Transaction fees
Most providers charge a percentage of each sale. Check whether the rate differs for in-person, online and keyed-in payments, and for cards issued outside the EEA or business cards, as these are often charged more.
Fixed fees per transaction
Some rates add a fixed amount, such as a few cent, to every payment. On small sales this can cost more than the percentage itself, so it matters most for cafés, market stalls and other low-value, high-volume businesses.
Monthly charges
Look for subscription plans, minimum monthly fees, PCI compliance charges or software add-ons. A monthly plan with a lower rate can pay off at higher volumes and cost more at lower ones.
Terminal purchase or rental
Buying a reader outright is usually a one-off cost. Renting spreads the cost but continues for as long as the agreement runs. Work out the total over two or three years, not just the upfront price.
Contract length
Some providers work on a pay-as-you-go basis that you can stop at any time. Others, particularly for rented terminals, have minimum terms and exit fees. Read the cancellation terms before you sign.
Payout speed
Check how many working days it takes for card takings to reach your bank account, whether weekends count, and whether faster or instant payouts cost extra. This has a direct effect on cash flow.
Refunds and chargebacks
Find out whether the original fee is returned when you refund a customer, and what the provider charges when a customer disputes a payment. Businesses taking payments online or in advance tend to see more disputes.
In-person and online needs
If you sell both at a counter and online, a single provider can combine your sales, reporting and payouts in one place. If you only do one, you may not need to pay for tools built for the other.
Integrations
Check that the provider works with your website platform, booking system, till or point-of-sale software, and accounting package. A good integration saves hours of manual reconciliation.
Reporting
Clear daily reports that match payouts to individual sales make bookkeeping and VAT returns easier. Check which reports are included and whether you can export them.
Customer support
A terminal fault on a busy Saturday costs sales. Check which support channels are offered, their opening hours, and how quickly faulty hardware is replaced.
PCI and security
Check whether the provider handles PCI requirements, what security standards are built in, and whether there are any extra compliance costs or actions for your business.