The "minimum payment due" box on a credit card statement is one of the most expensive defaults in personal finance. It looks like a kindness — a small, manageable number — but it's engineered so that the balance barely moves while interest does the heavy lifting. To show exactly how expensive it is, we ran the numbers. Every figure below is computed, not guessed; the method is spelled out at the end so you can check it.
How a minimum payment actually works
Card issuers don't all use the same formula, but a common one is roughly 1% of your balance plus that month's interest (plus any fees), with a small dollar floor — often around $25 — so the payment never drops below that. The key feature isn't the 1%. It's that the minimum falls as your balance falls. The payment that felt manageable on day one keeps shrinking, and so does the slice of it that touches your actual debt.
Most of each early payment is swallowed by interest. What's left chips a tiny sliver off the principal. Next month the balance is barely lower, the interest is barely lower, and the cycle repeats — for years.
The real cost, by balance and rate
Here's what minimum-only payments cost across common balances and APRs, assuming you add no new spending and make every minimum on time. "Time to clear" is how long until the balance hits zero; "interest paid" is what you hand the bank on top of what you borrowed.
| Starting balance | APR | Time to clear | Interest paid |
|---|---|---|---|
| $2,000 | 20% | 11.2 years | $2,317 |
| $2,000 | 25% | 12.1 years | $3,032 |
| $5,000 | 20% | 18.8 years | $7,317 |
| $5,000 | 25% | 19.7 years | $9,282 |
| $10,000 | 20% | 24.6 years | $15,650 |
| $10,000 | 25% | 25.4 years | $19,699 |
Read that $5,000-at-25% row again: nearly twenty years, and you pay back almost double what you borrowed in interest alone. The $10,000 balance pays roughly its entire principal again in interest — and isn't clear until a child born today could nearly finish high school.
Why it stretches out so far
The trap is the shrinking payment. Early on, a $5,000 balance at 25% accrues around $104 in interest in the first month, and the minimum is only about $154 — so just ~$50 goes to principal. As the balance falls, the minimum falls too, and the principal portion shrinks with it. The math turns into a long, flat tail where you're paying mostly interest on a balance that refuses to die. Only near the very end, when the $25 floor finally exceeds "1% + interest," does the balance start dropping at a meaningful clip.
A minimum payment is calculated to keep you in debt comfortably, not to get you out of it. The slower you go, the more total interest you pay — and the minimum is the slowest legal speed.
The fix: pay a fixed amount instead
Here's the part that should change your behaviour. Take that same $5,000 balance at 25% APR. Instead of paying the shrinking minimum, pay a fixed dollar amount every month and hold it there. Watch what happens — even starting at roughly the same ~$150 the first minimum would have been:
| What you pay each month | Time to clear | Interest paid |
|---|---|---|
| The minimum only (starts ~$154, then falls) | 19.7 years | $9,282 |
| $150, fixed | 4.8 years | ~$3,626 |
| $200, fixed | 3.0 years | ~$2,137 |
| $250, fixed | 2.3 years | ~$1,536 |
| $300, fixed | 1.8 years | ~$1,207 |
The first minimum on this card is about $154. Paying a flat $150 — barely less than that first minimum — clears the card in under five years instead of nearly twenty, and saves more than $5,600 in interest. The entire difference comes from one thing: the fixed payment doesn't shrink, so every dollar above the interest keeps hammering the principal. Bump it to $250 and you're done in a little over two years.
What to actually do
- Never pay the literal minimum if you can help it. Pick a fixed monthly amount and keep it flat until the balance is gone — don't let it drift down with the statement.
- Pay the highest-APR card first (the "avalanche") to minimise total interest, or the smallest balance first (the "snowball") if you need the motivation of quick wins.
- Stop adding new charges to a card you're trying to clear. New spending resets the very tail you're trying to escape.
- Consider a lower-rate option — a balance-transfer offer or a personal loan can cut the APR, but read the fees and the post-promo rate first.
None of this requires heroics. The single highest-leverage move is simply refusing to let the payment shrink.
How we calculated this
We modelled the minimum as the greater of (a) 1% of the current balance plus that month's interest, or (b) a $25 floor — a common real-world structure. Interest compounds monthly at APR ÷ 12, and we assume no new purchases. Fixed-payment payoff uses the standard loan-payoff formula. Real cards vary in their exact minimum formula, floor, fees and compounding, so treat these as well-grounded illustrations of the shape of the cost, not a quote for your specific account. Either way, the lesson doesn't change.
General education, not financial advice. Check your own card's terms for its exact minimum-payment formula.
Sources & further reading
- Consumer Financial Protection Bureau (CFPB) — consumerfinance.gov
- US Federal Reserve — credit card resources
- Investopedia — "Minimum Monthly Payment"