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Half-SE-Tax Deduction

Also called: deductible part of SE tax, 1/2 SE tax

A federal income tax deduction equal to half of your self-employment tax, reported on Schedule 1 — one of the few breaks 1099 workers get that W-2 workers don't.

When you pay self-employment tax, you're effectively paying both the employee and employer halves of FICA. To partially compensate, the IRS lets you deduct half of your SE tax from your federal taxable income on Schedule 1, line 15.

The deduction:

  • Does NOT reduce SE tax itself — you still owe the full 15.3% on Schedule SE
  • Does reduce federal income tax by lowering taxable income
  • Is an "above the line" deduction — meaning you take it whether you itemize or use the standard deduction
  • Has no income limits

Example: $40,000 net SE income → ~$5,652 SE tax → $2,826 deductible from federal taxable income. At a 22% federal bracket, that saves ~$622 in federal income tax.

This is why a self-employed person with $40,000 net SE income owes meaningfully less than someone with $40,000 in W-2 wages would owe — the half-SE-tax deduction softens the SE tax sting on the income tax side.