Debt snowball vs avalanche: which saves you more?
Four debts, $20,000, same $640 budget, both methods at once. The avalanche finishes one month sooner and costs $378.77 less in interest. The snowball's first closed account comes at the same time here, so the question is pure dollars. Change the extra payment and the gap moves with it.
Head-to-head comparison · one entry, two plans · free, always
The verdict on this $20,000 example =
$378.77 cheaper: avalanche
Snowball: 40 months, $5,289.10 interest. Avalanche: 39 months, $4,910.33 interest.
4 debts · $640/mo ($440 minimums + $200 extra)
| Snowball | Avalanche | |
|---|---|---|
| Debt-free | 40 months | 39 months |
| Total interest | $5,289.10 | $4,910.33 |
| Payoff order | Card A, Loan, Card B, Card C | Card A, Card B, Card C, Loan |
| First account closed | Month 19 | Month 19 |
| The gap | $378.77 more under the snowball | |
| Debt | Balance | APR | Minimum |
|---|---|---|---|
| Card A | $4,500.00 | 25% | $99 |
| Card B | $5,500.00 | 21% | $121 |
| Card C | $5,500.00 | 9% | $121 |
| Loan | $4,500.00 | 6% | $99 |
Try it: your extra payment, both methods
When the gap matters, and when it doesn't
The gap is the price of momentum. When your APRs are spread wide, as here (25% down to 6%), the avalanche keeps $378.77 and finishes a month early, because it aims the extra at the rate that bleeds fastest. On a $40,000 portfolio with that kind of spread, the same logic scales to $2,500–$4,800. When the rates sit close together, say everything between 18% and 22%, the gap collapses toward zero and the snowball's quicker first win is nearly free. The page exists because both answers are right for different households.
There is also the hybrid, which most counselors quietly recommend: kill one small debt first for the psychological win, then switch to the avalanche for the rest. You get the closed account and most of the interest savings. The ledger above is the raw material for that decision; the behavioral part is yours to call.
The honest summary line from every study of these plans: the best method is the one you finish. A $378.77 gap is real money, but it is nothing next to a plan abandoned in month 8. If the snowball's order is the order you will actually keep feeding, take it and do not look back.
Educational estimates, not financial advice. Interest accrues monthly at balance × APR ÷ 12; minimums and rates assumed constant. Talk to a licensed professional before acting on these figures.
Common questions
Which is better, debt snowball or avalanche?
The avalanche costs less interest; the snowball delivers an early win that research links to finishing the plan. On the example above the avalanche saves $378.77 and finishes a month sooner.
Can I switch methods halfway through?
Yes, and it is the smart move more often than not: take one quick snowball win for momentum, then run the avalanche on the remainder for the interest savings.
Does the avalanche ever take longer than the snowball?
Rarely. Because it kills expensive interest first, it usually finishes first or tied. Above: avalanche 39 months, snowball 40.
What if my rates are all about the same?
Then the gap is near zero and the snowball is the obvious pick: same cost, faster first win. The methods only diverge when rates spread wide.
Is the snowball bad advice?
No. A method you finish beats a method you abandon in month 8. The $378.77 gap on this example is real, but a completed snowball beats an abandoned avalanche every time.
Next from the ledger
Debt snowball calculator: the snowball as a full planner with per-debt kill dates
Pay off $10,000 in credit card debt: what one fixed payment does to a big single balance
Debt Payoff Calculator: run both plans on your own debts