How exchange-rate markups hide the real cost of sending money abroad

Most money transfer services advertise their fee. Fewer advertise the other half of their price: the margin built into the exchange rate. Measuring it takes one extra number, the mid-market rate, and the method works for any transfer, card payment or bank conversion.

Two parts of every price

Every international transfer has two possible charges:

1. A transfer fee, usually a fixed amount, a percentage, or both. It is stated on the quote.
2. An exchange-rate margin, the difference between the rate the provider gives you and the rate currencies trade at. It is rarely stated as a cost.

A provider can earn from either or both. Western Union says it "also makes money from currency exchange", and advises customers to "carefully compare both transfer fees and exchange rates." Wise says it uses "the live mid-market rate" with "a small, upfront fee".

The benchmark: the mid-market rate

The mid-market rate is the midpoint between the rates at which a currency is being bought and sold on the wholesale market. It is the fairest single reference, because it favours neither side. Any rate worse than it, from the sender's point of view, contains a margin.

Two practical points:

• Check it at the same moment as the quote. Rates move continuously while markets are open, so a mid-market rate from the morning cannot test an afternoon quote.
• Use the same direction. A rate quoted as pesos per dollar and one quoted as dollars per peso need converting before they can be compared.

The arithmetic

• Markup % = (mid-market rate − your rate) ÷ mid-market rate
• Markup cost = amount converted × markup %
• True cost = transfer fee + markup cost

US example: $500 to Mexico (illustrative numbers)

• Fee: $4.99, leaving $495.01 to convert
• Mid-market: 18.50 pesos per dollar; quoted: 18.10
• Markup: 0.40 ÷ 18.50 ≈ 2.16%
• Markup cost: $495.01 × 2.16% ≈ $10.70
• True cost ≈ $15.69, or 3.1% of $500

UK example: £500 to India (illustrative numbers)

• Fee: £2.99, leaving £497.01 to convert
• Mid-market: 110.0 rupees per pound; quoted: 108.5
• Markup: 1.5 ÷ 110 ≈ 1.36%
• Markup cost: £497.01 × 1.36% ≈ £6.78
• True cost ≈ £9.77, or 2.0% of £500

These are example numbers, not quotes. The true-cost calculator uses them as defaults so they can be replaced with real ones.

Working backwards from what the recipient gets

When a quote shows only the amount the recipient will receive, the true cost can be found without knowing how it splits between fee and margin:

1. Multiply the amount paid by the mid-market rate. That is what would arrive with no fee and no margin.
2. Subtract what the recipient actually gets.
3. Divide the difference by the mid-market rate to turn it back into the sending currency.

In the US example, $500 at 18.50 would be 9,250 pesos. The quote delivers about 8,960. The gap of 290 pesos, divided by 18.50, is $15.68, the same true cost as before. This check works on any quote, whatever the provider calls its charges.

How fees and margins scale

A fixed fee costs the same on every transfer, so it weighs most on small amounts. A margin is a percentage, so it weighs most on large ones. Three illustrative pricing models:

The models are invented to show the pattern, not taken from any provider. The cheapest provider for $200 is not always the cheapest for $5,000, which is why quotes are best compared at the amount actually being sent. Some providers also lower their fees above a threshold: Wise lists a discount on transfers above 25,000 USD or 20,000 GBP.

What US providers must disclose

The CFPB's remittance rule requires a provider to show, before payment, the transfer amount, fees and taxes, the total, the exchange rate and the "Total to Recipient" (12 CFR 1005.31). After paying, the sender can cancel within 30 minutes, and the refund is due within three business days (12 CFR 1005.34). Those disclosures contain every number the true-cost calculation needs.

In the UK

Under the Payment Services Regulations 2017, a provider's framework contract must set out "details of the interest and exchange rates to be applied" or, where a reference exchange rate is used, how the actual rate is calculated (Schedule 4). In practice, UK transfer apps show the rate and the amount to arrive on the quote screen, and the same mid-market check applies.

Markups outside transfer apps

The same arithmetic applies wherever one currency becomes another.

• Cards abroad. Some accounts charge a foreign transaction fee on top of the network's rate. On our US comparison, Current charges 3%, Ally up to 1%, and Capital One 360 none.
• Business cards. UK expense platforms publish FX fees from mid-market plus 0.3% at Payhawk to 2.00% on Pleo's Start plan; see our guide to expense card types.
• Paying in your home currency abroad. When a card terminal or cash machine abroad offers to charge in the home currency, the conversion is done at a rate set by the merchant's provider. The mid-market check shows what that choice costs.
• Bank transfers. Banks may convert at their own rate and add a fixed fee, and intermediary banks can deduct charges before the money arrives.

The payment method and delivery

The way a transfer is paid for and delivered can change the price. Western Union notes that paying by credit card may add a cash-advance fee from the card issuer, and WorldRemit says debit cards are cheaper than credit cards. Delivery to a bank account, cash pickup and mobile wallets are often priced differently, so the comparison is fairest with the same payment and delivery method on each quote.

A checklist for comparing transfers

1. Get quotes for the same amount, payment method and delivery method.
2. Take them within a few minutes of each other, and note the mid-market rate at the same time.
3. Compare the amount the recipient gets, or work out the true cost for each.
4. Check for card or intermediary fees that the quote may not include.
5. For regular transfers, repeat the check occasionally; margins and fees change.

Comparing providers

Our US and UK comparisons describe how each provider prices and discloses its rates. They are deliberately not ranked on cost, because prices are live quotes that change by corridor and by the minute.