BIN NumberBank Identification Number — Definition & Guide
BIN Number — Definition & Guide
A BIN number (Bank Identification Number) is the first 6–8 digits of a payment card that identify the issuing bank, card network, card type (credit, debit, or prepaid), and card tier. BIN data travels with every transaction and directly determines which interchange rate applies. The Federal Reserve’s interchange fee data reflects how card type — identified through the BIN — affects the cost of every card transaction in the U.S.
When a card is swiped, dipped, or tapped, the processor reads the BIN number and instantly knows: which bank issued it, which network it runs on, whether it is a consumer credit, debit, prepaid, or commercial card, and which tier it falls into. All of this determines the interchange rate for that specific transaction.
A Chase Sapphire Reserve card has a higher interchange rate than a basic Visa debit card — and the card BIN definition is what tells the system which is which. Same terminal, same transaction amount, different card, different cost to the merchant. This is one reason interchange-plus pricing is more transparent than flat-rate — you see exactly what each card type costs rather than paying a blended rate that hides card-type variation. See how this plays out across business types on the compare pricing models page.
The bank identification number lookup process happens in milliseconds during every card transaction:
Merchants do not see the BIN lookup — only the result. But these first digits are why identical transactions can cost different amounts depending on which card the customer uses. On an interchange-plus statement, each card category appears as a separate line — making BIN-driven cost differences visible and verifiable. The CFPB’s card payment guidance provides additional context on how card type classification affects merchants and consumers.
BIN stands for Bank Identification Number. It is also referred to as an IIN (Issuer Identification Number) in updated industry standards — the terms are used interchangeably in payment processing.
Traditionally 6 digits, but the standard was updated to support 8-digit BINs to accommodate the growing number of card issuers globally. Most modern processors and terminals support both 6- and 8-digit BIN lookup merchant systems.
The bank identification number determines whether a card is a rewards card, commercial card, or debit card — each carries a different interchange rate. A high proportion of premium rewards cards in your transaction mix increases your average interchange cost. This is most visible on an interchange-plus statement, where each card category is priced separately.
BIN-Level Routing Decisions Affect What You Pay. The Statement Shows Where Your Volume Lands.
Send us your last processing statement. We will calculate your share of rewards, commercial, and standard consumer cards by BIN, identify any routing inefficiencies, and show you what a fair effective rate looks like at your volume.
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