Capital One Cards Are Moving to the Discover Network: What Merchants Should Check
By Yan Payments
What’s actually changing with Capital One cards?
Capital One has spent 2026 moving millions of its debit cards onto the Discover network instead of Mastercard, with roughly 25 million debit cards converted so far according to payments-industry trade coverage. Credit cards are a separate, slower process. Capital One has started testing select credit card accounts on Discover too, but as of this writing it hasn’t said how much of its credit portfolio will move or on what timeline. Some cards, including Capital One’s Venture X and several co-branded cards, are staying on Visa for now. If you’re taking Capital One cards at the counter, you’re probably already seeing a mix of networks on cards that used to all run one way.
Why is Capital One doing this?
Capital One’s acquisition of Discover closed in 2025, and running its own cards over its own network instead of paying Visa or Mastercard to do it is the obvious reason to shift volume over. It also gives Capital One control over more of the transaction chain, from issuing to network to acquiring, something it didn’t have when its cards ran exclusively over networks it doesn’t own.
Does “99% merchant acceptance” mean there are no gaps?
Discover and Capital One have both pointed to a figure of around 99% merchant acceptance in the US, and for most retail and restaurant counters that’s close to true. But there are real, named exceptions. Costco is the one people run into most: it doesn’t accept Discover credit cards in its warehouses, at the gas pump, or on its website, a policy tied to its long-running Visa partnership. If your business runs through a venue, platform, or marketplace, it’s worth checking whether that venue has its own network exclusions before you assume every converted card works everywhere yours does.
Cardholders who’ve gone through the migration have also reported new card numbers, new CVVs, and occasional declines in the weeks after a reissue. On your side, that can show up as a customer whose “same card” suddenly doesn’t match what’s on file for a saved payment method or a subscription.
Why could interchange costs change?
This is the part worth watching closest. Discover is a closed-loop network, meaning it issues, processes, and acquires on its own system rather than licensing a brand to many different banks the way Visa and Mastercard do. That structural difference matters because the Durbin Amendment’s debit interchange cap, currently 21 cents plus 0.05% of the transaction for banks with more than $10 billion in assets, is a Reg II rule tied to how those bank-card networks are set up. Discover’s closed-loop structure has historically sat outside that capped category for some transactions, which is part of why several payments-industry outlets have flagged that debit interchange on migrated Capital One cards could run meaningfully higher than what the same card generated when it ran over Mastercard. The specific numbers vary by source and by transaction type, so don’t treat any single percentage you see quoted as settled fact, but the direction industry analysts are pointing to is up, not flat.
What should you actually check with your processor?
Ask your processor or statement provider whether they can break out interchange by card brand and issuing bank, not just by card type. If a meaningful share of your Capital One-branded volume has shifted from a Mastercard interchange category to a Discover one, that should show up in a recent statement. It’s a fair, direct question to put to whoever processes your transactions: has anything about my effective rate changed because of this migration, and are my terminals and checkout current on accepting Discover-branded cards that used to show up as something else.
A few questions worth asking this week
- Has my average effective rate moved in the last few statement cycles, and can you point to which card brand is driving it?
- Are my terminals and online checkout current on Discover network rules, since more of my Capital One volume may now route there?
- If I rely on saved cards or subscriptions, have I seen a rise in declines tied to reissued cards?
- Does any marketplace, venue, or platform I sell through have its own card network exclusions I should know about?
If you want a second set of eyes on your statement, Yan Payments can walk through your recent interchange breakdown with you. Check out yanpayments.com/hardware if you’re also due for a terminal refresh.
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