How is minimum payment calculated on a credit card? There is no single national formula. Each card issuer sets its own, and it is written in the card agreement. Most formulas take one of three shapes: a percentage of the balance, a percentage of the balance plus that month's interest and fees, or a fixed dollar floor that applies when the percentage comes out too small. Past-due amounts and any amount over the credit limit can be added on top. The statement then shows the result as one number, which is why it can look like it came from nowhere.
Where this applies: consumer credit cards issued in the United States. The federal rules quoted below are from Regulation Z and from guidance by the US bank regulators.
This article explains how a statement figure is built. It is general information, not financial or legal advice.
The three shapes a minimum payment formula takes
Chase's education page "How to Calculate Your Minimum Credit Card Payment," read on September 25, 2026, describes the three common methods across the industry. Each one is worth knowing because the statement never labels which one it used.
1. A percentage of the balance
The issuer takes a set percentage of the statement balance, and that is the minimum. Chase's page says this percentage "typically falls within the range of 1% to 3%." Under this method the interest and fees are already inside the balance being multiplied, so they are part of the percentage rather than added separately.
2. A percentage of the balance, plus interest and fees
The issuer takes a smaller percentage of the balance and then adds the full interest charge and any fees from that billing cycle. Chase's page describes this as "the sum of the interest accrued on the outstanding balance for the billing period plus a percentage of the outstanding balance." Because the whole month's interest is added on top, this shape always covers the interest, and the percentage part reduces what is actually owed.
3. A fixed dollar floor
Some issuers set a flat minimum, such as the examples Chase lists of "$25, $35 or another predetermined amount." In practice the floor is usually combined with one of the percentage methods: the minimum is whichever is greater. When the whole balance is smaller than the floor, the minimum is normally the whole balance.
One real issuer's formula, as published
To show how these pieces combine, here is the formula Chase publishes for its own cards, on the same page read on September 25, 2026:
"Chase calculates your minimum payment as a flat fee of $40 or 1% of your statement balance, plus any interest and late fees since the last billing cycle"
The page finishes that sentence by saying the minimum is whichever of those two amounts is greater. It also says: "If your balance is less than $40, your minimum payment is the total of your balance."
That is shape 2 with a shape 3 floor. It is quoted here only as a published example of how a formula reads. Other issuers use different percentages and different floors, and an issuer can change its terms, so the formula for any specific card is the one in that card's own agreement.
What can be added on top of the formula
The formula produces a base figure. Two other amounts are commonly added to it, and they explain most of the months when the minimum suddenly jumps.
- A past-due amount. If last month's minimum was not paid in full, the unpaid part is usually added to this month's minimum.
- An over-limit amount. If the balance is above the credit limit, many issuers add the amount over the limit.
Late fees appear too, but in shape 2 they are already part of the formula, since fees are added along with interest. Checking whether a payment counted as on time is its own question; when a payment is actually late walks through the different clocks involved.
A worked example with invented numbers
The numbers below are invented for illustration. They do not describe any real card's rates or formula. Assume a card whose agreement says the minimum is "the greater of $35, or 1% of the balance plus interest and fees."
| Line on the statement | Amount |
|---|---|
| New balance | $1,500.00 |
| Interest charged this cycle | $25.00 |
| Fees charged this cycle | $0.00 |
Percentage part: 1% of $1,500.00 = $15.00 Add interest and fees: $15.00 + $25.00 + $0.00 = $40.00 Compare with the floor: $40.00 is greater than $35.00, so the minimum is $40.00.
Now change one thing: the balance is $400.00 and the interest is $7.00. The percentage part is $4.00, plus $7.00 of interest, which is $11.00. That is below the $35.00 floor, so the minimum becomes $35.00. Same card, same formula, but a different piece of it decided the answer.
The interest figure is the part most people cannot predict, because it is calculated from the daily balances during the cycle, not from the balance printed at the end. The average daily balance method shows where that number comes from.
Why the formula usually covers the interest
This is the part most explanations leave out. Minimum payment formulas are not only an issuer's commercial choice. US bank regulators have said what they expect them to do.
In January 2003, the OCC, the Federal Reserve, the FDIC and the Office of Thrift Supervision issued joint guidance titled Credit Card Lending: Account Management and Loss Allowance Guidance, read on September 25, 2026. Its section on minimum payments describes the problem when "minimum payments consistently fall short of covering all finance charges and fees assessed during the billing cycle and the outstanding balance continues to build." It calls that "negative amortization."
It then states: "The Agencies expect lenders to require minimum payments that will amortize the current balance over a reasonable period of time." Amortize means pay down gradually, and how amortization works explains the idea in detail for loans.
The arithmetic behind that concern is simple. A flat percentage that is smaller than the month's interest would leave some interest unpaid, and the balance would grow even with every minimum paid. Formulas that add the month's interest on top of a percentage, like shape 2, are built so that cannot happen: the interest is paid first, and the percentage part reduces the balance.
The warning box printed next to the minimum
Most card statements carry a second box close to the minimum payment, and it is required by federal rule. The CFPB's published text of Regulation Z, section 1026.7(b)(12), read on September 25, 2026, requires card issuers to print this sentence:
"Minimum Payment Warning: If you make only the minimum payment each period, you will pay more in interest and it will take you longer to pay off your balance."
Alongside it, the rule requires an estimate of how long the current balance would take to repay with only minimum payments, an estimate of the total cost, and a toll-free number for information about credit counseling. In many cases the statement also shows the monthly payment that would clear the balance in 36 months, with its total cost and the estimated savings. The rule lets issuers leave the 36-month figures out in some situations, for example when paying the minimum would already clear the balance in about three years or less.
These estimates are the issuer's own calculation for that one statement, using that card's formula. They are the most direct way to see what the minimum payment formula means over time. The long-run arithmetic of paying only that figure is covered in the minimum payment trap.
How to find the formula for a specific card
The minimum payment formula sits in the card agreement, usually in a section titled something like "Minimum Payment" or "Payments." Issuers typically make the agreement available in the online account or on request.
With the formula in hand, the check takes four numbers from one statement: the new balance, the interest charged, the fees charged, and any past-due amount. Put them into the formula, compare the result against any floor, and it should match the box. If it does not, the difference is usually a past-due or over-limit amount, or a promotional balance treated differently under the agreement. A figure that still cannot be explained is something the issuer can be asked to clarify.
Frequently asked questions
Is the minimum payment the same percentage on every card?
No. Each issuer sets its own formula in the card agreement. Chase's education page, read on September 25, 2026, says percentage-based formulas typically fall in the range of 1% to 3%, and many cards combine a percentage with a fixed dollar floor.
Why can a minimum payment go up without any new spending?
Common causes are a higher interest charge that cycle, a fee added under a formula that includes fees, an unpaid amount from last month being added, or a balance above the credit limit. Comparing this statement's interest, fees and past-due lines with last month's usually shows which one changed.
Does the minimum payment include interest?
Under most formulas, yes. Either the interest is inside the balance that the percentage is applied to, or the month's interest is added on top of a percentage. US bank regulators' 2003 guidance expects minimum payments to pay down the balance over a reasonable period rather than let it grow.
What is the Minimum Payment Warning on a statement?
It is a box required by Regulation Z that states paying only the minimum means paying more interest over a longer time. It also shows the issuer's estimate of how long repayment would take at the minimum and what it would cost in total.