The spread and the commission look like two different costs, but they measure the same thing — the round-trip cost of getting in and out of a position.
Ask ten retail traders how much a EURUSD round-trip costs them and you'll get ten different answers. Some quote the spread. Some quote the commission. A few quote both and add them together. Almost none quote the number that actually matters: the all-in cost of opening and closing a position, expressed in a way you can compare across accounts, brokers, and instruments.
This matters because the cost model is often the single biggest variable a newer trader can control. Strategy, market timing, and psychology take years to refine. Understanding what you pay per trade takes an afternoon.
The Spread Is a Cost, Not a Quote
When you open a EURUSD chart, you see one price. When you open the order ticket, you see two — a bid and an ask. The gap between them is the spread, and it exists because the market maker on the other side of your trade needs to be compensated for standing ready to fill you.
If EURUSD shows a bid of 1.10000 and an ask of 1.10008, the spread is 0.8 pips. If you buy at the ask and immediately sell at the bid, you lose 0.8 pips before the market has moved at all. That 0.8 pips is a cost — the same as any commission line item — it's just embedded in the price rather than shown on the invoice.
Spreads widen and tighten. They tighten when liquidity is deep — London and New York overlap on a normal Tuesday, for example. They widen when liquidity thins — the Asian session, the seconds around a scheduled data release, weekends, and the minutes after unexpected headlines. A pair that trades at 0.4 pips at 15:00 GMT+3 might trade at 2 pips at 00:30 GMT+3, and 4 pips in the ten seconds after a central-bank surprise.
Commission Is the Spread Shown on the Invoice
On a commission-based account, the broker quotes you a raw or near-raw spread and charges a separate fee per lot traded. On a spread-only account, there is no line-item commission — the broker's margin is baked into a slightly wider spread.
Neither model is inherently cheaper. They are two ways of billing for the same service. What matters is the sum.
A worked example, for illustration only:
- Account A (spread-only): EURUSD quoted at 1.2 pips. No commission. On a 1-lot round-trip, cost = 1.2 pips × $10 per pip = $12.
- Account B (commission-based): EURUSD quoted at 0.2 pips. Commission of $3.50 per side, per lot. On a 1-lot round-trip, cost = (0.2 pips × $10) + ($3.50 × 2) = $2 + $7 = $9.
In this hypothetical, Account B is cheaper by $3 per lot round-trip. But flip the commission to $6 per side and the maths inverts — Account A becomes cheaper. The label on the account doesn't tell you which is better. The arithmetic does.
How to Compare Two Accounts in One Number
The cleanest way to compare cost structures is to convert everything to a single all-in figure per standard lot, per round-trip, on the pair you actually trade most.
The formula is:
All-in cost = (typical spread in pips × pip value) + (commission per side × 2)
A few notes on doing this honestly:
- Use the typical spread during the hours you actually trade, not the marketing headline. A broker advertising "spreads from 0.0 pips" is telling you the best case, not the average.
- Pip value depends on the pair and the account currency. For EURUSD on a USD-denominated account, one pip on a standard lot is $10. For USDJPY it's roughly $6.70 to $7.50 depending on the JPY rate. For XAUUSD on most brokers, one "pip" (usually defined as 0.01) is $1 per micro-lot or $10 on a standard 100 oz contract — check your specification sheet.
- Round-trip means open and close. Some brokers quote commission per side, some per round-trip. Read carefully.
- Overnight positions add a third cost — the swap or financing charge — which is separate from spread and commission and matters more the longer you hold.
Once you have the all-in number for the two or three pairs you trade most, comparison becomes trivial. You are no longer comparing apples to oranges.
Where Cost Actually Bites
A 0.3-pip cost difference sounds negligible. Over a single trade, it is. Over a year of active trading, it isn't.
A trader placing 10 round-trips per day, 20 days a month, on 1-lot positions, is doing 2,400 round-trips a year. At $3 of cost difference per round-trip, that's $7,200 a year — before the strategy has to prove anything.
This is why scalpers and high-frequency systematic traders obsess over raw spreads and commission tiers, while a swing trader holding positions for days barely notices. The cost model that fits your style is the one where per-trade cost is a small fraction of your average expected move. If you're aiming for 15 pips per trade, a 1.5-pip all-in cost is 10% of your target. If you're aiming for 100 pips, the same 1.5 pips is 1.5%. Same cost, very different weight.
The Takeaway
Before you compare brokers, compare your own trading. Pull the last 50 trades you placed. Note the pairs, the average holding time, and the average size. Then apply the all-in formula to each account you're considering, using the typical spread during your actual trading hours.
The account that wins on a marketing page is rarely the account that wins on your blotter. The one that fits your specific pattern of behaviour usually is.
If you'd like to see our own spread and commission specifications applied to the pairs you trade most, our account comparison page lays out the numbers side by side.
For information only. This is market commentary and education, not investment advice. Figures are as at the time of writing.