Why the payoff order matters
If you're carrying more than one balance, you're already making a decision about which one gets your extra money — even if you've never framed it that way. Every method pays the minimum on everything each month. The only real question is where the additional dollars go.
That single choice determines both how long you'll be paying and how much interest you'll hand over along the way. It's also the one variable you fully control, which is why it's worth an hour of attention before you start.
Snowball vs avalanche, plainly
The snowball method sends every extra dollar to your smallest balance, regardless of interest rate. You clear individual accounts faster, which means fewer bills, visible progress, and an early sense that the plan is working.
The avalanche method sends extra dollars to your highest interest rate first. This is mathematically optimal — it always pays equal or less total interest than any other ordering, because you're attacking the debt that grows fastest.
The tension between them is real, and it isn't a math problem. Avalanche wins on paper. Snowball wins on follow-through for a lot of people, because a plan you abandon in month seven saves nothing at all. The comparison calculator shows you both outcomes with your actual numbers, so the gap between them stops being theoretical. Sometimes it's a few hundred dollars and the motivational argument wins easily; sometimes it's thousands and that changes the calculus.
Both methods share the same accelerating effect. When a debt is cleared, its minimum payment doesn't return to your budget — it rolls into the extra amount attacking the next debt in line. Your payoff power grows every time you finish one, while your total monthly outlay stays flat.
Why minimum payments barely move the balance
Credit card minimums are typically calculated as a small percentage of your balance plus accrued interest — often around 1% of principal. That structure is designed to keep the account current, not to retire the debt.
The arithmetic is unforgiving. With average credit card APRs on interest-bearing accounts sitting above 20% through 2026, a balance near the US average of roughly $6,500 to $6,700 can take well over a decade to clear on minimums alone, with total interest approaching or exceeding the original balance. Analyses using current Federal Reserve rate data show payoff timelines stretching past 90 monthly billing cycles even at payment levels well above the required minimum.
This is why the extra payment calculator tends to surprise people. Because every additional dollar goes entirely to principal, it stops accruing interest for every remaining month of the loan. A modest, consistent extra amount frequently cuts years off a payoff and saves multiples of itself in interest.
Before you start
Gather the current balance, APR, and minimum payment for every debt. Your statements or online account will have all three. Accuracy matters more than speed here — an APR that's off by five points changes the recommended ordering.
Decide what you can genuinely add each month, and be conservative. A plan built on an extra amount you can actually sustain beats an aggressive one you abandon after two months. Many people also keep a small emergency buffer before attacking debt hard, so an unexpected expense doesn't go straight back onto a card.