Benchmark data
Use published provider ranges as context — then validate on your corridors.
For CFOs
Audit your bank's FX markup before you approve the next payment.
Your bank may show “no fee” on international payments while earning margin inside the rate. This guide shows finance teams how to make that margin visible before the next approval.
Built for businesses with £1M+ equivalent annual FX exposure and recurring international supplier, customer, or treasury payment flows.
Most businesses never calculate effective FX spread on business payments. The ones that do usually find the cost is larger than expected — because it never appears as a named fee on the statement.
This is an internal audit method for finance teams. It is not a promise about future pricing from any provider.
The workflow
Four-step bank FX audit
01Pull recent payment confirmationsCollect 12–16 international payments with execution timestamp, currency pair, applied rate, debit amount, and credited amount where shown.
02Record interbank reference at executionMatch each payment to a market reference at the same date and time window. Stay consistent across the sample.
03Calculate spread per paymentSpread (%) = ((interbank reference − applied) ÷ interbank reference) × 100, adjusted for pair direction as needed. Note outliers by corridor.
04Extrapolate annual economicsMultiply average spread by annual FX volume. Add visible fees, estimated deductions, and internal reconciliation time.
Worked example (illustrative)
£50,000 GBP→USD. Interbank reference 1.2650. Applied 1.2350. Spread ≈ 2.37% → about £1,185 of margin embedded in the rate, with no separate FX fee line on the statement.
FX audit checklist
- ✓Payment confirmations with rate and timestamp
- ✓Consistent interbank reference source for the sample
- ✓Spread % per payment and by corridor
- ✓Average spread × annual FX volume
- ✓Visible wire or platform fees
- ✓Beneficiary short-receipt or deduction cases
- ✓Internal hours matching invoices, FX, and payout
- ✓Comparison of total economics vs alternative models
Do not stop at “lower fee”
Weak comparison
- Quoted online rate
- Marketing comparison tables
- Single sample without timestamp
- Ignoring deductions
Serious CFO comparison
- Executable rate at payment size
- Final received amount
- Route and beneficiary-bank handling
- Payment proof and references
- Reconciliation effort
- Support ownership on exceptions
Next reads for finance teams
Pricing and FX operations
Connect audit results to how your business actually pays suppliers.
Provider comparisons
Compare operating fit, not only headline rate.
Working capital timing
Spread is only part of total treasury cost.
FAQ
Where is bank FX markup hidden?
It is usually embedded in the exchange rate on the payment confirmation rather than shown as a separate fee. Finance must compare the applied rate to a market reference at execution time.
What reference rate should I use?
Use a reputable interbank reference or interbank reference for the payment timestamp. Be consistent across all payments in the audit sample.
Should I compare only the spread percentage?
No. Also review transfer fees, route deductions, final received amount, reconciliation effort, and payment timing impact on operations.
How do I use the result internally?
Build an annual FX economics view finance can defend: average spread, worst corridors, and total cost including operational friction — then compare provider models on that basis.