Fees & Slippage Modeling: Why Backtests Lie

📅 2026-08-12 · SmartQuant Academy

TL;DR: TL;DR: A backtest without realistic fees and slippage is fiction. Model fees on both sides, estimate slippage from ATR/spread, and include funding rates to see a profitable strategy turn into a losing one.

❓ FAQ

Why do my backtests look too good?

Missing fees, slippage, and funding costs. Always model them.