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Broker commissions are included in every backtest by default, so results are closer to what you’d actually see in live trading. You can also configure commissions in more detail for a specific scenario — for example, to match a particular broker’s fee schedule. Combined with the platform’s unified backtest / live logic, this is meant to close the usual gap between “looks great in a backtest” and “holds up in live trading”: the same cost model applies in both places, rather than costs being an afterthought bolted on to the results screen.
A realistic cost model reduces — but doesn’t eliminate — the gap between backtest and live results. No backtest reproduces the future with full accuracy.