Forex trading costs come in three kinds, and none of them shows up on the chart: the spread, the commission and the swap. You do not see them, but all three come out of your account.
On long-term methods these costs barely register. On short-term methods with tight stops, these three alone can turn a method with positive expectancy into a losing one, without anything else in your analysis being wrong. Below we take each one apart, and at the end we show you how to measure them against your stop loss.
The spread
The spread is the gap between the buy price and the sell price of an instrument at the same moment. You always buy at the higher of the two prices and sell at the lower one, so every trade starts slightly in the red from its very first second. That amount is the spread.
The spread is the price of liquidity, not an arbitrary number. When there are fewer people on the other side of the trade, the gap opens up. That is why the spread gets wider in these situations:
- Quiet market hours, especially between one session closing and the next one opening.
- The minutes around major economic news, when it can reach several times its normal size.
- The weekly open, especially after a weekend with big news.
- Minor instruments that fewer traders use.
Here is what that means in practice: if your stop loss is 10 pips and the spread jumps from 1 pip to 6 at the moment of a news release, you have effectively opened a trade that spent more than half of its stop distance on cost.
Fixed, floating and raw spreads
A fixed spread does not change, but it is usually higher than the floating average, and in fast markets your order may still fill with slippage. A floating (variable) spread moves up and down with the market. A raw spread sits close to zero, but you pay a separate commission in exchange, so the cost has not disappeared; it has only moved. Comparing a "zero spread" account with a "1 pip spread, no commission" account without counting the commission tells you nothing.
Commission
A commission is a set fee for opening and closing a position, usually charged per lot and quoted round trip (in and out). Its advantage over the spread is that it is predictable: you know the number in advance, and it does not multiply when the news hits.
To compare accounts properly, convert the commission into pips and add it to the spread. For example, on EUR/USD a pip on one standard lot is worth $10, so a $7 round-trip commission adds 0.7 pips. That total is your real cost of getting in and out.
The swap
The swap is overnight interest: when you hold a position from one trading day to the next, the interest rate difference between the two currencies in the pair is added to or taken from your account. It can be negative, and it can be positive.
Two things catch people off guard. First, on one day of the week the swap is charged about three times over to cover the weekend; for most forex pairs that is Wednesday night, but check which day your broker uses. Second, on trades held for days or weeks, the swaps add up and can end up larger than the spread itself, slowly eating into the profit of a trade you called correctly.
In whether trading is gambling, we flagged the swap as one piece you need to understand: it works like interest, so if that matters to you for religious reasons, take these exact mechanics to your own religious authority. The ruling is theirs to give, not ours. Some brokers offer swap-free accounts, which usually charge a different fee instead.
Now measure them against your stop
This math is simple, and almost nobody does it:
- Take the typical spread of the instrument in pips.
- Convert the round-trip commission into pips and add it.
- If the trade stays open overnight, multiply the nightly swap by the number of nights and add it.
- Compare the total with your stop loss distance.
If the total cost is a meaningful share of your stop distance, your method is structurally expensive, and you need either a higher timeframe or a cheaper instrument. This is the same math that decides whether your account is big enough in how much capital you need to start trading, and that separates a real result from a fake one in how to backtest properly.
To see the numbers on a specific trade, open the risk calculator and weigh your stop distance and position size together.
A fourth cost no fee table lists
Slippage. Your order does not always fill at exactly the price you see, especially in a fast market. This cost is not written in any table, but it shows up in your real results, and it is one reason live results almost always come out a little worse than the backtest. The CFTC's customer advisory on forex (opens in a new tab) makes the broader point about costs from the regulator's side: most retail forex customers lose money once all credits, financing charges, fees and other expenses are counted.
The market is not the only thing taking money out of your account. Three other numbers do it too, and you never see them on the chart.
Summary
The spread is the cost of liquidity and it moves; the commission is fixed and predictable; the swap is the cost of time. All three come out of your real profit, and none of them shows on the chart.
Do this once: for the instrument you trade most, get these three numbers from your own broker and compare them with your usual stop distance. If the result surprises you, your method was not the problem; its cost was. Record it in your trading journal so next time you know from data, not from a guess.
