The minimum-payment trap: how a few extra dollars change the math

Paying only the minimum means borrowing the rest of your balance at your card’s full purchase APR, month after month, and the minimum shrinks as the balance shrinks, so the debt lingers for years. Take a $5,000 balance on a card with an APR of 22% and a common minimum formula of 1% of the balance plus that month’s interest: paying only the minimum takes about 19 years and costs $8,099.69 in interest, more than the original balance.

Nobody signs a new contract when they pay the minimum. The point of the title is that the choice works like taking a long, expensive loan, and it helps to see the terms before you accept them.

How issuers set the minimum

Most large issuers use a formula like 1% of the balance plus that month’s interest and any fees, with a dollar floor that is often between $25 and $40. A flat 2% of the balance is rarer than people think. Your exact formula is in the cardholder agreement, usually in the section on payments.

The formula explains the long tail. On $5,000 at an APR of 22%, the first month’s interest is $91.67, so the minimum is $141.67, and only $50 of it reduces what you owe. Next month the balance is a little lower, so the minimum is a little lower too. The payment keeps falling with the balance, which is why the last few hundred dollars take years.

What the minimum costs, in numbers

Same $5,000, same APR of 22%, no new purchases. Each line is computed month by month:

• Minimum only (1% plus interest, $25 floor): 230 months, about 19 years, and $8,099.69 in interest.
• A fixed $150 a month: 52 months and $2,798.09 in interest.
• The 36-month payment, $190.95: 36 months and $1,874.28 in interest.
• A fixed $200 a month: 34 months and $1,749.90 in interest.
• A fixed $250 a month: 26 months and $1,285.71 in interest.

The jump from the minimum to a fixed $150 is the one that matters: the first payment is only about $8 more than the minimum, but because it never shrinks, it cuts the interest by about two-thirds and the payoff by 15 years.

To run your own balance, use the payoff calculator below. Your statement’s minimum payment box uses your card’s actual formula, so trust it over any estimate if they differ.

For reference, this is the Federal Reserve’s average APR on credit card accounts that were charged interest:

The box on your statement

The Credit Card Accountability Responsibility and Disclosure Act of 2009 made issuers show you this math. Under Regulation Z (12 CFR 1026.7(b)(12)), each monthly statement must include:

• A “Minimum Payment Warning” that paying only the minimum means more interest and a longer payoff.
• How long it would take to pay off the current balance with minimum payments only, and the total you would pay.
• The monthly payment that would clear the balance in three years, the total cost at that payment, and how much you would save. This part is left off when minimum payments would already clear the balance in about three years or less.
• A toll-free number for information about credit counseling.

The estimates assume no new purchases, so if you are still using the card, the real numbers are worse.

When paying only the minimum is the right call

Sometimes the minimum is the best you can do, and it is far better than paying nothing. Missing it triggers a late fee right away, and once the payment is 30 days late, the issuer can report it to the credit bureaus. If the minimum is more than 60 days late, the issuer can apply a penalty APR to your existing balance after giving 45 days’ notice (12 CFR 1026.55(b)(4)).

So in a month when cash is short, pay the minimum, keep the account current, and hold on to the cash you need for rent and food. If the shortfall will last more than a month or two, call the issuer about a hardship program before you fall behind.

How to get above the minimum and stay there

1. Set a fixed autopay amount. Pick a number above the current minimum, like the $150 in the example, and keep it fixed as the balance falls. That one change does most of the work.
2. Aim extra money at the highest APR. If one card has several balances, Regulation Z requires the issuer to apply anything above the minimum to the balance with the highest APR first (12 CFR 1026.53). If you have several cards, see how the avalanche and snowball methods order them.
3. Stop adding purchases. While you carry a balance, new purchases usually start accruing interest right away because you have lost the grace period. Getting it back usually takes paying the statement balance in full for one or two billing cycles, depending on the issuer. Our guide to how card interest is calculated shows why.
4. Price a cheaper loan. If you can clear the debt within a promotional period, a balance transfer may cost less than the interest you would pay, even after the fee.

The CFPB’s credit card pages and the Regulation Z text have the statement rules cited here.