How your minimum payment is actually calculated
Most issuers set the minimum as whichever is larger: a small percentage of your balance (commonly 1–3%) or a flat floor amount (often $25–$35). Some issuers use a third formula — interest charged plus 1% of principal — which produces very similar numbers in practice. Check your card's terms for the exact figure; the calculator above uses the percent-plus-floor model since it's the most common and the easiest to verify against your statement.
Why minimum-only payments take so long
Here's the trap: as your balance drops, your minimum payment drops with it, because it's a percentage of a shrinking number. Less of each payment goes to a balance that's barely smaller than before, and interest keeps compounding on what's left. The result is a payoff curve that looks fast at first and then crawls — on a typical 22% APR card with a 2% minimum, paying only the minimum can stretch a balance out for decades and cost more in interest than the original purchase.
The one-line fix: freeze the payment
The single most effective change you can make without touching your budget is to keep paying your first month's minimum amount every month afterward, instead of letting the required minimum shrink alongside the balance. Because the payment no longer declines, a steadily larger share of it attacks principal each month — the same mechanism behind extra mortgage payments. Run the numbers above: the fixed-payment column is almost always dramatically faster and cheaper, for zero additional dollars out of pocket beyond what you were already paying in month one.
Where this fits in a real payoff plan
Freezing the payment helps with one card. If you're juggling several balances, the bigger lever is method: snowball (smallest balance first) or avalanche (highest APR first) decide which card gets any payment above the frozen minimums on all the others — our debt snowball calculator runs both side by side. Either way, the math only works if the balance stops growing — pause new charges on the card you're paying down.
For the full month-by-month schedule across every card and loan you're carrying — not just one — the SheetWell Debt Payoff Planner tracks up to 8 debts at once with snowball/avalanche comparisons and a payoff date that updates automatically as you log payments.
Frequently asked questions
- Why did my minimum payment go down this month?
- Because it's calculated as a percentage of your current balance (with a floor), so as the balance drops, so does the required minimum. This is normal — and exactly why minimum-only payoffs take so long. Keeping your payment at its original dollar amount, instead of letting it shrink, fixes this without costing you anything new.
- Is paying only the minimum ever a reasonable choice?
- Short-term, yes — if cash is genuinely tight, the minimum keeps the account current and your credit score intact while you stabilize. Long-term, it's the most expensive way to carry a balance. As soon as you can spare anything extra, even $20/month, it meaningfully shortens the payoff and cuts interest.
- How is the minimum payment different from interest-only?
- Interest-only would mean the balance never goes down. Minimum payments are slightly more than interest-only — they include a small sliver of principal (the percent-of-balance amount above what interest accrued) — which is why the balance does eventually shrink, just very slowly.
- What's the fastest way to get out of minimum-payment debt?
- In order of impact: stop new charges on the card, freeze your payment at the first month's minimum instead of letting it decline (shown above), then add any extra you can find on top — directed by avalanche order if you're juggling multiple cards. A 0% balance-transfer card can also pause interest entirely for a promotional period if you qualify.