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IC++ vs Blended Rates and Terminal Rental

UK merchant statements hide margin in plain sight. This guide explains blended vs interchange-plus (IC++) pricing, how terminal rental and monthly minimums change your true cost per pound taken, and what to ask before you renew.

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Blended MDR — simple headline, opaque detail

A blended merchant discount rate rolls scheme fees, interchange and acquirer margin into one percentage (sometimes plus a flat pence per auth). It is easy to quote and easy to compare in a one-line proposal — but you cannot see how much is cost (driven by card mix) versus margin. If your customers shift from debit to premium credit, or you take more Amex, your acquirer’s risk model may move — and blended renewals sometimes creep at renewal even when “headline MDR” looks flat.

Interchange-plus (IC++) — transparent building blocks

IC++ splits the statement: you pay interchange and scheme fees at cost (pass-through), then a fixed processing markup per transaction or as basis points. For SMEs with stable card mix and volume, IC++ often surfaces fairer economics because you are not subsidising other merchants’ expensive cards inside a pooled blended rate. The trade-off is complexity — finance teams must reconcile more lines. Pair this topic with our guides on Amex and international cards and surcharging rules.

Terminal rental, PCI and “platform” fees

Hardware is rarely “free” — rental is bundled into a minimum monthly service charge or amortised over a 36–48 month agreement. Ask for: (1) cash price vs rental, (2) replacement policy if the PIN pad fails, (3) whether P2PE scope reduction is included, and (4) if gateway or reporting modules carry separate licences. A few pounds a month on the invoice often exceeds the MDR savings you negotiated if you take low volumes.

Monthly minimums and break-even volume

A minimum monthly service fee tops you up when card turnover × MDR falls short. Seasonal businesses (events, tourism, construction) should model quiet months explicitly. Before signing, calculate: (rental + software + minimum) ÷ realistic net margin — that is the extra turnover you must generate just to cover acquiring overhead.

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