Payments · Guide · 6 min read
Interchange and scheme fees: what 'pass-through' really means
'Pass-through' means the acquirer bills interchange and scheme fees at cost, without its own margin. That can be true in the contract and still differ in what is applied, because these fees are hundreds of individual rates driven by transaction data.
- Who this is for
- CFOs, finance directors and payments leads at merchants with significant card volumes.
- Why it matters
- If interchange and scheme fees are treated as untouchable, nobody checks them. Yet they sit inside the cost of every card transaction you accept.
Executive summary
- 1Interchange and scheme fees are many rates, not one line item.
- 2Distinguish billing errors, avoidable cost and commercial benchmarking.
- 3Treat acquirer statements as data to audit, not bills to pay.
Is 'pass-through' actually at cost?
Contractually, often yes. In practice, interchange categories depend on card type, transaction type, merchant category code, authentication, data quality, geography and channel. Scheme fees add assessment, cross-border, network access, refund, chargeback and behavioural fees. What is applied depends on all of these.
What kinds of issue should finance teams look for?
| Type | What it is | How it is addressed |
|---|---|---|
| Billing errors | Charges that do not match contract or published rates, such as refunds billed at the wrong rate or duplicated fees | Reconciliation and recovery claims |
| Avoidable cost | Transactions landing in higher-cost categories because of data, authentication or classification issues | Operational and data fixes |
| Commercial benchmarking | Terms that are correctly applied but uncompetitive for your volume and sector | Renegotiation with evidence |
Interchange category mix
As card mix and authentication outcomes shift, transactions can settle into higher-rate categories than necessary. A changing blended rate is worth explaining, not assuming.
Cross-border classification
Cross-border status is determined by the card issuer, not where your customer or business sits. Classification errors can apply cross-border interchange and scheme fees to domestic transactions.
Scheme fee changes
Card schemes revise their fee schedules periodically. New or repriced fees can be absorbed into a blended figure without a usable explanation on the statement.
Why do finance teams miss it?
The data is fragmented and built for billing, not analysis. Interchange expertise is specialised. And an acquirer is obliged to bill interchange, not to optimise it.
What does good practice look like?
- Reconcile billed interchange and scheme fees against contracted and published rates regularly.
- Monitor interchange category distribution as a leading indicator of data or authentication issues.
- Check cross-border classification against issuer data rather than relying only on the acquirer's flag.
- Benchmark your total scheme fee burden against comparable merchants.
- Treat acquirer statements as data to be audited, not bills to be paid.
Sources and methodology
- Bankhawk methodology. Published card scheme fee schedules and acquirer billing files.
See what a payment-cost review would examine
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