How the minimum payment trap works
This calculator models one common issuer formula: each month’s minimum is the interest accrued plus 1% of your balance, with an adjustable floor ($25 by default). Check your card agreement and replace that floor above if the rest of its formula matches. Issuers that use a flat percentage or another formula will produce different results. In this model, the payment shrinks as you make progress, so the payoff curve flattens into years and can stretch beyond two decades. Meanwhile a fixed payment, even a modest one, gets more effective every month, because a constant payment against a shrinking balance means an ever-growing share goes to principal.
The single most effective move costs nothing: freeze your payment at today’s minimum instead of letting it slide down. Same starting outlay, radically different ending.
Want the national picture? See our minimum payment statistics — payoff times and costs at the current average APR, by balance and rate, sourced from Federal Reserve data.
Getting out faster
- Fix the payment — the comparison above shows what your chosen amount saves versus the sliding minimum.
- More than one card? Order of attack matters less than consistency, but math favors the highest APR first — compare both strategies with our snowball vs. avalanche calculator.
- Compare a balance transfer carefully — include the transfer fee, promotional period, post-promotion APR, and any new charges before comparing it with the current payoff plan.
- Contact the issuer if payments are difficult — ask whether an assistance or hardship option is available and get any new terms in writing.
Method, example, and sources
How this calculator works
The minimum-payment scenario adds one month of interest and then pays the greater of interest plus 1% of balance or the selected dollar floor. The comparison scenario pays a fixed amount each month. Both simulations stop at zero balance or at the model safety limit.
Worked example
For the default $5,000 balance at 24.99%, the modeled first minimum is about $154. With a $25 floor, minimum-only payments take about 236 months and cost roughly $9,278 in interest; a fixed $200 payment takes about 36 months and about $2,135 in interest.
What the estimate leaves out
- Card issuers use account-specific minimum-payment formulas; the model may not match the agreement.
- New purchases, fees, penalty APRs, promotional periods, and changing rates are excluded.
- Actual statements can round and allocate payments differently across balances with different APRs.
Primary sources
Frequently asked questions
How is a credit card minimum payment calculated?
One common model is interest plus 1% of the principal balance, subject to a dollar floor. This calculator uses that model and lets you change the $25 default floor. Issuers may instead use a flat percentage or other account-specific terms, so check your card agreement: changing the floor alone cannot reproduce a different formula exactly.
Why does paying the minimum take so long?
Early on, most of the minimum payment is swallowed by interest: on $5,000 at 24.99% APR, the first month’s interest is about $104, so a $154 minimum only retires $50 of debt. As the balance drops, the minimum drops too, so the small progress never accelerates. A fixed payment breaks that pattern — every month the same payment covers less interest and more principal.
Does paying only the minimum hurt my credit score?
Not directly — minimum payments count as on-time payments. But a slow payoff can keep your credit utilization high, and utilization is an important input in common scoring models. The exact effect depends on the model and the rest of your credit file.
Is a balance transfer worth it?
Often, yes. A 0% intro APR transfer (typically 12–21 months, with a 3–5% transfer fee) stops the interest clock, so every dollar you pay hits principal. It only works if you can realistically clear most of the balance during the intro window and you stop adding new charges — otherwise you’ve just moved the problem.
Should I pay off my card or invest?
Avoiding 20–30% card interest is a certain saving when prepayment has no fee, while investment returns are uncertain. Priorities still depend on minimum bills, emergency cash, employer-match vesting, taxes, and your full situation; use the comparison as math, not personalized advice.