You pass a one-step prop firm challenge by keeping your risk per trade small enough that the 7.5% maximum loss can absorb a losing streak, then letting the 10% profit target arrive over five or more trading days instead of forcing it into two.
I have spent 37 years on institutional FX desks and have mentored more than 1,000 traders since 2009. A prop firm challenge is not a market-prediction test. It is a capital-preservation test with a profit target bolted on. The one-step is the purest version of that, because there is only one stage: one 10% target, one 7.5% floor, and no second phase to absorb a bad patch.
Most of what is written about the one-step treats it as the "fast" challenge. That framing is the single biggest reason people fail it. Speed is the one thing the structure does not reward. Here is what the product actually is, the arithmetic I would run before paying for one, and the sequence I would trade.
A one-step challenge — also called a one-phase challenge — is a single evaluation phase: one 10% profit target, one 7.5% maximum loss, and the account is funded when you hit the target. A two-step splits the same job into 10% and then a further 5%.
The limits underneath are identical. This is the part traders get wrong: the model does not change the rules, it changes how many phases you pass to be funded.
| Rule | One-step | Two-step | | Profit target | 10% | 10%, then 5% | | Maximum loss | 7.5% (5.0% on the $1M account) | 7.5% (5.0% on the $1M account) | | Daily loss limit | 2.5% | 2.5% | | Minimum trading days | 5 | 5 | | Time limit | None | None | | Consistency rule | Over 50% of profit in one day = not funded | Same | | One-time fee, $100,000 account | $600 | $500 |
Two details carry more weight than the rest combined. There is no time limit, so patience is free. And the minimum is five trading days, so a four-day blitz is not a pass however much profit it makes.
This is the mechanic almost nobody explains, and it changes how you should trade the thing.
On a $100,000 account the loss floor starts at $92,500. It does not sit still. Every new balance high lifts the floor by the same amount, one for one. It stops rising when it reaches your starting balance, and from that moment it is locked permanently at breakeven. It never trails back down when you lose.
Work the numbers:
Two conclusions fall straight out of that table.
First, a winning run does not buy you more room. For the first 7.5% of the climb the floor chases you one for one, so your dollar cushion stays fixed at $7,500 and shrinks slightly as a percentage of your balance. This is the exact opposite of what most traders assume. They win four trades, feel the account is "paid for", and double their risk. On this structure they have bought themselves nothing.
Second, the real milestone is not the target — it is $107,500. The moment your balance first touches that level the floor locks at breakeven and your starting capital can no longer be lost. The final 2.5% of the challenge is therefore the safest part of it. Your job in the first 7.5% is simply to survive; from there, the structure works for you rather than against you.
That is a one-stage product, so this shape matters more than it does on a two-step, where passing phase one re-bases the floor onto the advance and hands you a buffer to trade phase two with.
Most traders choose a position size by asking how fast they can make 10%. The right question is how many losses the account can absorb before the floor takes it.
On a $100,000 one-step:
| Risk per trade | Losses that exhaust the 7.5% limit | Losses that exhaust the 2.5% daily cap | | 1.0% ($1,000) | 7 | 2 | | 0.75% ($750) | 10 | 3 | | 0.5% ($500) | 15 | 4 | | 0.25% ($250) | 30 | 10 |
Read the daily column carefully, because that is the limit that ends most one-step attempts. At 1% risk, two losing trades and you are done for the day. At that size a routine three-loss morning is a breach, and a breach is a failed evaluation — a new fee, not a warning.
At 0.5% risk the account tolerates fifteen losing trades in total and four in a single day. That is a size you can trade a real process on.
Here is the arithmetic that shows why 0.5% is enough. Hypothetical $100,000 account, 0.5% risk per trade, average winner twice the size of the average loser.
Now check it against the consistency rule. At a 60% win rate over five trades a day, a typical day is three winners and two losers: +$3,000 - $1,000 = +$2,000. Your best day is $2,000 against a $10,000 total — 20% of the profit. Well inside the 50% ceiling, with no single day carrying the result.
That is the whole method. It is not clever. It is just sized so that being wrong repeatedly is survivable.
The consistency rule says no more than 50% of your total profit may come from any single day. It applies to both models, but it catches one-step traders far more often, and the reason is psychological.
The one-step is marketed as the faster route. So the trader who picks it is usually the trader in a hurry. They open with an oversized position, catch a 6% day, and think they are 60% of the way home.
They have failed the pass gate. With a 10% total profit, your best day cannot exceed 5%. A 6% day is 60% of the result. The account survives — the rule is a pass gate, not a breach — but the pass does not count.
That is a nasty way to lose an evaluation you traded well enough to earn. The fix is structural, not moral: decide before you start that no single day will be allowed to deliver more than a third of the target. At a $100,000 account that is a $3,300 daily stop on profit-taking. Take it, close the terminal, come back tomorrow. Leave yourself the margin.
The one-step costs 20% more than the two-step at the same account size. On $100,000 that is $600 against $500. On $1,000,000 it is $6,000 against $5,000.
A failed evaluation is not refunded. You buy a new one at the normal price. So the number that actually matters is not the fee, it is the fee divided by your pass rate — your expected cost per funded account.
That gives you a clean test. The one-step only pays for itself if it is at least 20% more likely to pass than the two-step, because that is exactly how much more it costs:
$600 / pass rate (one-step) must beat $500 / pass rate (two-step)
Work an example with your own numbers. If your two-step pass rate is 15%, the two-step costs you $3,333 per funding. For the one-step at $600 to match that you need roughly an 18% pass rate. If your honest one-step pass rate is 12%, you are paying $5,000 per funding instead of $3,333 — the "faster" product is 50% more expensive per result.
For most traders a single 10% stage is not 20% easier than two stages, because the two-stage structure gives you a re-based floor for phase two. That is the trade: the one-step removes a phase, and removes the recovery room with it.
Choose the one-step if your worst historical drawdowns sit well inside 7.5%, you can hold one high-stakes stage without over-sizing, and you have the discipline to spread the profit. Choose the two-step if your strategy routinely swings 6-8% and needs room to recover, or if the lower fee matters more than the single stage.
Five rules, in order of importance.
Past performance is not indicative of future performance. Trading involves risk, an evaluation can be failed, and the fee is not refunded.
The bottom line: the one-step challenge does not reward speed, it rewards survivability — pick a size where fifteen losses do not kill the account, spread the profit across five days so no single one breaks the 50% rule, and remember that a winning run gives you no extra room until the floor locks at breakeven.
Written by Brad Gilbert, Founder & Head Trader at Traders4Traders — 37 years trading, twenty of them for investment banks, mentoring 1,000+ traders since 2009.
A one-step prop firm challenge is a single evaluation phase with one profit target and one maximum loss. In the T4T model it is a 10% profit target against a 7.5% maximum loss, a 2.5% daily loss limit, no time limit and a minimum of five trading days. Hit the target within those limits and the account is funded.
No single trading day may account for more than 50% of your total profit. With a 10% target, your best day therefore cannot exceed 5%. The rule is a pass gate rather than a breach: the account survives, but the pass does not count if one day carries too much of the result.
No. Every account requires trading on at least five separate days, and the 50% consistency rule caps any single day at half of your total profit. A very large one-day gain also breaches the 2.5% daily loss logic in reverse, by making the pass dependent on one session.
It is not harder per percentage point, because the limits are identical, but it removes the recovery room. A two-step re-bases the loss floor after phase one, which gives you a buffer to trade phase two with. A one-step puts the whole 10% target inside a single 7.5% envelope.
It costs 20% more at the same account size, because you are asking to be funded in one pass instead of two. On a $100,000 account that is $600 against $500. A failed evaluation is not refunded, so the fee that matters is the fee divided by your pass rate, not the headline price.
On a $100,000 account, 0.5% risk per trade means fifteen consecutive losses exhaust the 7.5% maximum loss and four exhaust the 2.5% daily limit. At that size a 60% win rate with a 2:1 reward-to-risk ratio produces the 10% target in roughly 25 trades.
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