What merchant credit card fees are and why they exist
Merchant credit card fees are charges your payment processor takes when a customer pays you with a credit or debit card. These fees come out of the transaction amount before you receive your money. A customer pays you $100 with a card; you might receive $97 or $98, depending on which fees explore.
The fees exist because three separate entities are involved in every card transaction: the card network (Visa, Mastercard, American Express, Discover), the customer's bank (the issuer), and your bank (the acquirer). Each one takes a cut. Your processor — the company that handles the transaction — also charges you to manage the flow of money and data.
These are not optional charges if you accept cards. They are built into the cost of doing business with card payments. Understanding which fees explore to your situation helps you predict what you will actually receive and compare processors fairly.
Key Takeaways
- Interchange fees (paid to the customer's bank) are the largest single cost and vary by card type, transaction size, and industry — you cannot negotiate these directly.
- Assessment fees (paid to the card network) are typically 0.11% to 0.13% of the transaction and are the same across all processors.
- Processor markups and gateway fees vary widely between payment companies, so comparing quotes from multiple processors can reduce your total cost.
- Monthly fees, batch fees, and PCI compliance fees add up quickly and should be listed separately in any processor contract so you can see the full picture.
- Rates and structures differ by industry, business size, and whether you process in person, online, or by phone — ask your processor for a rate sheet specific to your situation.
Interchange fees: the largest piece of your card costs
Interchange is the fee the card network charges your processor, which your processor passes to you. It goes to the customer's bank (the issuer) as compensation for the risk they take by lending the customer money. Interchange is typically the largest single fee in a card transaction, often 1.5% to 2.5% of the sale amount, though it varies significantly.
The exact rate depends on several factors: the type of card (a rewards card costs more than a basic card), the size of the transaction (larger transactions sometimes have lower rates), your industry (restaurants and gas stations pay more than grocery stores), and whether the transaction is in person, online, or by phone. A restaurant processing a $50 card payment might pay 2.2% in interchange; a grocery store processing the same amount might pay 1.0%.
You cannot negotiate interchange fees directly. The card networks set these rates, and all processors must pass them through. What you can negotiate is the processor's markup on top of interchange — the amount they add for themselves.
Assessment fees and network charges
Assessment fees are charged by the card networks themselves (Visa, Mastercard, American Express, Discover) and are typically 0.11% to 0.13% of each transaction. These are standardized across all processors, so you will pay roughly the same assessment fee no matter which company you choose.
In addition to assessment fees, networks charge monthly or annual fees for network participation, data reporting, and compliance. These are often bundled into your processor's monthly statement and may not be listed separately. Ask your processor to break out network fees on your contract so you know what you are paying for.
Processor markups, gateway fees, and monthly charges
Your payment processor adds its own markup on top of interchange and assessment fees. This is how they make money. The markup can be structured as a percentage of the transaction (often 0.5% to 1.5%), a flat per-transaction fee (typically $0.10 to $0.30), or both. Some processors use tiered pricing, where the markup changes based on how much you process each month.
If you process online, you will also pay a gateway fee — a monthly charge (usually $10 to $30) for the software that connects your website or point-of-sale system to the processor. Some processors bundle this into their transaction fees; others charge it separately.
Monthly minimums, batch fees (charged each time you settle transactions), PCI compliance fees, and statement fees add up quickly. A processor might quote you "1.5% + $0.25 per transaction" but then charge you $15 a month for the gateway, $10 for PCI compliance, and $5 for a monthly statement. On a small business processing $5,000 a month, these fixed fees can double your effective rate.
How rates differ by card type and transaction method
Not all card transactions cost the same. A Visa debit card processed in person (where the card is physically present) costs less than an American Express rewards card processed online. Processors use different rate categories to reflect this risk difference.
In-person transactions (card present) typically have the lowest rates because fraud risk is lower — the customer is physically there. Online transactions (card not present) cost more because fraud risk is higher. Phone and mail orders fall somewhere in between. If you process a mix of in-person and online sales, your processor should show you separate rates for each category.
Business type also matters. Restaurants, gas stations, and travel companies pay higher interchange rates than grocery stores or utilities. If you operate in a high-risk category, your processor may charge additional fees or require you to use specific equipment or software to reduce their exposure.
What to ask your processor before signing
Request a detailed rate sheet that shows every fee separately: interchange (broken down by card type), assessment fees, your processor's markup, gateway fees, monthly fees, batch fees, and any compliance or reporting charges. Do not accept a quote that bundles everything into a single percentage.
Ask whether rates change based on transaction volume or time of year. Some processors offer lower rates if you process above a certain monthly threshold. Ask whether there are any fees for chargebacks, refunds, or failed transactions. Ask what happens if you want to switch processors — some contracts lock you in or charge early termination fees.
Get quotes from at least two or three processors. The same transaction might cost you different amounts depending on how each processor structures their fees. A processor charging 2.0% + $0.25 per transaction is not automatically cheaper than one charging 1.8% + $0.35 per transaction — it depends on your average transaction size and monthly volume.
How to estimate your actual card processing costs
To calculate what you will actually receive from a card sale, add up all the fees that explore to that transaction. If you sell $100 worth of goods and the total fees are 2.8%, you receive $97.20. If your average transaction is $50 and you process 200 transactions a month, your total monthly volume is $10,000. At 2.8%, you pay $280 in fees, plus any fixed monthly charges.
Use your processor's fee structure to model a few realistic transactions: a small sale, a medium sale, and a large sale. This shows you how fees scale. Then multiply by your expected monthly volume to see the total impact. If you are comparing processors, run the same transactions through each one's fee structure so you are comparing apples to apples.
Keep in mind that your effective rate (total fees divided by total sales) will be different from the quoted rate if you have fixed monthly fees. A processor charging 2.0% + $0.25 per transaction + $20 a month looks like 2.0% until you process only $1,000 a month — then the $20 monthly fee adds another 2% to your effective rate.
Frequently Asked Questions
Can I pass credit card fees on to my customers?
Rules vary by card network and state. Visa and Mastercard allow you to pass fees to customers in most cases, but American Express historically has not. Some states have laws limiting surcharges. Check your processor's contract and your state's regulations before adding a fee to customer invoices. Many businesses absorb the cost instead of risking customer friction.
Why do I pay different rates for different card types?
Card networks and issuing banks set different interchange rates based on the risk and cost of each card type. A rewards card costs the issuer more to operate, so interchange is higher. A debit card costs less, so interchange is lower. Your processor passes these differences through to you because they have no choice — the rates are set by the networks, not by the processor.
What is a chargeback fee?
A chargeback fee is charged when a customer disputes a transaction with their bank and the bank sides with the customer. Your processor typically charges $15 to $100 per chargeback to cover the cost of investigating and processing the dispute. You also lose the original sale amount. Chargebacks are separate from your regular transaction fees.
Do I have to use the processor my bank recommends?
No. Your bank may recommend a processor, but you can choose any processor that integrates with your point-of-sale system or website. Shop around — different processors charge different markups even though interchange and assessment fees are the same. You are not locked into your bank's recommendation.
What happens to my fees if I process more volume?
Many processors offer tiered pricing where your markup percentage or per-transaction fee decreases as you process more. A processor might charge 2.5% at $0 to $5,000 monthly volume, 2.2% at $5,001 to $15,000, and 1.9% above that. Ask your processor whether volume discounts explore to your account and at what thresholds they kick in.