How to Calculate Self-Employment Tax in 2026

Self-employment tax is the Social Security and Medicare tax paid by people who work for themselves. If you freelance, consult, drive for gig platforms, run a sole proprietorship, or receive business income reported on Form 1099-NEC, you may owe it in addition to regular federal income tax.

For 2026, the combined self-employment tax rate is still 15.3% on the part of net earnings subject to both Social Security and Medicare. That includes 12.4% for Social Security and 2.9% for Medicare. The 2026 Social Security wage base is $184,500, according to IRS Publication 15-A. Medicare has no wage base limit.

Self-Employment Tax Formula for 2026

1. Start with gross business income.
2. Subtract ordinary and necessary business expenses to get net profit.
3. Multiply net profit by 92.35%. This is the amount generally subject to self-employment tax.
4. Apply 12.4% Social Security tax up to the 2026 wage base of $184,500.
5. Apply 2.9% Medicare tax to all SE tax base income.
6. Add the 0.9% Additional Medicare Tax if your income exceeds the applicable threshold.

The 92.35% adjustment exists because self-employed people are treated as paying the employer share of Social Security and Medicare tax. It does not remove the tax, but it keeps the calculation closer to how employment taxes work for W-2 employees.

What the Social Security Wage Base Changes

The Social Security portion stops after the wage base. In 2026, only the first $184,500 of Social Security wages is subject to the 12.4% self-employment Social Security tax. If your SE tax base is above that amount, the excess is still subject to Medicare tax, but not Social Security tax.

If you also have a W-2 job, your wages and self-employment income interact. W-2 Social Security wages count toward the same annual wage base, so a high W-2 salary can reduce or eliminate Social Security tax on your self-employment income. Medicare tax still applies.

Self-Employment Tax Is Not Income Tax

Self-employment tax is separate from federal income tax. A freelancer with $75,000 of net profit can owe SE tax, federal income tax, state tax, and possibly local tax. Use the SE tax estimate first, then run the remaining income through an income tax calculation.

Quarterly Estimated Payments

Self-employed people often need to pay estimated taxes during the year because there is no employer withholding tax from each paycheck. The IRS says taxpayers can use Form 1040-ES to figure estimated tax payments.

• The first payment is generally due April 15.
• The second payment is generally due June 15.
• The third payment is generally due September 15.
• The fourth payment is generally due January 15 of the following year.

Ways to Reduce the Taxable Base

The main way to reduce self-employment tax is to reduce net profit with legitimate business deductions. Common deductions include software, professional services, business mileage, supplies, payment processing fees, home office expenses, and health insurance premiums where allowed.

Retirement contributions such as SEP-IRA or Solo 401(k) contributions may reduce income tax, but they usually do not reduce self-employment tax. Entity changes, such as electing S corporation treatment, can change payroll tax exposure, but they add complexity and should be reviewed with a tax professional.