Credit Card Payoff Calculator United Kingdom

This credit card payoff calculator shows when a UK card clears at a fixed monthly payment, what the interest costs and how the FCA persistent debt rules apply.

Credit Card Payoff Calculator United Kingdom
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Months to clear the balance —
Total interest paid —
Total amount paid —

We always strive to use the latest data for every variable so our results and reports are as accurate as possible. Even so, errors are possible — you should not rely on this tool or its report alone, and we accept no liability for any decision made based on it.

What it does

The Credit Card Payoff Calculator shows how long it takes to clear a credit-card balance at a fixed monthly payment, and how much interest you will pay along the way. It also warns you when a payment is too small to ever clear the debt.

Data sources & parameters

This calculator uses standard financial formulas and runs entirely in your browser. It needs no external rate data — your result is computed only from the values you enter above.

We always strive to use the latest data for every variable so our results and reports are as accurate as possible. Even so, errors are possible — you should not rely on this tool or its report alone, and we accept no liability for any decision made based on it.

The formula

monthly rate i = APR ÷ 12; each month: balance = balance + balance × i − payment, repeated until balance = 0; total interest = sum of the monthly interest charges

How it works

It simulates your balance month by month: each month interest is added at your card's monthly rate, your payment is subtracted, and the balance rolls forward. It repeats until the balance reaches zero, counting the months and totalling the interest.

Where it is used

  • Planning how fast a fixed payment clears a card
  • Seeing the true interest cost of paying only a small amount
  • Checking whether your payment is above the interest-only trap

Worked example

Clearing a £3,000.00 balance at 24% APR by paying £150.00 a month takes … months and costs … in interest, for a total of ….

A card balance can feel stuck because interest is added before your payment is credited. On a £3,000 balance at 24%, the first £60 of each month’s payment covers interest before any of it reduces the debt. Enter your balance, your APR and a payment you can keep up, and this calculator shows the month the card clears, what the interest costs and whether the payment is large enough to make progress.

How the projection is built

The model runs one loop per month: add the month’s interest to the balance, subtract your payment and carry the remainder forward, until the balance reaches zero. It counts the months and totals the interest as it goes.

Because interest is applied before the payment, the share of each payment that reduces the debt starts small and grows every month. Progress in the first year always looks worse than progress in the last, which is when many people give up on a payoff plan.

Turning an APR into a monthly charge

The calculator divides the APR by twelve. At 24% that is 2% a month, so £3,000 attracts £60 in the first month. Pay £150 and £90 comes off the balance. As the balance falls, so does the interest, and the final payments clear much more debt than the first ones.

Use the rate that actually applies. UK cards often carry several: purchases at the headline rate, cash withdrawals at a higher rate with a fee and no interest-free period, and balance transfers at a promotional rate. A representative APR only has to be the rate that at least 51% of customers taking the card because of the advert receive; others can be charged more. The rate on your own statement is the one to use.

The persistent debt rules and what they trigger

The FCA requires card providers to check whether you are making progress, not just whether you are paying. Under its persistent debt rules (CONC 6.7.27R onwards), if over 18 months you have paid more in interest, fees and charges than you have repaid of the balance, the provider must contact you, explain that paying more would reduce the cost and point you to free debt advice. If the pattern continues for another 18 months, the provider must offer ways to repay the balance in a reasonable period, typically three to four years, and if you do not respond it can suspend or cancel the card.

If your projected payoff is measured in decades, those rules were written for your situation. Setting a payment you can hold is the way to stay ahead of them.

Why a fixed payment beats a minimum payment

A UK card minimum is usually the month’s interest, fees and charges plus a small percentage of the balance, with a floor. As the balance falls, the minimum falls too, so the debt lasts longer and interest keeps building on what remains. That is the pattern the persistent debt rules aim to break.

A fixed payment stays flat while the interest portion shrinks, so a growing share of each payment goes to the balance. The same money in month one does much more work by month twenty.

Balance transfers, fees and the reversion date

A 0% balance transfer is the most effective single step available in the UK market, and the two things that undermine it can both be avoided.

The first is the transfer fee, charged once as a percentage of the amount moved. Weigh it against the interest it saves: with a short promotional period and a small balance, the fee can exceed the saving.

The second is the reversion date. The 0% period ends on a fixed day whether or not the balance is cleared, and the standard rate that returns is usually high. Divide the balance by the number of promotional months, pay at least that each month and treat the end date as a deadline. Payments are allocated to the highest-rate balance first, so new spending on a card carrying a 0% transfer will be charged interest while the transferred balance sits at 0%.

A £3,000 balance at 24 per cent

Pay a flat £150 a month. The first month adds £60 of interest, so the balance falls to £2,910. The card clears in 26 months and costs about £870 in interest.

Pay £250 a month and the card clears in 14 months, with about £465 of interest. The extra £100 a month nearly halves both the time and the cost. Paying only a minimum that shrinks with the balance can stretch a £3,000 debt past a decade and cost more in interest than the original spending.

The protection you keep by not closing the card

Once the balance is clear, there is a case for keeping the account open and unused. Section 75 of the Consumer Credit Act 1974 makes the card provider jointly liable with the retailer for breach of contract or misrepresentation on goods or services with a cash price over £100 and up to £30,000. If a company takes your money and fails to deliver, or goes bust, your card provider is liable alongside it. The protection covers credit card purchases, not debit card ones, and does not depend on carrying a balance. Paying for a holiday or a sofa on the card and clearing it in full the same month is a sensible habit.

Where the projection stops being accurate

This is a planning estimate, not a statement from your lender. It uses one fixed payment, one constant APR and interest compounded monthly on the outstanding balance. Real cards may charge interest daily, use a minimum that shrinks with the balance, revert from a promotional rate on a fixed date and charge fees this model ignores. New spending is not included. Take the rate from your statement and read the result as a guide to how fast a steady payment works.

About This Credit Card Payoff Calculator

Use this credit card payoff calculator to get an instant estimate based on the figures you enter. Adjust the inputs above to match your situation, or browse all our calculators to plan your next step.

Frequently asked questions

How long will it take to pay off my credit card?
It depends on your balance, your card's APR and how much you pay each month. A higher fixed payment clears the balance faster and cuts total interest sharply. Enter your figures and the calculator simulates the balance month by month to show the number of months and the interest cost.
What happens if my payment is too small?
If your monthly payment is smaller than the interest added each month, the balance grows instead of shrinking and the card never clears. The calculator detects this and warns you instead of showing an impossible payoff time. Pay more than one month's interest so the balance actually falls.
Does paying the minimum ever clear the balance?
Minimum payments on UK cards are usually the month's interest plus a small percentage of the balance, so they fall as the balance falls and stretch repayment over many years. A fixed payment clears the debt far faster and saves a lot of interest, which is why this tool models a fixed monthly payment.
Is APR the same as the monthly interest rate?
No. APR is an annual figure. The calculator divides it by twelve and applies that each month. A 24% APR is 2% a month, so a £3,000 balance attracts £60 of interest in the first month before your payment is applied.
Should I use the promotional or the standard APR?
Use the rate that applies to your balance. On a 0% balance transfer, enter 0 while it lasts, but the standard rate returns when the promotion ends. For a realistic worst case, run the numbers again at your card's standard purchase APR.

About the author

Taha Kheirandish

Written and reviewed by

Taha Kheirandish

Economics student and independent researcher

Taha Kheirandish reads tax codes the way other people read maps — to find out where a system actually leads, not where it claims to go.

He is an economics student, and his work here is comparative by design. A pension deferral bonus in Quebec, a commuting allowance in Germany, a rent-increase ceiling in the Netherlands: each is a decision a government made about how money should move, and each reads differently once you set it beside eight others. He builds and checks these calculators across nine markets from primary sources — the regulation rather than a summary of it, the ministry’s own circular rather than a news item quoting it.

That is the editorial standard of the site as well as his habit. Every rate, threshold and bracket here carries the document it was read from and the date it takes effect, and gets re-checked when the law moves rather than when someone happens to notice.

He is a researcher, not a licensed adviser, and nothing on this site is personal financial advice. It is arithmetic done carefully with its sources shown — so that you can check it, and take it to someone who is.

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