Self-Employment Tax Calculator 2026
Last reviewed: July 29, 2026Estimate your 2026 self-employment tax: Social Security (12.4%), Medicare (2.9%), Additional Medicare Tax where applicable, and the deductible half you can claim on Schedule 1. Based on confirmed 2026 IRS rules — Social Security wage base $184,500.
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How self-employment tax is calculated
Based on 2026 IRS rules — Schedule SE, Form 8959, IRC §1401–1402
When you work as a freelancer, independent contractor, or sole proprietor, you are responsible for the full cost of Social Security and Medicare taxes. Employees pay only half of these taxes; their employer covers the other half. As a self-employed person, you pay both halves — combined into what the IRS calls the self-employment (SE) tax.
SE tax applies when your net earnings from self-employment reach $400 or more in a tax year. This threshold is evaluated after the 92.35% adjustment described below.
Step 1 — Net earnings adjustment (×92.35%)
The IRS does not apply SE tax directly to your gross self-employment profit. You first multiply your net profit by 0.9235 to arrive at net earnings from self-employment. This adjustment exists because employers pay half of FICA taxes on behalf of their employees, and that employer share is not counted as employee income. The 92.35% multiplier gives self-employed taxpayers an equivalent offset before the full 15.3% rate is applied.
Example: $100,000 net profit × 0.9235 = $92,350 in net earnings subject to SE tax.
Step 2 — The 15.3% SE tax rate
The SE tax rate of 15.3% is composed of two components: 12.4% for Social Security (Old-Age, Survivors, and Disability Insurance — OASDI) and 2.9% for Medicare (Hospital Insurance — HI). Both apply to net earnings, but the Social Security portion has an annual cap.
Step 3 — Social Security wage base cap
The 12.4% Social Security tax applies only up to an annual earnings ceiling called the wage base. For 2026, the Social Security wage base is $184,500, confirmed by the Social Security Administration and IRS Publication 926. Net earnings above this amount are exempt from the 12.4% rate.
There is no cap for the Medicare portion — 2.9% applies to all net earnings from self-employment regardless of income level.
Example: Net earnings of $200,000 — Social Security tax applies to $184,500; the remaining $15,500 is subject only to the 2.9% Medicare rate.
Step 4 — Additional Medicare Tax (0.9%)
Higher earners owe a further 0.9% Additional Medicare Tax under IRC §3101(b)(2). This applies to net earnings from self-employment that exceed the thresholds below.
The threshold is compared against net earnings (after the 92.35% adjustment), not gross income. If your gross self-employment income is $210,000, your net earnings are $193,935 — below the $200,000 single threshold. No Additional Medicare Tax applies at that point. The AMT is reported separately on IRS Form 8959.
Step 5 — Deductible half of SE tax
Self-employed taxpayers may deduct half of the base SE tax (Social Security + Medicare, excluding Additional Medicare Tax) from gross income on Schedule 1, Form 1040, Line 15. This reduces adjusted gross income (AGI), which may lower federal income tax. The deduction does not reduce SE tax itself — only the income subject to income tax.
Example: Base SE tax of $14,000 → deductible amount of $7,000.
Where to report
SE tax is calculated on Schedule SE (Form 1040). Additional Medicare Tax, if applicable, is reported on Form 8959. To avoid underpayment penalties, most self-employed individuals must make quarterly estimated payments using Form 1040-ES, due on April 15, June 16, September 15, and January 15 of the following year.
Authoritative sources: IRS Schedule SE Instructions and IRS Publication 926.
Frequently asked questions
What is the self-employment tax rate for 2026?
The self-employment tax rate for 2026 is 15.3%, composed of 12.4% for Social Security (OASDI) and 2.9% for Medicare (HI). The Social Security portion applies only up to the $184,500 wage base. Taxpayers whose net self-employment earnings exceed $200,000 (single) or $250,000 (married filing jointly) owe an additional 0.9% Additional Medicare Tax on the amount above that threshold.
Do I still owe SE tax if I also have a W-2 job?
Yes, but your W-2 wages count toward the Social Security wage base first. If your wages alone reach $184,500, none of your self-employment earnings are subject to the 12.4% Social Security tax. If wages are below that cap, SE income fills the remaining room. The 2.9% Medicare tax applies to all earnings without a cap, and the Additional Medicare Tax threshold applies to the combined total of wages and net SE earnings.
What is the 92.35% net earnings adjustment?
Before calculating SE tax, you multiply your net profit by 0.9235 (92.35%). This adjustment mirrors how employees are taxed: an employer pays half of FICA taxes on behalf of the employee, and that employer share is not treated as the employee's income. The 92.35% multiplier gives self-employed taxpayers an equivalent offset before the full 15.3% SE tax rate is applied.
What is the Social Security wage base for 2026?
The Social Security wage base for 2026 is $184,500, as confirmed by the Social Security Administration and IRS Publication 926. Only earnings up to this amount are subject to the 12.4% Social Security (OASDI) tax. There is no cap for the 2.9% Medicare portion — it applies to all net self-employment earnings.
When do I need to pay quarterly estimated taxes?
If you expect to owe $1,000 or more in federal taxes for the year, you are generally required to make quarterly estimated tax payments using Form 1040-ES. For 2026, the due dates are April 15, June 16, September 15, and January 15, 2027. Self-employment tax counts toward the $1,000 threshold. Underpayment may result in an IRS penalty under IRC §6654.
Is self-employment tax the same as income tax?
No. Self-employment tax covers Social Security and Medicare — the equivalent of FICA taxes borne by employees and their employers. It is calculated on Schedule SE at a flat rate, separate from federal income tax, which is applied at graduated rates to taxable income after deductions. Both taxes apply to self-employment earnings, but through different mechanisms. You can deduct half of your SE tax from gross income before calculating federal income tax.