Also called: Check card, Debit
What a debit card is
A debit card lets a customer pay using money in a linked deposit account, usually a checking account. A credit card uses a line of credit. With debit, the issuing bank checks the account and approves or declines the purchase based on available funds and its authorization rules.
Your customer can tap, insert, swipe, enter card details online, or use a PIN, depending on the card and checkout. A debit purchase reduces the customer's available balance when authorized. The final account posting can follow later, and a temporary authorization hold can tie up funds before the final amount is settled.
A debit card draws on your customer's bank account, but your processing bill still depends on the route and markup.
How debit transactions work
The payment travels from your checkout through a card network or debit network to the card issuer. The issuer checks the account and returns an authorization decision. After you complete the sale and settle it, the funds move through the payment system to your business account.
A debit card carrying a major card-network brand can route over that network or an eligible debit network. Regulation II requires at least two unaffiliated networks on every debit card, giving merchants a routing choice. PIN entry and signature do not, by themselves, tell you which network handled a transaction.
Illustrative regulated debit interchange cap on a $50 sale
| Base amount | $0.21 |
|---|---|
| 0.05% of $50 | $0.025 |
| Fraud-prevention adjustment | $0.01 |
| Interchange cap total | $0.245 |
Illustrative calculation using the as-of-2026 cap for debit cards issued by banks with at least $10 billion in assets. It excludes network fees and processor markup.
What debit means for your costs
Your card-processing bill can include interchange paid to the issuing bank, network fees, and your processor's markup. Only the markup is negotiable. Debit interchange depends on the card and route, while your pricing plan determines how clearly you see each component. Flat-rate pricing can charge the same published rate for debit and credit even when the underlying interchange differs.
As of 2026, debit cards issued by banks with at least $10 billion in assets have an interchange cap of 21 cents plus 0.05% of the transaction and a 1-cent fraud-prevention adjustment. On an illustrative $50 purchase, that formula is 24.5 cents. It is an interchange cap, not a cap on your total processing charge. Cards from smaller banks are not covered by this cap.
Review itemized statements for debit interchange, network fees, and processor markup. Compare debit transactions by card-present or card-not-present type and by routing, then check whether the processor's markup changes between them. A high total debit cost does not prove interchange is high; the markup or other charges can be the source.
Debit cards and surcharges
You cannot add a surcharge to a debit or prepaid card, even when a customer selects a credit option at checkout. As of 2026, surcharging rules apply to credit cards only. Keep checkout and receipt settings from applying a credit-card surcharge to debit purchases.
What you can actually change
- Separate the costs. Use an itemized statement to distinguish interchange, network fees, and processor markup. Focus negotiation on the markup, since network fees and interchange are not processor markup.
- Review debit routing. Check whether your setup supports routing eligible debit transactions across the available unaffiliated networks. Compare costs by route and transaction type before changing routing settings.
Frequently asked questions
Is a debit card the same as a credit card?
No. A debit card draws from a linked bank account, while a credit card uses a line of credit. For your business, the transaction can also route differently and carry different interchange, even if both cards are accepted at the same terminal.
Can my business charge a fee for debit card payments?
You cannot apply a surcharge to debit or prepaid cards, including when a customer selects the credit option for a debit purchase. As of 2026, credit-card surcharges are subject to separate network and state rules.
What is the debit interchange cap?
As of 2026, the cap for debit cards issued by banks with at least $10 billion in assets is 21 cents plus 0.05% of the purchase and a 1-cent fraud-prevention adjustment. This limits interchange, not network fees or your processor's markup.
Can I route debit card transactions to a lower-cost network?
Regulation II requires at least two unaffiliated networks on every debit card, creating a routing choice for merchants. Check your payment setup and compare the cost of eligible routes before changing how transactions are sent.