Trading costs include commission, exchange, clearing, regulatory, swap, financing, funding, stock-borrow, and other broker fees. Broker-reported values take priority component by component. A verified schedule can fill a missing component only when it exactly matches the provider, entity, plan, product, instrument, and trade date.
Which components belong in trading costs?
Commission and fixed exchange, clearing, and regulatory fees may apply when the trade carries the quantity, contract, instrument, currency, and execution-role data the schedule requires. Dynamic swap, financing, stock-borrow, and funding apply only from broker-reported values or complete authoritative historical rates. Missing inputs stay unavailable rather than becoming zero or an estimate.
Why do costs decide who survives?
Because they hit every single trade, win or lose. A +0.3R edge sounds healthy until 0.1R of cost turns it into +0.2R, a third of your edge gone before you've done anything wrong. High frequency systems live and die here. Trade 500 times a year at an extra tick of cost each and it compounds into a heavy drag. The slower you trade and the bigger your average winner, the smaller costs will be.
How do you deal with them?
Start with broker-reported components. If one is missing, use only an exact verified schedule that matches the trade. Never extrapolate from partial coverage. Recompute from immutable gross values so an included or reported amount is not subtracted twice. The honest test is simple: does the strategy still make money after every available cost is applied?
Frequently asked questions
Related terms
- R Multiple — Every trade measured against what you risked, where a full stop is always minus 1R.
- Slippage — The gap between the price you expected and the price you actually got.
- Live vs Backtest — The gap between how a strategy looked in testing and how it performs with real money.
- Forward Testing — Running a strategy on new market data in real time, before you risk real money on it.