Payment Processing Fees

Every time a customer swipes, taps, or clicks to pay with a card or digital wallet, a slice of that payment goes to the companies that make the transaction possible. Payment processing fees are the combined cost of three components: the interchange fee (paid to the card-issuing bank), the assessment fee (paid to the card network — Visa, Mastercard, Amex), and the processor markup (paid to your payment processor — Square, Stripe, PayPal, etc.).

Interchange fees make up the bulk of the cost and are set by the card networks — typically 1.5-2.5% for credit cards and 0.5-1.0% for debit cards. Assessment fees are small (0.13-0.15%). The processor markup is where you have negotiating room — it varies from flat-rate pricing (e.g., Square's 2.6% + $0.10 per tap) to interchange-plus pricing (e.g., interchange + 0.3% + $0.10 per transaction). Flat-rate pricing is simpler; interchange-plus is usually cheaper for businesses processing over $10,000-$15,000/month.

The total effective rate for most small businesses falls between 2.0% and 3.5% for credit card transactions. Amex cards tend to be more expensive (often 3.0%+ because they charge higher interchange fees). Debit cards are cheaper. Online transactions (card-not-present) cost more than in-person transactions because they carry higher fraud risk. And those per-transaction flat fees ($0.10-$0.30 per transaction) add up fast on small-dollar transactions — a $3 coffee at 2.6% + $0.10 loses 5.9% to fees, not 2.6%.

Payment processing fees are one of the largest and most overlooked expenses for small businesses. A business doing $500,000 in card sales at an average 2.8% rate pays $14,000 per year in fees — that's real money that comes straight off your bottom line. Understanding your fee structure lets you make smart decisions: negotiating better rates as your volume grows, encouraging debit card or ACH payments when possible, setting minimum purchase amounts for card payments (allowed up to $10 under the Dodd-Frank Act), and choosing the right processor for your transaction profile.