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Interchange Fee Waterfall — Where Your Card Payment Money Goes

A ₹1,000 card swipe doesn't arrive whole. Watch the split — merchant, issuing bank, card network, acquirer — and finally understand who earns what on every tap.

Ask ten people in fintech how a card payment's fees actually split and you'll get ten hand-waves. The split has a name — the MDR waterfall — and it decides everything from why your premium card earns better rewards to why your neighborhood store nudges you toward UPI.

The mechanics: the merchant pays a Merchant Discount Rate (MDR) on every card transaction. That MDR then flows downstream — the lion's share goes to the bank that issued your card (interchange), a thin slice goes to the card network (Visa, Mastercard, RuPay), and whatever remains is the acquirer's and payment aggregator's margin. Different card types carry very different economics, which is exactly why merchants feel them differently.

Pick a card type below, adjust any number — every default is editable and illustrative — and flip on comparison mode to see why a premium credit card and a debit card are entirely different animals to the person accepting them.

Show me the math

Disclaimer: rates are illustrative industry approximations. Actual MDR and interchange vary by network agreement, merchant size, category and regulation in force. Debit MDR is regulated; UPI P2M carries zero MDR.

FAQ

What is interchange?The fee the merchant's bank (acquirer) pays to the cardholder's bank (issuer) on every transaction — the largest slice of MDR. It funds rewards, credit risk and the issuer's economics. The issuer earns it because they take the credit risk and own the customer relationship.Who gets the MDR on a card payment?Three parties split it: the issuing bank takes the majority as interchange, the card network (Visa, Mastercard, RuPay) takes a small assessment fee, and the acquirer/payment aggregator keeps the remainder as their margin for serving the merchant.Why do premium cards cost merchants more?Premium cards carry higher interchange — that's what funds their richer rewards, lounges and benefits. Networks price interchange by card tier, so a premium swipe costs the merchant meaningfully more than a debit tap for the same amount. The rewards you enjoy are, quite literally, merchant-funded.Is MDR regulated in India?Partially. Debit card MDR is capped by regulation (lower for small merchants), UPI and RuPay-debit P2M carry zero MDR by mandate, and credit card MDR is market-determined — which is why credit MDR varies between roughly 1.5% and 3% depending on card type and merchant negotiation.What's the difference between MDR and interchange?MDR is what the merchant pays in total. Interchange is the portion of MDR that flows to the card issuer. Interchange is the wholesale cost inside the retail price — acquirers price MDR to merchants on top of the interchange they must pass through.

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Built by Shreyas Khare — payments & partnerships operator.