S-Corp vs LLC Taxes: Which Business Structure Saves More?
Let's start with a concrete example: a freelance software consultant earning $180,000 net profit. As a default single-member LLC, she owes $24,679 in self-employment tax. After electing S-corp status and paying herself a $95,000 salary, her payroll tax burden drops to $14,535 — a savings of $10,144 per year. That's one vacation, one maxed 401(k), or a year of health insurance premiums. The question isn't whether an S-corp can save you money. It's whether it saves you enough to be worth the complexity.
Key Takeaways
- •Default LLC owners pay 15.3% self-employment tax on 92.35% of all net profit — there's no escaping it without an election
- •S-corp election (Form 2553) limits SE tax to the owner's "reasonable salary" — profits paid as distributions are exempt from payroll taxes
- •The 2026 breakeven point where S-corp savings exceed additional costs is generally $75,000–$85,000 in net annual profit
- •Underpaying yourself is the #1 S-corp audit trigger — the IRS uses industry wage databases and flags distributions that dwarf salary
- •Both structures qualify for the 20% QBI deduction made permanent by the One Big Beautiful Bill Act of 2025
The Core Tax Difference: Where Self-Employment Tax Hits
To understand why this comparison matters, you need to understand self-employment tax. Under the Federal Insurance Contributions Act (FICA), employees and employers each pay 7.65% on wages — 6.2% Social Security and 1.45% Medicare — for a combined 15.3%. When you work for yourself, you pay both sides: the full 15.3%.
For 2026, Social Security tax applies to the first $176,100 in wages or net self-employment income (per IRS Notice 2025-82). Medicare at 2.9% applies to all net earnings with no cap. An additional 0.9% Medicare surtax applies to earned income above $200,000 (single) or $250,000 (married filing jointly) under the Affordable Care Act, though this applies identically in both structures.
The critical distinction: as a default LLC (disregarded entity or partnership), all net profit is subject to SE tax. As an S-corp, only the owner's W-2 salary is subject to payroll taxes. Profits distributed beyond that salary are completely exempt. This gap is where the savings live.
Detailed Tax Calculation: LLC Default vs. S-Corp at Four Income Levels
The following calculations assume a single owner, no employees, and a reasonable salary set at approximately 55% of net profit (a common benchmark for service businesses). SE tax applies to 92.35% of net earnings for Schedule C filers to account for the employer-side deduction.
| Net Profit | LLC SE Tax | S-Corp Salary | S-Corp Payroll Tax | Gross Savings | After Costs (~$4K) |
|---|---|---|---|---|---|
| $50,000 | $7,065 | $27,500 | $4,208 | $2,857 | -$1,143 (not worth it) |
| $80,000 | $11,304 | $44,000 | $6,732 | $4,572 | +$572 (borderline) |
| $120,000 | $16,956 | $66,000 | $10,098 | $6,858 | +$2,858 |
| $200,000 | $25,737 | $95,000 | $14,535 | $11,202 | +$7,202 |
The data makes the breakeven point clear: around $75,000–$85,000 in net profit, the S-corp election starts generating meaningful net savings. Below that threshold, the additional compliance costs — payroll software, Form 1120-S preparation, quarterly Form 941 filings — consume most or all of the tax savings. According to a 2024 survey by the National Federation of Independent Business (NFIB), average additional accounting costs for small S-corps run $2,000–$3,500 per year beyond what a sole proprietor pays.
What Is a "Reasonable Salary" and Why It's Non-Negotiable
The S-corp tax strategy only works if you pay yourself a salary — and the IRS requires that salary to be "reasonable." IRC §3121(d)(1) and the related regulations define reasonable compensation as the amount that would be paid in an arm's-length transaction to an unrelated employee for the same services in the same industry and geography.
The IRS uses Bureau of Labor Statistics Occupational Employment and Wage Statistics (BLS OEWS) data, LinkedIn salary surveys, and industry compensation databases to benchmark S-corp owner salaries. In its training materials for revenue agents (the IRS Officer Compensation Job Aid, available on IRS.gov), the agency identifies specific industries and geographic markets where S-corp owner salaries are systematically underreported.
Common industry benchmarks for 2026:
| Industry | BLS Median Wage | Reasonable Salary Range | Common Mistake |
|---|---|---|---|
| Software Developer | $120,000–$155,000 | $90,000–$140,000 | Salary below $60K on $300K profit |
| Consultant (management) | $95,000–$130,000 | $75,000–$120,000 | Ignoring geographic adjustment |
| CPA / Accountant | $78,000–$110,000 | $65,000–$100,000 | Paying less than junior staff |
| Physical Therapist | $90,000–$105,000 | $80,000–$105,000 | Salary far below billing rate |
| Real Estate Agent | $50,000–$80,000 | $40,000–$75,000 | Paying minimal salary on high commissions |
| Dentist / Physician | $180,000–$280,000 | $160,000–$250,000 | S-corp savings are minimal at this income |
When the IRS reclassifies distributions as wages, the consequences are severe: back FICA taxes owed by both the employer and employee sides, plus the 100% Trust Fund Recovery Penalty under IRC §6672, plus a 20% accuracy-related penalty under §6662, plus interest. A $50,000 distribution reclassification can generate a $20,000+ assessment by the time penalties and interest are applied.
Use our Self-Employment Tax Calculator to model exactly what you owe under both structures before making the election.
The Mechanics of Making an S-Corp Election
Step 1: Confirm Eligibility
An S-corporation can have a maximum of 100 shareholders, all of whom must be U.S. citizens or resident aliens. Only one class of stock is permitted (though differences in voting rights are allowed). Partnerships, corporations, and most trusts cannot be shareholders. These restrictions mean S-corp status is primarily designed for owner-operated small businesses — not investment vehicles with multiple investor types.
Step 2: File Form 2553
An LLC elects S-corp status by filing IRS Form 2553 (Election by a Small Business Corporation). The timing is critical:
- To apply for the current tax year: File by March 15, 2026 (for calendar-year businesses)
- For a new LLC: File within 75 days of formation for same-year election
- For late elections: File Form 2553 with a statement of reasonable cause — the IRS has granted relief in most cases where businesses simply missed the deadline but otherwise qualified
If your LLC has multiple members, all must consent to the election on Form 2553. The IRS generally processes elections in 60 days and sends a CP261 Notice confirming the election.
Step 3: Set Up Payroll
Once the S-corp election takes effect, you must run actual payroll for yourself. This means:
- Withholding federal income tax, Social Security, and Medicare from each paycheck
- Depositing payroll taxes with the IRS — typically by the next business day after payroll if you accumulate more than $50,000 in payroll taxes annually
- Filing Form 941 (Employer's Quarterly Federal Tax Return) four times per year
- Filing Form W-2 by January 31 of the following year
Payroll software services like Gusto, QuickBooks Payroll, or ADP run $50–$150 per month for a single-employee S-corp. This is a real cost that belongs in your breakeven analysis.
Step 4: File Form 1120-S Annually
The S-corp files Form 1120-S (U.S. Income Tax Return for an S Corporation) by March 16, 2026. A 6-month extension is available via Form 7004. Each shareholder receives a Schedule K-1 reporting their share of the corporation's income, deductions, and credits. That K-1 income flows to the owner's Form 1040 but is not subject to SE tax.
LLC vs. S-Corp: Beyond the SE Tax Comparison
The QBI Deduction (Section 199A)
Both default LLCs and S-corps qualify for the Section 199A Qualified Business Income deduction — up to 20% of qualified business income. The deduction was made permanent in 2025 under the One Big Beautiful Bill Act. For 2026, the income thresholds are $201,775 (single) and $403,500 (married filing jointly).
There is one important nuance: S-corp wages paid to the owner-employee reduce QBI. If you earn $150,000 in S-corp profit and pay yourself $80,000 in salary, your QBI eligible for the 20% deduction is $70,000 (the distribution), not $150,000. This is a real interaction that can partially offset S-corp tax savings in higher-income situations. The Tax Policy Center estimates that the QBI deduction saves pass-through business owners an average of $12,200 annually — but the calculation interacts differently for LLCs versus S-corps.
Solo 401(k) Contributions
One frequently overlooked advantage of S-corp status involves retirement contributions. As a default LLC owner on Schedule C, your Solo 401(k) contribution limit is $70,000 in 2026 (employer + employee combined), but the employer contribution is limited to 25% of net self-employment income after the SE tax deduction. As an S-corp, the employer contribution is 25% of your W-2 wages — which can be a cleaner calculation and, depending on salary structure, can meaningfully increase or decrease your maximum contribution amount.
The 2026 catch-up contribution limit for those 50 and older is $7,500, or $11,250 for those between 60 and 63 (per SECURE 2.0). See our Retirement Account Tax Benefits guide for how these limits work in each business structure.
Health Insurance Deductions
Self-employed individuals — including LLC owners and S-corp shareholders who own more than 2% of the corporation — can deduct 100% of health insurance premiums as an above-the-line deduction. The mechanics differ slightly: LLC owners deduct on Schedule 1, line 17 of Form 1040, while S-corp owner-employees must have the premium reported on their W-2 in Box 1 as wages (and the deduction flows from there). The end result is similar, but the S-corp route requires the additional payroll step.
The Hidden Costs of S-Corp Status
Tax savings projections for S-corp elections frequently underestimate real compliance costs. Here's an honest accounting:
| Cost Item | Typical Annual Cost | Notes |
|---|---|---|
| Payroll software | $600–$1,800 | Gusto, QuickBooks, ADP |
| Form 1120-S preparation | $800–$2,500 | CPA adds complexity vs. Schedule C |
| State registration fees | $50–$800 | Varies by state |
| State unemployment insurance | $100–$400 | Owner-employees may be exempt in some states |
| Workers' comp insurance | $200–$500 | Required in most states even for owner-only |
| Total additional cost | $1,750–$6,000 | Use mid-range $3,500 for breakeven analysis |
Using a $3,500 cost estimate, the S-corp election doesn't generate positive net savings until gross SE tax savings exceed $3,500 — which at the 2026 FICA rates, requires roughly $75,000–$80,000 in net profit where distributions (non-salary income) are meaningful. Below that, you're paying for complexity without commensurate return.
When NOT to Elect S-Corp Status
S-corp election is not universally superior. These situations argue against it:
- Net profit below $75,000: Compliance costs typically exceed tax savings
- Highly variable income: Running payroll on a salary you may not be able to sustain creates cash flow problems and potential payroll tax defaults
- Planning to raise venture capital: VCs require C-corp structure; converting from S-corp creates additional tax complexity
- Multiple investors or foreign owners: S-corps have strict shareholder requirements that preclude most institutional investment
- Passive income over 25% of gross receipts: Excessive passive income can trigger the S-corp built-in gains tax and potentially terminate the election
- Certain states: California imposes an additional 1.5% S-corp franchise tax on net income (minimum $800), which reduces the net federal savings
Real-World Case Study: Marketing Agency at $160,000 Net Profit
Consider a sole-owner digital marketing agency in Austin, Texas. The owner generates $160,000 in net profit in 2026.
Default LLC (Schedule C):
SE tax base: $160,000 × 92.35% = $147,760
SE tax: $147,760 × 15.3% = $22,607
SE tax deduction: 50% of $22,607 = $11,304 above-the-line
QBI deduction: ($160,000 − $11,304) × 20% = $29,739
Taxable income (after deductions): $160,000 − $11,304 − $29,739 − $16,100 (standard) = $102,857
Estimated income tax (single, 2026 brackets): ~$18,400
Total federal tax: ~$41,007
S-Corp (Reasonable salary: $88,000):
Payroll taxes on $88,000: $13,464 (employer + employee combined, split)
S-corp distribution: $160,000 − $88,000 salary − $6,732 employer FICA = $65,268
K-1 income: $65,268 (not subject to SE tax)
QBI: $65,268 × 20% = $13,054
Taxable income: $88,000 + $65,268 − $13,054 − $16,100 = $124,114
Estimated income tax: ~$22,300
Additional compliance costs: $3,500
Total federal + compliance: ~$39,264
Annual net savings: ~$1,743
The net savings here are modest at $160,000 — which illustrates an important nuance. The QBI deduction partially offsets the benefit because the S-corp reduces deductible QBI. At this income level, the decision is close, and the business owner should weigh non-tax factors (simplicity, flexibility, state-specific costs) heavily. At $200,000+ in net profit, the math becomes decisively favorable for S-corp status.
Frequently Asked Questions
Can an LLC be taxed as an S-corp without converting to a corporation?
Yes. An LLC can elect S-corp tax treatment by filing Form 2553 without changing its state-law legal structure. The LLC remains an LLC for liability and governance purposes, but the IRS taxes it as an S-corp. This is called an "S-corp election" on an LLC, and it's the most common approach for small businesses because it combines LLC simplicity with S-corp tax efficiency.
What happens if I pay myself too little as an S-corp?
If the IRS determines your salary is unreasonably low, it can reclassify distributions as wages under IRC §3121(d)(1). This triggers back FICA taxes, the 100% Trust Fund Recovery Penalty on the employee-side tax, a 20% accuracy-related penalty under §6662, and interest. In significant cases, total assessments easily reach five figures. Document your salary decision with a written comparable wage analysis each year.
Do S-corp owners still qualify for the 20% QBI deduction?
Yes, but only on the S-corp distribution (K-1 income), not on the W-2 salary. The salary portion is W-2 wages and doesn't generate QBI. For a $200,000 S-corp earning $100,000 salary and $100,000 distribution, the QBI deduction applies to $100,000, not $200,000. This interaction reduces some of the S-corp's tax advantage relative to simple projections that ignore QBI.
When is the deadline to elect S-corp status for 2026?
To apply for the 2026 tax year, Form 2553 must be filed by March 15, 2026. For a new business formed in 2026, you have 75 days from formation to elect and have it apply from the start. Late elections are possible with reasonable cause — the IRS grants them frequently for businesses that otherwise qualify. Filing late doesn't mean automatic denial, but do attach a statement explaining the delay.
Does S-corp election affect state taxes?
Yes, significantly. California imposes an additional 1.5% S-corp franchise tax on net income (minimum $800). New York City does not recognize S-corp status for city tax purposes — NYC residents pay full city income tax on S-corp income. Some states don't recognize S-corp elections at all. Always model state-specific impacts; the federal savings can be partially or fully offset by state-level costs in certain jurisdictions.
At what income does an S-corp stop saving money on SE tax?
Once your salary reaches the Social Security wage base ($176,100 for 2026), the Social Security portion of SE tax is already capped. At very high incomes where a reasonable salary consumes most or all of net profit, S-corp savings diminish significantly — only the 2.9% Medicare component (not Social Security) applies to the excess. Above $200,000, the 0.9% additional Medicare surtax applies identically under both structures.
Calculate Your SE Tax Under Each Structure
Model your exact self-employment tax as a default LLC and see how much an S-corp election could save you at your income level.
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