Self-Employment Tax Calculator: How Much Do You Owe? (2026)

Self-Employment Tax Explained

Self-employment (SE) tax covers Social Security and Medicare taxes for people who work for themselves. Unlike W-2 employees who split these taxes with their employer, self-employed individuals pay both portions.

2026 Self-Employment Tax Rates

How to Calculate Self-Employment Tax

Step-by-Step Calculation

Step 1: Calculate Net Self-Employment Income

Gross Business Income - Business Expenses = Net SE Income

Step 2: Calculate Taxable SE Income (92.35% adjustment)

Net SE Income × 0.9235 = Taxable SE Income

Step 3: Calculate SE Tax

Taxable SE Income × 0.153 = Self-Employment Tax (up to the $184,500 wage base; only 2.9% applies above it)

Step 4: Calculate Deductible Amount (for income tax)

SE Tax × 0.5 = Deduction from AGI

Calculation Example

Self-Employment Tax Table

*Includes 0.9% Additional Medicare Tax on net SE earnings above $200,000 (single filer threshold).

Combined Tax Burden (SE Tax + Income Tax)

Single filer, 2026 standard deduction ($16,100), 2026 tax brackets. Excludes the QBI deduction, which would lower federal income tax further for most eligible filers — see the QBI deduction guide.

Self-Employment vs. W-2 Comparison

Same Income Comparison

After 92.35% adjustment

Quarterly Estimated Tax Payments

Self-employed individuals must make quarterly estimated tax payments if they expect to owe $1,000+ in taxes.

Quarterly Due Dates

Estimated Payment Calculation

Safe Harbor Rules

Avoid underpayment penalties by paying:

• 100% of last year’s tax (110% if AGI > $150k), OR
• 90% of current year’s tax

Strategies to Reduce Self-Employment Tax

1. Maximize Business Deductions

Only deductions taken on Schedule C (before net profit is calculated) reduce your SE tax — because SE tax is based on Schedule C net profit.

2. Retirement Account Contributions

Important: SEP-IRA, Solo 401(k), and SIMPLE IRA contributions are claimed on Schedule 1 (above-the-line), not Schedule C. They reduce your income tax but do not reduce your self-employment tax, since SE tax is calculated on Schedule C net profit before these contributions are subtracted.

Example: $100,000 net SE income, $20,000 SEP-IRA contribution

• SE tax owed: $14,130 (unchanged — SEP contributions don’t affect the SE tax calculation)
• Federal income tax reduction from the $20,000 SEP contribution: roughly $4,400-$4,800, depending on marginal bracket
• Net effect: the SEP contribution lowers your income tax bill, not your SE tax bill — a common point of confusion

3. S-Corporation Election

For higher earners, S-corp status can reduce SE tax by limiting payroll tax to your salary instead of all net profit:

Note: S-corp has additional costs (payroll, tax filings) that may offset savings at lower income levels.

When S-Corp Makes Sense

Common SE Tax Forms

Key Takeaways

1. SE tax rate is 15.3% — Covers Social Security (12.4%, up to $184,500 in 2026) and Medicare (2.9%)

2. You pay both employee and employer portions — Unlike W-2 employees who split with employer

3. Deduct 50% of SE tax — Helps reduce your income tax

4. Make quarterly payments — Avoid underpayment penalties

5. Maximize Schedule C deductions — Every $1,000 in business expense deductions saves $153 in SE tax; retirement and health insurance deductions save on income tax only, not SE tax

6. Consider S-corp at higher incomes — Can save thousands in SE tax annually

Sources

• Internal Revenue Service. “Self-Employment Tax (Social Security and Medicare Taxes).” irs.gov
• Social Security Administration. “Contribution and Benefit Base.” ssa.gov

Self-employment tax is 15.3% of net earnings (up to the Social Security wage base) — but you can deduct 50% of SE tax from gross income as an above-the-line adjustment, reducing your income tax bill. For all the strategies to reduce SE tax liability — including the S-corp election and retirement account contributions — see the freelancer tax guide. To avoid an underpayment penalty for falling short during the year, quarterly estimated payments are required — see quarterly tax payment calculator to calculate your amounts.

Written by WealthVieu

WealthVieu researches and writes data-driven personal finance guides using primary sources including the IRS, Bureau of Labor Statistics, Federal Reserve, and Census Bureau.