01What Does APR Actually Mean?
APR stands for Annual Percentage Rate. It's the yearly cost of borrowing money, expressed as a percentage. But credit card APR is actually calculated and charged daily, not annually. That detail makes a massive difference.
Your credit card company takes your APR and divides it by 365 to get your daily periodic rate. Example: 22.9% APR ÷ 365 = 0.0627% per day. On £5,000 balance, that's £3.14 per day. Over a month: £3.14 × 30 = £94.20 in interest. We pull that daily figure to the front of the dashboard, and explain why statements bury it, in daily interest on credit cards.
That £94.20 is added to your balance every month before you make a payment. If your minimum payment is £150, only £55.80 reduces your debt. The rest goes to interest. That's why minimum payments barely move the balance.
02What Your APR Actually Costs You
Credit card interest compounds daily, so a 10% APR on £5,000 doesn't cost exactly £500 per year. Each day's interest gets added to your balance, and the next day you pay interest on that slightly higher amount. The table below shows what this looks like across common UK APRs.
| APR | Monthly interest (month 1) | Total interest after 1 year | Balance after 1 year |
|---|---|---|---|
| 10% | £41 | £526 | £5,526 |
| 15% | £62 | £809 | £5,809 |
| 20% | £82 | £1,107 | £6,107 |
| 30% | £123 | £1,749 | £6,749 |
Notice the 30% row. You'd owe £1,749 in interest after 12 months, not the £1,500 you might expect. That's compounding. Each month's interest is slightly more than the last because you're paying interest on a growing balance.
£5,000 at 22.9% APR, paying minimums only: 27 years to pay off, £7,062 total interest. You pay £12,062 to clear £5,000 debt.
£5,000 at 22.9% APR, paying £150/month: 46 months (3 years 10 months), £1,886 interest. Total paid: £6,886.
£5,000 at 22.9% APR, paying £250/month: 24 months (2 years), £948 interest. Total paid: £5,948.
That's 25 years and £6,114 in interest saved by paying £250/month instead of minimums.
Those are fixed examples. The credit card payoff calculator uses your own balance and APR, so you can see exactly how long your card takes to clear and what an extra payment a month does to that date.
03How Interest Is Calculated Daily
Day 1: £5,000 balance → £3.14 interest → £5,003.14 new balance
Day 2: £5,003.14 balance → £3.14 interest → £5,006.28
Day 30: £5,094.20 balance → Total interest this month: £94.20
Next month's interest is calculated on £5,094.20. You're paying interest on previous interest. That's compound interest working against you.
Over a year with no payments: Month 1 = £5,094, Month 6 = £5,568, Month 12 = £6,141. That's £1,141 added to your balance without spending a penny.
04Representative APR vs Your Actual APR
When credit cards advertise "19.9% representative APR," only 51% of approved applicants get that rate. Up to 49% get higher rates based on credit score, income, and existing debt.
Example: James applied for a card at 19.9% advertised. His credit score was 650 (fair). He was approved at 27.9% APR. That 8% difference costs £33/month extra in interest on £5,000 balance.
Find your actual APR on your statement. It must be listed in the summary box, interest charges section, or back page terms reminder. If you have multiple cards, they likely all have different APRs.
05UK Credit Card APR Ranges: What's Normal?
Low APR (excellent credit): 9.9%-15.9%. Balance transfer cards: 0% promotional then 22.9%+. Credit score 750+, stable income, low debt required.
Standard APR (most people): 19.9%-24.9%. Credit score 650-750, average income, some existing debt.
High APR (poor/limited credit): 29.9%-34.9%. Credit score below 650, adverse history. Often "credit builder" cards.
Store cards (the worst): 34.9%-39.9%. Example: Argos card = 34.9%. No annual fee, easy approval, but the interest adds up fast at those rates.
Overdrafts: 39.9% (capped since 2020 FCA changes). Before 2020, some charged 40%+.
2026 update: The Bank of England base rate has been easing from its 2024 peak, and the average SVR is now 6.62% (down 0.86pp from a year ago). However, credit card APRs haven't dropped as fast. Lenders pocket the margin. Don't assume your card rate will fall automatically. Also note: BNPL plans with interest (Klarna Financing, PayPal Credit) charge 18.9-23.9%, comparable to credit cards.
06How to Reduce the Impact of High APR
Strategy 1: Pay more than minimum
Calculate: Balance ÷ 24 months = target payment. £6,000 ÷ 24 = £250/month. Debt-free in 28 months, £1,376 interest. Pick a fixed amount higher than minimum and never decrease it.
Strategy 2: Balance transfer to 0% card
With a good enough credit score, moving the balance to a 0% card buys you an interest-free window to clear it. There's usually a fee of around 3%, so it only pays off if you clear the balance before the 0% ends, and you don't spend on the new card. Run your own numbers with the balance transfer calculator.
Strategy 3: Debt consolidation loan (sometimes)
Personal loan at 8-12% replaces cards at 22-29%. Only makes sense if: multiple high-APR debts, qualify for loan APR below 15%, won't run cards back up.
Strategy 4: Use debt snowball method
Pay smallest balance first for psychological wins. Most people who try "highest APR first" give up because it takes 12-18 months to see progress. Snowball gives win in 3-6 months. Difference in interest: £100-300. Not completing plan costs thousands.