Why Minimum Payments Can Keep You in Debt for Years
Paying the minimum on a card statement keeps the account in good standing. That is its job: it protects you from a missed payment, not from interest. A small minimum can stretch repayment over many years and cost more in interest than you borrowed, and a minimum no larger than the month's interest never shrinks the debt at all. The usual fix: find out how your minimum is calculated and pay a fixed amount above it.
What is happening
Every month the card adds interest: in the simplest model, the annual rate divided by twelve, so 2.5% of the balance a month at 30% a year. Your payment covers interest and fees first; only the rest reduces the debt. As the balance falls, a minimum calculated from it falls too, so less and less goes to the debt.
Issuers use different formulas: interest and fees plus a percentage of the balance, or a flat percentage with interest included, usually with a fixed floor. The flat percentage has a trap. If the monthly rate is r, the debt goes down only when the minimum is more than r/(1 + r) of the balance, which is the same as saying more than the month's interest. At 30% a year that threshold is about 2.44%: a 2% minimum lets the debt grow, and a 2.45% minimum would still leave 87% of it unpaid after a hundred years in the model below.
The table is a model, not a forecast: 100,000 units owed, no new spending, no fees, no interest-free period, interest added monthly before the payment, and the payment never below 1,000 units. The rates are scenarios, not market averages.
| How the payment is set | 20% a year | 30% a year |
|---|---|---|
| Interest + 1% of the balance | 13.1 years; interest 126,004 | 14.7 years; interest 200,734 |
| 2% of the balance, interest included | 24.8 years; 285,451 | never repaid |
| 3% of the balance, interest included | 10.7 years; 96,026 | 21.9 years; 328,773 |
| 5% of the balance, interest included | 5.9 years; 43,548 | 7.4 years; 84,238 |
| The first "interest + 1%" minimum (2,667 or 3,500), kept as a fixed payment | 5.0 years; 58,242 | 4.2 years; 77,579 |
Freezing the first minimum instead of letting it shrink cuts the time 2.6 times at 20% and 3.5 times at 30%, and the interest by more than half.
United Kingdom. The minimum on a credit or store card must be at least the interest, fees and charges plus 1% of the balance (FCA, CONC 6.7.5R). If over 18 months you have paid more in interest, fees and charges than off the balance, the card company must tell you. If that goes on for about 36 months, it must offer a way to repay faster, usually within three to four years, and may suspend or cancel the card if you decline or do not reply (CONC 6.7.27R–6.7.35R).
United States. Every statement carries a "Minimum Payment Warning": how long repaying with minimums alone would take and what it would cost in total, a toll-free number for credit counselling, and, unless the minimums already clear the debt within three years, the payment that would clear it in 36 months (Regulation Z, 12 CFR 1026.7(b)(12)). For scale: the average rate on commercial bank credit cards in the second quarter of 2026 was 20.94% across all accounts and 22.15% on accounts that were charged interest (Federal Reserve, G.19).
What to do
- Find the formula and the rate in your card agreement or statement.
- Pay a fixed amount, at least your first minimum, rather than whatever the statement asks for. Automate the minimum, then add extra: automate every bill.
- Stop adding new spending to a card you are paying down: no new debt while paying off old.
- Several debts? Pay the minimum on all of them and send extra to one: snowball or avalanche, high-interest debt first.
- Thinking of moving the balance to a loan? Compare the total you will repay, not the rate: what a loan really costs.
- Cannot pay even the minimum? Contact the lender before the due date: if you can't make a payment, debt is not a moral failure.
When this is not the case
- You pay the whole statement balance within the interest-free period. Then there is no interest and the minimum does not matter; what ends that period differs between cards.
- A 0% promotional rate or interest-free instalments. While the offer lasts, a small payment costs no interest. What matters is the date it ends and the rate after it: interest-free instalments, buy now, pay later is debt.
- A short cash squeeze. Paying only the minimum for a month or two to keep a cushion and avoid a missed payment can be right: emergency fund. It gets expensive as a plan for years.
The same arithmetic works for savings: compound interest. More on using a card safely: a tool, not free money, your credit limit is not your money. For contracts beyond credit: how to read an insurance policy.
Sources
- FCA Handbook — CONC 6.7: minimum repayments and persistent debt (UK)
- CFPB — Regulation Z, 12 CFR 1026.7, periodic statement (US)
- Federal Reserve — G.19 Consumer Credit (US)
Checked: 24 September 2026
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