Debit Card Routing and Regulated Debit: Are You Getting the Cheap Rate?
Debit Card Routing and Regulated Debit: Are You Getting the Cheap Rate?
Debit cards from large issuers carry interchange capped at about $0.22 plus 0.05%, which is 0.63% on a $38 ticket and 0.23% on $120, a fraction of what credit costs. On $1.2 million of debit volume, a merchant on flat-rate pricing pays $17,648 a year more than one whose pricing passes the cap through, and never sees the difference. Routing the exempt cards to the cheaper network is worth another $2,023.
What you'll learn
Debit is the cheapest card there is, for some merchants
A debit card and a credit card look identical at the terminal and cost very different amounts to accept. The reason is a rule: debit cards issued by banks above an asset threshold carry interchange capped by regulation, and the cap is low. Under the current rule the cap is roughly $0.21 plus 0.05% of the transaction, with a small fraud-prevention adjustment, so about $0.22 plus 0.05%. Cards from smaller, exempt issuers carry ordinary interchange, commonly above 1% plus a fixed fee.
The cap is a fixed amount plus a tiny percentage, which makes its effective rate depend heavily on ticket size.
| Average ticket | Regulated debit effective rate |
|---|---|
| $12 | 1.88% |
| $38 | 0.63% |
| $120 | 0.23% |
At a $120 ticket, regulated debit costs about a tenth of a typical credit card. At a $12 ticket, the fixed component dominates and the advantage mostly disappears. Per our interchange analysis, the cap exists because debit was judged not to need the incentive structure that credit interchange funds, and the arithmetic above is the consequence.
The cap has been the subject of a proposed reduction and of litigation, and the figure in force may change. Confirm the current number with your processor; the structure of the argument does not depend on it.
Whether you are getting the cheap rate
Take a merchant with $1,200,000 of annual debit volume at a $38 average ticket, about 31,600 transactions. Assume roughly two-thirds of that volume is on regulated cards.
| Pricing model | Annual cost on this debit volume | Effective rate |
|---|---|---|
| Interchange-plus, regulated debit passed through at cap, exempt at ordinary rates, plus assessments and markup | $16,710 | 1.39% |
| Flat rate, 2.6% plus $0.10 on everything | $34,358 | 2.86% |
Flat-rate pricing pools debit with credit and charges the blended figure. That is convenient, and for a merchant whose volume is mostly credit at small tickets it can be fair. For a debit-heavy merchant with mid-sized tickets it is the single most expensive line on the statement, and per our statement audit analysis it is invisible on a statement that shows one rate for everything. Per our processor switching analysis, the debit share of volume is the first thing to establish before comparing offers.
The second lever: which network carries the exempt transactions
Every debit card in the US must be enabled on at least two unaffiliated networks, so that the merchant has a choice of route. For regulated cards the cap applies whichever route is taken. For exempt cards, the networks price differently, and the merchant, or its processor on its behalf, chooses.
On the exempt third of this merchant's volume, routing to a network pricing at 0.75% plus $0.10 instead of 1.1% plus $0.15 saves about $2,023 a year. Smaller than the pricing-model lever, and it requires nothing from the merchant except a processor that routes rather than defaulting to the card's primary brand.
- PIN debit has traditionally routed over the alternate networks and been cheaper.
- PINless debit lets those networks carry transactions without a PIN, including online.
- Online debit was clarified in 2023 to require the same two-network choice as in-store, so the routing option now exists for card-not-present too.
Ask the processor one question: do you least-cost route debit, and can I see the routing split? Per our downgrade analysis, a processor that cannot show which network carried each transaction is not routing deliberately, and per our tap to pay analysis contactless and wallet transactions have their own routing behaviour worth checking.
Regulated debit is cheap only if the pricing lets you see it
On $1.2 million of debit volume, flat-rate pricing cost $17,648 a year more than passing the regulated cap through. HL Hunt AI Payment Processing prices on interchange-plus, routes exempt debit to the lowest-cost network, and shows the regulated, exempt and routing split on every statement.
Steering toward debit, and its limits
If debit is cheaper, a merchant has an interest in customers using it. The levers are real and bounded.
| Lever | Effect and limit |
|---|---|
| Offering a debit option prominently at checkout | Shifts some volume; customers who want credit rewards will not move |
| Discounts for debit or cash | Per our surcharging analysis, permitted within rules that differ from surcharging credit |
| Pay-by-bank as a further step | Per our pay by bank analysis, cheaper still, with different reversal and adoption characteristics |
| Minimum purchase for cards | Permitted for credit up to a limit; the fixed component of the debit cap makes small tickets expensive either way |
The reason debit is cheaper is also the reason it is different to accept. Per our reversibility analysis, a debit transaction draws on the customer's own funds and carries dispute rights that differ from credit, and per our decline analysis debit declines for insufficient funds behave differently from credit declines. The lower fee is paid for in a slightly different risk profile, which is manageable and worth knowing.
Where the saving does not exist
A coffee shop at a $6 ticket gains almost nothing from regulated debit, because $0.22 on $6 is 3.7% before the percentage is added. A merchant whose customers are overwhelmingly credit users gains little from routing. And a merchant on a flat-rate plan at low volume may find the flat rate's simplicity worth more than the few hundred dollars interchange-plus would save. The $17,648 figure belongs to a debit-heavy, mid-ticket, mid-volume merchant, and the first step is finding out whether that describes you.
What to do
- Find your debit share and your average ticket. Per our tender analysis, the mix by tender type is the number everything else depends on.
- If debit is a large share at a ticket above about $20, get interchange-plus pricing and confirm the regulated cap is passed through.
- Ask for the regulated versus exempt split on your statement, by month.
- Ask whether exempt and PINless debit is least-cost routed, and for the network split.
- Check card-not-present debit is routed too, since the two-network requirement now applies online.
- Reconcile the savings. Per our reconciliation analysis, a routing change that does not show up as a lower effective rate on the statement did not happen.
- Revisit when the cap changes. The regulated figure is under review; a lower cap widens the gap between debit and credit and between pricing models.
Item two is where the money is. On this merchant, the pricing model is worth about nine times the routing choice, and per our B2B card analysis the same principle, that the merchant only benefits from a lower interchange category when the pricing passes it through, applies to every category where interchange is reduced.
Ask for the routing split, not just the rate
A processor that cannot show which network carried each debit transaction is not routing on your behalf. HL Hunt AI Payment Processing reports regulated, exempt and network routing by month, so the saving is visible in the effective rate rather than promised in the pitch.
Frequently asked questions
Debit from large issuers is capped at about $0.22 plus 0.05%, which is 0.63% on a $38 ticket and 0.23% on $120. Smaller issuers are exempt.
No. On $1.2 million of debit volume, flat-rate pricing cost $17,648 a year more than interchange-plus with the cap passed through.
Choosing the cheaper of the two networks every debit card must carry. Worth about $2,023 a year on this merchant's exempt volume, in-store and online.
Small-ticket, credit-heavy, and low-volume merchants. The saving belongs to debit-heavy merchants with tickets above roughly $20.
Key takeaways
- Regulated debit interchange is capped at about $0.22 plus 0.05%, so its effective rate depends on ticket size.
- That is 1.88% at a $12 ticket, 0.63% at $38, and 0.23% at $120.
- On $1.2 million of debit volume, flat-rate pricing cost $17,648 a year more than interchange-plus.
- Under flat-rate pricing the cap exists but the merchant never sees it; the processor keeps the difference.
- Every debit card carries two unaffiliated networks, and routing exempt cards to the cheaper one saved about $2,023.
- The two-network choice applies online since 2023, so card-not-present debit can be routed too.
- Small-ticket, credit-heavy, and low-volume merchants gain little; the saving belongs to debit-heavy mid-ticket merchants.
- The pricing model is worth about nine times the routing choice on this merchant, and both are invisible on a one-rate statement.
This guide is educational and does not constitute financial, legal, or compliance advice. All figures are stylized illustrations using assumed volumes, ticket sizes, regulated and exempt shares, network pricing, and processor markups, and do not describe any particular merchant, processor, or network. The regulated debit interchange cap, the asset threshold for exemption, network routing requirements, and network pricing are set by regulation and network rules that have been subject to proposed changes and litigation and may differ from the figures used here; confirm current figures with your processor before making decisions.