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Self employment tax

Schedule SE payroll tax

Self Employment Tax Calculator for 2025 and 2026

Estimate Schedule SE Social Security and Medicare, Additional Medicare Tax on self employment income, and the deductible half.

2025 finalFocused federal estimate

Result details

Schedule SE net earnings
$92,350.00
Social Security tax
$11,451.40
Medicare tax
$2,678.15
Schedule 1 deductible half
$7,064.78

Tax components

ItemAmount
Social Security$11,451.40
Regular Medicare$2,678.15
Additional Medicare on entered net earnings$0.00
Total self employment tax$14,129.55

Important caveats

  • This is a Schedule SE estimate for one taxpayer and not a complete federal return. Each spouse generally completes a separate Schedule SE.
  • Form 4137 and Form 8919 Social Security amounts reduce the remaining wage base here. The separate taxes calculated on those forms are not added to this result.
  • Form 8959 line 2 and line 3 amounts only provide threshold context here. Wage side Additional Medicare Tax and actual withholding belong in the separate Additional Medicare calculator.
  • The deductible half is 50% of regular Schedule SE tax. It excludes Additional Medicare Tax.
  • Quarterly payment timing and penalties require a separate analysis.
2025 final2026 planning estimateReviewed

At a glance

Quick answer

The self employment calculator estimates one taxpayer's regular method Schedule SE Social Security and Medicare tax on combined net business profit or loss. It coordinates Schedule SE lines 8a through 8d with Form W-2 boxes 3 and 7, Form 4137 line 10, and Form 8919 line 10. It separately uses Form W-2 box 5, Form 4137 line 6, and Form 8919 line 6 as Form 8959 threshold context. It shows Additional Medicare Tax on the entered net earnings and the deductible half of regular Schedule SE tax. It is not an income tax calculator or a complete return.

How the calculation works

Combine profit and loss before the adjustment

Enter this taxpayer's combined regular method Schedule SE sources, including supported Schedule C, Schedule F, and Schedule K-1 amounts after the underlying business expenses. When the combined amount is positive, Schedule SE multiplies it by 92.35%. A zero or loss remains zero or negative for this step. If adjusted net earnings are below $400, no regular tax is modeled. The separate church employee exception begins at $108.28 of qualifying church employee income and is not supported here.

Complete Schedule SE lines 8a through 8d

The taxpayer's Form W-2 boxes 3 and 7 amount enters line 8a. Form 4137 line 10 enters Schedule SE line 8b, and Form 8919 line 10 enters Schedule SE line 8c. Add them on line 8d, subtract the total from the annual wage base, and apply 12.4% to the smaller of the remaining base or net earnings. A spouse's Social Security wages do not consume this taxpayer's base.

Keep Form 8959 Medicare amounts separate

Regular Medicare is 2.9% of Schedule SE line 6 without the Social Security ceiling. Form 8959 line 1 uses Form W-2 box 5, line 2 uses Form 4137 line 6, and line 3 uses Form 8919 line 6. On a joint return, the Form 8959 amounts include both spouses. Those Medicare amounts reduce the filing status threshold before 0.9% Additional Medicare Tax is applied to entered Schedule SE net earnings. RRTA compensation follows a separate Form 8959 part and is not combined here.

Interpret the deductible half correctly

Schedule SE line 13 is 50% of regular line 12 Social Security plus Medicare tax and carries to Schedule 1 line 15. The deductible half excludes Additional Medicare Tax. It is an adjustment used in the income tax calculation, not a credit and not a subtraction from the tax shown here.

2025 and 2026 values

Tax year 2025

2025 final Schedule SE values

The final 2025 calculation uses a 92.35% net-earnings factor, $400 filing threshold, 12.4% Social Security rate, 2.9% Medicare rate, and $176,100 Social Security wage base.

Tax year 2026

2026 planning Schedule SE values

The 2026 planning calculation keeps the 92.35%, $400, 12.4%, and 2.9% values while increasing the Social Security wage base to $184,500.

Recalculate it yourself

Worked example

$100,000 net profit with no W-2 wages

A single taxpayer enters $100,000 of net self-employment profit, $0 taxpayer W-2 wages, and $0 spouse Medicare wages for 2025.

  1. Net earnings = $100,000 × 92.35% = $92,350.
  2. Remaining Social Security base = $176,100 − $0 taxpayer W-2 wages = $176,100.
  3. Self-employment Social Security = min($92,350, $176,100) × 12.4% = $11,451.40.
  4. Self-employment Medicare = $92,350 × 2.9% = $2,678.15.
  5. Total self-employment tax = $11,451.40 + $2,678.15 = $14,129.55; deductible half = $14,129.55 ÷ 2 = $7,064.78 after rounding.

Result

Modeled self-employment tax is $14,129.55, with a $7,064.78 deductible-half amount for the separate income-tax calculation.

What is included

  • One taxpayer's combined regular method profit or loss, 92.35% positive net earnings adjustment, $400 threshold, Schedule SE lines 8a through 8d, 12.4% Social Security, 2.9% Medicare, Form 8959 wage context, Additional Medicare on entered net earnings, and the deductible half of regular Schedule SE tax.
  • Final 2025 and planning 2026 wage bases. Form 4137 and Form 8919 use separate Social Security line 10 and Medicare line 6 inputs so swapping the two statutory wage paths cannot silently change the result.

What is not included

  • Business expense calculation, federal income tax, QBI, retirement and health insurance deductions, actual estimated payments, penalties, state tax, and entity payroll.
  • Church employee income subject to the $108.28 exception, ministers, clergy, members of religious orders, Christian Science practitioners, farm and nonfarm optional methods, RRTA compensation, and the special rules in Publication 517.
  • Worker classification and entity classification. S corporation wages may be payroll wages, while S corporation distributions are not automatically self employment income. Partnership guaranteed payments and a partner's Schedule K-1 box 14 code A amount require correct classification before they are included.
  • Spouse Schedule SE income. Each spouse generally files a separate Schedule SE. Use the Additional Medicare calculator or return preparation to combine line 6 from multiple Schedules SE and to calculate wage side Form 8959 liability and withholding.

Common mistakes

Entering gross receipts as net profit

The starting amount should reflect deductible business expenses. Revenue entered before expenses exaggerates net earnings and both tax components.

Subtracting spouse wages from the taxpayer wage base

Only the taxpayer's own W-2 wages consume that taxpayer's Social Security base. Spouse wages matter only in supported joint Additional Medicare context.

Subtracting the deductible half from Schedule SE tax

The adjustment belongs in the income-tax calculation. It does not reduce the $14,129.55 self-employment tax in the example.

Treating every business payment as Schedule SE income

Guaranteed payments and partnership shares can enter Schedule SE, but classification depends on the Schedule K-1. S corporation wages and distributions follow different rules. Do not enter a distribution merely because it came from a business.

Frequently asked questions

What does the Self employment tax calculator estimate?

It estimates one taxpayer's regular method Schedule SE tax on combined business profit or loss. Form W-2 boxes 3 and 7 plus Forms 4137 and 8919 line 10 coordinate the Social Security wage base. Form W-2 box 5 plus Forms 4137 and 8919 line 6 supply Form 8959 context.

Why are net earnings adjusted before self employment tax?

Schedule SE generally applies the tax to an adjusted share of net self employment earnings rather than the full entered profit. The calculator follows its cited federal source.

Does this result include federal income tax on business profit?

No. This focused tool models self employment tax. Federal income tax, business deductions, credits, and estimated payment timing require separate calculations.

Does the deductible half include Additional Medicare Tax?

No. Schedule SE line 13 is 50% of regular Schedule SE line 12 tax. Additional Medicare Tax from Form 8959 is not included in that deduction.

Primary sources