How To Calculate Minimum Payments

A minimum payment is the smallest amount a card issuer will accept each month without marking the account delinquent. It is set as the greater of a percentage of the balance or a flat floor, so on small balances the floor applies and on large ones the percentage does.

The percentage is usually between one and three percent of the statement balance. It sounds modest, but at two percent on a high-APR card the payment can be barely above the monthly interest, which is why the balance appears frozen.

The flat floor exists so that a tiny balance still produces a payment worth processing. It is typically twenty-five to thirty-five dollars, and it only binds when the percentage would produce less.

The monthly interest is the balance multiplied by the APR and divided by twelve. Comparing it with the minimum shows how much of the payment is consumed before any principal is repaid, which is the single most useful comparison on a card statement.

If the payment equals the interest, the balance never falls. That is the mathematical trap of the minimum: the account stays current while the debt is effectively permanent, which is why the payoff time is often described as never.

If the payment exceeds the interest, the balance falls by the difference each month, and the payoff time can be worked out with the standard amortisation formula rearranged for the number of periods.

Adding even a small extra payment has an outsized effect. Because the formula is non-linear, an extra twenty or thirty dollars a month can cut years off the payoff, which is why the extra payment field matters more than it looks.

The payoff estimate in this calculator assumes the payment stays at the first month's minimum. In reality the percentage minimum falls as the balance falls, which makes the real payoff longer than the estimate.

A fixed payment larger than the minimum avoids that drift entirely. Choosing a round figure such as two hundred dollars a month makes the payoff predictable and usually much faster.

The total interest is the number that makes the trap concrete. On a three thousand dollar balance it can approach or exceed the original debt, meaning the cardholder pays for the purchase twice.

Paying the statement balance in full each month avoids interest altogether, provided the grace period applies. The minimum only matters to those already carrying a balance.

The order in which a payment is applied matters more than it sounds. Issuers typically apply the payment to interest, fees and the lowest-rate balances first, which means a promotional balance can sit untouched while a standard-rate balance is repaid. Reading the allocation rules in the agreement explains why a balance sometimes falls more slowly than expected.

Reviewing the statement each month for the split between interest and principal is a simple habit that changes behaviour. When the interest line is close to the payment line, the account is barely moving, and that is the moment to increase the payment rather than wait for a better month.

The calculator models the figures entered and nothing more. It does not know the issuer's exact rounding, the order in which payments are applied or any promotional rate. Treat the output as an estimate and confirm against a statement.