Both methods do the same thing: pay minimums everywhere, throw everything extra at one card, then roll that payment into the next. They differ only on which card goes first, and that difference has been argued about far past its practical importance.
The two methods
Avalanche orders your debts by interest rate, highest first. Every extra dollar attacks the most expensive balance, which minimizes total interest paid.
Snowball orders by balance, smallest first. The first card clears sooner, freeing its minimum payment and producing visible progress early.
A worked comparison
Four balances, $9,300 total, minimums of $250, with $400 a month available.
| Card | Balance | APR | Minimum |
|---|---|---|---|
| Card A | $600 | 18.99% | $25 |
| Card B | $2,200 | 26.99% | $60 |
| Card C | $3,500 | 21.49% | $85 |
| Card D | $3,000 | 24.99% | $80 |
| Method | Order | Time to clear | Total interest |
|---|---|---|---|
| Avalanche | B, D, C, A | About 30 months | Around $2,500 |
| Snowball | A, B, D, C | About 31 months | Around $2,650 |
The avalanche saves roughly $150 and about a month. These figures are illustrative and will vary with the specific numbers, but the pattern is consistent: the gap is real and usually small.
When the gap gets larger
The avalanche advantage grows when the rate spread across your cards is wide, and when the highest-rate card also has a large balance. If one card is at 29% with $6,000 and another is at 14% with $500, paying the small one first is genuinely expensive.
In that situation, a hybrid works: clear the small balance for the psychological win if you need one, then switch strictly to avalanche order.
Choosing
Consider it if
- Avalanche: lowest total interest and usually the fastest
- Avalanche: clearly correct if you are motivated by the arithmetic
- Snowball: a completed card sooner, which sustains momentum
- Snowball: fewer accounts to track as you go
Think twice if
- Avalanche: the first target can take many months, which tests resolve
- Avalanche: no early sense of progress
- Snowball: slightly more interest
- Snowball: can feel arbitrary if the smallest balance is also the cheapest
What matters more than the method
- Stop adding to the balances. Neither method works against continued spending.
- Roll every freed-up payment forward. Keep the total monthly payment constant as cards clear.
- Find more money to apply. An extra $100 a month changes the outcome more than the method choice does.
- Consider lowering the rate through a balance transfer or a personal loan.
- Keep going. Completion is the variable that dominates everything else.
Pick one this week and start. The comparison is interesting; the delay it causes is not.
