BRYME Money · Broker & platform checks
Trading fees explained: the cost beyond commission
A zero-commission label is not a zero-cost trade. Price the full round trip.
Trading has a bill even when a ticket says 'commission: $0'. The full comparison is the expected round-trip cost for your product, order size, holding period and account currency. Broker charges and the market's own bid-ask spread are related but not the same line item.
The costs to separate
- Bid-ask spread: the gap between the price offered to a seller (bid) and the price asked of a buyer (ask). Buying at the ask and immediately selling at the bid creates a loss even if the market midpoint does not move. The SEC explains this in its retail FX guide.
- Commissions and exchange fees: a fixed or percentage charge, sometimes on both entry and exit; not all displayed prices include it.
- Slippage: the difference between the planned reference price and the actual fill, which can favour or hurt you. A stop-market is particularly exposed in a gap; see order execution.
- Financing: margin interest on borrowed securities, or overnight funding/rollover terms on some FX and CFD products. The cost can vary by side, day, provider and benchmark.
- Currency and account charges: FX conversion markup, data/subscription charges, inactivity, transfer or withdrawal charges. The SEC's brokerage account guide lists examples of account and transaction fees.
Worked example: a flat market still costs money
Suppose a hypothetical share has a bid of $49.98 and an ask of $50.02, both quotes stay unchanged, and a trader buys 100 shares at the ask then sells 100 at the bid. The cash difference is ($50.02 − $49.98) × 100 = $4. Add a hypothetical $1 commission to enter and $1 to exit and the total immediate loss is $6 before any price movement, conversion or tax. It would be incorrect to calculate the loss using those actual fill prices and then deduct the $4 spread a second time; the spread is already in the fills.
| Item | Calculation | Cost |
|---|---|---|
| Bid-ask difference | ($50.02 − $49.98) × 100 | $4.00 |
| Entry + exit commission | $1 + $1 | $2.00 |
| Total in this example | Before financing, FX or slippage | $6.00 |
Compare quotes without pretending they are guarantees
Request the current fee schedule and examples for the product and entity that would service your account. Note whether the advertised spread is a minimum, representative figure or live quote; check the market hours that matter to you. Price both opening and closing legs, any holding charge for your intended duration and conversion into the account currency. For FX, our pip example converts a spread into quote-currency money. For CFDs, ASIC MoneySmart highlights commissions, spreads and overnight financing as potential costs.
Small targets are especially sensitive to costs. If a strategy's gross historical gain per trade is less than a plausible round-trip cost, its apparent edge disappears before it reaches the account. A backtest using only one fixed spread or perfect fills can still be too optimistic; include a range of spreads, slippage scenarios and missed orders in the testing plan.
Sources and further reading
Links were reviewed 2026-09-24. Regulatory permissions, firm status and product terms can change; use the current official register before acting.
General information, not financial advice. Everything on BRYME Money is educational. Trading forex, crypto and derivatives involves substantial risk of loss and is not suitable for everyone. Past performance — including any published research — does not guarantee future results. Never trade money you cannot afford to lose.