Credit card interest explained: APR, minimum payments and clearing a balance faster

Published 4 July 2026 · 5 min read

Credit cards are convenient, but the interest can be punishing if you carry a balance. Understanding three things — APR, how minimum payments work, and how interest compounds — makes the cost visible and shows you how to clear a balance far faster.

What APR actually means

APR (Annual Percentage Rate) is the yearly cost of borrowing, including interest and certain compulsory fees. A typical purchase APR might be somewhere around 20–35%. Crucially, if you pay your statement balance in full each month, most cards charge no interest on purchases at all — the APR only bites when you carry a balance from one month to the next.

Why paying only the minimum is a trap

The minimum payment is usually a small percentage of the balance (often around 1% plus that month's interest). Because it's calculated as a percentage, it shrinks as the balance falls, so the debt clears agonisingly slowly. On a mid-size balance at a typical APR, paying only the minimum can take well over a decade and cost more in interest than the original spending. Paying a fixed amount each month — rather than the shrinking minimum — dramatically shortens that.

Two strategies that clear debt fastest

If you have more than one card or debt, two well-known methods help you attack them in order:

Avalanche: pay minimums on everything, then throw every spare pound at the debt with the highest interest rate. This costs the least in total interest.
Snowball: pay minimums on everything, then clear the smallest balance first. It costs slightly more in interest but gives quick wins that keep you motivated.

Both work; the best one is the one you'll stick to. A 0% balance-transfer card can also help by pausing interest for a set period — just check the transfer fee and the date the 0% ends.

See the numbers before you decide

Whether you're weighing a personal loan to consolidate, or working out how quickly extra payments clear a balance, put real numbers in first. Seeing the total interest is usually the nudge that changes behaviour.

Work out repayments and total interest: Loan Repayment Calculator.

This article is general information, not financial or debt advice. If you are struggling with debt, free help is available from services such as StepChange, National Debtline and Citizens Advice. Always check terms with your provider before making decisions.