Self-Employment Tax Calculator (Tax Year 2026)
Estimate your 2026 self-employment tax (Social Security + Medicare) and the deductible half, using the $184,500 wage base.
How the self-employment tax calculator (tax year 2026) works
For 2026 it takes 92.35% of your net self-employment income, charges 12.4% Social Security up to the $184,500 wage base plus 2.9% Medicare on all of it, and shows the deductible half of the resulting tax.
Worked example: with net self-employment income of $90,000, the self-employment tax calculator (tax year 2026) shows 2026 self-employment tax of $12,717.
- Social Security portion (12.4%)
- $10,306
- Medicare portion (2.9%)
- $2,410
- Total SE tax
- $12,717
- Deductible half
- $6,358
| Net self-employment income | 2026 self-employment tax |
|---|---|
| $40,000 | $5,652 |
| $90,000 | $12,717 |
| $160,000 | $22,607 |
| $250,000 | $29,573 |
The formula
2026 SE tax = 12.4% × min(net × 0.9235, $184,500 − W-2 wages) + 2.9% × (net × 0.9235); deduction = half of the SE tax.
Results are estimates for educational purposes and are not financial advice. Confirm exact figures with your lender, plan administrator or advisor.
Questions about the self-employment tax calculator (tax year 2026)
What is the 2026 Social Security wage base?
It is $184,500. The 12.4% Social Security portion of self-employment tax applies only up to that amount; the 2.9% Medicare portion has no ceiling.
Why do the self-employed pay 15.3%?
Because they are both employer and employee, they pay both halves of Social Security and Medicare — though they deduct half of the total against income tax.
Can I deduct any self-employment tax?
Yes — you deduct one half of your SE tax as an above-the-line adjustment, which lowers your income tax (though not the SE tax itself).
I also have a W-2 job — does that lower my SE tax?
Yes. Your W-2 wages already use part of the $184,500 Social Security wage base, so less of your self-employment income is hit by the 12.4% Social Security tax. If your W-2 wages exceed the base, you owe only the 2.9% Medicare portion. Enter your W-2 wages to see it.
Is the Self-Employment Tax Calculator (Tax Year 2026) free to use?
Yes. Every calculator on FinCalculators is completely free, with no sign-up, login or paywall. You can run as many scenarios as you like.
- 2026 Social Security & FICA Payroll Tax Facts — COLA, wage base, FICA rates, maximum benefit by age and the earnings test, 2026 and 2025.
- 2026 Tax Deadlines & Due Dates — Filing date, quarterly estimated-tax dates, the extension, and IRA/HSA deadlines.