A credit card minimum payment is a percentage of the outstanding balance, so it falls as the balance falls — and the payoff stretches out for decades. A 6,000 balance at 22.9 per cent cleared over 36 months costs about 232 a month and 2,350 in interest; the same balance on minimum payments alone takes very much longer and costs a multiple of that.
The fix is to fix the payment. Paying a constant amount rather than the stated minimum turns an open-ended arrangement into a loan with an end date.
Why does a falling payment take so long?
Because the interest is charged on the balance and the payment shrinks alongside it, so the proportion going to principal barely improves. The debt approaches zero asymptotically rather than reaching it.
That is not an accident of the arithmetic; it is how the product is designed. A minimum payment keeps the account current and the balance productive, and there is no point at which the schedule naturally ends.
What does an extra payment do?
Far more than the same amount on a low-rate loan, because the rate is high. Paying an extra 50 a month on that 6,000 balance clears it roughly six months sooner and saves several hundred in interest.
| Monthly payment | Roughly clears in | Interest paid |
|---|---|---|
| 232 | 36 months | ~2,350 |
| 282 | ~30 months | Several hundred less |
Card interest is high enough that small extra payments matter a great deal, which is the reverse of the usual advice about overpaying a mortgage. On a 22.9 per cent card, a pound of overpayment avoids nearly 23p of interest a year for as long as the debt would otherwise have run.
How much does the rate matter?
More than on any other common debt. At 22.9 per cent the interest on a 6,000 balance is about 114 in the first month alone, so a 150 payment moves the balance by 36 — which is why a payment that feels substantial can appear to do almost nothing.
That first-month figure is the useful diagnostic. Divide the annual rate by twelve, multiply by the balance, and compare it with the payment: if the two are close, the balance is barely moving and the plan needs a larger payment or a lower rate rather than patience.
Which debt should be cleared first?
The highest rate, mathematically. Two strategies circulate and they optimise different things.
- Avalanche. Clear the highest interest rate first. Costs the least in total, and it is the correct answer arithmetically.
- Snowball. Clear the smallest balance first. Costs more and produces a visible win sooner, which some people need to sustain the effort.
The difference in total cost is usually smaller than people expect, and the difference in completion rate is not. A plan that gets finished beats an optimal plan that gets abandoned.
One structural detail is worth knowing: payments are generally applied to the highest-rate portion of a balance first under consumer rules in the UK and the US. That matters on a card carrying both a purchase balance and a cash advance, where the advance is usually the expensive part.
What about a balance transfer?
It buys time rather than money, and only if the balance is actually cleared within the promotional period. A 0 per cent transfer with a 3 per cent fee on 6,000 costs 180 upfront, which is far less than the interest it avoids — provided the balance goes to zero before the rate reverts.
The failure mode is well documented: the promotional period ends with a substantial balance remaining, at a rate that is often higher than the original card. Setting the fixed payment at balance divided by promotional months, on the day the transfer completes, is what makes the arrangement work.
Questions people ask
Does the interest-free period on purchases still apply? Only if the statement balance is cleared in full each month. Carrying any balance generally forfeits the grace period, so new purchases start accruing interest immediately — which is why a partly paid card is more expensive than it looks.
Does paying more than the minimum hurt my credit? No. Paying more reduces utilisation, which is generally positive. It is missed payments rather than large ones that cause damage.
How is the minimum actually calculated? Typically a small percentage of the balance plus that month’s interest and fees, with a floor of a few pounds or dollars. The percentage is the part that makes it fall away as the balance does.
Should I close the card once it is clear? Closing reduces available credit and can raise utilisation on what remains. Keeping it open and unused is often better for a credit file, provided the temptation is manageable.
Is a personal loan cheaper? Frequently, and the rate is what to compare. Consolidating card debt into a fixed-term loan at a lower rate also imposes the end date the card lacks.
Why did my balance rise despite paying? Interest accrues daily on most cards, so a payment smaller than the month’s interest leaves the balance higher than it started.
Does a 0 per cent purchase offer work the same way? The same discipline applies: divide the balance by the promotional months and pay that fixed amount. The offers differ in that a purchase deal has no transfer fee, so the arithmetic is slightly kinder.
Fix the payment, attack the highest rate, and give the debt an end date. The credit card payoff calculator shows what a fixed payment and an overpayment each do, and the loan calculator is the comparison for a consolidation at a lower rate.