“Up to 90% profit split” is the most quoted number in prop firm marketing, and the most misunderstood. The split is only one of four factors that decide what you actually take home: the split itself, how the balance behaves after payout, fees on the payout, and whether you survive the rules long enough to collect. Here is the full math.
What a profit split actually is
A funded account is the firm’s capital. When you make profit on it, the firm owns that profit, and your agreement pays you a share of it. An 80/20 split means on $10,000 of verified profit, $8,000 is yours and $2,000 goes to the firm. Unlike a personal account, where all profit and all loss are yours, a funded account caps your downside at the evaluation fee while capping your upside at the split.
Where the split quietly shrinks
First: the split applies to profit, not balance. Some traders mentally apply it to the whole account, which inflates expectations by 10x. Second: payout fees. Some firms deduct processing or platform fees per payout, which matters most on small payouts, a $30 fee on a $400 payout is 7.5% off the top. Third: consistency and scaling conditions. Some firms reduce your share for a period if rules were narrowly missed or if the account goes inactive. Fourth: the balance reset. Most firms reset your balance to the starting amount after every payout, so your next cycle starts from scratch, and your income is per-cycle, not compounding on the full account.
The year math
Take a $100,000 funded account, an 80% split, and a trader who reliably earns 4% per month and takes it all out. Per cycle: $4,000 profit, $3,200 to you. Per year: about $38,400 take-home from one account. The same trader “keeping profit to compound” sees the balance grow to roughly $155,000 in twelve months on paper, but with a trailing drawdown that growth also lifts your risk floor. Run both paths yourself in the compounding calculator and check your own split with the profit split calculator.
Scaling plans, honestly
Scaling plans promise bigger splits (90%+) and bigger accounts (up to $2M+) after consistent payouts. Treat the first payout or two as the part you can plan on; treat the scaling tiers as upside, because each tier usually adds conditions (consistency across more months, minimum trade counts, drawdown checks). A 90% split you reach for years is worth less than an 80% split you collect monthly.
The takeaway
Judge a firm by the realistic take-home per cycle, not the headline split: split × realistic monthly profit × payout frequency, minus fees. And judge your own plan by whether you survive the drawdown rules long enough to collect, which is the risk of ruin question.
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Educational content only, not financial advice. See our disclaimer.