Auditing Your EOR Invoices for Hidden Fees and FX Markup

When your EOR converts your home currency payment into the employee's local currency, compare the rate they actually used against a public benchmark rate for that same day, a central bank rate or a major FX data provider's rate. A small, consistent spread is normal and covers the provider's own costs; a large or inconsistent spread is worth a direct conversation.

Do this for a full quarter across your different payroll countries, not a single spot check, since the spread can vary by currency pair and some providers apply a wider markup on less commonly traded currencies specifically.

Go through a recent invoice line by line and get a plain-language explanation for anything that isn't obviously payroll, tax, or the provider's stated management fee. Administrative fees, compliance fees, and onboarding fees sometimes appear as recurring charges rather than one-time ones, which is worth catching specifically since a one-time fee that became recurring is easy to miss without a direct comparison across months.

Ask for this explanation in writing, since a vague verbal answer from a support rep isn't something you can act on later if the pattern continues.

Pull the original sales proposal or rate card you were quoted before signing, and compare it directly against what you're actually being invoiced now. Fee creep often happens gradually, a new charge introduced quietly in a platform update, a rate that shifted after an initial promotional period ended, rather than as a single obvious change you'd notice.

If you find a discrepancy, raise it directly and ask for either a correction or a clear explanation of when and why the terms changed, since a provider that can't explain the gap has a real problem, not just a communication issue.

For example, suppose your original proposal listed a single monthly management fee per employee, and a recent invoice shows that fee plus an administrative charge and a payment processing charge. Put the proposal, the contract and the last few invoices side by side in a simple table, mark each line as present, new or changed, and ask the provider to point to the contract clause or notice that authorized every new line. Anything they can't source becomes a documented question rather than a vague suspicion.

A few patterns that warrant escalating beyond a routine invoice review:

• An FX spread that's meaningfully wider than public benchmark rates, especially if it's inconsistent month to month
• A fee that appears on the invoice but was never mentioned in the original proposal or contract
• Resistance or vagueness when you ask directly for a line-item breakdown of what a fee actually covers
• A rate that increased without the notice period specified in your contract

Any of these is worth raising directly with your account manager, and escalating to contract review if the explanation isn't satisfactory.

A single invoice audit catches what's happening now, but fee structures and FX spreads can drift over time, so build a quarterly review into your standard finance calendar rather than treating this as a one-time exercise. A compliance platform like Vanta or Drata isn't built for vendor invoice auditing specifically, but it's useful for the surrounding discipline: documenting that a vendor review process exists and runs on schedule, the same pattern that helps with any recurring vendor oversight.

Track each line item's dollar value across quarters in a simple running log so a slow drift shows up as a trend, not just a one-off number nobody has anything to compare it against.