The minimum payment on a credit card is set so that you stay current, not so that you get out of debt. If you only ever pay the minimum, the balance does go down, but slowly enough that interest can end up costing more than the original amount you charged.
Here’s a worked example so you can see how that happens.
The setup
Take a $5,000 balance on a card with a 24% APR. Assume you stop using the card entirely, so nothing new is added.
Card issuers use different minimum payment formulas. A common one is 1% of the balance plus that month’s interest, with a floor of around $25. We’ll use that.
A 24% APR works out to 2% a month. So in month one:
- Interest: 2% of $5,000 = $100
- 1% of the balance: $50
- Minimum payment: $150
Of that $150, $100 goes to interest. Only $50 actually reduces what you owe. Your new balance is $4,950.
Why it drags on
The trick is in the formula. Because the minimum is tied to the balance, it shrinks as the balance shrinks. In month two, the balance is $4,950, so the minimum drops slightly to $148.50. A year in, the minimum is lower still. Every month, you’re paying down roughly 1% of what’s left, and 1% of a smaller number is a smaller number.
That’s why the payoff curve flattens out. The balance falls fastest in the early years and then crawls. Eventually the minimum hits the $25 floor, and only then does the balance start falling faster again.
The result
Following that formula all the way down, the $5,000 balance takes 234 months to pay off. That’s 19 and a half years. Total interest paid comes to about $8,890, so you’d pay roughly $13,890 in total for $5,000 of purchases.
Your own card’s numbers will differ depending on its formula and rate. But the shape is the same on nearly every card.
It also assumes nothing goes wrong for almost two decades: no new charges, no late fees, no rate increase. In real life, a card that’s being paid at the minimum often keeps getting used, and then the balance barely moves at all. A $60 monthly subscription on the same card would cancel out more than the $50 of principal you paid down in month one.
What a fixed payment does
Now take the same $5,000 at 24%, but pay a fixed amount every month instead of letting the payment shrink:
| Monthly payment | Time to pay off | Total interest |
|---|---|---|
| Minimum only (starts at $150, shrinks) | 234 months (19.5 years) | About $8,890 |
| Fixed $150 | 56 months (4.7 years) | About $3,320 |
| Fixed $200 | 36 months (3 years) | About $2,000 |
| Fixed $250 | 26 months (2.2 years) | About $1,450 |
Look at the first two rows. In month one, the minimum and the fixed payment are the same $150. The only difference is that in the second row you keep paying $150 even after the card says you could pay less. That one habit cuts the payoff time from 19.5 years to under 5 and saves about $5,500.
Your statement already shows this
Under federal law, credit card statements include a minimum payment warning. It shows how long it would take to pay off your current balance with minimum payments only, and how much you’d pay in total. It also usually shows a monthly amount that would clear the balance in three years, and what that would cost.
Most people skip right past that box. It’s worth reading once, because it’s your actual balance and your actual rate, not an example.
A simple way to break the pattern
When you set up autopay, many issuers give you three choices: minimum payment, statement balance, or a fixed amount. If you can’t pay the full balance yet, choose a fixed amount and set it at least as high as this month’s minimum. Then leave it there as the balance falls. You’ve turned a shrinking payment into a steady one without having to think about it each month.
If you can manage more later, raise the fixed amount. Even an extra $25 or $50 a month makes a visible difference on a balance charging 24%.
And always pay at least the minimum on time. Paying only the minimum is expensive, but missing it is worse: it can trigger late fees, a penalty rate, and a late payment mark on your credit report.
This post is general information, not financial advice.