Guides · Money foundations

Avalanche vs Snowball

One method saves more money. The other gets finished more often. Personal finance rarely offers a cleaner example of math losing to psychology, and the honest answer is that both sides have evidence.

Sources last verified 2026-07-16

Two orderings of the same plan

Both methods share the same structure: pay the minimum on everything, attack exactly one debt with all spare money, and when it clears, roll its freed-up payment onto the next target. They differ only in how you pick the target.

Avalanche targets the highest interest rate first. It mathematically minimises total interest — there is no arguing with this part.

Snowball targets the smallest balance first. It costs more interest, and it produces a finished debt sooner, which is the thing that keeps people going.

What the research actually found — both sides

This is a case where the honest answer is genuinely split, and it's worth stating both halves rather than picking a side.

Avalanche saves more money. That's arithmetic, not opinion. But research by Gal and McShane, published out of Kellogg, found that closing accounts smallest-balance-first was a better predictor of people actually eliminating their debt — the sense of completed progress sustains the effort.

So: a plan that saves 8% more interest and gets abandoned in month four saves nothing. The best plan is the one you finish, and knowing which of those two you are is the real decision.