How to Backtest an MT5 EA
A backtest is evidence, not proof. Use clean data, realistic costs and out-of-sample tests before trusting a generated EA.
Updated 2026-11-04 · Free builder guides · No signup required
Start with clean data
Backtest quality is capped by data quality. Check duplicate timestamps, gaps, OHLC violations and zero spread/volume before trusting the result. Use the data quality reports or the quality API.
Choose the right modelling mode
- Every tick based on real ticks for intrabar-sensitive EAs.
- 1 minute OHLC for faster rough tests.
- Open prices only for simple bar-open systems.
Always include spread and commission. A strategy that only works at zero spread is not a strategy.
Avoid overfitting
- Do not optimise and validate on the same data.
- Use walk-forward windows.
- Limit the number of optimised parameters.
- Check trade count, drawdown and expectancy, not only net profit.
- Test across different market regimes.
Backtest Guide FAQ
How long should I backtest?
Long enough to include different volatility regimes. More importantly, keep an untouched out-of-sample period.
Are real ticks necessary?
For intrabar logic, yes. For simple bar-close systems, 1-minute OHLC may be enough for a first pass.
Can a backtest guarantee live results?
No. Execution, slippage, latency and market changes can differ.
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