How much interest will I pay on my credit card?

How much interest you pay depends on your balance, the interest rate applied to it and how quickly you repay it. New spending, fees and promotional rates can also change the total.

To estimate your interest, start with the purchase interest rate on your latest statement. Your provider’s daily or monthly rate is more useful for this calculation than simply dividing the advertised APR by 12.

As a simplified example, a £2,000 balance charged at 2% per month would incur £40 of interest in the first month, before allowing for payments or new spending. This is an illustration, not an exact calculation for a card advertised at 24% APR.

If you pay your statement balance in full and on time, you can usually avoid interest on standard purchases, subject to your card’s terms. Cash withdrawals, balance transfers and promotional balances can follow different rules.

How to calculate credit-card interest

For an estimate of your own interest charge, check your statement for the rate that applies to your purchase balance. If your provider gives a daily rate, multiply each day’s outstanding balance by that rate, then add the daily charges for the statement period. Convert a percentage to a decimal before multiplying. For example, 0.05% becomes 0.0005. Your provider’s terms explain the exact calculation.

To show how repayments affect the total cost, the examples below use a simplified monthly model: a £2,000 starting balance, interest charged at 2% each month before the payment, no fees and no new spending. This monthly rate is an illustrative assumption, not an exact conversion of 24% APR.

The final payment is smaller than the regular payment in each example.

In the first month, £40 of interest is added to the £2,000 balance. A £100 payment then reduces the balance to £1,940. The following month’s interest is £38.80, because the balance is smaller.

Paying £200 rather than £100 each month clears this example balance 14 months sooner and saves approximately £326 in interest. Actual results depend on your card’s rate, transaction dates and repayment timing.

What happens if I keep spending while repaying?

New spending can slow repayment considerably, even when you make the same payment every month.

With a £2,000 starting balance and interest charged at 2% monthly, paying £100 a month with no new spending clears the balance in 26 months, with approximately £580 in interest.

If you add £50 of new spending every month while continuing to pay £100, repayment takes approximately 82 months (almost seven years) and total interest rises to about £2,064.

This illustration adds interest to the opening balance, then £50 of spending, then deducts the payment each month. It assumes no fees or rate changes and a smaller final payment. Your card’s actual calculation and transaction timing will differ.

In the first month, £40 of interest and £50 of spending are added before the £100 payment. The balance falls by just £10, from £2,000 to £1,990.

That is why it helps to look at repayments alongside everyday spending. If groceries, fuel or bills keep going onto the card, part of each repayment is covering new borrowing rather than reducing the existing debt.

Comparing your income, spending and repayments can help you understand whether the balance is falling, and whether your monthly budget depends on continuing to borrow.

Why minimum payments can keep the balance around for years

The minimum payment on your statement is the smallest amount required under the agreement. It is not designed to tell you what repayment would make sense for your wider finances.

rFo credit-card agreements made on or after 1 April 2011, FCA rules generally require minimum repayments to cover interest, fees and charges plus 1% of the outstanding balance. Providers can require more.

Because minimum payments often fall as the balance falls, paying only the minimum can make repayment extremely slow. MoneyHelper illustrates how a £2,000 balance on a typical credit card could take 14 years to clear with minimum payments.

There is a reason regulators pay attention to this. If, over an 18-month period, more money has gone towards interest, fees and charges than towards reducing the amount borrowed, FCA rules class the account as being in persistent debt and require the provider to intervene.

For someone looking at a statement, that definition gives the interest figure more meaning. The concern is not merely that interest exists. It is whether the balance is reducing at a meaningful pace relative to the amount being paid.

See how your credit card fits into your wider finances

Understanding the interest is one part of the picture. The next question is whether your income and everyday spending leave enough room to reduce the balance.

MoneyAngel is designed to help you see how debt repayments fit into your wider financial picture.

See how MoneyAngel works

Your statement contains most of the information you need

Start with your latest credit-card statement. Look for:

• • Your outstanding balance.
  • The interest rate applying to purchases.
  • Any separate rates for balance transfers or cash withdrawals.
  • The interest charged during the statement period.
  • Your minimum payment and payment due date.
  • When any promotional rate ends.

Use these details rather than relying on the advertised APR from when you applied. If you cannot find the applicable rate, check your card agreement or ask your provider.

Next, compare your payments with your new spending. If you have repaid £300 but added £280 in purchases, you have reduced what you owe by only £20 before interest and fees.

When using a repayment calculator, check whether it allows for continued spending. An estimate that assumes no new purchases will not reflect your situation if you keep using the card for groceries, bills or other costs.

Looking at your statement alongside your monthly budget helps you understand both what the borrowing costs and what is keeping the balance from falling.

Understand what is keeping your balance from falling

Your interest rate matters, but so do your repayments and any new spending. Looking at all three helps explain why your balance is falling quickly, slowly or barely at all.

Start by comparing your last few statements. How much interest was added? How much did you repay? How much new spending went onto the card? Then consider whether your monthly budget leaves room for the repayment you want to make.

MoneyAngel helps you see how debt repayments fit into your wider financial picture. Explore how it works and whether it could help you understand your next steps.