Credit card payoff with extra payments calculator

Key takeaway: Because interest is charged on your balance before your payment lands, every dollar of extra principal you pay down stops accruing interest for every remaining month of the payoff — which is why a modest, consistent extra payment can be worth far more than its face value over time.

Why split minimum and extra instead of just raising the payment?

Most payoff calculators treat your payment as one number. This one separates it into two, because that's how the decision actually gets made: your minimum is fixed by your issuer, but your extra is the dial you control. Splitting them lets the built-in comparison show you, in months and dollars, exactly what dialing that extra up or down is worth — rather than making you re-run the numbers by hand each time.

How much does an extra payment really save?

The earlier in the payoff an extra dollar lands, the more it saves, because it stops compounding interest against you for the rest of the schedule — not just this month. That's why a $50/month extra payment on a multi-thousand-dollar balance often cuts a year or more off the timeline and saves hundreds of dollars, disproportionate to the $50 itself. If you'd rather see the payoff without splitting out an extra amount, the standard payoff calculator treats payment as a single number instead.

How we calculate this

We add your extra payment to your required minimum to get one combined monthly payment, then run the same declining-balance amortization as the standard calculator: interest accrues on the balance, the combined payment is applied, and whatever's left after interest reduces principal — repeated until the balance reaches $0.

Frequently asked questions

Should I set my "minimum payment" here to my issuer's actual required minimum?

Yes — enter the dollar amount your statement lists as the required minimum, then put whatever you can realistically add on top in the extra payment field. Splitting them this way is what lets the comparison isolate the extra dollar's impact.

Is it better to make one extra payment or add it to my regular payment?

For interest purposes it doesn't matter whether the extra arrives as a separate payment mid-month or folded into one larger monthly payment — what matters is the total principal-reducing amount that lands before interest accrues the following month.

What if I can only afford a small extra payment some months?

Any extra, even inconsistent, helps — the calculator assumes a fixed extra every month to give you a clean estimate, but every dollar you add in any given month permanently reduces the balance interest is calculated on afterward.

Sources

• Consumer Financial Protection Bureau, Credit cards