Forex Exchange: How It Works

Forex exchange, in everyday terms, means converting one currency into another: buying euros for a trip, paying an overseas invoice or receiving a salary from abroad. The same global currency market that traders talk about sets the underlying rates, but by the time a rate reaches you it usually includes a margin for the bank, bureau or payment firm doing the conversion. This lesson shows how to see that margin in numbers.

The rate on the news is not your rate

In the wholesale market, banks and dealers quote two prices for every pair: a bid and an ask. The mid-market rate is halfway between them. When you check the forex exchange today on a news site or search engine, the figure shown is usually close to this mid-market rate. It is a useful benchmark, but it is not a price retail customers are normally given.

Providers make money in two ways:

• a rate markup, giving you fewer units of the currency you are buying than the mid-market rate would; and
• a fixed fee or commission per transaction.

"Zero commission" usually means the whole cost has moved into the rate.

A worked forex exchange example

Illustrative only: you want to turn $1,000 into euros. The mid-market EUR/USD rate is 1.1650, meaning one euro costs $1.1650.

The markup alone costs €28.49, about 3.3% fewer euros than the benchmark. Adding the fixed fee takes the total shortfall to €32.64. The quickest test for any quote is to compare the amount you would receive with the amount at the mid-market rate.

Where conversions happen, and how costs differ

• Airport and tourist bureaux often have the widest margins, because customers have few alternatives at that moment.
• High-street banks may charge both a markup and a fee for international transfers, and receiving banks can add their own charges.
• Specialist transfer services often show the mid-market rate and a separate fee, which makes comparison easier.
• Cards used abroad are converted by the card network and your bank. Some cards add a foreign transaction fee; others do not.

Dynamic currency conversion

When paying by card abroad, a terminal or cash machine may offer to charge you in your home currency. This is called dynamic currency conversion, and the rate used is set by the merchant's provider, often with a larger markup than your own card would apply. Choosing to pay in the local currency usually avoids it.

Forex exchange for travel versus forex trading

When you change money for a holiday you own the currency outright and pay a one-off cost. Forex trading is different: traders usually hold leveraged positions on a price without ever receiving the currency, paying spreads and overnight financing instead. The mechanics are covered in our forex lesson, and the trading costs in trading fees explained. A rate markup of a few per cent would be unthinkable in trading, where spreads on major pairs are a small fraction of that, but it is common in retail conversions.

Sending money abroad: the route matters

International bank transfers often pass through one or more correspondent banks before reaching the recipient. Each can deduct a charge, so the amount that arrives may be lower than expected even if the rate was fair. When you send money, check whether the fee option says the sender pays all charges, the recipient pays them, or they are shared. Some transfer services use local accounts in each country instead, which can avoid intermediary deductions. Whichever route you use, the useful question remains the same: how much will actually arrive, in the recipient's currency?

What moves the rate

The underlying rate changes constantly on weekdays, driven by interest-rate expectations, economic data and global risk mood. For a one-off conversion, trying to time those moves is rarely worth the stress; the provider's markup is usually the bigger and more controllable cost. If you are converting a large amount, such as for a property purchase, some providers let you fix a rate in advance, which removes the uncertainty but can carry its own costs and conditions.

A quick checklist

1. Look up the mid-market rate just before you convert.
2. Ask each provider how many units of the foreign currency you will receive in total, after all fees.
3. Compare those totals, not the advertised rate or "no commission" claims.
4. Abroad, pay in the local currency when a card terminal asks.
5. For transfers, check whether the receiving bank adds a fee.

Keep receipts or statements showing the rate and fees for larger conversions. They make it easy to compare providers next time, and they help if a transfer arrives short and you need to ask where the money went.

Our pip calculator and markets overview explain how the wholesale market behind these rates works.