Interest makes payment size disproportionately important
Credit-card interest is normally charged against the outstanding balance. A larger payment reduces principal sooner, which reduces the balance used for later interest calculations. The benefit is therefore more than the extra amount paid in a single month.
A 6,000 balance at 22% APR
Using a simplified monthly-interest model, paying 200 a month clears a 6,000 balance in approximately 44 months and produces about 2,791 of interest. Paying 300 a month clears it in approximately 26 months with about 1,543 of interest.
| Monthly payment | Estimated payoff time | Estimated interest |
|---|---|---|
| 200 | 44 months | 2,791 |
| 300 | 26 months | 1,543 |
The extra 100 a month reduces the modelled repayment period by roughly 18 months and interest by about 1,248. Actual statements can differ because cards may calculate interest daily, apply different rates to purchases and cash advances, charge fees or receive transactions during the payoff period.
Start with a payment the budget can repeat
An aggressive payment that leaves no allowance for food, utilities or an emergency can be self-defeating if the next unexpected cost returns to the card. First protect essential bills and stop adding new spending where possible. Then choose a fixed payment above the minimum and automate it soon after income arrives.
Minimum payments can move
A minimum may be calculated from a percentage of the balance, interest and fees, or a stated cash floor. As the balance falls, the required minimum can fall too. Continuing to pay the original fixed amount rather than following the declining minimum can materially shorten repayment.
When to consider a balance transfer
A promotional transfer can reduce interest, but compare the transfer fee, promotional period, required payment and rate after the offer ends. A 0% headline rate is not cost-free if the fee is large or the balance remains when the promotion expires. New purchases may also receive different treatment.
A practical payment test
- Enter the current statement balance and purchase APR.
- Use the regular payment you can sustain.
- Record the estimated time and interest.
- Increase the payment in realistic steps such as 25, 50 or 100.
- Keep an emergency buffer outside the card.
- Confirm settlement figures and promotional rules with the issuer.
If payments no longer cover interest or essential living costs, the issue requires more than a calculator. Contact the issuer promptly and seek reputable, country-appropriate debt guidance. Delaying contact can reduce the available options.
Related calculators
Sources and review notes
Examples were independently calculated using the assumptions shown. Regional limits were checked against the official sources below on 5 August 2026.
This guide is educational information, not personal financial, investment, tax or legal advice.