What a payment processor does and why you need one
A payment processor is the company that moves money from your customer's card or bank account into your business account. When someone pays you by card—in person, online, or over the phone—the processor handles the transaction, checks that the card is valid, and deposits the funds to you, usually within one to three business days. Without a processor, you cannot accept card payments at all.
The processor is different from a payment gateway (the software that encrypts the payment information) and different from your merchant account (the bank account that receives the funds). Some companies bundle all three together; others sell them separately. Understanding what each one does helps you compare pricing and features accurately.
Most small businesses use a processor because card payments now account for the majority of sales. Cash and checks still exist, but customers expect to pay by card, and processors make that possible. The trade-off is that processors charge fees—usually a percentage of each transaction plus a flat fee per transaction, or a monthly subscription, or both.
Key Takeaways
- Payment processors charge either per-transaction fees (a percentage plus a flat amount), monthly subscriptions, or a combination, and the lowest advertised rate is not always the lowest total cost for your business.
- In-person, online, and phone payments often have different fee structures from the same processor, so compare the rate for the method you actually use most.
- Processors that integrate with your point-of-sale system or accounting software can save time on reconciliation, but integration availability varies by processor and by software.
- Interchange fees (set by card networks, not the processor) make up the largest part of what you pay, and no processor can eliminate them, though some disclose them more clearly than others.
- Setup time ranges from same-day to two weeks depending on the processor and whether you need a new merchant account, so plan accordingly if you have a launch date.
Per-transaction fees versus monthly subscriptions
Most small-business processors charge one of two ways: per-transaction or flat-rate monthly. A per-transaction model charges you a percentage of the sale (typically 1.5% to 3.5%) plus a flat amount per transaction (typically $0.20 to $0.30). You pay only for the sales you process, so in a slow month your costs drop. In a busy month they rise. This model works well if your sales are unpredictable or seasonal.
A flat-rate monthly subscription charges you a set amount each month—often $20 to $300 depending on the processor and features—regardless of how many transactions you process. Some also charge a small per-transaction fee on top of the subscription. This model works well if your sales are steady and predictable, because you know your payment costs in advance. If you process very few transactions, a monthly subscription can be expensive per transaction. If you process many, it can be cheaper than per-transaction fees.
Some processors offer both options and let you choose. Others offer tiered pricing: a low monthly fee plus a per-transaction fee that drops as your monthly volume increases. To compare accurately, calculate what you would pay under each model using your actual monthly sales volume and average transaction size. A processor that looks cheap at first glance may not be cheap for your specific business.
Interchange fees and what you actually pay
The largest part of what you pay to accept cards is the interchange fee, which is set by Visa, Mastercard, American Express, and Discover—not by your processor. Interchange is a percentage of the sale, typically 1.3% to 2.2% for debit cards and 1.5% to 3% for credit cards, though it varies by card type and industry. Your processor collects this fee and passes it to the card network.
On top of interchange, your processor adds its own markup, called the processor margin or assessment fee. This is where processors compete on price. A processor might charge interchange plus 0.5%, or interchange plus $0.10 per transaction, or a flat rate that bundles interchange and margin together. The processor margin is what you can negotiate or shop around to reduce. The interchange fee you cannot change.
Some processors disclose interchange and margin separately on your statement; others show only a combined rate. Separate disclosure makes it easier to see what you are actually paying and to compare processors fairly. If a processor does not break down fees on your statement, ask them to provide an example statement before you sign up so you can see the full picture.
In-person, online, and phone payment rates
The same processor often charges different rates depending on how the payment is made. In-person payments (card present, usually with a physical reader) typically have the lowest rates because the processor can verify the card is real and reduce fraud risk. Online payments (card not present) usually cost more because fraud risk is higher. Phone payments (you type in the card number) usually cost the most because there is no physical card to verify and no customer signature.
If you run a retail store, your in-person rate matters most. If you run an online business, your online rate matters most. If you take orders by phone, your phone rate matters most. When comparing processors, look up the rate for the payment method you use most, not the headline rate they advertise. A processor with a 2.2% in-person rate and a 3.5% online rate is not the same as a processor with a flat 2.9% rate across all methods.
Some processors also charge different rates based on the card type: debit cards, credit cards, and rewards cards may each have their own rate. Rewards cards (which cost the merchant more) are common, so ask the processor what percentage of your customers typically use them and what the rate will be.
Integration with your point-of-sale and accounting systems
If you use a point-of-sale system (POS)—software that rings up sales, tracks inventory, and prints receipts—check whether your processor integrates with it. A tight integration means the payment processor and POS talk to each other automatically: when a customer pays, the transaction appears in your POS and your accounting software without you re-entering it. This saves time and reduces errors.
Not all processors integrate with all POS systems. Some integrate with popular systems like Square, Toast, or Shopify but not with smaller or older systems. Some integrate with accounting software like QuickBooks or Xero. Before you choose a processor, confirm that it integrates with the systems you use or plan to use. If it does not, you will have to manually reconcile payments, which takes time and is error-prone.
Integration also affects reporting. A processor that feeds data directly into your accounting software can show you real-time sales and fees. A processor that does not integrate may require you to read a CSV file and import it manually, or to log into a separate dashboard to see your transactions. The more manual work required, the more time you spend on bookkeeping instead of running your business.
Setup time and merchant account requirements
How fast you can start accepting payments depends on the processor and your situation. Some processors, like Square or PayPal, can approve you and set up your account within hours or the same day if you provide basic information online. Others, especially traditional merchant account providers, may take five to fourteen business days because they conduct a more thorough underwriting process.
The underwriting process checks your credit, your business history, and your industry. Some industries—like e-commerce, subscription services, or high-ticket items—are considered higher risk and take longer to approve. If you have been in business for less than two years, approval may take longer. If you have had a merchant account before and closed it due to disputes or chargebacks, some processors will decline you.
A few processors do not require you to open a new merchant account; they deposit funds directly to your existing business bank account. Others require you to open a merchant account with them or with a partner bank. If you already have a merchant account with another processor, switching to a new one may mean opening a second merchant account, which can complicate your banking. Ask the processor upfront whether you need a new account and how long setup takes.
Chargeback and dispute handling
A chargeback occurs when a customer disputes a charge with their card issuer and the card issuer reverses the payment, pulling the money back from your account. This can happen if the customer claims they did not authorize the charge, did not receive the product, or received something different from what they ordered. The processor handles the dispute process, but you bear the cost: you lose the sale, you lose the product (if applicable), and you may pay a chargeback fee (typically $15 to $100 per chargeback).
Different processors have different chargeback policies. Some allow you to dispute a chargeback by providing evidence (like a signed receipt, tracking number, or email confirmation). Others make it harder to fight back. Some processors charge a fee to dispute a chargeback; others do not. If you have a high chargeback rate, some processors will raise your rates or close your account.
Before you choose a processor, ask what their chargeback rate threshold is (the percentage at which they take action), what evidence they accept to dispute a chargeback, and whether they charge a fee to dispute. Also ask whether they offer chargeback protection or insurance, which covers some chargeback losses for an additional fee. This matters most if you sell high-ticket items or if you operate in an industry with naturally higher chargeback rates.
Frequently Asked Questions
Can I use the same processor for in-person and online sales?
Yes, most processors handle both. However, the rates are usually different: in-person is typically cheaper because fraud risk is lower. When comparing processors, confirm the rate for each method separately, because a processor that is cheap for in-person sales may be expensive for online sales, or vice versa.
What happens if my processor goes out of business?
Your funds should still reach your bank account because the processor and your merchant account are separate. However, you will need to set up a new processor to accept future payments. This is why it is worth choosing a processor that has been in business for several years and has a solid reputation, rather than a brand-new startup.
Do I have to sign a contract with a payment processor?
It depends on the processor. Some require a contract with an early termination fee if you cancel before a certain date (often one to three years). Others operate month-to-month with no contract. If you are uncertain about your payment volume or business model, a month-to-month processor gives you more flexibility, though it may charge slightly higher rates.
Can I negotiate the rate my processor charges?
Yes, especially if you process high volume or have been a customer for a long time. Processors often have room to lower their margin (the part they add on top of interchange). Call your processor and ask if they can reduce your rate. If they refuse, getting a quote from a competitor and showing it to them sometimes prompts them to match or beat it.
What is the difference between a payment processor and a payment gateway?
A payment gateway is the software that encrypts your customer's card information and sends it securely to the processor. The processor then handles the actual transaction and deposits the funds to your account. Some companies provide both; others specialize in one or the other. You need both to accept online payments.