Markets Desk
Markets desk
Why Costs Decide More Trades Than You Think
Trading costs come out of your account on every trade, whether that trade wins or loses. They are not a market variable you can be right or wrong about — they are a fixed drag on returns that compounds with volume. A strategy that is marginally profitable before costs can be a loser after them, which is why the choice of broker and account type is a P&L decision, not a convenience one.
This guide is written from the trader's side of the ledger: how each cost reduces your net return, and how to add them up into a single figure you can compare across brokers. For the broker-side breakdown of how each fee is structured and why brokers charge it, see our broker fees explained guide. This page focuses on the impact on your P&L and on making a like-for-like comparison.
The Full Cost Stack, From a P&L View
Every euro of cost falls into one of these categories. Which ones dominate depends entirely on how you trade.
| Cost | When it hits | Who it hits hardest |
|---|---|---|
| Spread | Every trade, paid on entry | All traders |
| Commission | Every trade, per lot | Raw / ECN account holders |
| Swap / overnight financing | Each night a position is held | Swing & position traders |
| Currency conversion | On P&L in a non-base currency | Traders whose account currency differs from the instrument |
| Non-trading fees | Deposits, withdrawals, dormancy | Everyone, situationally |
| Slippage & execution | At the moment of fill | All traders, worst around news |
Spreads: The Cost You Pay on Every Entry
The spread is the gap between the bid and ask price. You cross it the instant you open a position, so the trade starts fractionally in the red before the market has moved. For a strategy taking many trades, the spread is usually the single largest recurring cost.
Raw vs all-in spreads
Raw-spread accounts (also called ECN or Razor) display the near-raw interbank spread and charge a separate commission. Standard accounts quote a wider spread with no commission — the cost is the same idea, packaged differently. The mistake is comparing a raw spread against a standard spread as if they were the same number; on a raw account you must add the commission back in to see the real cost.
Advertised minimum vs average
A spread quoted "from 0.0 pips" is a best-case figure seen only in the deepest liquidity of the London-New York overlap. The number that decides your costs is the average spread across the hours you actually trade. Brokers that publish monthly average spread data are the ones worth comparing; those showing only minimums are usually hiding a less flattering average. For live average-spread rankings, see our lowest-spread EU brokers comparison.
Commissions: Read the Quoting Convention
On raw and ECN accounts the broker charges a flat commission per lot. The trap is the quoting convention: a commission quoted per side is charged twice per trade (open and close), so a "per side" figure looks half as expensive as the equivalent "per round turn" figure. Always normalise to the round-turn number before comparing brokers.
To see the total, add the average spread cost in your account currency to the round-turn commission. A wider raw spread with a low commission can beat a tighter raw spread with a high commission, or vice versa — the headline spread on its own tells you nothing. If you prefer to avoid per-trade commission entirely, compare zero-commission EU brokers, and note that the cost simply moves into the spread. Traders who value predictable costs may prefer fixed-spread brokers, where the spread does not widen with volatility.
Swap: The Cost That Grows Every Night
Swap, or overnight financing, is charged or credited each night you hold a position past the daily rollover. It reflects the interest differential between the two currencies, adjusted by a broker markup that usually makes retail swaps negative in both directions. On the settlement night the charge is tripled to cover the weekend.
For a day trader who closes out before rollover, swap is irrelevant. For a swing or position trader it can quietly become the dominant cost, exceeding the spread many times over across a multi-week hold. This is where two brokers with identical spreads can have very different true costs for the same strategy. For the full mechanics and how to manage it, see our swap rates guide.
The Hidden Costs That Escape the Headline
Weekend and news-time spread widening
Spreads are not constant. They widen sharply around the Friday close, the Sunday reopen, and high-impact economic releases, when liquidity thins out. A pair that costs a fraction of a pip mid-session can cost several pips at those moments. If you hold or trade around them, the average you pay is well above the mid-session figure.
Currency conversion
If your account is denominated in EUR but you trade a USD-quoted instrument, each realised profit or loss is converted, and the broker typically applies a percentage markup on that conversion. Over many trades this adds up. Matching your account currency to the instruments you trade most, or choosing a broker offering multiple base currencies, removes it.
Non-trading fees
Inactivity fees kick in after a dormant period and quietly erode a balance you are not actively using. Some withdrawal methods carry a charge even where deposits are free. Neither appears in a spread comparison, so check the fee schedule for the payment methods you intend to use.
Guaranteed stop-loss premiums
A guaranteed stop-loss order fills at your exact price regardless of gapping, but the broker charges for that certainty through a wider spread or an explicit premium. For most retail traders a standard stop is sufficient; the guaranteed version is a cost you opt into consciously, not a default.
How Costs Eat Returns: A Worked Example
The figures below are illustrative and rounded for clarity — they are not quotes from any specific broker. Use them to see the mechanism, then run your own numbers with real average spreads from the comparison pages.
All-in cost per round turn = (avg spread in pips x pip value) + round-turn commission
Monthly cost = all-in cost per round turn x round turns per month
Annual cost = (monthly cost x 12) + swap on nights held + non-trading fees
Take an illustrative active trader running 20 standard-lot round turns a month on a major pair. On Broker A the average spread works out to roughly 0.2 pips (about USD 2 per lot) plus a USD 6 round-turn commission — an all-in USD 8 per round turn, or USD 160 a month, roughly USD 1,920 a year. On Broker B with a 0.1 pip average spread but a USD 7 commission, the all-in is USD 8 as well — the tighter spread did not make it cheaper. Only by adding the two components does the comparison hold up.
Now add holding. If that trader is a swing trader carrying positions four nights a week, negative swap can add materially to the annual figure and can flip which broker is cheapest, because swap markups vary far more widely between brokers than spreads do. This is the core reason to compare on your own trading pattern rather than on a single advertised number.
How to Compare Brokers on True All-In Cost
Reduce every broker to a single all-in figure for the way you actually trade, then compare those figures. The steps:
- Use the average spread, not the minimum. Pull live average-spread rankings from our lowest-spread comparison.
- Add the round-turn commission. Normalise per-side quotes to a round turn first. Compare a zero-commission account against a raw account on the combined figure, not the spread alone.
- Weight swap by your holding period. If you hold overnight, swap can outweigh the spread — see the swap rates guide. If you value cost certainty, weigh a fixed-spread broker.
- Model it with your own volume. Our trading-cost calculator turns spread, commission and volume into an annual figure you can compare directly.
- Check the non-trading fees last. Inactivity, withdrawal and conversion charges can undo a small spread advantage. The broker fees guide sets out the full fee taxonomy.
Which Costs Matter for Your Trading Style
Scalpers & day traders
Spread and commission dominate; swap is near-irrelevant. Optimise for the tightest all-in cost per round turn and reliable execution.
Swing traders
Spread still matters, but swap on multi-day holds becomes a real cost. Compare swap rates as carefully as spreads.
Position traders
Swap is usually the dominant cost; spread matters far less. Watch for inactivity fees during quiet periods and consider swap-free accounts.
Occasional traders
Per-trade costs matter less, but non-trading fees — inactivity in particular — can be the largest cost of all. Choose a broker that charges none.
Frequently Asked Questions
- What is the true cost of a forex trade?
- The true cost of a forex trade is the spread plus any commission, plus overnight swap for every night the position is held, plus any currency conversion on the profit or loss. Slippage and non-trading fees such as inactivity or withdrawal charges add to the total over time. Comparing brokers on the headline spread alone is misleading; you should compare the all-in cost per round turn for the pairs and holding period you actually trade.
- Are raw-spread accounts cheaper than commission-free accounts?
- Not always. Raw or ECN accounts show a near-zero spread but charge a separate commission, while commission-free standard accounts embed the broker's revenue in a wider spread. The cheaper option depends on your volume and pairs. Add the average spread cost to the round-turn commission and compare that single all-in figure. A tighter headline spread does not guarantee a lower total cost.
- Do trading costs really affect my returns that much?
- Yes. Costs are deducted every trade regardless of whether the trade wins or loses, so they compound with volume. An active trader running dozens of round turns a month pays the spread and commission on each one, and swap on every night held. Over a year the difference between a low-cost and high-cost broker on the same strategy can run into hundreds or thousands of euros, all of which comes directly out of net return.
- Which forex costs are hidden or easy to overlook?
- The most commonly overlooked costs are overnight swap on multi-day holds, currency conversion when your account currency differs from the instrument, widened spreads around the weekend and major news, guaranteed stop-loss premiums, and inactivity fees during quiet periods. These rarely appear in a broker's headline marketing but can exceed the spread for certain trading styles.
- How do I compare forex brokers on true cost?
- Use the average spread rather than the advertised minimum, add the round-turn commission, and factor in swap for your typical holding period. Match the comparison to your own trading style: scalpers weight spread and commission, position traders weight swap. Our lowest-spread, zero-commission and fixed-spread comparison pages publish live figures, and the trading-cost calculator lets you model your own volume.
CFD Risk Warning
CFDs are complex instruments and come with a high risk of losing money rapidly due to leverage. A high percentage of retail investor accounts lose money when trading CFDs. You should consider whether you understand how CFDs work and whether you can afford to take the high risk of losing your money.
This website is for informational purposes only. The content does not constitute investment advice. Trading leveraged products carries a high level of risk and may not be suitable for all investors. Past performance is not indicative of future results. EU retail leverage limits apply (ESMA): up to 30:1 on major FX pairs, 20:1 on minor FX, 20:1 on major indices, 10:1 on commodities, 5:1 on equities, 2:1 on crypto.
Compare on True Cost
Pull live average spreads, model your own volume, and find the lowest all-in cost for the way you trade.