Debit Card
A payment card that deducts funds directly from the cardholder's checking or savings account at the time of purchase, rather than extending credit as credit cards do.
Debit cards allow consumers to make purchases using funds from their bank accounts without carrying cash or writing checks. When a debit card transaction is processed, the funds are immediately deducted from the linked bank account, unlike credit cards where the issuer extends credit that must be repaid later. Most debit cards carry Visa or Mastercard branding and can be used anywhere those networks are accepted, though they function fundamentally differently than credit cards.
Debit cards can be processed in two ways: PIN debit transactions require the cardholder to enter their Personal Identification Number at the point of sale and route through debit networks like STAR, NYCE, or Pulse rather than card networks. Signature debit transactions are processed like credit card transactions through Visa or Mastercard networks without requiring a PIN. The processing method significantly impacts merchant costs, with PIN debit typically costing less than signature debit.
For merchants, debit card acceptance is essential as debit cards account for approximately 30% of all card transactions in the United States. The Durbin Amendment, part of the Dodd-Frank Act, established regulated interchange rates for debit cards issued by banks with over $10 billion in assets, capping fees at $0.21 + 0.05% of the transaction value. These regulated debit rates are significantly lower than credit card interchange rates. However, debit cards from smaller institutions and prepaid cards remain unregulated and carry higher interchange rates. Merchants should ensure their systems are configured to properly identify and route debit transactions to receive the lowest applicable rates.
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3D Secure
An authentication protocol for online card transactions that adds an additional verification layer between the cardholder and issuing bank, shifting fraud liability from merchants to card issuers when properly implemented.
ACH Payment
Automated Clearing House payment is an electronic bank-to-bank payment method that transfers funds directly between bank accounts through the ACH network, typically used for direct deposits, bill payments, and recurring transactions.
Acquirer
A financial institution that processes credit card payments on behalf of merchants, maintains merchant accounts, and facilitates the settlement of funds from card-issuing banks to merchant bank accounts.
Address Verification Service (AVS)
A fraud prevention tool that compares the numeric portions of a billing address provided during a transaction against the address registered with the card-issuing bank, returning match result codes to help merchants assess transaction risk.
Aggregator
A payment service provider that enables multiple merchants to process card transactions under a single master merchant account rather than each merchant having their own dedicated merchant account, common with services like Square, Stripe, and PayPal.