5 Backtesting Mistakes That Destroy Your Live Trading Results (Backtesting Like the Pros)
Why professional backtests survive live trading (and amateur backtests don't)
First, thank you all! 2025 has been amazing.
Over 1,000 YouTube subscribers, 1,500+ Substack subscribers, and a community of systematic traders who genuinely care about building strategies the right way.
The response blew past my expectations. It’s wild (and motivating) to see how many serious traders are out there putting in real work.
2026 will be even bigger. We're just getting started.
To start the year strong, let’s talk about something that comes up constantly:
Why most backtests look great on paper but fail the moment they go live.
Most backtested strategies show impressive results. The equity curves climb steadily upward, Sharpe ratios exceed 3.0, and maximum drawdowns stay comfortably below 5%.
Then they go live and fall apart within months.
Professional quantitative traders follow specific practices that most new/retail traders either don’t know about or choose to ignore.
Here are the five most critical mistakes, ranked from common to catastrophic.