A low processing rate can be expensive: price the whole payment flow

“The competitor is 0.3 percentage points cheaper” sounds like a reason to switch. First establish what the percentage covers and what happens to small tickets, refunds and manual exceptions. A useful negotiation starts with your own transaction mix, consistent cost boundaries and a separate view of withheld cash.

For internal analysis, an effective payment-cost rate can be calculated as selected payment-related expenses divided by the corresponding processed volume. Write the definition next to the result. The label alone does not ensure that two providers, or even two teams, are measuring the same thing.

A hypothetical month: from 2% to 3%

Every number in this example is invented for illustration, not quoted from a provider. Assume 1,000 successful payments of €40, giving gross processed volume of €40,000. For simplicity, all the following costs are deducted from the same settlement balance within the month.

• Percentage fee: €40,000 × 2% = €800.
• Fixed transaction fee: 1,000 × €0.20 = €200.
• Payout charges: €20 in total.
• An additional payment tool: €80 for the month.
• Currency conversion: €100 in total, as recorded in the report.

Total expenses are €1,200. Dividing €1,200 by €40,000 gives an effective rate of 3%. The headline 2% described one component. This does not establish that the additional products are poor value; it makes their cost visible so their usefulness can be assessed.

Now suppose customers received €2,000 in refunds, while the expenses in our example remained unchanged. Volume after refunds is €38,000. Expenses divided by that amount are approximately 3.16%. Both 3% and 3.16% are mathematically correct. Consistency of the denominator determines whether the result is useful across periods.

Fee treatment on refunds varies. The US Stripe pricing page, for example, says certain original transaction fees are not returned when a payment is refunded. Treat that as a contract term to check in your own arrangement, rather than a market-wide rule.

A smaller payout does not reveal the fee

Add €2,000 of new reserve withholding, with no release of older reserves. Starting from €40,000, subtract €1,200 of expenses, €2,000 of refunds and €2,000 of reserve additions. The resulting payout amount is €34,800.

The €5,200 difference equals 13% of the original volume. Calling it a 13% fee would combine three different things: service costs, money returned to customers and temporarily unavailable funds. PayPal's reserve explanation describes the last category as funds that cannot currently be used or withdrawn. Any eventual charge or loss needs separate identification.

Unpack the quote

Card pricing can contain several components. For example, Adyen describes Interchange++ in terms of transaction-level interchange and scheme fees. Comparing one provider's markup with another provider's complete charge would therefore produce a misleading result.

List percentage fees, fixed transaction fees, currency conversion, payouts, additional products and monthly minimums. Establish which events trigger each charge: successful payments, attempted payments, refunds or something else. Where service taxes apply, agree how they will be treated in the comparison. Avoid silently mixing tax-inclusive and tax-exclusive figures.

Find the transaction size where the ranking flips

Compare two entirely invented tariffs with no other fees. A charges 1.9% plus €0.30 per successful payment; B charges 2.5% plus €0.10. On a €10 purchase, they cost €0.49 and €0.35 respectively. On a €100 purchase, they cost €2.20 and €2.60. The cheaper option changes with the purchase size.

The break-even amount is the fixed-fee difference divided by the percentage difference: €0.20 / 0.006, or approximately €33.33. Below it, B is cheaper in this simplified model; above it, A is cheaper. In this linear model, total volume and transaction count determine the total bill. For an actual contract, also inspect ticket bands, methods and currencies: different terms and additional fees can change the comparison.

This exercise is useful before a promotion. Selling a low-priced add-on through a separate payment increases the fixed-fee count. Combining purchases changes the customer flow and must respect the customer’s agreement. Evaluate the economics with the product team instead of treating every possible fee saving as an automatic instruction to redesign checkout.

Test the transaction mix

Keep gross volume at €40,000 but reduce the average transaction to €20. There are now 2,000 payments. At €0.20 each, the fixed component rises from €200 to €400. Holding the remaining assumptions constant, total expenses become €1,400 and the effective rate becomes 3.5%.

No tariff changed. The sales mix changed. This is why proposals should be tested against your own distribution of transaction sizes, currencies, payment methods and refunds. Also model lower volume: a subscription or minimum monthly charge is spread over a smaller base.

What is an additional completed order worth?

Lower fees and greater profit can point in different directions. Suppose the more expensive option costs an additional €200 over a period and your evaluation attributes twenty additional correctly completed orders to it. If each contributes €12 after variable product and fulfilment costs, but before this payment-price difference, the additional contribution is €240. Subtracting €200 leaves €40.

These are illustrative assumptions. The result changes if the additional orders have more returns, require expensive support or actually came from a different customer mix. Do not treat the entire revenue of a “recovered order” as profit. Use comparable groups and the same observation window.

Include manual work as a separate, transparent estimate: exception count, average handling time and the chosen hourly cost. It helps evaluate workload, but folding it invisibly into the processing percentage makes the next negotiation confusing. The provider’s charges and the cost of your own team should remain distinguishable, even when both matter to the decision.

Use itemised costs and balance movements to check the calculation. A bank statement alone usually cannot explain every component. Stripe's balance report is an example of a report connecting opening balance, activity and closing balance. Match the period and currency, find separately invoiced products and separate one-off implementation costs from recurring operating costs.

Before negotiating, price one actual month under both proposals. Present expenses, available cash and sensitivity to sales mix as three separate results. The discussion then stays tied to your own flow, and a proposed discount has a testable monetary value.