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How your minimum payment is calculated: the three formulas issuers actually use

There is no single minimum-payment rule. Your issuer uses one of three structures — interest plus a percent of the balance, a flat percentage, or a fixed floor — and which one you have decides whether minimum-only payments end in 19 years, 80 years, or never. Here are the formulas, stated precisely, with the arithmetic run on a real balance.

Last updated: October 2026 · Formulas as stated in major issuers' cardholder agreements; your agreement controls your card — check its Minimum Payment section.

Key takeaway

Formula 1 — interest + percent: minimum = this cycle's interest + 1% of the balance (plus fees and past-due amounts). Formula 2 — flat percentage: minimum = 2–4% of the balance. Formula 3 — the floor: if either formula produces less than a fixed amount, commonly $25, you owe the floor instead. On $5,000 at 24% APR the three give $150, $100, and — at small balances — $25. The flat 2% payment at 24% APR covers interest exactly and reduces your balance by $0.

Run your own numbers: Debt Payoff Calculator (Avalanche vs Snowball) — compare payoff orders on your own balances, rates and monthly payment.

The three formulas, stated precisely

  • Interest + percent of balance: Minimum = interest charged this billing cycle + (percentage × statement balance) + fees + any past-due amount. The percentage is most often 1%; some issuers use more. This is the most common structure among large issuers today.
  • Flat percentage of balance: Minimum = percentage × statement balance + fees + any past-due amount. The percentage is typically 2–4%. Interest is not added separately — it has to come out of that percentage, which is where this formula can fail (below).
  • The floor: Minimum = the greater of the formula result and the floor — commonly $25, sometimes $35. If your entire balance plus interest and fees is less than the floor, most issuers bill the full amount instead, so the card actually closes out.

Two add-ons apply to every structure: fees (late fees, annual fees billed that cycle) and past-due amounts are added to the minimum, so a missed month raises the next minimum by the missed amount plus the late fee. And the percentage in your agreement can change with notice — the formula on a card you opened years ago may not be the formula running today.

One balance, three minimums: $5,000 at 24% APR

At 24% APR, one month of interest on $5,000 is approximately $5,000 × 24% ÷ 12 = $100 (issuers actually accrue daily — see how credit card interest works — but the monthly figure is what the formulas are built around). The first minimum under each structure:

  • Interest + 1%: $100 interest + $50 (1% of $5,000) = $150. Principal falls by $50.
  • Flat 3%: 3% × $5,000 = $150. After $100 of interest, principal also falls by $50 — at this APR the two formulas coincide.
  • Flat 2%: 2% × $5,000 = $100. That is the interest, exactly. Principal falls by $0 — next month's balance, interest, and minimum are all unchanged.
  • The floor: not binding at this balance — but on a $400 balance at 24% APR, interest + 1% gives $8 + $4 = $12 and flat 2% gives $8, so the $25 floor is the minimum you actually owe.

The flat-2% case is not a rounding quirk: whenever a flat percentage is at or below APR ÷ 12, minimum-only payments never reduce the balance. The payment only starts working when the balance falls far enough for the floor to take over — which, at $0 of principal progress per month, it never does on its own.

Why minimum-only payments stretch for decades

Simulating each formula on $5,000 at 22% APR, month by month, with no new purchases:

  • Interest + 1%: first minimum $141.67 ($91.67 interest + $50 principal) — payoff in 230 months (about 19 years), about $8,100 in total interest.
  • Flat 3%: first minimum $150 — payoff in 205 months (about 17 years), about $7,014 in total interest.
  • Flat 2%: first minimum $100 — payoff in 968 months (over 80 years), $43,419 in total interest. Once the balance falls below $1,250 the $25 floor takes over, and $25 against ~$23 of monthly interest shaves about $2 of principal a month for decades.

That is the minimum-payment trap in one table: the formula is built so the payment shrinks with the balance, so the interest share stays high and the finish line keeps receding. Every structure also shares one feature — the minimum is recalculated from the new, lower balance each cycle, so paying exactly the minimum always means paying less next month.

How to find your card's formula

  • Cardholder agreement: look for the section titled "Minimum Payment" or "How We Calculate Your Minimum Payment." It states the structure, the percentage, and the floor in one or two sentences.
  • Your statement: federal rules require a minimum-payment warning box showing how long minimum-only payoff takes and what a higher fixed payment does — a direct readout of your formula's consequences on your balance.
  • Check each card separately: different cards — even from the same issuer — use different percentages and floors, and issuers can change the formula with advance notice.

Once you know the formula, the balance it runs on matters too: the statement balance the minimum is calculated from is also roughly the balance reported for credit utilization, so the same paydown moves both numbers.

The fix: freeze the payment, not the formula

You cannot change your issuer's formula, but nothing requires your payment to follow it down. Paying a fixed $200/month on the same $5,000 at 22% APR clears the balance in 34 months with $1,750 in interest — versus 230 months and about $8,100 under the interest-plus-1% minimum, and 968 months under flat 2%. The simplest version: note your first month's minimum, and keep paying at least that amount every month. Our avalanche vs. snowball calculator runs a fixed payment against minimums across all your cards at once, and the balance transfer analyzer prices whether a 0% promo beats paying in place.

Sources

  • Major U.S. issuers' cardholder agreements (Chase, Citi, Capital One, Bank of America, Discover, Wells Fargo), "Minimum Payment" sections: interest-plus-percentage, flat-percentage, and floor structures, with fees and past-due amounts added.
  • Consumer Financial Protection Bureau, credit card rules and consumer guidance: minimum-payment warning disclosures required on statements (12 CFR 1026.7(b)(12)), showing minimum-only payoff time and the cost of paying more.
  • Figmetric simulation: monthly interest at APR ÷ 12 on the declining balance, minimum recalculated each cycle per each formula, $25 floor — the same model as our minimum-payment trap guide, which it reproduces exactly (968 months, $43,419 on $5,000 at 22% APR, flat 2%).

The bottom line

Your minimum payment is a formula, not a suggestion: interest plus a percent, a flat percent, or a $25-ish floor, whichever your agreement specifies. Read the one sentence in your cardholder agreement that defines it, run what it does to your balance, and then set a fixed payment the formula cannot shrink. The formula's job is to keep your account current; getting out of debt is yours.

Run your numbers

Our free avalanche vs. snowball calculator compares minimum payments against any fixed payment you choose, across all your cards at once.

Open the Avalanche vs. Snowball Calculator →

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Frequently asked questions

How is a credit card minimum payment calculated?

Most issuers use one of three structures, stated in your cardholder agreement: (1) the month's interest plus a percentage of the balance, commonly 1%; (2) a flat percentage of the balance, commonly 2–4%; or (3) whichever of those applies, subject to a fixed floor, commonly $25. Fees and past-due amounts are added on top. On a $5,000 balance at 24% APR, the interest-plus-1% formula gives $100 of interest + $50 = a $150 minimum; a flat 2% formula gives $100 — which covers that month's interest exactly and reduces the balance by $0.

What is the interest-plus-1% minimum payment formula?

Minimum = interest charged this cycle + 1% of the balance (some issuers use a higher percentage), plus any fees and past-due amounts, subject to a floor such as $25. Because the interest is paid first and a fixed slice of principal always comes off, this structure always makes progress: on $5,000 at 22% APR, minimum-only payments clear the balance in 230 months (about 19 years) with about $8,100 in total interest — slow, but finite.

Why can a flat-percentage minimum never pay a card off?

If the flat percentage is at or below the month's interest rate, the payment never touches principal. At 24% APR the monthly interest rate is 2% of the balance, so a flat 2% minimum pays interest only and the balance stands still. Even above the interest rate it is slow: a flat 2% minimum on $5,000 at 22% APR takes 968 months — over 80 years — and $43,419 in interest, because the payment shrinks every month as the balance falls.

What is the minimum payment floor?

The floor is a fixed dollar minimum — commonly $25, sometimes $35 — that applies whenever the formula produces less. On a $400 balance at 24% APR, the interest-plus-1% formula gives $12 and a flat 2% formula gives $8, so the $25 floor is what you actually owe. If the full balance (plus interest and fees) is less than the floor, most issuers bill the full balance instead.

How do I find which formula my card uses?

Your cardholder agreement has a section usually titled 'Minimum Payment' or 'How We Calculate Your Minimum Payment,' and many statements print the formula or a minimum-payment warning box showing how long minimum-only payments take. Issuers can change the formula with notice, and different cards from the same issuer often use different structures — check each card separately.

How do I pay a card off faster than the formula?

Fix the payment instead of letting it shrink. On $5,000 at 22% APR, paying a fixed $200/month — roughly the first month's interest-plus-1% minimum, held constant — clears the balance in 34 months with $1,750 in interest, versus 230 months and about $8,100 paying the shrinking minimum. The trick is simply to keep paying the first month's amount after the required minimum falls below it.

Last updated: October 25, 2026