Compare Interchange-Plus Processing: Why It's Your Best-Fit Option

Compare Interchange-Plus Processing: Why It's Your Best-Fit Option

Every card transaction has an underlying interchange fee set by the card networks (Visa, Mastercard and others) and paid to the card-issuing bank -- it varies by card type, rewards tier and how the card was entered, typically landing somewhere around 1.5% to 2.6%. An interchange-plus pricing model passes that real cost straight through to you and adds a small, transparent markup on top, commonly a fraction of a percent plus a small fixed fee, rather than blending everything into one flat number.

A flat-rate processor like Stripe or Square instead charges one blended rate -- typically around 2.9% + $0.30 -- regardless of which specific card was used, absorbing the difference between a cheap debit card and an expensive rewards credit card into a single predictable number. That predictability is genuinely valuable at low volume, but at real scale, the blending starts working against you if your actual card mix skews toward lower-cost cards.

Whether interchange-plus actually saves you money depends entirely on your real card mix and volume: a business that sees mostly basic debit cards can often save meaningfully, since true interchange cost sits well below a flat rate's blended average. A business seeing a lot of premium rewards cards may find a flat rate works out similarly, since it's effectively being subsidized by the platform's overall mix of cheaper transactions elsewhere. The only way to know for sure is to get a real statement analysis showing your actual blended interchange rate -- not to guess at the 1.5-2.6% range.

There's a second, separate reason this result comes up: if your business is in a higher-risk or restricted category -- certain regulated products, subscription/continuity billing, high chargeback-rate industries, or categories some mainstream processors decline outright -- a standard consumer-facing app like PayPal, Venmo or Cash App often isn't built to support you reliably, and accounts in these categories risk holds or closure on general-purpose platforms. A dedicated processor or payments consultant who explicitly works with your category (sometimes still interchange-plus priced, sometimes a specialized high-risk rate) is the safer starting point rather than building your business around a consumer app's standard terms of service.

For most sellers just starting out, a flat-rate processor's simplicity is the right call -- interchange-plus rewards knowing your numbers, and that knowledge only comes with real transaction history. But once you're processing enough monthly volume to justify the analysis, or your category needs a processor built for it, this is the path worth exploring with an actual quote in hand rather than the default flat-rate app you started with.

Source: Publicly published card network interchange rate ranges (commonly 1.5-2.6%) and typical interchange-plus markups (commonly 0.2-0.5% + a small per-transaction fee); flat-rate comparison figures from Stripe's and Square's standard published pricing. Note: get a real statement analysis for your actual card mix before switching.

How Generic Credit Card Processing (Interchange-Plus) compares

* Illustrative figures for a same-size sale, rounded -- use the calculators below for your exact numbers.