Direct answer
You typically do not choose “spread or commission” yourself; you choose (or end up with) a broker pricing model. In forex, one model may charge a commission and use a smaller spread, while another may charge no commission and rely on a wider spread. The practical question is which setup gives a lower total trading cost for your trading style and conditions.
How spread and commission work
Spread is the difference between the bid price (what the market pays you for selling) and the ask price (what it charges you for buying). The trader’s cost is embedded in that difference: you effectively buy at the ask and sell at the bid.
Commission is a separate fee that some brokers add per trade (for example, per lot or per unit). In commission-based models, the quoted spread may be tighter, but you still pay the commission on top.
Because these costs interact, the right comparison is not “which fee is better,” but which pricing structure produces the lower effective cost over comparable trades.
Comparing them with simple checks
A useful way to compare spread vs commission is to look at them as two parts of a single total cost:
- Execution cost: In spread-only models, cost mostly appears in the spread size you receive.
- Explicit fee: In commission models, you also see an explicit commission line item.
- Effective cost across the round trip: Consider a buy and a sell (or any comparable entry/exit) because spread is paid each time you transact.
- Variability: Spreads can change with market conditions. Commission-based models can also vary by volume or account setup.
To verify what you will pay, read the broker’s published fee schedule and pricing definitions for your specific account type, then compare total costs on the same instruments under similar conditions.
If you want more clarity on terminology, you can look for pages explaining commission vs spread and the meanings of common commission terms used by forex brokers.