Why the minimum payment is designed the way it is
The minimum payment is typically a small percentage of the balance, often around 3–5%. Because it falls as the balance falls, it stretches repayment over a remarkably long period.
On a $5,000 balance at 24% APR, paying only the minimum takes over eight years and costs more than $3,100 in interest. Paying a fixed $250 a month clears it in around 26 months for roughly $1,450. Same balance, same rate — the difference is roughly $1,700 and six years.
This is not an accident of arithmetic. A minimum payment that shrinks with the balance is the structure that maximises interest collected while remaining affordable enough that you keep paying.
The point where a balance never clears
If your monthly payment is less than the interest charged that month, the balance grows no matter how long you pay. The calculator flags this case explicitly rather than showing an implausible number.
At 24% APR, monthly interest is 2% of the balance. On $5,000 that is $100 a month before any principal is touched. A payment below that is not repayment — it is a subscription.
Fix the rate before optimising the payment
Before increasing payments, check whether the rate can be lowered. Three routes are worth the phone call.
A balance transfer to a card offering an introductory 0% period can eliminate interest entirely for a window, though transfer fees of 1–3% apply and the rate after the promotional period is often high. It only works if you clear the balance within the window.
A personal loan at a lower rate converts revolving debt into a fixed term with a fixed end date. The end date is worth as much as the rate reduction — revolving debt has no natural conclusion.
Asking your issuer for a lower rate works more often than people expect, particularly with a good payment history and a competing offer in hand.
Multiple cards: two valid orderings
The avalanche method pays the highest rate first. It is mathematically optimal and costs the least in total interest.
The snowball method pays the smallest balance first. It costs slightly more and closes accounts sooner, which produces visible progress. Research on actual repayment behaviour has found people are more likely to finish with the snowball method.
The best method is whichever one you complete. A slightly suboptimal plan followed to the end beats an optimal plan abandoned in month four.
The comparison worth making
Credit card rates of 20–40% exceed any investment return available to you. Clearing a balance at 24% is a guaranteed, tax-free 24% return with no risk. Nothing in a portfolio competes with that, which is why card debt comes before investing, before overpaying a mortgage, and before almost everything except a minimal emergency buffer.
Frequently asked questions
How long will it take to pay off my credit card?
It depends heavily on whether you pay a fixed amount or the minimum. On a $5,000 balance at 24% APR, a fixed $250 a month clears it in about 26 months for roughly $1,450 in interest, while paying only the minimum takes over eight years and costs more than $3,100.
Why does paying the minimum take so long?
The minimum is a percentage of the balance, so it shrinks as the balance shrinks. That stretches repayment over many years and maximises the interest collected while keeping each payment affordable enough that you continue.
What happens if my payment is less than the interest?
The balance grows rather than falls, and it never clears. At 24% APR the monthly interest is 2% of the balance - $100 a month on $5,000 - so any payment below that adds to what you owe.
Should I pay off credit cards before investing?
Almost always. A 24% card rate is a guaranteed, tax-free 24% return when cleared, with no risk. No investment reliably competes with that, so card debt comes before investing and before overpaying a mortgage.