What is your effective processing rate?

What to include

For an all-in historical ratio, define which processing-related charges belong in the numerator. Some merchants include recurring account or equipment costs; others isolate transaction-processing costs. State your scope and use it consistently.

Ensure the sales volume in the denominator is defined consistently with the charges in the numerator. Refunds, chargebacks, reserves, adjustments, taxes, and timing mismatches can affect the calculation.

What the result cannot tell you

The ratio does not disclose the cost of every transaction type, prove the provider is overpriced, establish card-network interchange, or predict a competitor's performance.

Two months with different card mixes, average ticket sizes, or fee events may have different ratios even when the pricing agreement is unchanged.

A better comparison

Compare several periods, annotate unusual events, separate fixed and variable charges, and document the provider's pricing structure. If a change is being considered, compare written proposals against a consistent transaction mix and full operational costs.