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Payments Glossary · Fees & Pricing

Flat-Rate Pricing

Also called simple pricing, one-rate pricing, Square-style pricing

One published rate for every card, like 2.6% + 10 cents. Predictable, genuinely simple, and expensive once you have real volume.

What it is

Flat-rate pricing charges the same percentage and per-item on every transaction regardless of what interchange actually cost. Square, Stripe, PayPal, Toast and Clover's direct plans all use variants. Typical 2026 published rates cluster around 2.6%-2.9% plus $0.10-$0.30 card-present, and 2.9%-3.5% plus a per-item card-not-present, with keyed and invoice rates higher. The economics are straightforward and not sinister. The provider pays real interchange, which on a debit-heavy card-present book might average 1.3%-1.7%, and keeps the spread. On a rewards-heavy or commercial-card-heavy book they can lose money on individual transactions. Flat-rate is a portfolio bet, and you are paying an insurance premium for predictability plus the software, hardware, onboarding and instant approval that comes with it. For a genuinely small merchant, it is often the right answer. No monthly minimum, no PCI fee, no statement fee, no contract, no early termination fee, same-day setup. When you are doing $4,000 a month, the difference between 2.75% and 2.4% is $14, and any month you spend arguing about it you have lost money. The crossover is a volume question. Published subscription-model comparisons put the breakeven against flat-rate pricing around $10,000-$11,000 a month in card volume. Above that band, the flat rate's simplicity premium starts costing more than the fees a fully-loaded interchange-plus account would carry.

Why it matters to your business

At $8,000 a month, flat-rate probably wins on total cost once you count the monthly fees a traditional account would add. At $40,000 a month, a 2.75% flat rate costs $1,100 while a well-built interchange-plus account at roughly 2.35% all-in costs $940 - $160 a month, $1,920 a year, for identical functionality. At $100,000 a month the gap is typically $400-$700 a month. That's an employee's worth of payroll tax, or a year of marketing, sitting inside a pricing decision you made when the business was a quarter of its current size.

Where it gets contested

The flat-rate providers are the most honest advertisers in payments and the least transparent about margin. Both statements are true. Square tells you 2.6% + 10 cents and charges 2.6% + 10 cents - there's no downgrade, no qualified tier, no surprise. And Square will never tell you that your debit-heavy Tuesday lunch rush cost them 1.4% and earned them 120 basis points on volume they did nothing special to earn. The deeper issue is the same pass-through problem as tiered pricing. Flat-rate is a fixed price. When the 2026 settlement's 10 basis point interchange reduction lands, flat-rate merchants receive zero. When Regulation II is resolved, flat-rate merchants receive zero. Toast's disclosed fintech net take rate slipped from 61 to 59 basis points in Q2 2026 and Shift4 runs a 65 basis point blended spread - those are the margins being earned on top of your volume, and they compress only when the provider chooses to compete, never because your costs fell. The industry frame is 'you're paying for simplicity.' Fair. Just know the price of simplicity, in dollars, at your current volume - and re-check it every year, because the price rises with your success and nobody sends a notice.

How to check it yourself

Compute your effective rate - total fees over total volume. If you are on flat-rate, it will be very close to the published rate, which is the model working as advertised. Then get an interchange-plus quote with every fee listed and model your last three months against it. As a rule of thumb, if the savings clear $150 a month, the switch pays for the hassle. If it doesn't, stay put and stop worrying about it.

Receipts

Claims above that are checkable, with where to check them. Published so you do not have to take anyone's word for it.