Payment processors earn money by taking a cut of each transaction they handle
When you swipe a card or send money online, a payment processor sits in the middle and moves the money from your bank to the merchant's bank. They charge for this service—usually a percentage of the transaction amount, a flat fee per transaction, or both. The processor keeps some of this fee and passes the rest along to the card networks (Visa, Mastercard) and the banks involved. This is how they stay in business.
The exact amount varies wildly depending on the type of transaction, the merchant's size, and the payment method used. A small business paying for a card reader might pay 2.9% plus 30 cents per transaction. A large retailer with negotiating power might pay 1.5% plus 15 cents. A wire transfer or ACH payment has different fees entirely. Understanding these layers helps explain why some payment methods cost merchants more than others—and why merchants sometimes push you toward cheaper options.
Key Takeaways
- Payment processors charge merchants a percentage of the transaction amount, a per-transaction fee, or both, and keep a portion while passing fees to card networks and banks.
- Interchange fees—set by Visa and Mastercard—are the largest cost for card transactions and go directly to the cardholder's bank, not the processor.
- Different payment methods have different fee structures: credit cards cost more than debit cards, which cost more than ACH transfers or wire transfers.
- Processors also make money from monthly subscriptions, gateway fees, chargeback disputes, and premium features like fraud detection or reporting tools.
- The fees merchants pay ultimately come from the prices you see in stores and online, since businesses factor payment costs into their pricing.
The three layers of fees in a card transaction
When you pay with a credit or debit card, the money doesn't move directly from your bank to the store. It passes through at least three separate entities, each taking a fee. The payment processor is one of them, but not the only one.
The largest fee is the interchange fee, set by Visa or Mastercard and paid to your bank (the issuer). This fee typically ranges from 1% to 3% of the transaction amount, depending on the card type and merchant category. A rewards credit card at a grocery store might trigger a 2.2% interchange fee. A basic debit card at the same store might be 0.05%. The processor does not set this fee and does not keep it—it goes straight to your bank as compensation for the risk of issuing credit.
On top of interchange, there is an assessment fee paid to the card network itself (Visa, Mastercard, American Express). This is typically 0.1% to 0.15% of the transaction and covers the network's cost to operate the system. The processor collects this and passes it along.
Finally, the processor's markup is what the processor actually keeps. This is where they make their profit. For a small merchant, this might be 0.5% to 1% of the transaction. For a large chain, it might be 0.2% to 0.5%. The processor also charges a flat per-transaction fee—often 20 to 30 cents—which they keep entirely.
Why different payment methods have different costs
Credit cards cost merchants more than debit cards, which cost more than bank transfers. This is because each method carries different risk and processing overhead.
Credit card transactions have the highest interchange fees because the card issuer is extending credit to the cardholder and absorbing the risk of non-payment. The processor must also handle chargebacks—disputes where the cardholder claims they didn't make the purchase or received a defective product. Chargebacks are expensive to process and investigate, so processors build this cost into their fees.
Debit card transactions have lower interchange fees because there is no credit risk—the money comes directly from the cardholder's account. The processor still handles disputes, but they are less common and less costly.
ACH transfers (the system banks use to move money between accounts) have flat fees rather than percentage-based fees. A processor might charge $0.25 to $1.50 per ACH transaction, regardless of the amount. This makes ACH cheap for large transfers but expensive for small ones. Wire transfers have similar flat-fee structures, often $15 to $30 per wire, and the processor keeps a portion of that.
Digital wallets like Apple Pay and Google Pay typically use the same interchange and assessment fees as the underlying card, so they do not change the processor's revenue—but they do reduce the processor's fraud risk because the wallet provider handles authentication.
Monthly fees and subscription revenue
Beyond per-transaction fees, processors make money from merchants through monthly subscriptions and account maintenance charges. A small business using a payment gateway (the software that connects a website to the processor) might pay $10 to $30 per month just to maintain the account. Larger merchants with custom setups or high transaction volumes might pay hundreds or thousands per month.
Processors also charge for premium features: fraud detection tools, advanced reporting dashboards, PCI compliance support, and integration with accounting software. A merchant who wants real-time alerts for suspicious transactions or detailed sales analytics pays extra for these services. These fees are where processors can differentiate themselves from competitors and increase revenue without raising per-transaction rates.
Some processors offer tiered pricing: a basic plan with limited features and higher per-transaction fees, and a premium plan with lower per-transaction fees but higher monthly costs. This lets merchants choose based on their volume and needs.
Chargeback fees and dispute resolution
When a customer disputes a charge—claiming fraud, non-delivery, or a billing error—the processor must investigate and potentially reverse the transaction. This process costs money: staff time, communication with the merchant and cardholder, documentation review, and potential loss if the chargeback is upheld.
Processors charge merchants a fee for each chargeback they handle, typically $15 to $100 depending on the processor and the complexity of the dispute. If a merchant has a high chargeback rate (more than 1% of transactions), the processor may charge even higher fees or terminate the account entirely. This creates an incentive for merchants to prevent fraud and resolve customer complaints quickly—which also benefits the processor by reducing their own costs.
Some processors offer chargeback protection services for an additional monthly fee, where they help merchants fight invalid chargebacks or provide insurance against losses. This is another revenue stream.
How payment processors compete on fees
Processors compete primarily on cost, but also on speed, reliability, and features. A processor serving restaurants might specialize in point-of-sale systems and offer lower fees for in-person card transactions. A processor serving online retailers might focus on fraud detection and offer lower fees for e-commerce. A processor serving nonprofits might offer reduced rates as a loss leader to build market share.
Large merchants have negotiating power and can demand lower rates. Visa and Mastercard set interchange fees, but processors can negotiate their assessment fees and markups. A big-box retailer processing millions of dollars per month might pay 1.5% total instead of 3%, because the processor's profit on volume makes up for the lower margin.
Small merchants have little negotiating power and typically pay the highest rates. This is why small businesses often use payment processors that specialize in their industry—a local restaurant using Toast or Square might pay less than using a generic processor, because the processor has built features and pricing specifically for restaurants.
Where the money goes: the full breakdown
On a $100 credit card transaction at a typical small business, here is roughly where the fees go:
| Fee Type | Amount | Recipient |
|---|---|---|
| Interchange fee | $2.00 | Cardholder's bank |
| Assessment fee | $0.12 | Visa or Mastercard |
| Processor markup | $0.75 | Payment processor |
| Per-transaction fee | $0.30 | Payment processor |
| Total cost to merchant | $3.17 | — |
The processor keeps $1.05 of the $3.17 total fee. The rest goes to the cardholder's bank and the card network. This is why processors focus on volume—they make money on the number of transactions, not the size of each one. Processing 10,000 small transactions is more profitable than processing 100 large ones, even if the dollar volume is the same.
Why merchants pass these costs to you
Payment processing fees are a real business expense, and merchants factor them into their prices. A coffee shop paying 2.9% plus 30 cents per card transaction will charge slightly higher prices to cover that cost. An online retailer paying 3% in fees will build that into their product prices or shipping costs.
This is why some merchants offer discounts for cash or check payments—they are trying to avoid the processor's fee. It is also why some merchants set minimum purchase amounts for card transactions or charge a surcharge for credit cards (where legal). They are trying to offset the processor's cost.
As a customer, you do not pay the processor directly, but you pay indirectly through higher prices. The more transactions a business processes, the more they spend on fees, and the more they need to charge to stay profitable.
Frequently Asked Questions
Do payment processors make money from wire transfers and ACH payments?
Yes, but differently. Instead of a percentage fee, processors charge a flat fee per transaction—typically $0.25 to $1.50 for ACH and $15 to $30 for wire transfers. The processor keeps a portion and passes the rest to the banks involved. Wire transfers are more profitable per transaction because the fees are higher, but ACH is more profitable overall because the volume is much larger.
Why do credit cards cost more than debit cards?
Credit card issuers set higher interchange fees because they are extending credit to the cardholder and absorbing the risk of non-payment. Debit cards pull money directly from an account with no credit risk, so the interchange fee is much lower. Processors pass these costs along to merchants, making credit card transactions more expensive to process.
Can a processor charge whatever fees they want?
No. Visa and Mastercard set interchange and assessment fees, which processors cannot change. Processors can only negotiate their own markup and per-transaction fees with merchants. Large merchants can negotiate lower rates because they process high volume. Small merchants typically pay standard rates because they have little bargaining power.
Do payment processors make money from failed transactions?
Usually not. If a transaction is declined (insufficient funds, expired card, fraud block), the processor typically does not charge a fee because no money moved. However, some processors charge a small fee for declined transactions, especially if the merchant uses a premium fraud detection service that screened the transaction.
What happens to the processor's revenue if I use a digital wallet?
The processor's revenue stays roughly the same. Apple Pay and Google Pay use the same underlying card and the same interchange and assessment fees. The processor does not see a difference in their cut. However, digital wallets reduce fraud risk for the processor because the wallet provider handles authentication, which can lower the processor's chargeback costs.