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Self-Employment Tax Calculator

See Social Security and Medicare tax on net self-employment earnings for 2026, plus the deductible half and a quarterly estimate.

Tax year 2026. Profit after ordinary expenses, before this tax.

Optional. Wages already taxed for Social Security reduce the wage base that is left.

Estimated self-employment tax

$11,303.64

Tax year 2026. Social Security wage base $184,500.00. This is an estimate, not tax advice.

Net earnings
$80,000.00
Amount taxed (92.35%)
$73,880.00
Wage base left after W-2 wages
$184,500.00
Social Security wages
$73,880.00
Social Security tax (12.4%)
$9,161.12
Medicare tax (2.9%)
$2,142.52
Additional 0.9% Medicare
Not included
Deductible half
$5,651.82
Estimated quarterly payment
$2,825.91

The quarterly amount is one quarter of this Social Security and Medicare estimate. It does not include income tax.

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How it's calculated

Net self-employment earnings are multiplied by 92.35%. Social Security tax is 12.4% of that amount, up to the 2026 wage base of $184,500. W-2 wages reduce the base that is left. If those wages already fill the base, Social Security tax on the self-employment earnings is zero. Medicare tax is 2.9% of the full 92.35% amount. The additional 0.9% Medicare tax is not included. The deductible half is half of the Social Security and Medicare total. The quarterly estimate is that total divided by four. It is not a full income-tax payment. This is an estimate, not tax advice.

Taxable amount = net earnings × 92.35%
Social Security = 12.4% up to the wage base left
Medicare = 2.9% of the taxable amount

Reviewed by WH2L Digital. Last reviewed October 31, 2026. Wage base: IRS Topic 751, Social Security and Medicare withholding rates.

Questions

Why are earnings multiplied by 92.35%?

Self-employment tax is figured on net earnings times 92.35%. That reduced amount is what this estimate uses for both Social Security and Medicare.

What is the 2026 Social Security wage base?

The 2026 Social Security wage base is $184,500. Social Security tax is 12.4% up to that base. W-2 wages already taxed reduce the base that is left. Medicare is 2.9% of the 92.35% amount and is not capped here.

What does this estimate leave out?

It leaves out income tax and the additional 0.9% Medicare tax on higher earnings. The quarterly figure is one quarter of this Social Security and Medicare estimate, not a full estimated-tax payment. This is an estimate, not tax advice.

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Educational estimates only, not financial advice. This tax figure is an estimate, not tax advice.