How Credit Card Minimum Payments Are Calculated

The minimum payment on your credit card statement looks like a number someone chose for you. It is — but it comes out of a formula, the formula is in your cardholder agreement, and there are really only two versions of it in circulation. Knowing which one your card uses tells you exactly what next month's minimum will be, and — more useful — exactly why paying only the minimum keeps you in debt for decades. If you just want your number, the minimum payment calculator runs both formulas; this article explains what it's doing.

Formula one: a percent of the balance

The most common method: your minimum is a flat percentage of your statement balance, usually between 1% and 3%, most commonly 2%. Owe $5,000 on a 2% card and the statement asks for $100. Owe $10,000 and it asks for $200. The percentage doesn't change; the dollar amount tracks the balance — down as you pay, up as you spend.

Formula two: interest plus a percent of the balance

The second method adds up the month's interest and fees, then tacks on a small percentage of the balance — typically 1% — as forced principal. On $5,000 at 22% APR, the month's interest is about $91.67, plus 1% of the balance ($50), for a minimum of about $141.67. This version produces a higher minimum than formula one, and it has a property worth noticing: the payment always covers the interest, so the balance always falls, at least a little. Formula one doesn't guarantee that — at a high enough APR, 2% of the balance can be less than the month's interest, and a minimum-only balance actually grows.

The floor

Both formulas come with a dollar floor, typically $25–$35: if the formula produces less, the floor is your minimum, and once your balance is below the floor you simply owe the balance. The floor exists because a $6 payment isn't worth anyone's processing costs — and, conveniently for the payoff math, it's the only part of the minimum that refuses to shrink with the balance. On small balances the floor is what finally finishes the card off.

A worked example, all the way down

Take $5,000 at 22% APR on the common formula — 2% of the balance, $25 floor. This month's minimum is $100, of which about $91.67 is interest. Roughly $8 touches the balance. Next month the balance is a hair over $4,990, so the minimum drops to $99.83 — and of that, $91.51 is interest again. Every month the payment shrinks in step with the balance, keeping you on a treadmill that barely moves: run to the end and the card takes about 80 years to clear, paying roughly $43,400 in interest on the original $5,000. These aren't scare figures; they fall straight out of the arithmetic, and you can reproduce them in the calculator in under a minute.

Why minimums are designed this low

A minimum that barely outpaces the interest keeps the account profitable for as long as possible while looking affordable on the statement — that's the design, not an accident. Federal rules require minimums to retire some principal, which is why the formulas exist at all, but "some" is doing very light work in that sentence. The CFPB's Ask CFPB library covers what issuers must disclose — including the box on every statement showing your own minimum-only payoff time, which is this same math, printed monthly, and routinely ignored.

What to do with this

Don't let your payment shrink. Whatever you can pay this month — even if it's exactly this month's minimum — keep paying that same dollar amount every month. A fixed $100 clears the $5,000 example in about 11½ years instead of 80; a fixed $200 does it in under 3. The credit card payoff calculator shows the timeline for any fixed payment, and if you're juggling several cards, avalanche vs. snowball covers the order of attack. Whatever the strategy, the mechanism is the same: the minimum is calculated to shrink, so the entire trick is refusing to shrink with it.

This article is general information, not personalized financial advice. Your card's exact formula, floor, and treatment of fees are in your cardholder agreement. How we write and review articles is covered in the editorial note on our About page.