Credit cards are one of the most widely used financial products in the UK, and one of the most misunderstood. Used carefully, they offer genuine benefits — consumer protection, interest-free spending, rewards and the ability to build a credit history. Used carelessly, they can lead to expensive, compounding debt.
This guide explains how credit cards work in plain English, covering interest, minimum payments, credit limits, and your legal rights as a cardholder.
What is a credit card?
A credit card is a payment card linked to a revolving credit facility. When you use it, you are borrowing money from the card issuer up to an agreed credit limit. At the end of each billing cycle (typically monthly), you receive a statement showing what you have spent. You then have a choice: pay off the full balance, pay more than the minimum, or pay only the minimum amount required.
Interest and APR
If you do not pay off your full balance each month, you will be charged interest on the remaining amount. The interest rate on credit cards is expressed as an Annual Percentage Rate (APR). UK credit card APRs typically range from around 20% to 60% or more for specialist cards, with the representative APR (the rate that at least 51% of accepted applicants receive) stated in any advertisement.
At a 30% APR, a balance of £1,000 that you never pay off would cost around £300 in interest over a year — and significantly more over multiple years as interest compounds. This is why carrying a balance on a credit card is generally considered one of the most expensive forms of borrowing.
Importantly, if you pay your full statement balance every month by the due date, you typically pay no interest at all. This is because most credit cards offer an interest-free period — usually 25 to 56 days — between purchase and the payment due date.
Minimum payments
Each month, you must pay at least the minimum amount shown on your statement. This is typically 1–2% of your outstanding balance, or a fixed minimum (often £25 or similar), whichever is higher.
Paying only the minimum keeps you compliant with your credit agreement but is expensive. If you have a balance of £2,000 on a card charging 25% APR and pay only the minimum each month, it can take many years to clear the debt and cost significantly more than the original balance in interest. Your credit card statement is required by law to show how long it would take to clear your balance paying only the minimum, and how much interest you would pay — check this figure on your next statement.
Credit limits
Your credit limit is the maximum amount you can owe on the card at any one time. Limits are set by the card issuer based on your income, credit history and other factors. They can be increased or decreased over time.
Using a high proportion of your credit limit — for example, owing £950 on a card with a £1,000 limit — can negatively affect your credit score through high credit utilisation. As a general guide, keeping utilisation below 30% of your limit is beneficial for your credit score.
Section 75 protection
One of the most significant benefits of credit cards in the UK is Section 75 of the Consumer Credit Act 1974. Under this legislation, if you buy goods or services costing between £100 and £30,000 on a credit card and the purchase goes wrong — the company goes bust, the goods are not delivered, or they are significantly different from what was described — the card issuer is equally liable alongside the retailer.
This means you can claim a refund from your card issuer even if the retailer has ceased trading or refuses to help. Section 75 applies to the full value of the purchase if the credit card was used to pay even part of the cost (for example, paying a £10 deposit on a £500 item). This protection does not apply to debit cards or to purchases made via third-party payment services such as PayPal.
Types of credit card
0% purchase cards
These offer an interest-free period on new purchases — typically six to 24 months. Useful for spreading the cost of a large purchase without paying interest, provided you clear the balance before the 0% period ends (after which the standard rate applies).
0% balance transfer cards
Allow you to transfer existing credit card debt from another card and pay no interest for a set period. A transfer fee is usually charged (typically 1–3% of the amount transferred). Useful for reducing the cost of existing debt.
Rewards and cashback cards
Offer points, air miles or cashback on spending. These are only financially beneficial if you pay your balance in full each month — otherwise interest costs outweigh any rewards earned.
Credit builder cards
Designed for people with limited or poor credit history. They typically carry lower credit limits and higher interest rates, but used responsibly — spending a small amount and paying in full each month — they can help build a credit history.
Using a credit card responsibly
The core principle of responsible credit card use is simple: spend only what you can afford to repay in full, and pay the full balance every month. Set up a direct debit for the full statement balance so you never miss a payment. Check your statement each month to catch any fraudulent transactions promptly.
If you are struggling with credit card debt, free advice is available from StepChange (stepchange.org) and National Debtline (nationaldebtline.org).