How To Find The FX Markup In Your Exchange Rate

Your statement shows the converted amount, not what the conversion cost. Here's how to measure it.

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Most finance teams know their processing rate to the basis point. Far fewer know what currency conversion costs them.

Some providers show conversion as a separate fee. Others build it into the exchange rate, so your statement shows a converted amount and nothing about what the conversion cost. Either way, the only reliable way to know your number is to measure it.

Here's how to do that in four steps, using data you already have.

Where FX Cost Shows Up

On the pay-in side, it happens when customer payments in one currency settle into your bank account in another. On the payout side, it happens when you fund payouts in one currency and your beneficiaries get paid in another. If you do both, you pay it on both legs, and each one needs its own check. We covered the payout side in more detail in Your Payout Rate Isn't Your Payout Cost.

This is separate from dynamic currency conversion, where your customer is offered their home currency at checkout. That markup lands on your customer, not on you. We broke it down in A Commission For You. A Markup For Them.

Step 1: Pull One Real Conversion

Take a recent settlement where customer payments were converted into your home currency, or a payout batch you funded in one currency and paid out in another. You need three things: the amount before conversion, the amount after, and when it converted.

Start with the corridor you convert most. That's where the money is, and once you've done one, the rest go faster.

Step 2: Find The Mid-Market Rate At That Moment

The mid-market rate is the midpoint between wholesale buy and sell prices for a currency pair. It's the rate with no margin built in, which makes it the benchmark to measure against.

Timing matters. Rates move throughout the day, so match the reference rate to the time your conversion happened. A daily average or a closing rate can make the gap look bigger or smaller than it really is. If your statement only gives a date, treat a single result as rough and look for a consistent gap across several conversions.

Pick one reference source and use it every time, so your checks compare against each other.

Step 3: Do The Math

Multiply the amount before conversion by the mid-market rate. That's what you would have received with no FX cost at all. Subtract what you actually received. The difference is your total FX cost on that conversion.

Then take out any conversion fee your statement shows as its own line. What's left was built into the rate.

Example: €100,000 of sales settles into USD. At a mid-market rate of 1.0800, that's $108,000. You received $106,920. Your FX cost is $1,080, or 1.0% of the converted amount. (Illustrative figures, not a real quote.)

Now apply that percentage to a year of volume in the corridor. At $5 million converted, a 1.0% cost is $50,000 a year. That's the number to put in front of your CFO, and the number to bring to your provider.

Step 4: Put The Rate In Writing

Ask your provider to state its FX markup in basis points over a named reference rate, by corridor, in your contract. "Competitive rates" isn't a number. A markup over a named benchmark is, and you can check it.

If the gap turns out to be real, you have options.

Negotiate it. With the number by corridor in hand, you're negotiating from data, not from a general sense that FX is expensive.

Settle in the currency you collect. Some providers can settle into bank accounts in additional currencies, so you hold the funds and decide when to convert. Availability depends on the provider and the country you operate from.

Convert on your own terms. Dedicated FX providers often price conversion separately and more transparently. It adds a step, but it separates the processing decision from the FX decision.

Then re-run the check every quarter. Markups can change with provider pricing and market conditions, and a check from last year won't catch that.

The Takeaway

Most companies negotiate the processing fee hard and never look at the rate. FX cost shows up on both sides of the business, when sales settle and when you pay people abroad, and it often isn't a line item. Measure it by corridor, get the markup in writing, and check it again next quarter.

If cross-border fees are part of the same conversation, see Set Up A Local Entity Or Endure Cross-Border Fees?