Avalanche vs Snowball: We Ran the Numbers, and the Gap Is Smaller Than You Think

When you owe money on several accounts at once, you have to choose an order. Two methods dominate the advice, and people argue about them with more heat than the numbers justify.

The two methods

Debt avalanche. Pay the minimum on everything, then put every spare dollar against the debt with the highest interest rate. When it clears, move to the next highest.

Debt snowball. Pay the minimum on everything, then put every spare dollar against the debt with the smallest balance, regardless of rate. When it clears, move to the next smallest.

Avalanche targets the most expensive debt. Snowball targets the one that will disappear soonest.

Why avalanche wins on arithmetic

Interest accrues on balances at their own rates. A dollar aimed at a 24.99% balance prevents more future interest than the same dollar aimed at a 7.49% balance. Avalanche therefore always produces a total interest cost less than or equal to any other order, including snowball. That is not a claim about typical cases; it follows from the arithmetic.

The interesting question is not which one wins. It is by how much.

What the difference is worth

Take three debts, which is a realistic spread for a household carrying a card balance, a small personal loan and a car loan:

• Card: $9,000 at 24.99%
• Personal loan: $2,500 at 10.99%
• Car loan: $14,000 at 7.49%

Assume $900 a month total towards all three, with minimums of $225, $50 and $280.

Avalanche (card, then personal loan, then car) clears everything in 34 months with about $4,473 in total interest.

Snowball (personal loan, then card, then car) clears everything in 34 months with about $5,063 in total interest.

Avalanche saves roughly $591, and both finish in the same month.

That is a real saving and worth having. It is also not the difference between solvency and ruin, which is roughly how the debate is usually framed. On smaller balances the gap narrows further: with a few thousand dollars spread across three accounts, the difference can be under $20.

You can model your own combination with our loan calculator, running each debt separately to see what different payment levels do to the interest total.

Why snowball still makes sense for some people

The avalanche advantage assumes you keep going for 34 months. That assumption is doing a lot of work.

Snowball produces a cleared account sooner, and a cleared account is visible evidence the plan works. If the highest-rate debt is also the largest, avalanche can mean a year or more with nothing obviously changing, which is where plans get abandoned. A method you complete beats a method you quit, and the completed snowball beats the abandoned avalanche by far more than $591.

So the honest framing is: avalanche is optimal on paper, snowball is optimal if it is the reason you finish.

What both methods require

Neither works without these:

• Minimums paid on every account, every month. Missing one adds late fees and can damage your credit, which costs more than any ordering decision saves
• No new balances added. Both methods assume the debts are shrinking, and adding to them changes the problem entirely
• A fixed monthly total. The methods only differ in how spare money is directed, so there has to be spare money to direct

The thing that matters more than the order

The size of the monthly payment dwarfs the ordering choice. Adding $100 a month to the total in the example above changes the outcome far more than switching methods does. So does lowering the rate on the most expensive balance, which is what a balance transfer is for.

Pick whichever order you will actually stick to, and then spend your energy on the payment amount rather than the sequence. The sequence is a rounding error next to the commitment.

Sources

• CFPB: Credit cards
• CFPB: How does my credit card company calculate the amount of interest I owe?
• CFPB: What is a personal loan?

Current as of August 2026. Balances, rates and payment figures are illustrative examples used to show the arithmetic, not offers. Totals were computed with monthly compounding.