Prop Firm Trader Tax Basics (US): What to Set Aside, What to Track
Prop firm payouts are 1099 income, not investment income. Here's the basic tax framework most new traders get wrong.
This is general information, not tax advice — consult a CPA. With that said:
1099 income: Prop firm payouts are reported on 1099-MISC or 1099-NEC, not 1099-B. They are treated as self-employment income, not capital gains. This matters because: (a) you pay self-employment tax (~15.3%) on top of regular income tax, and (b) you cannot offset with Schedule D capital losses.
Set aside 30% of every payout the day it lands: this is the rule-of-thumb minimum for federal + self-employment tax. Higher-income states add 5–10% more. Open a separate 'taxes' savings account that you never touch except for quarterly estimated payments.
Quarterly estimated taxes: Self-employment income above $1,000/yr triggers quarterly estimated tax requirements. Due dates: April 15, June 15, September 15, January 15. Use IRS Form 1040-ES.
Deductibles for the prop firm trader:
Challenge / evaluation / reset fees — paid as a business expense if you operate as a sole proprietor or LLC.
VPS hosting, trading platforms (Tradovate, TradingView, etc.), market data fees.
Education / coaching that's directly related to trading (be careful with this — must be ordinary and necessary, not personal hobby).
Home office if you have a dedicated space (use the simplified deduction unless you have an accountant).
Internet, phone (the portion used for business).
What's NOT deductible: Losses on prop firm accounts (because the prop firm absorbs the losses, you only get the payouts). This trips up many new traders.
LLC vs sole proprietor: Most starting prop traders are fine as a sole proprietor. Consider an LLC + S-Corp election only once your annual trading profit exceeds $40K — at that point the S-Corp self-employment-tax savings can offset the setup cost.
Track every expense from day one. Use a free tool like Wave or QuickBooks Self-Employed. The single biggest tax mistake we see is traders who don't track expenses and overpay by thousands.