What 'effective rate' actually means
Effective rate is the all-in cost of payments expressed as a percentage of card volume. If you took 50,000 in card payments and paid 1,650 in total fees, your effective rate is 3.3 percent. It includes percentage fees, fixed fees, surcharges, FX margin, refunds where the fee is retained, and dispute fees.
It is the right unit because it lets you compare unlike things — a flat-rate provider against a percentage-plus-fixed one — on a single number.
The six things that push it up
Each of these adds a measurable amount to the effective rate. The combinations are what make real bills different from headline expectations.
- Fixed per-transaction fee on low AOV — adds 1 to 5 percentage points at AOV under 20.
- International cards — typically 1 to 1.5 percentage points cross-border surcharge.
- Currency conversion — usually 1 to 4 percentage points depending on provider.
- Premium and corporate cards — 0.5 to 1.5 percentage points above standard rates.
- Refund handling — small but real if your provider keeps the percentage fee.
- Chargebacks — fixed cost per dispute, material above 0.5 percent rate.
A worked example
A boutique sells online to UK and EU buyers from a US base, AOV 65, 800 transactions a month, 30 percent international, 3 percent refund rate, 0.2 percent chargeback rate. Headline Stripe rate: 2.9 percent + 0.30.
Naive expectation: 2.9 percent + roughly 0.5 percent fixed-fee equivalent at AOV 65 = 3.4 percent. Actual after international surcharge (about 0.5 percentage points blended) and FX margin on EU card payments (about 0.3 percentage points blended) and unrecovered refund fees: roughly 4.3 percent. The gap between expectation and reality is paid out of margin every month.
Why the headline never matches
Providers quote the headline because it is the simplest comparable number. Surcharges, FX margin, and refund handling are rarely on the homepage. None of this is hidden — it is in the fee schedule — but the headline is the only number most owners ever see.
Calculate effective rate quarterly. If it has drifted up by more than 0.3 percentage points without an obvious reason, your product mix has shifted and the gateway choice may no longer be optimal.