributions is the same as on salary. The entire tax savings comes from avoiding self-employment tax on the distribution portion of your income.

At what income level does an S-Corp election make financial sense?

The break-even for most businesses is $50,000 to $60,000 in annual net profit, after which the self-employment tax savings exceed the additional annual compliance costs of $1,500 to $3,500. California businesses should use a higher threshold of approximately $75,000 to $80,000 due to the 1.5% state franchise tax on S-Corp net income. At $100,000 net profit, the typical net annual saving is approximately $6,000 after compliance costs. At $250,000 net profit, net savings reach approximately $14,000 annually.

Does an S-Corp election change my legal structure?

No. An S-Corp is a federal tax classification under Subchapter S of the Internal Revenue Code. Filing Form 2553 changes how the IRS taxes your business. It does not change your state registration, your operating agreement, your liability protection, your registered agent, or any other aspect of your LLC's legal structure. Your LLC remains an LLC in every state that recognizes it.

What is a reasonable salary for an S-Corp owner?

The IRS requires a salary comparable to what a third party would earn performing the same role, based on your industry, geographic market, experience, hours worked, and the profitability of the business. Most CPAs recommend starting at 40 to 60 percent of net income, then adjusting based on BLS Occupational Employment Statistics benchmarks for your specific role. Document your salary determination with market data in writing. 73% of S-Corp audits in 2026 focus on reasonable compensation. The consequences of underpaying yourself are substantially more expensive than getting the salary right initially.

Can I revert back to LLC taxation after electing S-Corp?

Yes, but not immediately. An S-Corp election is generally irrevocable for 5 years after the effective date unless the IRS consents to termination. After 5 years, you can revoke the election by filing a written revocation with the IRS, signed by shareholders holding more than 50% of shares. A terminated S-Corp cannot re-elect for 5 years without IRS consent. This is one reason why running the break-even math carefully before electing is important: the election is a long-term commitment.

What is the Form 2553 deadline for 2027?

For calendar-year businesses wanting S-Corp status for the 2027 tax year, Form 2553 must be filed by March 15, 2027. New businesses formed in 2027 have 75 days from their formation date to file for the election to apply in their first tax year. Late election relief under Rev. Proc. 2013-30 allows retroactive elections within 3 years and 75 days of the intended effective date.

Do I need a lawyer to elect S-Corp status?

Not legally required. Form 2553 can be completed and filed by a business owner directly or with the assistance of a CPA. However, the decision of whether to elect and what salary to set requires tax expertise, not just form completion. The cost of a CPA consultation before electing (typically $300 to $600 for a one-time analysis) is substantially less than the cost of a salary reclassification if the election is structured incorrectly. The form itself is straightforward; the analysis behind it is not.