Self-Employment Tax Guide for Freelancers

United States federal tax guidance. State and local rules may differ; consult a qualified tax professional for your situation.

Self-Employment Tax Guide for Freelancers

Self-employment tax is a Social Security and Medicare tax for individuals who work for themselves. If you're a freelancer, independent contractor, or solopreneur, you're responsible for paying both the employee and employer portions of these taxes. The combined rate is 15.3%, but it does not apply uniformly to all of your profit: the Social Security portion is capped at an annual wage base, while the Medicare portion is not.

The 15.3% Rate Breakdown

The self-employment tax rate consists of two components:

• Social Security Tax: 12.4% — applies only to net earnings up to the annual Social Security wage base of $184,500 for 2026. This cap is shared: if you also have W-2 wages, your wages and self-employment earnings count together toward the same $184,500 limit, so tax already withheld from wages can reduce (or eliminate) the Social Security portion of your self-employment tax.

• Medicare Tax: 2.9% — no earnings cap; applies to all of your net earnings subject to self-employment tax.

• Additional Medicare Tax: 0.9% — a separate surtax on combined earned income (Medicare wages plus self-employment earnings) over $200,000 for single filers and most other filing statuses, $250,000 for married filing jointly, or $125,000 for married filing separately. If you receive both Medicare wages and self-employment income, figure the 0.9% on any Medicare wages above your threshold first, then reduce that threshold by your total Medicare wages (not below zero) and apply the 0.9% to any self-employment income above the reduced threshold; a self-employment loss is not taken into account. Unlike the 2.9% Medicare portion, the 0.9% Additional Medicare Tax is not deductible.

Who Must Pay Self-Employment Tax

The general test is net earnings from self-employment of $400 or more. You must pay self-employment tax when all of the following apply:

• Your net earnings from self-employment are $400 or more (this is the controlling test)

• The earnings come from a trade or business carried on by a U.S. citizen or resident alien

• You have net profit from that business

Merely being a U.S. citizen or resident alien, or merely having some profit, is not by itself sufficient — the $400 net-earnings threshold is what generally triggers the requirement.

Calculating Your Self-Employment Tax

To calculate self-employment tax, start with your net earnings (gross income minus business expenses). Multiply this by 92.35% — the factor that generally determines your net earnings subject to self-employment tax — then apply the 15.3% rate. This 92.35% factor is separate from the deduction for half of your self-employment tax, which is subtracted from income when calculating your income tax.

Example: If you earned $50,000 in net self-employment income (below the 2026 Social Security wage base, so the full 15.3% applies):

$50,000 × 0.9235 = $46,175

$46,175 × 0.153 = $7,065 in self-employment tax

If your net earnings exceeded the $184,500 wage base, only the 2.9% Medicare portion would apply to the excess (plus 0.9% Additional Medicare Tax once combined earned income passes the threshold for your filing status).

Difference Between Self-Employment Tax and Income Tax

These are two separate taxes:

• Self-employment tax funds Social Security and Medicare

• Income tax funds general government operations

• You may owe both even if you have no income tax liability

Quarterly Estimated Tax Payments

Generally, you must make quarterly estimated tax payments if you expect to owe at least $1,000 in tax for the year after subtracting your withholding and refundable credits, AND your withholding and refundable credits are less than the smaller of 90% of your current-year tax or 100% of your prior-year tax (110% if your prior-year AGI exceeded $150,000; $75,000 if married filing separately). Paying the right total by year-end is not enough — the IRS generally requires timely quarterly installments on April 15, June 15, September 15, and January 15. See our quarterly estimated tax payments guide (https://solotax.tax/guides/quarterly-estimated-tax-payments/) for the full rules.

Conclusion

Understanding self-employment tax is crucial for freelancers and solopreneurs. By knowing the rates, calculation methods, and payment deadlines, you can better plan your finances and avoid penalties.

Official Sources (United States):

- IRS Tax Topic 554, Self-Employment Tax: https://www.irs.gov/taxtopics/tc554

- IRS Tax Topic 560, Additional Medicare Tax: https://www.irs.gov/taxtopics/tc560

- IRS Tax Year 2026 Inflation Adjustments: https://www.irs.gov/newsroom/irs-releases-tax-inflation-adjustments-for-tax-year-2026-including-amendments-from-the-one-big-beautiful-bill

- IRS Federal Income Tax Rates and Brackets: https://www.irs.gov/filing/federal-income-tax-rates-and-brackets

- SSA Contribution and Benefit Base (2026: $184,500): https://www.ssa.gov/oact/cola/cbb.html

- IRS 2026 Standard Mileage Rate: https://www.irs.gov/newsroom/irs-sets-2026-business-standard-mileage-rate-at-725-cents-per-mile-up-25-cents

- IRS Retirement Plan Contribution Limits: https://www.irs.gov/retirement-plans/cola-increases-for-dollar-limitations-on-benefits-and-contributions