Cards & Merchant Payments / Learning brief
Interchange, scheme fees, and the merchant discount
Your notes
In simple terms / 01
What this means in plain language
3% (consumer credit) bounding the interchange slice.
The merchant discount — the gap between what a merchant sells by card and what its acquirer pays out — is three fees stacked together. Interchange, usually the largest slice, is paid by the acquirer to the card issuer on every transaction; default rates are set by the scheme and, for consumer cards in scope of Regulation (EU) 2015/751, capped at 0.2% (debit) and 0.3% (credit). Scheme fees are what the network charges its member banks for routing, licensing, and settlement. The acquirer margin is what the merchant's own bank keeps for its service and risk — the only slice a merchant can negotiate directly. Under interchange-plus pricing the slices appear separately on the statement; under blended pricing they are averaged into one rate.
Key takeaways / 03
Three things to remember
- 01
Merchant discount = interchange (to the issuer) + scheme fees (to the network) + acquirer margin (to the acquirer).
- 02
Regulation (EU) 2015/751 caps consumer interchange at 0.2% debit and 0.3% credit; commercial cards and scheme fees sit outside those caps.
- 03
Merchants can negotiate the margin and the pricing model; interchange and scheme fees arrive as pass-through costs.
Practical use cases / 04
Where you would use this
Auditing an acquirer statement under interchange-plus pricing to check pass-through fees against the published rates.
Comparing acquirer offers: a low blended rate can hide the same interchange behind a different margin.
Assessing how a shift in card mix — debit versus credit, consumer versus commercial — changes acceptance cost under the caps.
Worked example / 05
Put the idea into a real situation
Illustrative example (SYNTHETIC / TRAINING ONLY): Demo Coffee Ltd sells EUR 100.00 in a day on EEA consumer debit cards. Interchange at the regulated cap of 0.2% is EUR 0.20, flowing through clearing to Bank Alfa and the other issuers. Cardnet — a fictional card network standing in for Visa- or Mastercard-style networks — charges an illustrative EUR 0.10 in scheme fees, and Meridian Bank, the acquirer, keeps an illustrative EUR 0.30 margin. Demo Coffee's payout is EUR 99.40 against a 0.6% merchant discount. Only the 0.2% line rests on a legal ceiling; the other two figures are teaching numbers that vary by contract.
Evidence & review / 07
Evidence & review
Four-party card schemes; the 0.2%/0.3% caps apply to consumer card transactions in scope of Regulation (EU) 2015/751, not to commercial cards or pure three-party schemes.
What this brief simplifies: Uses illustrative round numbers for scheme fees and acquirer margin, and treats the merchant discount as three clean slices; blended versus interchange-plus pricing detail and member-state options under the Regulation are only noted. The 0.2%/0.3% consumer interchange caps are quoted from Regulation (EU) 2015/751 as commonly cited; the regulation text could not be re-verified during this authoring pass (environment egress policy), so cap scope details beyond the consumer debit/credit split are deliberately not elaborated.
Sources for this brief2
- Simplified educational illustration
Payments Signal editorial teaching models — Payments Signal
Used wherever diagrams, scenarios, figures, or example values are didactic constructions rather than sourced facts; every such use carries a simplifications disclosure. All people, companies, banks, and list entries in examples are fictional.
- Market practiceMarch 2003 edition
A glossary of terms used in payments and settlement systems ↗ — CPSS (now CPMI), Bank for International Settlements
Terminology has evolved since this edition; newer CPMI publications refine some definitions.