Avalanche vs Snowball: Two Ways to Clear Debt

The avalanche wins on maths; the snowball wins on momentum. Both work — only if you stick with them.

Pay the minimum on every debt to stay current, then throw every spare dollar at one target. The question is which target, and there are two well-known answers.

The avalanche method attacks the debt with the highest interest rate first, regardless of its size. Mathematically, this is the cheapest route: you kill the most expensive interest first, so you pay the least overall and finish soonest. For a coldly rational borrower, the avalanche is optimal.

The snowball method, popularised by Dave Ramsey, attacks the smallest balance first, regardless of rate. It costs a little more in interest, but it delivers a quick, visible win — a whole debt gone — and that early victory builds the motivation to keep going. Because debt repayment is as much about behaviour as arithmetic, the snowball often wins in practice by keeping people in the fight.

The honest verdict: if the interest rates on your debts are wildly different — say a 26% card sitting beside a 3% loan — lean avalanche, because the rate gap is too costly to ignore. If your debts are similar in rate and you need encouragement to stay the course, the snowball's momentum may carry you further. The worst method is the one you abandon halfway.

Illustrative example: two orders of attack

The chart shows the same set of debts cleared two ways — highest-rate-first versus smallest-first. The avalanche saves a bit more money; the snowball delivers a faster first win. Pick the one that matches whether you are driven more by numbers or by momentum.