Debt Snowball vs Debt Avalanche: Which Payoff Method Wins?
When you have several debts and a fixed amount to put towards them each month, the question is where the spare money should go. Two well-known approaches give different answers: the snowball attacks the smallest balance first, and the avalanche attacks the highest interest rate first.
Both rely on the same engine. You pay the minimum on every debt, put everything else on one target, and when that debt is cleared you move its whole payment to the next. The only difference is the order. This guide runs both on the same set of debts so you can compare the numbers rather than the slogans.
How each method works
- Snowball: list debts from smallest balance to largest and target the smallest first, ignoring interest rates. Quick wins come early.
- Avalanche: list debts from highest interest rate to lowest and target the highest rate first, ignoring balances. This minimises the interest charged.
Either way, the total you pay each month stays the same. When a debt is cleared, its minimum payment is not spent elsewhere; it joins the extra money and goes at the next target. That rolling effect is what makes the method work.
A worked example
Example: three debts and a total budget of 400 a month, which is 135 more than the minimums of 265.
| Debt | Balance | Interest rate | Minimum payment |
|---|---|---|---|
| Card A | 600 | 12% | 25 |
| Card B | 3,500 | 24% | 90 |
| Loan C | 7,000 | 8% | 150 |
Under the snowball, the 135 extra goes to Card A (the smallest balance) first. Under the avalanche, it goes to Card B (the highest rate) first. Running both month by month gives:
| Result | Snowball | Avalanche |
|---|---|---|
| First debt cleared | Card A, month 4 | Card B, month 19 |
| Second debt cleared | Card B, month 20 | Card A, month 20 |
| All debts cleared | Month 33 | Month 33 |
| Total interest paid | 1,913 | 1,825 |
The avalanche saves about 88 in interest, which is real but modest. The snowball clears its first debt in month 4, while the avalanche takes until month 19 to clear its first. Both finish in month 33. The avalanche's smaller interest bill shows up as a smaller last payment, about 125 against about 213 for the snowball, rather than as an earlier finish date.
That is worth keeping in perspective. Over nearly three years, the gap between the two plans is about 88, which is less than a single monthly minimum on Loan C. With wider rate gaps or larger balances the avalanche advantage grows, but the main driver is the steady total amount you commit each month, not the order in which the debts are cleared.
Choosing between them
The size of the gap depends on how different the interest rates are, and on how large the high-rate balance is compared with the others. If the highest rate is on a big balance, the avalanche pulls well ahead. If the rates are close, or the highest rate sits on the smallest balance, the two methods are almost the same or identical.
- Choose the avalanche if minimising interest matters most and you are comfortable waiting longer for the first debt to disappear.
- Choose the snowball if seeing debts vanish keeps you motivated, since a plan you follow beats a better plan you abandon.
- A hybrid is also reasonable: clear a very small balance first for the quick win, then switch to highest rate first.
In practice, consistency matters more than the order. Missing a minimum payment can trigger fees and extra interest that outweigh the small gap between the methods, so make sure every minimum is covered before anything else.
Run your own numbers
- List every debt with its balance, annual rate and minimum payment.
- Decide the total monthly amount you can commit, and keep it constant.
- Pay the minimum on every debt and send the rest to your chosen target.
- When a debt reaches zero, add its minimum to the extra money and move to the next target.
For instalment debts such as Loan C, the loan calculator shows the payment and total interest on its own schedule. For card balances, remember that interest keeps being added each month, which the compound interest calculator can illustrate if you leave a balance untouched.
Be careful with consolidation offers. A new loan can simplify payments, but compare its interest rate and any fees against what you pay now, and check the total cost over the full term, not only the monthly figure.
This article is general education about debt arithmetic and is not financial advice. A qualified adviser or a reputable non-profit credit counselling service can help you build a plan for your own situation.
- Loan Calculator: Enter the amount you want to borrow, the term, the interest rate and how often you will pay. You get the size of each payment, the total you will repay and the interest you will pay.
- Compound Interest Calculator: Enter a starting balance, an interest rate and a term to see how money grows when interest is added to the balance. Add regular deposits or withdrawals to model a savings plan.
This article is general information, not professional advice. See our Disclaimer and Editorial Policy.
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