One-Line Definition
The interchange fee is the wholesale rate that a merchant's acquiring bank pays to a cardholder's issuing bank every time a customer pays with a credit or debit card — it is the single largest component of the total fee a merchant absorbs for accepting cards.
Real-Life Analogy
Think of a credit card payment as an international wire transfer between two banks that don't trust each other and have never met.
The issuing bank (Chase, HSBC, Citi) is the one that handed your customer the plastic, approved the transaction, and carries the risk that the customer never pays. The acquiring bank (Stripe's bank, Adyen's bank, Worldpay) is the one that signed the merchant and has to guarantee the money actually lands in the merchant's account.
The interchange fee is the wholesale settlement between them — it compensates the issuing bank for extending credit, absorbing fraud losses, funding rewards programs, and running the authorization network. The merchant never sees this fee on a line item, but it is baked into the 2–3% "card processing fee" they pay on every sale. It's the wholesale price of money movement, and the acquirer marks it up before passing the bill downstream.
Core Formula
The interchange fee is almost always expressed as a percentage of the transaction plus a fixed per-transaction amount:
Interchange Fee = (Transaction Amount × Interchange Rate %) + Fixed Fee
And at the merchant level:
Total Card Processing Cost =
Interchange Fee
+ Assessment Fee (paid to Visa/Mastercard/Amex)
+ Acquirer Markup (paid to the PSP/acquirer)
+ Gateway / PCI / Monthly Fees
Worked example (US card-present, standard rewards credit card):
- Transaction: $200
- Interchange rate: 1.80% + $0.10
- Interchange fee = ($200 × 0.018) + $0.10 = $3.70
- Assessment fee (Visa/MC, ~0.14%) = $0.28
- Acquirer markup (0.30% + $0.05) = $0.65
- Total merchant cost ≈ $4.63 (2.32%)
The interchange portion — $3.70 — is roughly 80% of the total fee, which is why interchange is called the dominant cost of card acceptance.
Comparison with Related Terms
| Term | Paid By | Paid To | Typical Range (US) | What It Covers |
|---|---|---|---|---|
| **Interchange Fee** | Acquiring bank | Issuing bank | 0.05% – 3.15% + $0.10–$0.30 | Credit risk, fraud, rewards, network cost |
| **Assessment Fee** | Acquiring bank | Card network (Visa/MC) | 0.11% – 0.15% | Brand licensing, network infrastructure |
| **Acquirer Markup / PSP Fee** | Merchant | Acquirer / Stripe / Adyen | 0.20% – 1.00% + $0.10 | Underwriting, support, settlement, margin |
| **Merchant Discount Rate (MDR)** | Merchant | Acquiring bank | 1.5% – 3.5% all-in | The blended total of all the above |
| **Scheme Fee** | Acquirer | Card network | Varies by region | Cross-border, authorization, tokenization |
The key distinction: interchange is a cost between banks; MDR is the cost the merchant actually pays. Merchants negotiate their MDR, but interchange itself is set by the card networks and is largely non-negotiable for small and mid-size merchants.
Use Cases
1. Pricing a cross-border DTC store.
A merchant selling into the EU from the US pays higher interchange on cross-border transactions — often 0.30–0.60% more than domestic — plus a scheme fee for the international leg. On a $200 order, that can add $0.60–$1.20 before the acquirer's markup even applies. This is why DTC brands localize acquiring entities: routing through a local acquirer converts a cross-border interchange into a domestic one.
2. Choosing between card-present and card-not-present.
Card-not-present (CNP) e-commerce interchange runs roughly 0.30–0.50% higher than card-present because fraud risk is higher. A $500 online order at 2.30% interchange costs $11.50, versus ~$9.00 for the same sale at a physical terminal.
3. Rewards card economics.
Premium travel cards (Amex Platinum, Chase Sapphire Reserve) can carry interchange of 2.30%–3.15%, versus 1.50%–1.80% for a basic debit or standard credit card. If 40% of a merchant's customers use premium rewards cards, their blended interchange jumps by roughly 0.30–0.50 percentage points — on $1M in revenue, that's $3,000–$5,000 in additional annual cost with zero change in sales.
4. Interchange++ pricing.
Sophisticated merchants (typically $10M+ volume) negotiate interchange++ pricing, where the acquirer passes through the exact interchange and assessment fees and charges a fixed markup. This is more transparent than flat-rate pricing but requires the merchant to have the volume and data to audit the pass-through.
Misconceptions
"Interchange fees go to Visa and Mastercard."
False. Interchange goes to the issuing bank — the customer's bank. Visa and Mastercard set the *rates* but do not collect the interchange itself; they collect the separate assessment fee.
"If I negotiate a lower rate with Stripe, my interchange goes down."
No. Stripe and other PSPs can only discount their own markup. The interchange and assessment portions are pass-through costs set by the networks. A merchant can lower interchange only by changing *how* transactions are processed (local acquiring, lower-risk card mix, Level 2/3 data on B2B transactions).
"Interchange is the same worldwide."
Interchange is heavily regulated by region. The EU caps consumer credit interchange at 0.30% and debit at 0.20%. The US has no such cap, which is why US interchange is 5–10x higher than EU rates. Australia, Brazil, and Canada have their own caps or negotiated limits. A cross-border merchant's effective cost depends enormously on where the issuing bank sits.
"Debit and credit cost the same."
Debit interchange is typically far lower — often 0.05%–0.50% in the US, and capped at 0.20% in the EU. A merchant whose customers predominantly use debit pays dramatically less than one serving premium credit cardholders.
"Interchange is a hidden fee."
It's not hidden — it's disclosed in network rate tables and required to be passed through transparently under interchange++ pricing. What *is* hidden from most merchants is the exact card mix and the resulting blended rate, which is why fee audits regularly find 10–20% overcharges.
Related Terms
- Assessment Fee — network fee paid to Visa/Mastercard, separate from interchange
- Merchant Discount Rate (MDR) — the all-in rate a merchant pays
- Interchange++ — transparent pricing model passing through interchange and assessments
- Issuing Bank — the cardholder's bank, recipient of the interchange fee
- Acquiring Bank — the merchant's bank, payer of the interchange fee
- Card-Not-Present (CNP) — higher-risk e-commerce transactions with elevated interchange
- Scheme Fee — additional network charges, especially on cross-border volume
- Level 2 / Level 3 Data — enhanced transaction data that can qualify B2B payments for lower interchange
- Durbin Amendment — US regulation capping debit interchange for large banks
- PSD2 / Interchange Fee Regulation (IFR) — EU rules capping consumer card interchange