How to backtest a strategy for a prop firm challenge
A prop firm challenge is a short, rule-bound test of a strategy. A good backtest tells you whether it can pass before you pay. A careless one gives you false confidence and a lost fee.
Use enough trades
A few dozen trades can't separate skill from luck. Aim for at least 200 trades, and ideally a year or more of data that includes trending, ranging and volatile periods. If the strategy trades rarely, test it across several years or several markets.
Include every cost
- Spread: use realistic or variable spreads, not the tightest possible.
- Commission: most prop firm accounts charge per lot on forex and metals.
- Swap: holding overnight costs or earns swap; for swing strategies it adds up.
- Slippage: stop orders and news trades fill worse than the test shows.
In MetaTrader 5, the "every tick based on real ticks" model is the most accurate for short-term strategies.
Size the test like the challenge
Run the backtest on a balance that matches the account you plan to buy, with the risk per trade you plan to use. PropPassCheck can rescale your results, but a test run at realistic size avoids surprises such as lot-size rounding on small accounts.
Keep dates
Daily loss limits work by trading day, so your export needs the close time of each trade. Without dates, a tester can only guess how trades fall into days.
Avoid overfitting
- Keep the number of settings small. Every extra setting makes it easier to fit the past by accident.
- Optimise on one period and confirm on another the strategy hasn't seen (out-of-sample testing).
- Be suspicious of results that are smooth and almost never lose. Real strategies have losing months.
- Check that small changes to the settings still give a profit. If only one exact value works, the edge probably isn't real.
Forward test if you can
A few weeks on a demo account shows whether live fills, spreads and your own execution match the backtest. Forward results can be exported and tested in exactly the same way.
Read the results the right way
The question isn't "did this backtest make money" but "how often would these trades pass the challenge, given the rules". The test centre answers that by replaying your trades thousands of times in different orders, and once in their real order. Read why the order of your trades matters to understand both numbers, and how to export your trades to get your file.
More guides
- Why most traders fail prop firm challenges
- How much to risk per trade on a prop firm challenge
- How to pass a two-step prop firm challenge
- Prop firms for swing traders
- How trailing drawdown works, and why it catches traders out
- One-step vs two-step prop firm challenges
- Instant funding: what's the catch?
- Prop firm consistency rules explained