Credit card minimum payments explained: the slow way out of debt

Every credit card statement names a minimum payment: the smallest amount the issuer will accept that month without treating the account as late. It is designed to keep the account in good standing, not to clear the debt. This guide explains how issuers arrive at the figure, why it falls as the balance falls, what that does to the payoff time, what regulators in the US and the UK require issuers to tell you, and what happens to the same 6,000 balance under three different payment patterns.

What a minimum payment is

Each month the issuer adds up what was owed at the previous statement, subtracts payments received, adds new purchases, and adds the interest and any fees for the period. The result is the statement balance. Alongside it, the statement shows the minimum payment due and the date it must arrive by. Paying at least the minimum on time keeps the account open, avoids a late-payment fee, and means nothing adverse is reported to credit reference agencies for that month.

What the minimum does not do is reduce the balance by very much. On a card charging interest, most of a small payment goes on the interest that was just added. Only the part above the interest reduces what is owed. If the statement shows 120.00 of interest and the minimum is 150, the balance has fallen by 30.00, which is half a percent of a 6,000 debt.

How issuers set the minimum

The formula is set by the issuer and written into the card agreement, so it varies between cards and between countries. Three patterns cover most cards. The credit card minimum payment calculator models each of them.

• A percentage of the statement balance, with a floor. The minimum is a set share of the balance after interest has been added, commonly somewhere in the region of 1% to 3%, but never less than a fixed floor amount, commonly 25 or thereabouts. The calculator calls this the % of balance rule: max(statement balance × pct, floor).
• A percentage of the balance plus that month’s interest and fees. The minimum is a smaller share of the balance, commonly around 1%, plus the interest and fees charged for the period, again subject to a floor. Many UK cards use this structure, because it guarantees the payment always covers the interest. The calculator calls this % of balance + interest: max(balance × pct + interest, floor).
• A fixed amount. Some agreements set a flat minimum, and many cardholders effectively create one by setting up a standing payment of a round figure that is higher than the issuer’s minimum. The calculator’s Fixed amount rule models this: the same amount every month until the last one, which is capped at whatever balance remains.

Whichever structure applies, the minimum is capped at the statement balance, so the final payment on a nearly cleared card is whatever is left. Issuers can change the formula with notice, and the percentages and floors quoted above are typical figures, not a rule that applies to every card.

Why the minimum shrinks as you pay

Under the two percentage rules, the minimum is recalculated on every statement from the current balance. When the balance falls, the minimum falls in proportion. A 2.5% minimum on a statement balance of 6,120.00 is 153.00; in month 12, on a statement balance of 5,759.75, the same rule asks for 143.99, leaving 5,615.76 owing; in month 120, on a statement balance of 3,174.83, it asks for 79.37, leaving 3,095.46. The payment keeps shrinking until it hits the floor, and only then does repayment speed up.

This is the mechanism that stretches payoff times from years into decades. The reduction in the balance each month is the gap between the payment and the interest, and under a percentage rule both of those shrink together, so the gap stays small for a very long time. A fixed payment behaves differently: the interest falls as the balance falls, but the payment does not, so the gap widens every month and repayment accelerates.

Worked example: three ways to pay 6,000

Take a balance of 6,000 at 24% APR, with no new spending and no fees. Interest is charged monthly at 24% ÷ 12 = 2% of the opening balance, rounded to the cent, so the first month’s interest is 6,000 × 2% = 120.00 and the first statement balance is 6,120.00. Three payment patterns are run through to the last cent.

The first two columns start from almost the same payment, 153.00 against 150.00, yet one takes 406 months and the other 82. The only difference is that the first payment shrinks and the second does not. For comparison, a “1% plus interest” rule with the same 25 floor would start at 180.00 (60.00 plus 120.00 of interest), fall every month, and take 252 months with 10,887.03 of interest: although the payment always covers the interest, the part that reduces the balance is only 1% of it.

The “minimum below interest” trap

A minimum that is lower than the month’s interest does not just slow repayment down; it stops it. The payment is absorbed entirely by interest, the shortfall is added to the balance, and the debt grows despite a payment being made every month.

“Percentage plus interest” formulas exist largely to rule this out, which is one reason they are common in the UK. A plain percentage-of-balance rule falls into the trap whenever the percentage applied to the statement balance comes to less than the month’s interest, which on a card charging 24% APR (2% a month) means a percentage of 1.96% or lower: a 1.5% minimum, for example, starts at 91.80 against 120.00 of interest. A fixed payment can fall into it if the rate rises after the payment was set. The debt payoff calculator flags any debt whose minimum is below its first month’s interest as “never repaid at the minimum”, and the minimum payment calculator reports that the card never clears at the minimum whenever the first minimum does not exceed the first month’s interest.

What statements and regulators tell you

United States. The Credit CARD Act of 2009 and the implementing rule, Regulation Z §1026.7(b)(12), require each periodic statement to carry a minimum-payment disclosure. It states that paying only the minimum will increase the interest paid and the time to repay, gives an estimate of how long repayment would take and the total cost of doing so, and gives the monthly amount needed to repay the balance in 36 months with the total cost of that route. The CFPB notes that the three-year figure assumes no new purchases on the card and the rate in force at the time. If the minimum would clear the balance within three years anyway, the 36-month figures are left off; if the minimum is no more than the interest and so would never clear it, the box carries a different warning and the 36-month payment instead of a payoff estimate; and the box is omitted entirely only for charge cards, for the cycle after two consecutive months paid in full, or when the minimum would clear the whole balance.

United Kingdom. The Financial Conduct Authority’s persistent-debt rules, in CONC 6.7.27 to 6.7.40 of its handbook, followed its credit card market study and came into force in 2018. An issuer must assess each month whether a customer has, over the previous 18 months, paid more in interest, fees and charges than towards the principal. A customer in that position is in “persistent debt”. At 18 months the issuer must prompt the customer to increase payments and explain the cost of continuing at the current level; at 27 months it must repeat the prompt if nothing has changed; and at 36 months it must offer a way to repay the balance over a reasonable period, typically three to four years, which may include suspending the card or, in some cases, reducing or waiving interest.

Neither regime changes the arithmetic in the examples above. Both exist because the arithmetic is so easy to misread: a payment that feels affordable can be a payment that barely moves the balance.

What the calculator shows

The credit card minimum payment calculator takes a balance, an APR and the issuer’s rule (percentage of balance, percentage plus interest, or a fixed amount) with its percentage and floor, and simulates the card month by month until the balance reaches zero or a hundred years pass. It reports the first minimum, how many months the balance lasts, the total interest and total paid, and a month-by-month schedule showing interest, payment and remaining balance. If the first minimum does not exceed the first month’s interest, it says so rather than reporting a payoff date that does not exist.

To see what paying more than the minimum does, the same card can be entered under the fixed rule with a higher amount, or added to the debt payoff calculator alongside other debts with a monthly budget, which also shows how clearing one card frees money for the next. The reasons the interest figures are so large, including how daily compounding and grace periods behave, are covered in the guide to how credit card interest works, and the order in which several cards are cleared is compared in the guide to the debt avalanche and snowball methods. Every figure on this page was produced by the same calculation engine the calculators use, with the method set out on the methodology page.

This guide explains how things work in general terms. It isn’t financial, tax or legal advice. Spotted something out of date? Email errors@debtwren.com and we’ll check it against the source.