A transaction fee is the charge a bank or payment processor takes each time a customer pays you with a card. For most card payments it lands somewhere between 1.5% and 3.5% of the sale, and it isn’t one fee going to one place. It’s three separate charges stacked together: one to the bank that issued the customer’s card, one to the card network, and one to the processor that handles the payment for you. Which pricing model you sign up for decides how those charges show up on your statement and how much room you have to negotiate.
Where the Money Actually Goes
Every card payment passes through four parties, and each one takes a cut before the money reaches you.
Your acquiring bank (also called your merchant bank) gives you the hardware or software to accept cards and holds the funds on the way in. When a card is swiped, tapped, or entered online, the acquiring bank sends the details through the card network — Visa, Mastercard, American Express, or Discover — which routes the request to the issuing bank, whichever institution gave the customer their card. The issuing bank checks the account, approves or declines, and if it approves, the funds travel back down the same chain to your account. Each participant skims a fee. The whole thing takes seconds, and you pay for the speed.
The Three Layers of a Card Transaction Fee
What looks like a single “processing fee” on your statement is really three charges stacked on top of each other. Only one of them is negotiable.
Interchange
Interchange is the biggest slice and goes to the issuing bank. It compensates the bank for extending credit and running the cardholder’s account, and it varies with the card type. A plain debit card costs you less than a premium travel-rewards credit card, because someone has to pay for the points and cash back.
Debit interchange is capped by federal law. The Durbin Amendment requires that debit interchange charged by large banks be “reasonable and proportional to the cost incurred by the issuer,” and Federal Reserve rules implementing that standard limit what banks with $10 billion or more in assets can charge. Smaller banks are exempt.1Office of the Law Revision Counsel. 15 USC 1693o-2 – Reasonable Fees and Rules for Payment Card Transactions Credit card interchange has no equivalent cap and typically runs 1.5% to 2.5% or more depending on the rewards tier. This is why some small businesses steer customers toward debit or offer a cash discount.
Assessments
Assessment fees go to the card network for running the payment rails and licensing the brand. They’re small, a fraction of a percent, and non-negotiable. They scale with your total monthly volume rather than with individual sales.
Processor Markup
The processor markup is what your acquiring bank or payment processor charges on top of interchange and assessments. It covers your account, terminals or software, support, and the processor’s profit. This is the only layer you can shop or negotiate, and how it’s calculated depends on the pricing model you sign up for.
How Processors Package the Fee
Processors sell the same underlying costs in different wrappers. The right wrapper depends on your volume, your average sale, and how much bookkeeping you want to do.
Flat-Rate Pricing
A fixed percentage plus a small per-transaction fee applies to every sale, regardless of card type. A typical rate looks like 2.9% + $0.30. You always know what you’ll pay, and a premium rewards card won’t surprise you. The tradeoff is that you overpay on cheaper transactions to subsidize the predictability. It suits small and newer businesses that value simplicity over squeezing the last basis point.
Interchange-Plus Pricing
Interchange-plus itemizes everything. You pay the actual interchange for each card, plus the network’s assessment, plus a fixed markup for the processor. You can see exactly where your money is going and whether the processor’s cut is competitive. Most payment consultants consider this the fairest model for mid-size and larger businesses. It just takes more reconciliation.
Tiered Pricing
Tiered pricing sorts transactions into buckets, usually “qualified,” “mid-qualified,” and “non-qualified,” each with a different rate. Qualified is the cheapest and usually means a basic card swiped in person. Non-qualified is the most expensive and covers premium rewards cards, keyed-in entries, and card-not-present sales. The processor decides which transactions land in which bucket, and the criteria are often vague. A business with lots of online or rewards-card volume can pay far more than the headline “qualified” rate suggests. This is where most merchants get burned if they don’t read the contract.
Bundled Platform Pricing
Platforms like Stripe, Square, and PayPal roll interchange, assessments, and their markup into one published rate. A common online rate is 2.9% + $0.30 per card sale, with slightly different rates for in-person versus online and for standard checkout versus branded checkout.2Stripe. Pricing and Fees3PayPal. Merchant Fees – United States You give up transparency and usually pay slightly more than a well-negotiated interchange-plus deal, but you skip the contract negotiation entirely.
What Pushes the Fee Higher
Two things reliably raise what you pay. Card-not-present sales — online, phone, or keyed-in — cost more than in-person sales at every processor because they carry more fraud risk. If you sell both in a store and online, expect two different rate tiers on your statement.
International transactions cost more too. When the card was issued abroad or the sale needs currency conversion, the network adds a conversion fee of around 1%, and the issuing bank may add another 1% to 2%. Stripe, for example, adds 1.5% for international cards and another 1% when currency conversion is needed.2Stripe. Pricing and Fees For a business selling globally, this belongs in your pricing math from the start.
What You Can Pass to Customers
You have some room to move fees off your books, but the rules are narrower than most people assume.
Minimum purchase amounts. Federal law lets you require a minimum of up to $10 on credit card purchases, which helps when a $2 sale would be eaten by the flat per-transaction fee.1Office of the Law Revision Counsel. 15 USC 1693o-2 – Reasonable Fees and Rules for Payment Card Transactions The minimum has to apply the same way to every credit card brand you accept. It can’t be applied to debit card sales at all.
Credit card surcharges. Adding a surcharge to a credit card sale is legal in most states, capped at 4% of the transaction, and never allowed on debit or prepaid cards.4Visa. Surcharging Credit Cards – Q&A for Merchants You have to disclose the surcharge at the entrance, at the point of sale, and on every receipt. A handful of states ban credit card surcharges outright, including Connecticut, Massachusetts, and Maine, so check your state before you turn one on.
Cash discounts. The other route is a discount for paying with cash, check, or debit. Federal law protects this: card issuers cannot stop you from offering a cash discount, as long as it’s available to every buyer and clearly disclosed.5Office of the Law Revision Counsel. 15 USC 1666f – Inducements to Cardholders by Sellers of Cash Discounts Many merchants prefer this framing because “save 3% with cash” lands better than “pay 3% more with credit,” even though the math is the same.
Refunds and Chargebacks Cost You Twice
When you refund a customer, most processors keep the original transaction fee. You send back the full sale price, but the percentage and per-transaction charge you already paid on the original sale are gone. Even a partial refund cuts into your net by more than the refunded amount.
Chargebacks are worse. If a customer disputes a charge with their bank, you lose the sale amount and get hit with a separate chargeback fee, usually $15 to $50 per incident. Winning the dispute rarely gets that fee back. High chargeback rates can push your processing rates up or get your account terminated. Clean records and fraud-prevention tools matter more than most small businesses treat them.
Fees and Your Taxes
Your Form 1099-K reports the gross volume your processor ran for you, before fees, refunds, or credits are taken out.6Internal Revenue Service. What to Do with Form 1099-K The IRS sees a bigger number than what actually reached your bank account. The processing fees withheld through the year are a separate business expense you have to track and deduct on your return. They qualify as ordinary and necessary business expenses in the year you incur them. For a business running $500,000 in card sales at a 3% blended rate, that’s roughly $15,000 in deductions you’d miss without careful bookkeeping.