Avalanche or snowball: Which debt payoff method wins?

The avalanche method, paying the highest APR first, costs the least interest. The difference can be much smaller than its reputation suggests: with three typical debts and an extra $500 a month, our calculation puts the avalanche ahead by $74.22, and both methods finish in the same month. The gap becomes large, $1,165.08 in our second example, when your highest-rate debt is also your biggest balance. In that case the math favors the avalanche clearly; otherwise, pick the order you will actually keep paying.

How each method orders your debts

Both methods start the same way. You pay the minimum on every debt, commit to a fixed total each month, and send everything above the minimums to one target debt. When the target is paid off, its whole payment rolls to the next target, so the amount aimed at the debt list never shrinks.

• Avalanche: the target is the debt with the highest APR, regardless of balance.
• Snowball: the target is the debt with the smallest balance, regardless of rate.

The only difference is the order. That is why the gap between them depends on how differently the two rules rank your particular debts.

The numbers on a typical debt list

Take three debts, with illustrative rates:

• A credit card with $4,000 at an APR of 22% and a $120 minimum
• A car loan with $9,000 left at an APR of 7.5% and a $280 payment
• A personal loan with $1,500 left at an APR of 12% and a $70 payment

On top of the $470 in minimums you add $500, for a fixed $970 a month. Computed month by month, here is how each order plays out:

The snowball costs $74.22 more. It stays close because the card is second in the snowball order anyway: the personal loan is gone in three months, and then the card gets the full extra payment. The last row is the real lesson. Adding $500 a month takes 35 months off the payoff and saves more than $2,400 in interest, over 30 times what the choice of method is worth here.

For comparison with the example rates, here are the Federal Reserve’s current averages, starting with the APR on credit card accounts that were charged interest:

22.36%Credit card APR, accounts paying interestAugust 2026 · FRED

The average rate on a 48-month new car loan at commercial banks:

7.47%New car loan APR, 48 monthAugust 2026 · FRED

And on a 24-month personal loan at commercial banks:

11.90%Personal loan APR, 24 monthAugust 2026 · FRED

When the gap gets big

Change one thing: make the high-rate card the largest balance on the list. Say you owe $12,000 on a card at an APR of 27% (minimum $390), $6,000 on a car loan at 6% ($230 payment) and $2,500 on a personal loan at 9% ($110 payment), and you pay a fixed $1,030 a month, $300 above the minimums.

• Avalanche: debt-free in 24 months, with $4,077.34 in interest.
• Snowball: 25 months and $5,242.42. The card waits behind the loan and the car for 14 months, collecting interest at 27% the whole time, and the snowball costs $1,165.08 more.

The gap grows with three things: how far the highest rate sits above the others, how large that balance is, and how many months the snowball makes it wait for its turn. When the expensive debt is also the biggest, the snowball puts it last, and every one of those conditions works against you.

Why the snowball still has a case

Paying off whole accounts seems to help people finish. A 2012 study in the Journal of Marketing Research by David Gal and Blakeley McShane looked at nearly 6,000 clients of a debt settlement company and found that the share of their accounts people had closed predicted whether they completed the program better than the share of dollars they had paid down. The authors noted that the two measures move together and are hard to separate, and the study shows an association among settlement clients, not proof that the snowball causes success.

So the practical question is what you are paying for motivation. In the first example, $74.22 over 17 months is a small price if closing an account in month 3 keeps you going. In the second, $1,165.08 is a large one.

A hybrid with a rule

You can take the early win without paying much for it. Clear a small debt first only if the target payment will wipe it out within about three months; after that, order the rest by APR.

In the first example, the personal loan meets the rule: $570 a month clears $1,500 in three months, and the whole detour costs $74.22. In the second, it does not. Sending $410 a month to the $2,500 loan takes seven months, and doing that before switching to the card costs $476.71 more than the pure avalanche, though $688.37 less than the full snowball.

To check the rule on your own list, put your smallest debt’s balance, its APR and the payment you would aim at it into the payoff calculator:

Before you choose an order

1. Fix the total first. The method only decides where the extra goes. A fixed total that does not fall as balances drop does most of the saving, as our debt payoff budget shows.
2. Rank by APR and by balance. If the two lists put the same debts near the top, the methods will end up close and you can choose on motivation. If your highest-rate debt is at the bottom of the balance list, run the numbers before choosing the snowball.
3. Look at lowering the rate itself. A balance transfer or a debt consolidation loan can cut the rate on the most expensive debt, which matters more than the order once the rate gap is wide.
4. Know the rule on a single card. If one card carries several balances at different rates, Regulation Z already sends anything above the minimum to the highest-rate balance first (12 CFR 1026.53), as our piece on the minimum payment explains.