- The rebate is funded by interchange (the per-transaction fee suppliers pay) — roughly 2–3% — so your gain is literally the supplier's cost.
- Rebate rates run roughly 1–1.75% of routed spend; Visa standardized B2B virtual-card interchange to 2.0% in October 2025.
- The number that decides the program is addressable spend — the share of payables that runs through suppliers who'll actually accept a card, usually 15–40% of vendors.
- Headline math ($X payables × rebate rate) overstates the prize by 2–3x. Real math is addressable spend × rebate rate.
- The 2026 interchange settlement and Visa's CEDP shift (Level 2 gone, Level 3 required) change both the rebate ceiling and the data you need to hit it.
Virtual cards get pitched as free money for accounts payable (AP), and the pitch isn't wrong — just incomplete. The card issuer shares interchange revenue back with you as a rebate (AutoPayables, 2026). But almost every program is sized off the wrong number, which is where finance teams get disappointed. Here is the teardown we run before anyone signs a program.
Where the rebate comes from
The rebate isn't a gift from your bank. It's a slice of interchange (the per-transaction fee the supplier's bank pays your issuing bank) — on commercial and virtual cards, roughly 2 to 3 percent of the transaction (Corpay, 2026). Visa standardized its B2B virtual-payment interchange to 2.0 percent under its October 2025 schedule update (Corpay, 2026).
The issuing bank keeps a share of that pool and rebates the rest to you. Rates commonly land between 1 and 1.75 percent of routed spend, scaling with volume and negotiation (AutoPayables, 2026). Nothing is charged to your company to earn it — the point most rebate pitches skip (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. That's not a reason to avoid virtual cards — it's why acceptance, not rebate rate, is the variable that actually moves the outcome.
Why suppliers say no
Because they're the ones paying the 2 to 3 percent that funds your rebate. A supplier weighing card acceptance decides whether faster payment is worth a direct margin hit — and for many, the answer is no (AutoPayables, 2026). Acceptance isn't 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. In most AP files, card acceptance lands on 15 to 40 percent of vendors and a smaller share of total dollars (AutoPayables, 2026).
Addressable spend: the number that matters
This is where programs are won or lost. The rebate you'll actually earn is not your total payables times the headline rate — it's your addressable spend (the portion of payables running through accepting suppliers) times the rate (Corpay, 2026). Get this wrong and you'll 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 changed in 2026
Two shifts matter. 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.
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 (CEDP — Visa's system for qualifying transactions for lower rates) (Merchant Cost Consulting, 2026). If your AP system can't submit Level 3 data, you won't qualify for the best rates.
How to actually size and run the program
- Segment your AP file first. Score every vendor on the accept/decline pattern above before modeling anything. Addressable spend is an output of that work, 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 supplier enablement that lifts acceptance, or fixing a Level 3 data gap costing you rebate, that's the work our senior operators 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 bank pays the buyer's issuing bank. That fee typically runs 2 to 3 percent, and the issuing bank shares a portion back as a rebate, commonly 1 to 1.75 percent of routed spend. The supplier absorbs the cost, which is why a rebate program lives or dies on supplier acceptance, not the quoted rate.
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. Suppliers most able to refuse are usually your largest ones: commodity and freight vendors, utilities, rent, and tax authorities. In most AP files, card acceptance lands on 15 to 40 percent of vendors and a smaller share of total dollars.
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, the portion that runs through suppliers who'll actually accept a card. Pay out $20 million, enroll 30 percent, negotiate a 1.25 percent rebate: the real number is about $75,000, not the $250,000 the headline math implies. The work that matters is supplier enablement and Level 3 data, not chasing a higher quoted rate.