How do credit cards work?
Written byEmily Tye
Updated:Mar 20, 2026
5 min read
A credit card is a financial product that lets you borrow money from a bank or credit card provider to make purchases or pay bills. Instead of using your own funds, you use the bank’s money (up to a predetermined limit) and repay later, either in full or in instalments.
Credit cards are a powerful financial tool when used responsibly. They can provide convenience, help you build your credit score, and even offer rewards. Though there are a few different types of credit card, they all fundamentally work in the same way, with the same key components:
Credit limit: This is the maximum amount you can borrow on your credit card. For example, if your limit is £2,000, you can spend up to that amount. If you try to exceed it, your transaction may be declined, or you might even face an over-limit fee.
Billing cycle: This is the period of time during which your purchases are tracked (usually 30 days).
Grace period: This is the time you have to pay your balance in full without incurring interest.
Interest rate: This is the cost, expressed as a percentage, you pay for borrowing money when you do not pay your full balance by the due date.
APR: This is the total cost of borrowing on a credit card, including interest and fees, expressed as a yearly percentage.
Minimum payment: This is the smallest amount you must pay each month to avoid further penalties.
When you use a credit card, you are essentially borrowing money from the credit card provider, up to your established credit limit. Each time you make a purchase, the amount is added to your credit card balance. At the end of the billing cycle, you will receive a credit card statement showing how much you owe and a due date. You can either:
Pay the total amount due within the grace period to avoid interest charges. In this scenario, you borrowed money for free - nice!
Pay the minimum payment (usually a percentage of your balance) to keep your account in good standing. However, you will be charged the interest rate on the remaining balance.
Pay more than the minimum payment but less than the total balance. This reduces the amount of interest you owe, but you will still be charged interest on the remaining balance.
Discover more about how credit cards work below.
These articles are for informational purposes only and does not constitute financial advice. Please speak to a qualified financial adviser before making financial decisions.
