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Interchange-Plus vs. Flat-Rate Pricing: What the Difference Means for You

Direct answer: interchange-plus passes the card networks’ wholesale cost to you plus a stated markup, so your rate moves with the card mix you accept. Flat-rate charges one fixed percentage regardless of card, trading possible savings for predictability. Neither is universally better: high-ticket, low-volume businesses often favor flat-rate simplicity; higher-volume businesses usually favor interchange-plus transparency. Your card mix decides.

How interchange-plus behaves

With interchange-plus, every transaction’s cost is traceable: the network’s interchange for that card type, plus your provider’s markup. That transparency makes statements auditable and rewards businesses whose cards skew favorable. The trade is statement complexity — the line items are real, and there are more of them.

How flat-rate behaves

Flat-rate folds everything into one number. Budgeting is trivial, statements are short, and a bad month of card mix costs you nothing extra. The trade is that favorable cards are priced the same as expensive ones, so the simplicity has a ceiling: the more volume you run, the more that ceiling tends to matter.

The deciding variable is your card mix

Pull your last three months of statements and count what portion of volume runs on cards that carry high network costs. Heavy consumer-card volume with small tickets tends to fit flat-rate; B2B volume, larger tickets, and any volume on commercial cards tends to fit interchange-plus. If you cannot tell from your statements which situation you are in, that itself is the finding — ask your provider, or ask us, to break the mix out by card type.