Signature Debit

What signature debit is

Signature debit is a debit-card purchase routed through a card network, such as Visa or Mastercard, rather than a domestic PIN debit network. The money still comes from your customer's bank account. The term describes the transaction's route, not necessarily how the customer verifies the purchase.

The name is dated: networks stopped requiring signatures for chip-enabled purchases in October 2018. Customers can tap or insert a debit card without signing, while the transaction still follows the card-network route. Some merchants use “offline debit” as another name, but that does not mean the transaction was processed without authorization.

A debit card can take money from checking and still be priced on a card-network route.

How routing affects your costs

Signature debit follows the card network's interchange rules and also carries network fees and your processor's markup. PIN debit uses a domestic debit network. A 2024 Federal Reserve comparison cited in the research put average signature-based transaction costs at $0.37 and PIN-based costs at $0.25, a $0.12 difference. Those averages are not a quote for your business, and your actual costs depend on the transaction and pricing terms.

Regulation II requires at least two unaffiliated networks on each debit card, giving merchants a choice of routing for eligible transactions. As of 2026, debit issued by banks with at least $10 billion in assets is subject to an interchange cap of 21 cents plus 0.05% of the transaction, with a 1-cent fraud-prevention adjustment. The cap remains in force as of 2026; the Fed's proposed reduction was never finalized. Smaller issuers are not covered by that cap.

Where it appears on your statement

Look for debit interchange entries labeled with a network or card type, such as “Visa Debit,” “Mastercard Debit,” or “Regulated Debit.” The exact wording depends on your processor. On interchange-plus pricing, compare the debit category and pass-through amount with your markup. A bundled rate can hide whether a debit purchase was routed as signature or PIN debit.

What it means for your business

Routing changes the fee category, but authorization does not guarantee that you keep the funds. A customer can dispute a debit purchase, and an approved transaction can still become a chargeback. For in-person sales, an available PIN route can also give you an alternative to card-network routing, subject to the card and your setup.

What you can actually change

1. 01
   Compare debit routes. On your statement, compare signature-debit and PIN-debit interchange categories and total costs. Use the same period and transaction mix so the comparison is meaningful.
2. 02
   Review routing options. Ask your processor which eligible debit transactions can route over the card's other unaffiliated network. Confirm any routing setup or per-transaction charges before changing settings.
3. 03
   Check regulated pricing. Identify whether your debit transactions qualify for regulated interchange, then compare the pass-through amount with the as-of-2026 cap formula. Review processor markup separately, since the cap does not cap that markup.

Frequently asked questions