Debt avalanche vs snowball: which saves more interest?
With the same monthly budget, the debt avalanche, which sends extra money to the highest interest rate first, usually costs less in total interest than the debt snowball, which sends it to the smallest balance first. How much less depends on how far apart your rates are, how large the high-rate balances are, and how much you pay above the minimums. The gap can be hundreds of dollars, a few dollars, or nothing at all when both methods happen to pick the same order.
This guide explains where the difference comes from, runs one hypothetical set of debts at several budgets, and shows the cases where the choice barely matters. If you are new to the two methods, our step-by-step guides to the snowball and the avalanche explain each one first.
Why the avalanche usually costs less
Every month, each debt charges interest on the balance that is left. Both methods pay every minimum on time and spend the same total budget. The only thing that changes is where the money above the minimums goes.
The avalanche sends it to the debt with the highest APR, so the most expensive balance shrinks first and the interest it charges falls fastest. The snowball sends it to the smallest balance, which may carry a lower rate. While that happens, the higher-rate balances only get their minimums, stay larger for longer, and keep charging more interest. When a debt is paid off, both methods roll its minimum payment into the next target, so the difference comes almost entirely from the order.
What decides how big the difference is
- The gap between your rates. If every debt has a similar APR, the order changes little. The wider the gap between the highest and lowest rates, the more the order matters.
- Where the high-rate debt sits. If your highest-rate debt is also your smallest, both methods pick it first. The difference grows when a large balance carries the highest rate, because the snowball leaves it for later.
- Your budget above the minimums. The extra money is what gets directed by the method. More extra money speeds up both plans and shortens the time the order has to make a difference.
- How long the plan runs. A longer plan gives the high-rate balance more months to charge interest under the snowball.
Worked example: one set of debts, two orders
The examples use a hypothetical household with four debts totaling $21,000, minimum payments of $630 a month, and a budget of $900 a month for debt, which leaves $270 a month above the minimums. These are made-up numbers, not typical rates or balances.
| Debt | Balance | APR | Minimum payment |
|---|---|---|---|
| Store card | $1,200 | 19.9% | $35 |
| Credit card | $6,500 | 24.9% | $195 |
| Personal loan | $3,500 | 11% | $110 |
| Car loan | $9,800 | 7% | $290 |
Running these debts through the same math as our calculator gives:
| Snowball | Avalanche | |
|---|---|---|
| Debt-free in | 28 months | 27 months |
| Total interest | $3,564.79 | $3,088.84 |
| First debt paid off | Store card, month 5 | Credit card, month 17 |
| Payoff order | Store card (month 5), Personal loan (month 13), Credit card (month 23), Car loan (month 28) | Credit card (month 17), Store card (month 19), Personal loan (month 22), Car loan (month 27) |
The avalanche saves $475.95 in interest and finishes 1 month sooner. The snowball spends its first months on the $1,200 store card, while the $6,500 credit card at 24.9% keeps charging the highest rate in the list. The avalanche attacks that card first, which is where most of the difference comes from.
How the budget changes the gap
Running the same four debts at different monthly budgets shows that the dollar gap does not simply grow or shrink with the budget. It rises, then falls as larger budgets shorten both plans.
| Monthly budget | Snowball interest | Avalanche interest | Avalanche saves |
|---|---|---|---|
| $730 | $4,997.23 | $4,538.62 | $458.61 |
| $900 | $3,564.79 | $3,088.84 | $475.95 |
| $1,000 | $3,063.27 | $2,636.62 | $426.65 |
| $1,500 | $1,840.79 | $1,581.24 | $259.55 |
At $1,500 a month, both plans finish in 16 months, and the avalanche still costs $259.55 less. At $730 a month, the snowball takes 36 months and the avalanche 35 months. Paying more each month cut the interest of either method far more than the choice of method did.
When both methods give the same result
If the smallest balance also has the highest rate, and the order continues that way down the list, the two methods choose the same order and give identical results. For example, take three hypothetical debts: Card A: $900 at 26.9%, $30 minimum; Card B: $4,200 at 21.9%, $105 minimum; and Loan: $7,500 at 9.5%, $180 minimum, with a budget of $600 a month. Both methods pay them off in the order Card A (month 3), Card B (month 14), Loan (month 24), finish in 24 months, and charge $1,716.20 in interest, a difference of $0.00.
When every debt is at 0%, there is no interest to save, so the order cannot change the total cost either. In both cases, the choice is about preference rather than money.
Interest is not the only difference
In the main example, the avalanche finishes 1 month sooner, but the snowball pays off its first debt much earlier: the store card in month 5, compared with the credit card in month 17 for the avalanche, 12 months apart. That early payoff can matter to some people, because it removes a bill and a minimum payment sooner. Our guide on when the snowball beats the avalanche looks at that trade-off.
Both methods also beat paying only the minimums by a wide margin. In the example, paying only the minimums on each debt, without rolling freed-up payments forward, takes 58 months and costs $7,064.93 in interest. Against that, the snowball saves $3,500.14 and 30 months, and the avalanche saves $3,976.09 and 31 months.
Common questions
Is the avalanche always cheaper?
It usually costs the same or less with the same budget, because it sends extra money to the highest rate first. The difference can be large or close to zero, so it is worth running your own debts through the calculator.
Does the avalanche also finish sooner?
Often by about a month, as in the example, but not always. At some budgets, both methods finish in the same month and differ only in interest.
Which method should I use?
That is your decision. The avalanche usually costs less, while the snowball clears individual debts sooner. Either one, followed consistently, beats paying only the minimums in the examples above.
The takeaway
The avalanche usually saves more interest because it pays down the most expensive balance first. How much it saves depends on your rates, balances, and budget, and when the methods pick the same order, they tie. Paying more each month changes the total far more than the choice of method, so compare both with your own numbers.
This guide is educational only and is not financial, tax, or legal advice. The example uses hypothetical numbers; your lender or card issuer sets your actual terms. See how our calculators work.
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