What a credit card terminal does and who needs one
A credit card terminal is a device that reads a customer's card, sends the information to the card network (Visa, Mastercard, American Express), and confirms whether the transaction goes through. If you take card payments in person — at a retail counter, a market stall, a salon, a service call — you need a terminal or a mobile reader that does the same job.
The terminal itself is just the hardware. Behind it sits a merchant account (a bank account that receives card payments), a payment processor (the company that handles the transaction), and a gateway (the software that connects your terminal to the processor). You do not need to understand all these pieces, but you do need to know that you are paying fees to multiple parties, and those fees vary widely depending on which terminal you choose and how you set it up.
If you only take payments online or over the phone, you do not need a physical terminal — you use a virtual gateway instead. This article covers in-person terminals only.
Key Takeaways
- A credit card terminal reads the card and sends the information to the payment processor, which charges you a fee for each transaction.
- You pay three types of fees: a percentage of each sale (interchange), a flat per-transaction fee, and sometimes a monthly terminal rental or subscription.
- Interchange rates are set by the card networks and do not change based on which processor you use, but the per-transaction fee and markup vary widely.
- Choosing between a leased terminal, a purchased terminal, or a mobile reader depends on your sales volume, the type of business you run, and how long you plan to stay in business.
- Your contract terms matter as much as the fees — some terminals lock you in for years, while others let you cancel month to month.
The three fees you pay on every card transaction
Interchange is the largest fee and goes to the card issuer (the customer's bank). Visa and Mastercard set these rates, and they vary by card type, industry, and whether the card is present or not. A rewards card costs more to process than a basic card. A restaurant pays a different rate than a gas station. You cannot negotiate interchange — it is the same whether you use Square, Stripe, or a traditional processor.
The per-transaction fee goes to your processor and is where you see the biggest differences between providers. This might be $0.10, $0.30, or higher per transaction, and it stacks on top of the interchange percentage. A processor might advertise "2.6% + $0.10" — that means 2.6% of the sale plus a dime per card.
The monthly fee depends on your setup. If you lease a terminal from your processor, you pay a rental fee (often $20 to $50 per month). If you buy your own terminal and use a processor that supports it, you may pay a flat monthly subscription instead, or no monthly fee at all. Some processors charge a monthly minimum if your sales are below a certain amount.
Leased terminals versus purchased terminals versus mobile readers
A leased terminal comes from your processor. You pay a monthly rental, usually $25 to $50, and the processor handles repairs and updates. The downside is that you are locked into a contract — often two or three years — and if you want to switch processors, you have to return the terminal or keep paying rent on it. Leasing makes sense if you are just starting out and do not want to buy equipment, but the rental adds up fast over time.
A purchased terminal costs $300 to $1,500 upfront, depending on the model and features. Once you own it, you can use it with any processor that supports that terminal type (most modern processors do). You own the equipment, so you can take it with you if you change processors. The trade-off is the upfront cost and the fact that you are responsible for repairs after the warranty ends. Buying makes sense if you plan to stay in business for several years or if you think you might switch processors.
Mobile readers are small devices that plug into a smartphone or tablet. Square Reader, PayPal Zettle, and Clover Go are common examples. They cost $20 to $100 and work with the company's own payment app. Mobile readers are cheapest upfront and easiest to set up, but they are slower than countertop terminals and work only with that company's processor — you cannot switch without buying a new reader. They work well for small businesses, pop-up vendors, and service providers who move between locations.
How to compare processors and avoid long-term contracts
The advertised rate (like "2.6% + $0.10") is only part of the picture. Ask each processor for a sample statement showing what you would actually pay on a typical day of sales. The statement shows the interchange breakdown, the per-transaction fees, and any other charges. This is the only way to see the real cost, because processors bundle fees differently and the advertised rate often leaves out the monthly minimum or the gateway fee.
Before you sign, read the contract for the cancellation terms. Some processors let you cancel month to month with 30 days' notice. Others lock you in for two years and charge an early termination fee of $200 to $500 if you leave. If you lease a terminal, the contract usually says you have to return it or keep paying rent even after you cancel the processing agreement. A month-to-month contract costs slightly more per transaction, but it gives you the freedom to switch if the processor's service is poor or if you find a better rate.
Check whether the processor charges a PCI compliance fee (usually $10 to $25 per month). This is a fee for maintaining security standards, and some processors include it in their base rate while others charge it separately. It is not optional — you have to pay it somewhere — but knowing about it upfront prevents surprises on your first bill.
What happens when a card is declined or a customer disputes a charge
When a card is declined, the terminal shows an error code and the transaction does not go through. The customer can try a different card or payment method. You do not pay a fee for a declined transaction, but you also do not get paid. If the customer leaves without paying, you have lost the sale.
When a customer disputes a charge (also called a chargeback), the card issuer investigates and may reverse the payment. The processor charges you a chargeback fee (usually $15 to $100) whether you win the dispute or not. If you lose, you refund the customer and pay the fee. To reduce chargebacks, keep receipts, get signatures or PIN confirmations, and respond quickly to disputes with proof of the transaction.
Some processors offer chargeback protection or fraud detection tools, but these usually cost extra or are only available on higher-tier plans. For most small businesses, the standard fraud protection built into the terminal is enough.
Frequently Asked Questions
Can I use the same terminal with different payment processors?
It depends on the terminal. If you own a standard countertop terminal (like an Ingenico or Verifone), most modern processors support it and you can switch. If you lease a terminal from your processor or use a mobile reader tied to one company's app, you cannot use it with another processor without buying new equipment.
What is the difference between a PIN pad and a card reader?
A PIN pad is a small keypad where the customer enters their PIN for a debit card. A card reader is the part that swipes, inserts, or taps the card. Most modern terminals combine both in one device. Some mobile readers do not have a PIN pad and rely on the phone's screen instead.
Do I have to accept all card types?
No. You can choose to accept only Visa and Mastercard, for example, and decline American Express or Discover. However, most customers expect you to take the major cards, and refusing payment methods costs you sales. The fee difference between card types is usually small enough that it does not make sense to turn away customers.
What if I process very few transactions per month?
Some processors charge a monthly minimum (often $20 to $30) even if your sales are lower. Others waive the minimum for very small businesses. Mobile readers and pay-as-you-go processors are usually cheaper for low-volume sellers because you only pay per transaction with no monthly fee.
How do I know if I am being overcharged?
Compare your processor's rates to what other businesses in your industry pay. Industry groups and small business associations often publish average rates. Request a sample statement from a competitor's processor and compare the total cost on the same sales volume. If your rate is significantly higher, ask your processor to match it or consider switching.