What is an FX margin (exchange rate markup)?
An FX margin, also called an exchange rate markup, is the difference between the rate a provider gives you and the mid-market rate, usually shown as a percentage. It is a charge built into the rate rather than listed as a separate fee. Example (round numbers, not a live rate): at a mid-market rate of 1.25 dollars per pound, converting 80,000 pounds should give 100,000 dollars; a provider quoting 1.2375 pays 99,000 dollars, so the 1,000 dollar gap is a 1% margin.
- An FX margin is the percentage gap between the rate you are given and the mid-market rate at the same moment.
- Airwallex publishes 0.5% above interbank for major currencies and 1% for others; Mercury charges 1% on non-USD international wires.
- The US remittance rule that forces providers to disclose the exchange rate covers consumers only; transfers from business accounts are excluded.
- On a $200,000 conversion, each 0.25 percentage points of margin costs $500.
- Comparing quotes means comparing the amount that arrives, after margin and fixed fees.
How an FX margin works
A provider buys currency close to the wholesale price and sells it to you at a rate shifted in its favor. The shift is the margin. To measure it, take the mid-market rate at the time of your quote: margin equals the mid-market rate minus your rate, divided by the mid-market rate. Some providers publish the margin; others publish only that their rate is "competitive".
| Provider | Conversion pricing on its own page |
|---|---|
| Wise Business (US) | Fee varies by currency, from 0.23%; states it does not inflate the mid-market rate |
| Airwallex (US) | 0.5% above interbank rates for major currencies; 1% for all other currencies |
| WorldFirst (UK) | Up to 0.50% standard for major currencies; 0.30% for a new customer's first six months |
| Mercury | 1% currency exchange fee on non-USD international wires; 3% on non-USD card transactions |
| Helm | Agreed in writing before the account opens |
Sources: Wise, Airwallex, WorldFirst and Mercury pricing pages. Listed for comparison, not as a ranking. As published on 29 October 2026.
Where a business meets it
Margins sit inside every currency conversion: supplier payments, buyer receipts converted on arrival, card spending abroad and, on international wires, conversions made by a bank along the route. The US Consumer Financial Protection Bureau's official interpretation of Regulation E notes that an exchange rate set by an intermediary institution and applied to a transfer counts as the rate used.
Consumers sending money abroad get the exchange rate in writing before they pay, under 12 CFR 1005.31. Businesses do not: the rule applies only to a sender acting for personal, family or household purposes, and transfers from accounts held by corporations, LLCs, partnerships and sole proprietorships are not covered. A finance team has to ask for the rate itself.
| Amount converted | 0.25% margin | 0.50% margin | 1.00% margin | 3.00% margin |
|---|---|---|---|---|
| $20,000 | $50 | $100 | $200 | $600 |
| $200,000 | $500 | $1,000 | $2,000 | $6,000 |
| $2,000,000 | $5,000 | $10,000 | $20,000 | $60,000 |
Arithmetic example by the Helm Editorial Team. As published on 29 October 2026.
Common mistakes
- Comparing transfer fees only. A $0 fee with a 1% margin costs more than a $25 fee with a 0.25% margin on any amount above about $3,300.
- Letting incoming wires convert automatically. A single-currency account converts on arrival at the bank's rate; a currency balance lets you choose the time and the price.
- Forgetting the tier. Several providers cut the margin above monthly volume thresholds; ask which tier your volume reaches.
- Paying by card abroad. Card conversions can carry a higher rate than account conversions, as Mercury's 3% shows.
Related terms and how Helm handles it
The margin is measured against the mid-market rate. Bank charges along a wire route are separate; see intermediary bank fees. Holding a multi-currency account lets you convert only what you need.
Helm agrees pricing with each business in writing before the account opens, and shows the rate, the fee and the expected arrival before you confirm each payment.
Open a Helm account
USD, EUR and GBP accounts in your company's name, with a named account manager.
Open accountQuestions
What is a good FX margin for a business?
Published business rates on major currencies range from about 0.23% to 1% on the pricing pages compared above. Compare the amount that arrives for the same conversion at the same moment, including any fixed fee.
Do banks have to tell businesses their exchange rate markup?
Not under the US remittance rule. Its rate disclosure covers consumers sending money for personal purposes; transfers from business accounts are excluded, so a business should ask for the rate before confirming.
Is an FX margin the same as a fee?
It is a cost, but it is built into the rate instead of shown as a separate line. Some providers charge a stated conversion percentage instead, which works out the same way.
How can a business reduce FX margins?
Hold balances in the currencies you earn and spend, convert in larger and fewer batches, ask for volume tiers, and stop incoming wires from converting automatically on arrival. Compare the amount that arrives, not only the headline fee.
References
- Wise: Wise Business pricing (US)
- Airwallex: Pricing (US)
- WorldFirst: Business pricing (UK)
- Mercury: Pricing
- Consumer Financial Protection Bureau: Regulation E, 12 CFR 1005.30, remittance transfer definitions
- Consumer Financial Protection Bureau: Regulation E, 12 CFR 1005.31, disclosures
This guide is general information for businesses, not financial, legal or tax advice. Rules, fees and timings were checked against the sources listed on the review date and may change.