- The rebate is funded by interchange — the 2–3% fee the supplier pays — so your gain is literally the supplier's cost. That tension is the whole story.
- Rebate rates run roughly 1–1.75% of routed spend; Visa standardized its B2B virtual-card interchange to 2.0% in October 2025, giving the category a clearer floor.
- The number that decides the program is not the rebate rate — it is addressable spend, the share of payables that runs through suppliers who will actually accept a card. That is usually 15–40% of vendors and a smaller share of dollars.
- Headline math ($X payables × rebate rate) overstates the prize by 2–3x. Real math is addressable spend × rebate rate.
- The 2026 interchange settlement and the Visa CEDP shift (Level 2 gone, Level 3 required) change both the rebate ceiling and the data you must capture to hit it.
Virtual cards get pitched as free money for accounts payable, and the pitch is not wrong — it is just incomplete. A virtual card is the only AP payment method that can pay you rather than cost you, because the card issuer shares interchange revenue back with you as a rebate (AutoPayables, 2026). The problem is that almost every program is sized off the wrong number, and the gap between the pitch and the payout is where finance teams get disappointed. Here is the teardown we run before anyone signs a virtual card program.
Number one: where the rebate actually comes from
The rebate is not a gift from your bank. It is a slice of interchange — the per-transaction fee the supplier's acquiring bank pays your issuing bank every time a card is used. On commercial and virtual cards that fee sits in the richest band, roughly 2 to 3 percent of the transaction, precisely because that is the pool a rebate can be paid out of; the cheaper the rail, the smaller the interchange, and the smaller any rebate it could fund (Corpay, 2026). Visa standardized its B2B virtual-payment interchange to 2.0 percent under its October 2025 schedule update, which gave the category a clearer floor than it had before (Corpay, 2026).
Out of that pool, the issuing bank keeps a share and rebates the rest to you, the buyer. Rebate rates in commercial card programs commonly land between roughly 1 and 1.75 percent of routed spend, scaling with volume, payment terms, and how hard you negotiate (AutoPayables, 2026). Nothing is charged to your company to earn it — which is the single point most rebate pitches never explain clearly (Corpay, 2026).
The operator's read
Your rebate is the supplier's cost, dressed up. Every basis point you earn is a basis point of margin the supplier gives up to get paid. That is not a reason to avoid virtual cards — it is the reason acceptance, not rebate rate, is the variable that actually moves the outcome. Negotiating a higher rate on spend nobody will route is optimizing the wrong number.
Number two: why suppliers say no
Because they are the ones paying the 2 to 3 percent that funds your rebate. A supplier weighing card acceptance is deciding whether faster payment and less collections chasing are worth a direct margin hit — and for a lot of them the answer is no (AutoPayables, 2026). Acceptance is not random, though; you can predict it before you ask.
| Likely to accept | Likely to decline |
|---|---|
| Suppliers who already take cards from other customers | Large suppliers with leverage over you |
| Marketing, travel, media & professional services vendors | Commodity and freight suppliers on thin margins |
| Smaller vendors who value getting paid fast | Utilities, rent, and tax authorities |
| Vendors with a payment gateway already in place | Suppliers with no card acceptance at all |
| Invoices in the low four figures | Very high-value invoices, where interchange is a fortune |
The pattern that trips teams up: your largest spend usually sits with the suppliers most able to refuse. So in most AP files, card acceptance lands on somewhere between 15 and 40 percent of vendors and a smaller share of total dollars (AutoPayables, 2026). The strongest argument to a hesitant supplier is the honest one: they are paying roughly 2.5 percent to get paid weeks earlier and to stop chasing you.
Number three: addressable spend — the only number that matters
This is where programs are won or lost. The rebate you will actually earn is not your total payables times the headline rate — it is your addressable spend times the rate, where addressable spend is the portion of payables that runs through suppliers who accept the card (Corpay, 2026). Get this wrong and you will forecast two to three times the rebate you collect.
Worked example
Suppose you pay out $20M a year. The headline pitch multiplies $20M by a 1.25% rebate and promises $250,000. But if only 30% of that spend runs through accepting suppliers, the real number is $20M × 30% × 1.25% ≈ $75,000. Same rebate rate, one-third the payout — because acceptance, not the rate, set the ceiling. On a program where you enable suppliers well and lift acceptance to 45%, that same rate yields ~$112,500. The lever is enablement, not the term sheet.
What 2026 changed — and what it means for your ceiling
Two shifts matter this year. First, the roughly $38 billion Visa/Mastercard interchange settlement received preliminary court approval in June 2026, heading to a final hearing in November; if finalized it would cut average U.S. credit interchange by about 10 basis points for five years and relax the “Honor All Cards” rule, letting merchants decline certain premium and commercial card products (Merchant Advisory Group, 2026). A lower interchange pool and easier supplier refusal both press on the rebate side — worth modeling, not panicking over.
Second, Visa eliminated Level 2 interchange for small-business and commercial cards in April 2026; the only path to reduced commercial-card interchange now runs through full Level 3 line-item data under the Commercial Enhanced Data Program (Merchant Cost Consulting, 2026). For a buyer, that is a data-capture requirement with real money attached: if your AP system cannot submit Level 3 data, you are not qualifying for the best rates, and both your program and your suppliers feel it.
How to actually size and run the program
- Segment your AP file first. Score every vendor on the accept/decline pattern above before you model anything. Addressable spend is an output of that segmentation, not an assumption.
- Model on addressable spend, with an acceptance ramp. Enablement takes time; a realistic curve beats a launch-day number.
- Invest in supplier enablement. The rebate ceiling is set by how many suppliers you can bring on and keep on — that is the work, and it is where issuers and acquirers underinvest (Be Shaping The Future, 2026).
- Fix Level 3 data capture. Without it you forfeit the best interchange and, indirectly, rebate headroom.
- Route the rest intelligently. Non-accepting suppliers are not failures — they belong on ACH, same-day ACH, or real-time rails. Card is one lane in a multi-rail strategy, not the whole road.
That last point is the connective tissue: virtual card acceptance and rail routing are the same decision viewed from two sides. We lay out the routing logic in our field note on which rail for which B2B flow, and the interchange path itself in the processor vs. network path teardown.
Sizing a virtual card program — or trying to fix a stalled one?
Whether you're modeling addressable spend before you commit, designing the supplier enablement that actually lifts acceptance, or fixing the Level 3 data gap quietly costing you rebate, that is exactly the work our senior operators — from Fiserv, FICO, Oracle, Citi, and Wells Fargo — do with growth-stage teams. See how in our B2B payments advisory.
Book a working callFAQ
How does a virtual card rebate actually get funded?
The rebate is funded by interchange — the per-transaction fee the supplier's acquiring bank pays the buyer's issuing bank on every card payment. On a commercial or virtual card that fee typically runs 2 to 3 percent of the transaction, and the issuing bank shares a portion of it back to the buyer as a rebate, commonly 1 to 1.75 percent of routed spend. Nothing is charged to the buyer's company to earn it. The catch is that the supplier absorbs the interchange, which is exactly why a rebate program lives or dies on supplier acceptance, not on the rebate rate you were quoted.
Why do suppliers decline virtual card payments?
Because the supplier pays the interchange that funds your rebate — roughly 2 to 3 percent of the invoice — so accepting a card is a direct margin hit for them. Suppliers most able to refuse are usually your largest ones: commodity and freight vendors on thin margins, utilities, rent, and tax authorities. Suppliers likely to accept are those who already take cards, value being paid instantly, or have smaller invoices where the interchange cost is tolerable. In most AP files card acceptance lands on 15 to 40 percent of vendors and a smaller share of total dollars, because your biggest spend sits with the suppliers most able to say no.
How do I estimate the real rebate from a virtual card program?
Do not multiply your total payables by the headline rebate rate — multiply only your addressable spend, meaning the portion that runs through suppliers who will actually accept a card. If you pay out $20 million a year, realistically enroll 30 percent of it, and negotiate a 1.25 percent rebate, the real number is $20M x 30 percent x 1.25 percent, or about $75,000 — not the $250,000 the headline math implies. The program's value is set by acceptance and enablement, so the work that matters is supplier enablement and full Level 3 data to qualify for the best interchange, not chasing a higher quoted rate.