Self-employment tax on prop firm payouts

Updated November 6, 2026 · For the 2026 tax year

Self-employment tax is Social Security and Medicare tax on your own business profit. Prop firm payouts usually carry it on top of income tax, from the first dollar of profit. On a $1,000 payout it comes to about $141.

What self-employment tax is

An employee splits Social Security and Medicare tax with the employer, and the employer withholds the employee's half from each paycheck. A self-employed person pays both halves, through self-employment (SE) tax. For 2026 the rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.

You owe it if your net earnings from self-employment are $400 or more for the year. Age doesn't matter, and it applies even if you already get Social Security or Medicare benefits.

Why payouts usually carry it

Most prop firms pay funded traders as independent contractors. They withhold nothing and report the payouts as nonemployee compensation on a Form 1099-NEC. The IRS generally treats an independent contractor as self-employed. Your payouts minus your trading costs become business profit on Schedule C, and that profit is what SE tax is figured on.

Some traders ask whether payouts are futures gains taxed under the 60/40 rule. In a funded account you usually trade the firm's money and get paid a share of the profits, so the payout is pay for a service rather than your own trading gain. If your arrangement looks different, ask a CPA.

How Schedule SE figures it

You figure the tax on Schedule SE, which goes with your Form 1040. The short version for 2026:

Start with your net profit from Schedule C (payouts minus trading costs).
Multiply by 92.35% to get net earnings from self-employment. That trims off the equivalent of the employer's half.
Multiply by 12.4% for Social Security, on earnings up to the room left under the $184,500 wage base.
Multiply all of it by 2.9% for Medicare. There's no cap on this part.

A $1,000 payout with no costs works out like this:

Net earnings: $1,000 × 92.35%	$923.50
Social Security: $923.50 × 12.4%	$114.51
Medicare: $923.50 × 2.9%	$26.78
SE tax	$141.30

That's about 14.1% of the payout, with income tax still to add.

A day job uses up the wage base first

For 2026, Social Security tax applies to the first $184,500 of your combined wages and self-employment earnings. Your W-2 wages count first. On a $70,000 salary you have $114,500 of room left, so a payout pays the full 12.4%. If your salary is already over $184,500, payouts only pay the 2.9% Medicare part.

At higher incomes, an Additional Medicare Tax of 0.9% applies to wages and self-employment income above $200,000 for a single filer ($250,000 married filing jointly). Most traders with a regular day job won't reach it.

The deduction for half

You can deduct the employer-equivalent half of your SE tax when you figure your adjusted gross income. On the $1,000 example that's $70.65. It lowers your income tax, not the SE tax itself. If your payouts are taxed in the 22% bracket, it saves about $15.54 (22% of $70.65).

What it means for your set-aside

Add it up for a single filer with a $70,000 day job in a state with no income tax. On each $1,000 of payouts, that's about $141 of SE tax plus about $204 of federal income tax, roughly $346 in total. The set-aside table by state shows the same scenario with state tax for every state.

No one withholds any of it, so you pay it during the year through quarterly estimated tax or extra W-4 withholding at your day job. The free calculator works out your own number. It's an estimate, not tax advice, so confirm with a CPA.

Sources

IRS, Self-employment tax (Social Security and Medicare taxes): 15.3% rate, the $400 rule, the 2026 $184,500 base, the deduction for the employer-equivalent half, Additional Medicare Tax
IRS, 2026 Form 1040-ES: the 2026 self-employment tax worksheet (92.35%, 12.4%, 2.9%, wages counted first, the deduction for half)
IRS, About Schedule SE: what the form figures and who it applies to
IRS, Independent contractor (self-employed) or employee?
SSA, Contribution and benefit base: the 2026 wage base
IRS, Instructions for Form 8959: Additional Medicare Tax thresholds
Every figure above is also in PayoutTax's 2026 tax tables, with its source

General information, not tax advice. This guide explains common rules for US funded traders; your situation may differ. It isn't a substitute for a licensed CPA or IRS enrolled agent, so review your own numbers with one before you file or pay.