Understanding FX costs:
where the hidden money
actually goes.

At any moment, every currency pair has a "mid-market rate" - the midpoint between the price at which the market is willing to buy and the price at which it is willing to sell. This is the rate you see on Google, XE.com, or in any financial news source.

This rate is real. It is the rate at which banks and institutional traders exchange currencies with each other in the interbank market. It is not, however, the rate any of them will offer you.

The "spread" is the gap between the mid-market rate and the rate you are actually offered. It is usually expressed as a percentage of the mid-market rate, but it is almost never shown to you as a percentage. Instead, it is silently embedded in the rate itself.

If the mid-market GBP/EUR rate is 1.1800, and your bank quotes you 1.1400 for a euro purchase, the spread is approximately 3.4%. You are effectively paying a 3.4% fee on the entire transaction - but since it appears as a rate, not a fee, it never shows on any receipt or statement.

Banks access the interbank market at rates within 0.1-0.3% of mid-market. They then add their own margin before offering a rate to retail customers. This margin varies by bank, transaction size, whether you are a personal or business customer, and which currencies are involved.

In most jurisdictions, banks are required to disclose explicit fees - transfer charges, processing fees, and so on. They are not required to present the exchange rate margin as a separate cost. So they don't. The rate is simply offered as "the rate", with no comparison to mid-market shown.

The markup varies by situation. Online transfers often get a slightly better rate than branch transfers. Business accounts often get marginally better rates than personal accounts. Less-traded currency pairs typically carry higher margins than major pairs like GBP/EUR or GBP/USD.

When a payment travels via SWIFT through multiple correspondent banks, each one may deduct a fee from the payment amount in transit. The recipient receives less than sent. This is known as a "SHA" (shared) cost arrangement, and it is the default on many international wires.

Many banks charge the recipient a fee for receiving an international transfer - typically between $10 and $25. If you are expecting a specific amount, this can mean the transfer falls short without any explanation from the sender's side.

Banks often delay the conversion of funds until after they have been received - sometimes days later. If rates move during this period, the conversion may happen at an unfavourable rate. Specialist brokers convert at the agreed rate immediately on trade execution.

A UK buyer is purchasing a property in Spain for €450,000. They ask their high street bank for a quote. The bank applies a 3.1% spread to the mid-market GBP/EUR rate of 1.1800, quoting 1.1434.

The difference between using a specialist broker and a high street bank on this transaction is £10,335. This is money that leaves the buyer's account, moves through the banking system, and is retained as profit by the bank. It never appears on any receipt as a "fee".

The practical answer is to use a specialist FX broker for any significant international payment. This is not a complex financial product - it is simply using a more transparent, more efficient provider for a standard money transfer.

When comparing providers, always ask for the exchange rate and compare it to the current mid-market rate (available on Google, XE.com, or Bloomberg). The difference between the two, as a percentage of the mid-market rate, is your true cost. Any provider unwilling to quote this clearly is relying on that opacity for their margin.