Key takeaways
- Costs come in groups: transaction, holding and account costs. Your trading style decides which group dominates.
- A spread costs spread times pip value times lots; about 10 dollars per pip per standard lot on EUR/USD for a USD account.
- Convert commissions to pips and check whether they are quoted per side or per round turn before comparing.
- For positions held for weeks, swaps often cost more than the spread, so compare them first.
- Currency conversion markups are charged on the way in, on the way out and on foreign-currency trades.
- Ask for the written fee schedule and test the first withdrawal, where hidden costs show up.
Brokers rarely charge one fee. They earn from several small ones that arrive at different moments: when you open a trade, while you hold it, when you move money and sometimes just for having an account. Each is easy to underestimate alone, and together they decide whether a strategy that looks profitable on a chart is profitable in your account. This guide names every cost, shows how to calculate each with a worked example and ends with a monthly cost model you can adapt to your own trading.
The two moments you pay: entering and holding
Costs fall into three groups. Transaction costs are paid when you trade: the spread and any commission. Holding costs are paid for keeping a position open: overnight financing, called a swap or rollover, and on share accounts any margin interest. Account and movement costs are paid for the relationship with the broker: currency conversion, deposit and withdrawal fees, inactivity fees, platform and market-data fees. Grouping them helps because different trading styles are exposed to different groups.
| Group | Costs | When it is charged | Most exposed style |
|---|---|---|---|
| Transaction | Spread, commission | On each trade, entry and exit | Scalping, day trading |
| Holding | Swap or rollover, margin interest | Every night a position stays open | Swing and position trading |
| Account and movement | Conversion, deposit and withdrawal fees, inactivity, data and platform fees | On transfers, periodically or when idle | Small and occasional accounts, foreign-asset investors |
Spread: the price of immediacy
The spread is the difference between the price at which you can buy (the ask) and the price at which you can sell (the bid). If EUR/USD is quoted at 1.0848 bid and 1.0849 ask, the spread is one pip. You pay it because you buy at the higher price and, if you close immediately, sell at the lower one. A market maker or an aggregator of liquidity providers earns that difference. Spreads are not fixed: they widen when liquidity is thin, around news releases, at the daily rollover and in off-hours, and they are tighter on major pairs than on exotics.
Worked example: what a spread costs in money
The money cost of a spread is the spread in pips times the pip value times the position size in lots. For EUR/USD on a USD account one pip on one standard lot (100,000 units) is about 10 dollars. A spread of 0.8 pips therefore costs about 8 dollars per standard lot, 0.80 dollars per mini lot (0.1) and 0.08 dollars per micro lot (0.01). For pairs not quoted in your account currency the pip value changes with the exchange rate, so use a pip value calculator rather than assuming 10.
| Spread (pips) | Cost per 1.0 lot | Cost per 0.1 lot | Cost per 0.01 lot |
|---|---|---|---|
| 0.2 | $2.00 | $0.20 | $0.02 |
| 0.8 | $8.00 | $0.80 | $0.08 |
| 1.5 | $15.00 | $1.50 | $0.15 |
| 3.0 | $30.00 | $3.00 | $0.30 |
Commission: when the spread is not the whole price
Some accounts add a separate commission and offer a very tight, close-to-raw spread. Others build the broker's margin into a wider spread and charge no commission. Neither is cheaper in general: the all-in cost is the spread plus the commission converted into the same unit. To convert, divide the commission in money by the pip value. A commission of 7 dollars per round-turn standard lot is 0.7 pips when a pip is worth 10 dollars. Be careful with how it is quoted, because some brokers quote commission per side and others per round turn, which differs by a factor of two.
| Account model | Spread | Commission | All-in cost per standard lot |
|---|---|---|---|
| Spread-only (no commission) | 1.1 pips | none | 1.1 pips = $11.00 |
| Raw spread, commission per round turn | 0.2 pips | $7.00 | 0.2 + 0.7 = 0.9 pips = $9.00 |
| Raw spread, commission per side | 0.2 pips | $3.50 per side | 0.2 + 0.7 = 0.9 pips = $9.00 |
The second and third rows are the same price quoted in two ways, which is exactly why a headline commission figure needs its unit. On shares and ETFs the structure differs: a fixed fee per order, a percentage of trade value with a minimum, or both. For small orders the minimum charge matters most, since a 5 euro minimum on a 200 euro order is 2.5 percent before the spread.
Overnight financing: swaps and rollover
When you keep a leveraged position open past the daily cut-off, the broker rolls it forward and charges or pays a financing amount. In forex it reflects the interest-rate difference between the two currencies in the pair plus a broker markup. Holding the higher-yielding currency long can earn a positive swap before the markup; holding the lower-yielding currency long usually costs. In practice the broker's markup often makes both directions less favourable than the pure rate difference. Swaps are usually applied each night, with three nights' worth charged on one weekday, commonly Wednesday for spot forex, to account for the weekend.
Worked example: holding for two weeks
Suppose a long position of one standard lot has a swap of minus 6 dollars per night. Holding it for 14 nights costs about 84 dollars plus the extra days around the triple-swap day, easily more than the 8 dollars the spread cost to open the trade. For a trader who holds for weeks, the swap is the dominant cost and should be compared across brokers before the spread. Contracts for difference on shares and indices charge financing on the full position value, usually a benchmark rate plus an annual markup, which accrues daily.
Currency conversion: the fee that hides inside the rate
Whenever the currency you fund, trade or withdraw in differs from your account currency, conversion happens, and the broker or payment provider applies its own rate. A markup of 0.5 percent looks small until you notice it applies on the way in, on the way out and on every foreign-currency trade in between. Investors who buy shares in other currencies are most exposed. The practical fix is to hold sub-accounts in the currencies you trade where available, to fund in your account's base currency and to compare the conversion rate with the mid-market rate on the day.
| Markup over mid-market rate | Cost on a 5,000 deposit | Cost of a deposit and a withdrawal |
|---|---|---|
| 0.1% | 5.00 | 10.00 |
| 0.5% | 25.00 | 50.00 |
| 1.0% | 50.00 | 100.00 |
| 2.0% | 100.00 | 200.00 |
Funding, withdrawals and account fees
Many brokers advertise free deposits but charge for withdrawals by some methods, apply a fixed fee to bank wires and pass on intermediary or correspondent bank charges that they do not control. Card deposits can be free for you yet be refunded back to the card, with restrictions on withdrawing profit elsewhere. Beyond funding, check four recurring items: inactivity fees charged after a quiet period, account maintenance or custody fees, platform or data subscriptions, and charges for paper statements or specific services.
- Ask for the written fee schedule, not the marketing page, and note the date on it.
- Check whether the first withdrawal in a month is free and what the minimum withdrawal amount is.
- Find the inactivity rule: after how long, how much and whether it can be waived by trading.
- For share accounts, check custody, dividend handling and any fee for foreign market data.
- Ask whether a VPS, signals or an advanced charting package is sold separately.
A monthly cost model for three trader profiles
The right way to compare is to model a month of your own activity. The three profiles below are illustrative: they use round numbers to show how the cost mix changes with style, not to describe any broker. Use them as a template and replace the inputs with your own.
| Item | Scalper | Swing trader | Long-term investor |
|---|---|---|---|
| Trades per month | 200 round trips | 12 round trips | 2 purchases |
| Average size | 0.5 lot | 0.5 lot | 1,000 in a share ETF |
| Cost per round trip (spread plus commission) | $5.00 per 0.5 lot | $6.00 per 0.5 lot | $2.00 commission plus spread |
| Transaction costs | $1,000 | $72 | $4 |
| Nights held at $3 per night per 0.5 lot | about 40 nights in total | about 150 nights in total | not applicable |
| Financing | $120 | $450 | $0 |
| Conversion and funding | $20 | $20 | $10 (foreign ETF) |
| Monthly total | about $1,140 | about $542 | about $14 |
| Dominant cost | Spread and commission | Swaps | Conversion and account fees |
Computed from the table above. The mix, not the totals, is the lesson: each style is exposed to a different cost.
How to audit your own costs in an afternoon
- Export your last three months of statements. Most platforms let you download a trade history with spread, commission and swap per trade.Tip: If the statement does not itemise costs, that is information about the broker.
- Sum each cost type separately. Transaction, financing, conversion and account fees give four numbers.
- Express costs as a share of your results. A cost that is a tenth of your profit is a nuisance; one that is the same size is the strategy.
- Find the biggest cost and compare it with two alternatives. Rank brokers by that cost on your own volumes, not by the headline.
- Set an alert for changes. Fee schedules change. Re-check at least once a year.
Frequently asked questions
Is zero commission really free?
It means no separate commission line. The broker still earns from the spread, financing, conversion or order-routing arrangements, so compare the all-in cost.
Why does my broker show a wider spread than advertised?
Advertised spreads are usually best-case or averages in calm conditions. Spreads widen in news, at rollover and when liquidity is thin. Measure the average over the hours you trade.
What is a triple swap?
A charge equal to three nights of financing applied on one weekday, commonly Wednesday for spot forex, to cover the weekend. It means a position held across that day costs more.
Do swap rates change?
Yes. They follow interest rates and the broker's markup, and brokers can change them. Check the current swap table for your instrument and direction.
Are swap-free accounts free of financing?
Not always. Some brokers replace swaps with an administration fee or a wider spread. Ask for the exact terms in writing.
How do I reduce conversion costs?
Fund in your account's base currency, use sub-accounts in currencies you trade where available and compare the broker's rate with the mid-market rate.
What costs apply to buying shares and ETFs?
Commission or a per-order fee, spread or market impact, currency conversion for foreign shares, custody or account fees and possible taxes. The fund also has its own annual cost, shown as an expense ratio.
Does a lower cost mean a better broker?
Not by itself. A cheap broker with weak protection, poor execution or slow withdrawals can cost more in practice. Use cost as one criterion after safety and availability.