Key takeaways
- Keeping the same total monthly budget as cards are paid off — rolling each freed-up minimum into the next card — is what makes the plan fast.
- The highest-APR-first order (avalanche) costs the least interest; smallest-balance-first (snowball) gives earlier wins.
- In this example, $150 extra a month cuts the payoff time from 66 to 38 months.
Why extra money matters so much
With the four example cards ($4,200 at 27.99%, $2,600 at 22.49%, $6,800 at 19.99% and $1,100 at 29.99%) the minimums add up to $400 a month. Paying exactly that total, and rolling each paid-off card's minimum into the others, clears everything in 66 months with $11,671 of interest. Adding $150 a month cuts that to 38 months and $5,834 — saving about $5,837 and more than two years.
Which card first?
The calculator shows two orders. Avalanche sends extra money to the highest APR first, here the 29.99% card, then the 27.99% card. Snowball targets the smallest balance first. In this example both finish in 38 months, and avalanche saves $179. See the snowball vs avalanche calculator for a case where the gap is bigger.
Ways to speed it up
A 0% balance transfer card can pause interest for a promotional period, but usually charges a transfer fee and requires good credit. Asking issuers for a lower APR sometimes works. Avoid adding new charges to cards you are paying down, or the plan will not hold.
Worked example
Total minimums are $120 + $75 + $170 + $35 = $400; with $150 extra the monthly budget is $550. Each month interest is added to every card, every minimum is paid, and the rest goes to the target card. The avalanche order finishes in 38 months with $5,834 interest; snowball also takes 38 months, with $6,013.
Methodology and sources
The plan is simulated month by month. Monthly interest is the APR ÷ 12 times each balance. Every card gets its minimum (or the balance if smaller), and the remaining budget goes to cards in payoff order. The total monthly budget stays constant, so freed-up minimums roll forward. Card issuers calculate interest on the average daily balance, so results are close estimates.
Sources: CFPB – Credit cards
Frequently asked questions
Should I pay off the card with the highest balance or highest interest?
Highest interest first (avalanche) saves the most money. Smallest balance first (snowball) can help motivation. Both work if you stick with them.
Should I close cards after paying them off?
Not necessarily. Closing a card reduces your available credit, which can raise your credit utilization and affect your score. Keeping it open with no balance is often better.
Is debt consolidation better?
A consolidation loan or balance transfer can help if the new rate is clearly lower and you stop using the cards. Compare all fees first.
What if I can only pay minimums?
Set the extra payment to 0. As long as the minimums exceed the interest, you will still see a payoff date.
Results are estimates for educational purposes and are not financial advice.