The formula credit card issuers use

Credit card companies calculate your minimum payment using one of two methods, and the card issuer chooses which one. The most common method is the percentage-plus-interest method: they take a percentage of your total balance (usually 1 to 3 percent) and add any interest charges and fees from that billing cycle. The second method is the interest-plus-fees method: they add up all interest and fees, then add a small percentage of the principal balance—often just 0.5 to 1 percent. Both methods produce a number that covers interest and fees but leaves most of the principal untouched.

Your card issuer's terms—found in the disclosure document you received when you opened the account—specify which calculation they use. You can also call the customer service number on the back of your card and ask directly. The math happens automatically each month; you do not choose the method or negotiate the result.

Key Takeaways

  • Minimum payments are calculated by adding interest and fees to either a percentage of your balance or a fixed dollar amount, whichever is higher.
  • The percentage used is typically 1 to 3 percent of your total balance, meaning you pay mostly interest and very little principal each month.
  • If your balance is under a certain threshold (often $25 to $35), your minimum payment may be the full balance or a flat dollar amount instead.
  • Paying only the minimum extends how long you carry the debt and increases the total interest you pay over time.
  • Your card issuer sets the calculation method and is required to disclose it in your account agreement.

Why the percentage is so low

The percentage of your balance used in the minimum payment calculation—typically 1 to 3 percent—is deliberately small. If you owe $5,000 and your issuer uses 2 percent, your minimum is $100 before interest and fees are added. That $100 covers almost no principal; most of it goes to interest. This is by design: the card issuer profits from interest charges, so they structure minimums to keep you paying interest for as long as possible.

Federal law requires card issuers to set minimums high enough that you make progress on the debt—you cannot have a minimum of $1 on a $5,000 balance. But the law does not require the minimum to be high enough to pay off the balance in any reasonable timeframe. A minimum payment that takes five to ten years to clear a balance is legal.

What happens if your balance is very small

If your balance falls below a certain amount—usually $25 to $35, depending on the issuer—your minimum payment becomes the full balance plus any interest and fees. This prevents you from carrying a tiny balance indefinitely and paying interest on $3 forever. Once your balance drops below that floor, you are expected to pay it off completely that month.

Some issuers also set a flat minimum dollar amount (for example, $15 or $25) that applies when the percentage calculation would produce a smaller number. This ensures the issuer collects at least something each month, even on very small balances.

How interest and fees change the number

The minimum payment calculation starts with the percentage of your balance, but interest and fees are added on top. If your calculation produces $100 but you also owe $45 in interest charges and a $35 late fee, your minimum payment is now $180. Interest accrues daily on your balance, so the amount added to your minimum changes slightly each month based on how much you spent and when you made payments.

Annual percentage rate (APR) and how often interest compounds affect how much interest gets added. A card with a 24 percent APR will generate more interest charges than a card with 18 percent APR, assuming the same balance. The interest portion of your minimum payment reflects the APR and the number of days in the billing cycle.

The cost of paying only the minimum

Paying only the minimum means you are paying mostly interest and almost no principal. On a $5,000 balance at 20 percent APR, the minimum payment might be $150 to $200 per month. Of that, roughly $80 to $85 goes to interest in the first month, leaving only $65 to $120 for principal. As you pay down the balance slowly, the interest portion shrinks—but so does the principal portion, because the minimum itself is shrinking.

At this pace, a $5,000 balance can take seven to ten years to pay off, and you will pay $2,000 to $3,000 in interest alone. If you pay $300 per month instead, you clear the same balance in roughly 20 months and pay only $600 in interest. The difference between minimum and double-minimum is years of payments and thousands of dollars.

How to find your card's specific calculation

Your card issuer must disclose the minimum payment calculation in the Schumer Box—the table of terms and rates that came with your account agreement or appears on your online account page. Look for language like "1.5% of new balance" or "interest and fees plus 1% of principal." If you cannot find it online, call the customer service number on your card and ask: "What percentage of my balance do you use to calculate my minimum payment?"

You can also work backward from your statement. Look at your current balance, your minimum payment, and the interest and fees charged. Subtract the interest and fees from the minimum; the remainder should be close to the percentage of your balance. If your balance is $3,000, your minimum is $120, and interest and fees are $45, then $75 is the principal portion—which is 2.5 percent of $3,000.

Frequently Asked Questions

Can I pay less than the minimum?

No. Paying less than the minimum triggers a late payment, which damages your credit score and may result in a penalty APR (a higher interest rate). Your card issuer reports the late payment to credit bureaus after 30 days past due. If you cannot afford the minimum, contact your issuer and ask about hardship programs or temporary payment reductions.

Does paying the minimum hurt my credit score?

Paying the minimum on time does not hurt your score directly—on-time payments help it. However, carrying a high balance relative to your credit limit (high utilization) does hurt your score, and paying only the minimum keeps your balance high. Paying more than the minimum lowers your utilization and improves your score faster.

Why does my minimum payment change every month?

Your minimum changes because your balance changes, and interest and fees change. If you spend more, your balance grows and so does your minimum. If you make a large payment, your balance shrinks and your minimum drops. Interest charges also vary based on your APR and the number of days in the billing cycle, so the interest portion of your minimum fluctuates slightly.

What if I miss a payment—does the minimum increase?

Yes. A late payment typically triggers a penalty APR, which increases your interest rate and the interest portion of your minimum payment. Some issuers also add a late fee ($25 to $40) to your next minimum. The minimum itself is recalculated using the new, higher APR, so you owe more the following month.

Is there a way to lower my minimum payment?

You cannot negotiate the calculation method, but you can lower your minimum by lowering your balance. Paying down principal reduces the percentage calculation and the interest charges, which shrinks your minimum. If you are struggling, contact your issuer and ask about hardship programs; some offer temporary reductions in minimum payments or interest rates for cardholders facing financial difficulty.