LLC vs S-Corp Tax Comparison: 2026 Guide

The choice between operating as an LLC taxed as a sole proprietorship versus electing S-Corp status is one of the most consequential tax decisions for self-employed individuals in the United States. The difference can amount to thousands of dollars per year — but the right answer depends on your specific income level, filing status, state of residence, and willingness to handle added compliance.

The Core Tax Difference

An LLC taxed as a sole proprietorship (the default for single-member LLCs) pays self-employment tax on every dollar of net business profit. The SE tax rate in 2026 is 15.3%: 12.4% for Social Security (applied to the first $184,500 of net SE income) plus 2.9% for Medicare (applied to all net SE income, uncapped). An additional 0.9% Additional Medicare Tax applies to net SE income above $200,000 for single filers.

An S-Corporation changes this calculation fundamentally. S-Corp owners pay FICA — the same 15.3% but only on their W-2 reasonable salary. Any profit taken as a distribution (rather than salary) is completely excluded from SE tax. This creates a tax arbitrage opportunity: pay yourself a market-rate salary, take the remainder as distributions, and split the tax burden.

The Real Break-Even Point: $75K–$80K, Not $40K

You've probably heard that S-Corp status makes sense above $40,000 in profit. That figure circulates widely but it doesn't account for compliance costs — and it's dangerously misleading in 2026.

Here's the correct break-even analysis. At $40,000 net profit with a 50% salary split ($20K / $20K), gross SE tax savings are approximately $2,475 per year. S-Corp compliance (payroll service, Form 1120-S preparation, potential state returns) costs $2,000–$5,000 annually. Net result: a loss of $525 to $2,525 per year at the $40K level. The math simply doesn't work.

Above $75,000–$80,000 in net profit, the gross SE tax savings consistently exceed compliance costs. At $80K with a 50% salary: gross savings ~$6,120, compliance ~$3,000, net savings ~$3,120. At $100K: gross savings ~$7,650, net savings ~$4,650. At $150K: gross savings ~$11,475, net savings ~$8,475. Use the LLC vs S-Corp Calculator to model your specific numbers with your actual compliance costs.

How QBI Deduction Affects the Choice

The Qualified Business Income (QBI) deduction under Section 199A adds a layer of complexity that many calculators ignore. Under the One Big Beautiful Bill Act (OBBBA), QBI is permanently set at 23% of qualified business income.

The key difference between LLC and S-Corp QBI calculations: for an LLC (sole proprietorship), the QBI base includes your full net profit minus 50% of SE tax paid. For an S-Corp, your W-2 salary is explicitly excluded from QBI under §199A — only K-1 distributions count toward QBI. At $150K profit with a $75K salary: LLC QBI ≈ $33,450 (23% × $145,450 after SE tax adjustment); S-Corp QBI ≈ $17,250 (23% × $75,000). The S-Corp loses roughly $16,200 in QBI base compared to the LLC.

The QBI "loss" for S-Corps doesn't make S-Corp a bad choice — the SE/FICA savings almost always exceed the QBI difference at income levels above $75K. But you should include this in your calculation. Our Entity Comparison Calculator factors in QBI for all three entity types simultaneously.

Reasonable Salary: The Most Audited Area of S-Corp Compliance

The IRS requires S-Corp owner-employees to pay themselves a "reasonable salary" before taking distributions. This is not optional, and the IRS actively audits low-salary S-Corps using AI-driven data matching. In the Watson v. Commissioner case (668 F.3d 1008, 8th Cir. 2012), the court upheld IRS disallowance of a $24,000 salary when distributions totaled $203,000 — the court found the salary was unreasonably low.

What constitutes "reasonable" is facts-and-circumstances based, evaluated using nine IRS factors: duties and responsibilities, time devoted to the business, formal education and training, compensation history, peer company comparisons, the nature of the role, and the character's compensation for similar roles in the market. The IRS also uses SSA wage data and BLS industry compensation surveys.

A common heuristic is 40–60% of net business income, but this is not a safe harbor. In 2026, with the IRS focusing heavily on S-Corp reasonable compensation, document your salary annually using market data. Keep the documentation with your corporate minutes.

Compliance Costs: LLC vs S-Corp

Before electing S-Corp, understand the annual compliance burden. LLC costs are minimal: single-member LLCs file no separate federal tax return (Schedule C attaches to Form 1040). State filing fees range from $0 to $800/year (California's minimum franchise tax is the highest). Total annual LLC cost: $0–$1,200.

S-Corp costs are significantly higher. You must: run payroll at least quarterly (even if just for yourself), withhold and remit federal income tax and FICA, file Form 941 quarterly, file Form 940 for unemployment tax annually, file Form 1120-S annually, issue W-2 to yourself by January 31, and potentially file state payroll tax returns. A reputable payroll service costs $600–$1,800/year. Form 1120-S preparation by a CPA runs $500–$1,500/year. Total S-Corp compliance: $2,000–$5,000/year.

State Tax Considerations

Several states materially change the LLC vs S-Corp math. California adds a 1.5% state income tax on S-Corp net income plus an $800 franchise tax minimum, while LLCs pay an $800 minimum plus a gross receipts fee. New York exempts S-Corp distributions from the 4% Unincorporated Business Tax, making S-Corp clearly preferable for NY-based service businesses with $95K+ net income.

36 states have enacted Pass-Through Entity Tax (PTET) elections in 2026, allowing pass-through owners to pay state taxes at the entity level rather than on their personal return. PTET bypasses the $10,000 SALT deduction cap (raised to $40,000 under OBBBA for 2025–2029). For high-income owners in high-tax states, PTET makes both LLC and S-Corp more attractive — but the relative advantage between them doesn't shift dramatically.

How to Convert from LLC to S-Corp

The S-Corp election is made by filing IRS Form 2553. The filing deadline is March 15 of the tax year you want the election to take effect. If you file after that date, the election takes effect the following year.

The conversion process: (1) Convert your LLC to a corporation through your state's Secretary of State (file Articles of Incorporation or a conversion certificate); (2) Obtain a new EIN for the corporation; (3) File Form 2553 with the IRS Service Center; (4) Set up payroll with a payroll service; (5) Begin filing Form 1120-S in subsequent years.

Late election relief under Rev. Proc. 2013-30 is available if you've missed the deadline — attach a statement explaining the late filing and the reasons, and file as soon as possible. The IRS generally grants relief when reasonable cause is demonstrated.

Bottom Line: LLC vs S-Corp in 2026

Choose LLC if: your net profit is consistently below $60,000; you're in the early stages of a business with volatile income; you prefer simplicity; or your state has unfavorable S-Corp taxes.

Choose S-Corp if: your net profit consistently exceeds $75,000–$80,000/year; you can document a reasonable salary using market data; you're comfortable with quarterly payroll; and your state doesn't impose heavy S-Corp-specific taxes (California is an exception — run the numbers carefully).