Self-employment tax deduction

Half of the Schedule SE tax on $80,000 is $5,651.82. That amount reduces income tax. The $11,303.64 of self-employment tax is still due.

Deductible half

$5,651.82

The deductible half is $5,651.82.

Half of SE tax is deductible. It does not cut the SE tax itself.

Breakdown

Breakdown
Schedule SE tax	$11,303.64
Deductible half	$5,651.82

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Deduction = 50% of Schedule SE tax. Income tax is computed after subtracting it. SE tax is not.

What the half does and does not do

You pay the full self-employment tax. Then you deduct half of it on Schedule 1, the same way the homepage engine deducts it before income tax and before the QBI base. It is not a credit and it is not half of your income tax.

The deduction cannot be larger than the SE tax, and it does not apply when net earnings are under $400 and SE tax is zero. Additional Medicare Tax is not part of this half.

Worked examples

$80,000 profit
Schedule SE tax	$11,303.64
Deductible half	$5,651.82

Common questions

Do I get half of my tax back?

No. You deduct half of the self-employment tax from income. The tax savings are that deduction times your income-tax bracket, not half of the SE tax. The SE tax itself stays on the return.

Does the deduction reduce QBI?

The qualified business income base on this site is profit minus the deductible half. A larger SE tax means a larger half and a slightly smaller QBI deduction. Both effects are in the homepage total.

Is Additional Medicare Tax in the half?

No. The half is half of the Schedule SE tax, which is Social Security plus the 2.9% Medicare tax. The 0.9% Additional Medicare Tax is figured separately and is not halved here.