Minimum Payment Trap Calculator
A minimum payment is a percentage of the balance, so it shrinks as fast as your debt does. Enter your cards to see the years and the interest that implies — and what any fixed amount above the minimum does to the same balances.
The cards you are paying the minimum on
On top of every minimum, aimed at your highest APR first.
$21,054.21 handed over on $9,200.00 of balances — $2.29 for every $1 you owe.
- Total balances
- $9,200.00
- First month's minimums
- $280.91
- Interest on minimums only
- $11,854.21
| Card | Balance | First minimum | Time to clear | Interest |
|---|---|---|---|---|
| Store card | $6,000.00 | $183.44 | 18 years, 9 months | $9,084.26 |
| Rewards card | $3,200.00 | $97.48 | 11 years, 4 months | $2,769.95 |
Adding $100.00 a month clears everything in 4 years, 11 months, cutting the interest by $7,633.17.
What each extra amount buys
How a declining minimum is modeled month by month
Each month interest is posted at one twelfth of the APR, and the minimum is then billed on the balance that now includes it — the order a statement uses. The minimum is a percentage of that balance, lifted to a dollar floor when the percentage falls below it. Because the percentage scales with the balance, the payment falls in step with the debt, which is what stretches the payoff. The floor is the only part that does not shrink, and it is what eventually ends a small balance.
Interest = Balance × (APR ÷ 12); Minimum = max(Balance × Min%, Floor)- Min%
- Percent of the statement balance your issuer bills
- Floor
- Dollar minimum applied when the percentage is smaller
- Extra
- Fixed amount on top, sent to the highest APR first
If the billed minimum is ever less than or equal to that month's interest, the balance cannot fall — and it cannot recover later, because the percentage part of the minimum scales with the balance exactly as the interest does while the floor is fixed against a balance that is now rising. The calculator returns no payoff date in that case, and says why. It also distinguishes that from a balance that does shrink but not within the hundred years modeled here, because calling the second one “never” would claim something the arithmetic does not support.
$9,200 across two cards, paying only the minimum
Take a $6,000 store card at 22.9% APR and a $3,200 rewards card at 18.5%, both billing 3% of the balance with a $25 floor. The first month's minimums come to $280.91 — $183.44 and $97.48. Paying exactly that, and only that, the rewards card clears after 136 months and the store card after 225: 18 years and 9 months before both are gone.
The interest over those years is $11,854.21, and $21,054.21 leaves your account in total against $9,200 of balances. That is $2.29 handed over for every $1 owed.
Adding a flat $100 a month on top of both minimums, aimed at the 22.9% card first, clears everything in 59 months instead of 225 and cuts the interest to $4,221.04 — $7,633.17 saved. At $250 a month it is 30 months and $2,277.36 of interest. The extra works so hard because it is fixed: unlike the minimum, it does not shrink as the balance does.
What this calculator assumes
- Each card's APR is fixed for the whole payoff period, with no promotional or penalty rate changes.
- The minimum is a flat percentage of the statement balance, lifted to the dollar floor you set (default $25). Interest posts before the minimum is calculated.
- No new purchases, cash advances, annual fees, or late fees are added to any balance.
- Each card is paid independently under minimums only. Nothing rolls over when a card clears, because nothing rolls over in real life when you pay minimums.
- Any extra you enter is a fixed amount on top of every minimum, applied to the highest-APR card until it clears, then the next.
- Money values are rounded to the nearest cent for display.
Understanding the Minimum Payment Trap Calculator
A credit card minimum is not a payment plan. It is a percentage of whatever you owe, so it shrinks exactly as fast as the balance does — which means the payoff never accelerates. Every month you pay a little less, the balance falls a little slower, and the finish line moves away from you at almost the same rate you walk toward it. That is the trap, and it is arithmetic rather than misfortune.
This calculator runs each of your cards on its own minimum, month by month, until it clears — or until it becomes clear that it never will. Then it shows what any fixed amount above the minimum does to the same balances. On most cards the second number is startling, because a flat extra payment does not shrink as the balance falls, so all of it goes to principal and the effect compounds.
Who this calculator is for
- Anyone paying minimums on a cardwho has never seen the payoff date that implies.
- People deciding how much extra to sendwho want the years and interest a specific extra amount buys.
- Anyone with a high-APR balancewho needs to know whether their minimum even covers the interest.
- People with several cards at oncewho want the whole picture rather than one account at a time.
- Anyone weighing a transfer or a loanwho needs a baseline cost before comparing an offer against it.
Why it matters
- It turns an abstract habit into a date and a dollar figure — the years of payments and the total handed over, for balances you can check on your own statement.
- It reports the payoff multiple: the total paid divided by the balance owed. Seeing $2.29 leave your account for every $1 borrowed is the number that changes behaviour.
- It detects the case where the billed minimum is smaller than the month's interest, and says the balance never clears rather than printing a payoff date that does not exist.
- It prices any fixed extra you might send, so the choice between $50 and $250 a month becomes a difference in years, not a feeling.
- It runs each card separately, which is what actually happens when you pay minimums — nothing rolls over, nothing accelerates.
How to use this calculator
- Enter each card with its balance, APR, and the minimum percentage your issuer bills — commonly 2% to 4% of the balance.
- Check the minimum payment floor under advanced assumptions. Most issuers bill at least $25 to $35 once the percentage falls below it, and that floor is what makes small balances end at all.
- Read the minimum-only result: the time to clear, the interest, and the multiple of your balance you would hand over.
- Enter an extra amount you could add each month, aimed at your highest APR first, and read the new payoff time.
- Use the comparison cards to see what $50, $100, and $250 a month each buy on the same balances.
How to read your result
The headline figure is the time to clear every balance while paying only the minimums, and beneath it the total handed over expressed as a multiple of what you owe. A multiple above 2 means more of your money goes to the issuer than to the thing you originally bought. The per-card table shows which account is responsible: a large balance at a high rate with a low minimum percentage will dominate the timeline even if it is not the one that worries you most.
If a card shows no payoff date at all, read the reason carefully. Either the billed minimum is smaller than that month's interest — in which case the balance grows every month and no amount of patience fixes it — or it pays down so slowly that the end lies beyond the hundred years this calculator will model. Both mean the same thing in practice, and both mean the minimum is not a strategy. Compare that against the extra-payment result: a fixed amount on top does not shrink with the balance, which is precisely why a modest, unwavering extra collapses the timeline.
- Minimum payment rules vary. Many issuers bill 1% of the balance plus that month's interest and fees, which always amortizes; a flat percent-of-balance rule may not. Check your statement and use your own percentage.
- New charges reset the whole picture. The model assumes nothing further is added to any balance.
- A missed payment can trigger a penalty APR, which on some cards is close to 30% and changes which card is really the expensive one.
- Promotional rates end. A balance sitting at 0% today may be at a standard rate next year, and this model uses one fixed APR throughout.
- The extra payment is modeled as a fixed amount on top of every minimum, aimed at the highest APR. Freed-up minimums are deliberately not rolled forward — that is the snowball effect, and it belongs to a different calculator.
- This is the cost of the debt, not the cost of a missed rent payment. Paying more than you can sustain is its own risk.
- Set the automatic payment to a fixed dollar amount rather than 'minimum due'. A flat amount stops shrinking as the balance falls, which is where most of the gain comes from.
- Round the fixed amount up to something memorable and leave it alone. The comparison cards show that the difference between $50 and $100 a month is usually measured in years.
- If one card's minimum does not cover its interest, that account needs attention before any optimisation — nothing else you do will matter while the balance is still growing.
Frequently asked questions
Why does paying the minimum take so long?
Because the minimum is a percentage of the balance, so it falls as the balance falls. Your payment shrinks in step with your debt, which keeps the ratio of interest to principal roughly constant. A fixed payment behaves the opposite way: as the balance drops, the interest portion drops and more of the same payment goes to principal.
Can a minimum payment fail to clear a balance at all?
Yes. If the billed minimum is less than the interest charged that month, the balance rises, next month's interest is larger, and it never recovers. That happens when the minimum percentage is below the monthly rate — a 1% minimum on a card charging 30% APR, for example, where one twelfth of the rate is 2.5%. This calculator detects it and says there is no payoff date rather than printing one.
What minimum percentage should I enter?
Use the one on your own statement. Common rules are a flat 2% to 4% of the balance, or 1% of the balance plus that month's interest and fees. This calculator models the flat percent-of-balance rule with a dollar floor, which is what produces the long tail.
What does the payoff multiple mean?
It is the total you hand over divided by the balance you started with. A multiple of 2.29 means $2.29 leaves your account for every $1 you owed. It is the same information as the interest total, expressed in the form people find hardest to ignore.
Where should an extra payment go first?
This calculator sends it to the highest APR, which minimizes total interest. Some people clear the smallest balance first instead, for the momentum. The snowball vs. avalanche calculator prices that trade-off directly.
Are my inputs saved or shared?
No. Every calculation runs in your browser; nothing is stored on our servers or sent to analytics. A shareable link only encodes the numbers you choose to share.
What to do with the number
Once you know what minimums cost, the next question is which order to attack the balances in — the snowball vs. avalanche calculator prices both. To work backwards from a date instead, use the debt-free date calculator. If the rate itself is the problem, compare a consolidation loan or a 0% balance transfer against this baseline, and check where you stand with lenders in the debt-to-income calculator.
Sources and review notes
- Consumer Financial Protection Bureau — Consumer Credit Card Market Report (minimum payment practices and card pricing)
- Federal Reserve — G.19 Consumer Credit release (published credit card interest rates)
Methodology last checked Jul 28, 2026. The declining-minimum simulation is covered by deterministic unit tests, including the case where the minimum never covers the interest and the case where a balance clears only past the modeling horizon. No financial professional review is claimed yet.