Pricing Model

Flat-Rate Pricing Explained

Flat-rate pricing charges a single fixed percentage per transaction — the same rate regardless of whether a customer pays with a basic debit card or a premium rewards credit card. It's the simplest pricing model, and it comes with clear trade-offs.

Last reviewed: July 4, 2026 · Editorial policy

Quick Answer

Flat-rate pricing bundles interchange, assessment fees, and processor markup into one rate (e.g., 2.6% + $0.10 per swipe). You pay the same rate regardless of card type. This makes billing simple and predictable but means you don't benefit when customers use lower-cost cards. It's most common with newer or lower-volume merchants who prioritize simplicity.

How Flat-Rate Pricing Works

Every card transaction involves interchange (paid to the issuing bank), assessment fees (paid to the card network), and processor markup. Under flat-rate pricing, these three costs are bundled into a single rate that applies uniformly to all transactions.

The bundled rate is designed to be profitable for the processor across a typical card mix — meaning the processor earns more margin when customers use low-interchange debit cards and less when they use high-interchange premium reward cards. The merchant always pays the same rate regardless.

Flat-rate processors typically separate rates by transaction channel: in-person (card present) rates are lower than keyed or online (card not present) rates, because card-present transactions carry lower fraud risk and thus lower interchange. Most flat-rate providers publish their rates publicly.

When Flat-Rate May Work Well

Very new businesses that want simple, predictable billing without learning interchange categories

Low-volume merchants where the per-transaction economics of interchange-plus don't justify complexity

Businesses with a mix of card types where a blended flat rate is competitive with actual interchange costs

Merchants who want to avoid monthly fees or long-term contracts common with some interchange-plus providers

Situations where rapid account setup and minimal documentation are priorities

When It May Not Fit

Higher-volume merchants where even a small difference in effective rate represents meaningful cost

Businesses with a card mix heavy in debit or basic credit, which carry lower interchange — you don't benefit from those savings under flat-rate

Merchants who want to audit processor charges separately from interchange costs

B2B merchants whose customers often use high-interchange corporate cards (which already have high interchange; flat-rate may not adequately cover them)

Advantages

Single rate makes billing easy to understand and predict
No need to understand interchange categories or card types
Often no monthly fees or long-term contracts
Quick setup with minimal underwriting for many providers

Trade-offs

You don't benefit when customers use lower-cost debit or basic credit cards
Harder to benchmark processor costs against alternatives
May have higher effective rate than interchange-plus for some card mixes
Some providers offer limited pricing transparency or customization

Common Misconceptions

❌ Myth: Flat-rate pricing is always more expensive than interchange-plus.

✅ Fact: Not necessarily. For merchants whose customers frequently use premium rewards cards (which carry high interchange), the flat rate may be close to or even lower than interchange-plus with a comparable markup. The only reliable comparison is calculating effective rate using your actual card mix.

❌ Myth: Flat-rate providers don't charge separate fees.

✅ Fact: Most flat-rate providers still charge for chargebacks, ACH refunds, hardware, and international card transactions at different rates. 'Flat rate' refers to the base transaction rate — other fees still apply.