Hidden Trading Costs to Know

Trading fees explained properly start with a distinction. Some costs are explicit: a commission, an account fee, a tax, printed on a statement. Others are implicit: built into the prices you receive, so you pay them without seeing a separate line. Implicit costs are the ones that surprise people, which is why this page treats them first.

The spread: paid on every trade

The spread is the gap between the buy (ask) and sell (bid) price. You buy at the higher price and sell at the lower, so a position starts slightly negative. On a pair quoted in dollars, the cost is the spread in pips multiplied by the pip value. Illustrative example: a 1.2-pip spread on one standard lot of EUR/USD costs $12. On a tenth of a lot of gold (10 ounces), a 30-cent spread costs $3; on a full 100-ounce lot, $30.

Spreads are not fixed. They widen when liquidity is thin, such as around the daily rollover, at the weekend open and during major data releases. A provider's "from" spread is the best case, not the typical one.

Commissions and platform charges

Some accounts charge a commission per lot in place of, or in addition to, a wider spread. A commission of $3.50 per lot per side, for example, adds $7 to a round trip. Share brokers may charge a flat fee per trade, a percentage, or nothing on trades while earning money in other ways. Investment platforms often charge an annual percentage of the value you hold, which matters far more to a long-term investor than the cost of any single trade.

Overnight financing: the cost of time

Leveraged positions held past the daily cut-off (17:00 New York time for forex) are charged or credited overnight financing, often called a swap or rollover. It reflects the interest-rate difference between the two currencies, plus a margin for the provider. Because spot forex settles two business days after the trade, the Wednesday rollover usually covers the weekend, so that night's charge is roughly three times the normal amount.

For a trade held a few hours, financing hardly matters. For a position held for months it can exceed every other cost combined, and it applies to the full size of the position, not just your margin. Check the financing rates before holding any leveraged position overnight.

Costs that hide in conversions and taxes

Currency conversion. If your account is in pounds and you buy US shares, the platform converts your money, often at a rate that includes a margin. Illustrative example: a 0.5% conversion charge on £5,000 costs £25, and you may pay it again when you sell and convert back.

Taxes on purchase. Some markets tax share purchases. In the UK, most purchases of UK shares carry 0.5% Stamp Duty Reserve Tax, so buying £4,000 of shares costs an extra £20.

Account fees. Look for inactivity fees, custody fees, charges for paper statements, data subscriptions and withdrawal fees. None is large on its own; together they can be.

Crypto costs. Crypto platforms combine a trading fee, a spread and, when you move coins, a network fee that varies with congestion. The crypto profit calculator includes fees on both the buy and the sell.

Putting the costs together

Here is one leveraged forex trade with every cost itemised. The figures are illustrative, not quotes from any provider.

Five rollovers, with Wednesday counting three times, add up to seven nights of financing: 7 × $6 = $42. Add the $10 spread and $7 commission and the total is $59. At $10 per pip, the trade needs to move about six pips in your favour before it breaks even.

A cost checklist before you trade

1. What is the typical spread at the time of day you would trade, not the minimum advertised?
2. Is there a commission, and is it charged on opening, closing or both?
3. What is the overnight financing rate for this instrument, in both directions?
4. Will your money be converted between currencies, and at what margin over the reference rate?
5. Are there taxes on purchase in this market?
6. Are there account, inactivity, data or withdrawal fees?

Write the answers down and add them up for a realistic holding period. The total is the hurdle your idea must clear before it makes anything.

Why small percentages matter over decades

For long-term investors the most important fee is often the smallest-looking one: an annual charge on the whole portfolio. Illustrative example: £10,000 growing at 5% a year for 20 years becomes about £26,533. At 4% a year, the result of a 1-point annual fee on the same underlying growth, it becomes about £21,911. The difference, about £4,622, is almost half of the original sum.

That is why comparing costs is worth an hour of your time before choosing any platform. Our checklist on how to choose a broker explains where to find a provider's full cost schedule, and the pip calculator converts spreads into money for any pair.

Sources

• HM Revenue and Customs, Stamp Duty Reserve Tax
• European Securities and Markets Authority, CFD disclosure requirements