Category: Guides

Win rate is the stat traders brag about; risk of ruin is the stat that decides whether the account still exists in six months. It is the probability that a strategy, with its exact win rate and reward-to-risk, hits your account’s ruin threshold before it profits.

The formula

Edge per unit risked = (win rate × reward-to-risk) − loss rate. Risk of ruin ≈ ((1 − edge) ÷ (1 + edge))^N, where N is how many of your risk units the drawdown limit absorbs. Example: 45% win rate at 2:1 gives edge 0.35. On an account whose 10% limit survives ten 1% losses: 0.65¹⁰ ≈ 1.3% risk of ruin. Same strategy at 2% risk: cushion of 5 losses, 0.65⁵ ≈ 11.6%. Same trading, ten times the death probability. Compute yours with the risk of ruin calculator.

Why cushion beats win rate

Traders chase win rate because losses feel like failure. The math disagrees about what to fix first: going from 45% to 55% win rate at 2:1 cuts risk of ruin by roughly half; halving your risk size cuts it by a power. Cushion is the variable you control today, at zero cost to your strategy.

Streaks are normal

A 45% win-rate strategy produces losing streaks of 8-10 trades several times per thousand trades, regularly enough to meet in a normal year. If your cushion is five losses, you are not unlucky when it happens, you were structurally doomed. This is the real reason evaluation passers trade 0.25-0.5% risk: they are buying enough streak insurance for the expected trade count to actually finish the target.

The honest conclusion

No positive-expectancy strategy is “safe” at too large a size, and no negative-expectancy strategy is saved by small size. Risk of ruin is where position sizing (see the position sizing guide), drawdown rules (see the drawdown guide) and your payout plan all meet. It is the number to check before the first trade of any funded cycle.

Educational content only, not financial advice. See our disclaimer.

Getting funded is the headline. Collecting is the business. Payout math has more moving parts than most traders expect, and each one changes what lands in your bank account.

The payout cycle

A typical cycle: you request a payout after meeting the firm’s minimum profit threshold (often 2-6% of the account), the firm verifies you broke no rules, sometimes requires account statements, then processes payment to your bank, crypto or payment platform. Cycles are usually 14 or 30 days for the first payout, then faster after trust is established.

The five deductions nobody advertises

One: your split, 80% is common, so $5,000 profit becomes $4,000. Two: processing fees, flat or percentage, small on large payouts, painful on small ones. Three: the consistency rule, if any single day contributed more than the allowed share (30-45%) of your payout-period profit, the request can be held until it no longer dominates. Check yours with the consistency rule calculator. Four: platform or data fees charged monthly against the account. Five: taxes, which are entirely yours wherever you live.

Balance reset changes everything

On most funded programs your balance resets to the starting size after each payout and the drawdown floor typically stays anchored near it. Consequences: your per-cycle income does not compound on the account, your sizing must be recomputed from the reset balance (a common error after the first payout), and your annual income is cycles × take-home per cycle. Verify your own cycle numbers with the profit split calculator and the compounding calculator.

How top funded traders structure income

Treat each account like a product with a per-cycle yield: realistic monthly take-home 2-5% of account value, collected every cycle, never left exposed to a trailing drawdown. Then either scale within the firm’s plan or run multiple accounts, sizing each as its own independent risk unit per the risk of ruin framework.

Educational content only, not financial advice. See our disclaimer.

Position sizing is the single highest-leverage skill in prop trading. Strategy decides your edge; sizing decides whether the account survives long enough for the edge to express itself.

The core formula

Lot size = (account balance × risk %) ÷ (stop loss in pips × pip value per lot). On a $100,000 account risking 0.5% ($500) with a 40 pip stop where a pip is worth $10 per lot: $500 ÷ $400 = 1.25 lots. Change any input and the size changes proportionally: the same dollar risk on an 80 pip stop is 0.62 lots. Compute your own numbers with the position size calculator.

Pip values and point values

For USD-quoted majors (EURUSD, GBPUSD), one pip is $10 per standard lot. For pairs where USD is the base (USDJPY), pip value floats with the rate and must be computed. For indices and gold, use the dollar value per point per lot from your broker’s contract specifications. Getting this wrong by 2x doubles your actual risk silently, which is how a “1% risk” plan fails an evaluation at trade five.

Which risk percentage passes

With a 10% total drawdown and 5% daily limit, per-trade risk of 0.25-0.5% means it takes 20-40 consecutive losing trades to hit the total limit, which no realistic strategy produces. At 2% risk, five losing trades is a breach, and losing streaks of five happen to every strategy. The risk of ruin calculator shows the exact probability for your statistics.

The four classic sizing mistakes

One: sizing from the stop you want rather than the stop your chart needs (moving stops to “afford” size). Two: rounding lot sizes up. Three: sizing in lots from a previous account balance after a payout reset. Four: increasing size after losses to “get it back”, which is the fastest known route past a daily loss limit. Every one of these is a formula error, not a character flaw, and every one is checkable before the trade.

Educational content only, not financial advice. See our disclaimer.

Drawdown rules kill more funded accounts than bad strategies do, because traders read the percentage and never compute the dollar line. Here are the rule types and the arithmetic behind each one.

Total drawdown: static vs trailing

Static drawdown is fixed from the starting balance: on $100,000 with 10% max drawdown, the floor is $90,000 for the entire life of the account, whether you are up $2,000 or $20,000. Trailing drawdown moves with your equity or high-water mark: at a $112,000 peak, your 10% floor trails up to $102,200 (depending on whether the firm trails to the target or indefinitely), which means a profitable account can still be one bad session from breach. Static floors favor steady compounding; trailing floors favor early, frequent payouts.

Daily loss limits

Daily drawdown is measured from your day-start equity or balance, resets every firm-defined day (often midnight server time, 5pm New York), and is usually smaller than the total limit: 5% daily against 10% total is common. The daily limit is what actually ends accounts, because two or three oversized losing trades can consume it in a single session. Check your exact remaining room with the daily loss limit calculator.

Worked example: the trailing trap

You pass phase two and get $100,000 with 10% trailing drawdown. You run it to $118,000; your floor is now $108,000. A news spike takes $9,500 in a day: you are at $108,500, still up $8,500 lifetime, but only $500 from breach. Traders in this exact position, up money and nearly dead, is the classic funded account failure mode, and it is entirely predictable arithmetic. Compute your current floor any time equity makes a new high with the max drawdown calculator.

The two habits that keep accounts alive

First: convert every rule to dollars on day one and re-check the trailing floor whenever you make a new equity high. Second: set your personal daily stop at 40-60% of the firm limit. Passing evaluations is mostly about not losing fast; the position size calculator keeps each trade’s contribution to the limits small and predictable.

Educational content only, not financial advice. See our disclaimer.

“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.

Educational content only, not financial advice. See our disclaimer.