Debt Avalanche vs Snowball: Which Method Saves More Money?

Two people. Same three debts. Both stick to their payoff plan for exactly 35 months. When the dust settles, one has paid $225 less in interest. The other crossed a finish line in month 9 (13 months earlier) and never lost momentum. Both are completely debt-free on the same day.

This is the debt avalanche versus the debt snowball. The math isn’t close, but the choice is less obvious than it looks.

The setup

Start with three debts:

Total minimums: $406/month. You have $200 extra per month to put toward debt. That’s $606/month total; you’re not wavering. The only question is which debt gets the extra money first.

Avalanche: highest rate first

Pay minimums on everything. Put all extra money toward the debt with the highest interest rate.

With these debts, that’s the credit card at 22%. Once it’s gone, the freed minimum gets rolled into the next attack: the personal loan at 15%. Then everything hits the car loan.

Order: credit card → personal loan → car loan.

Snowball: lowest balance first

Pay minimums on everything. Put all extra money toward the debt with the smallest balance.

That’s the personal loan at $2,100. Gone in 9 months. Then everything goes to the credit card. Then the car loan.

Order: personal loan → credit card → car loan.

What the numbers actually show

Avalanche saves $225. Both strategies reach the finish line at month 35 (same timeline).

The gap isn’t time. It’s $225 in interest, which is real money but not dramatic on this particular set of debts. On a larger high-rate balance (say, $15,000 at 24%), the gap widens significantly. The worse your highest-rate debt, the more avalanche wins. In some scenarios the difference is thousands of dollars. In this one it’s a car payment.

Snowball isn’t irrational

Most personal finance writing treats the snowball like a consolation prize for people who can’t do math. That framing is wrong.

Paying off the personal loan in 9 months instead of waiting until month 22 isn’t a psychological trick. It’s a concrete result: one fewer account, one fewer bill, one proof that the plan is working. Research on behavior change is consistent: early wins sustain effort over time. If the snowball keeps someone in the game through month 35 when they otherwise would have quit at month 12, the $225 “cost” was a bargain.

The snowball only fails when people treat it as a permanent identity rather than a strategic choice. If your highest-rate debt also happens to be your smallest balance, there’s often no meaningful tradeoff at all. Pick avalanche and move on.

How to choose

Avalanche if you’re motivated by data, your highest-rate debt carries a large balance, and you can sustain a long stretch before your first payoff.

Snowball if you’ve tried paying off debt before and quit, you need visible wins to stay consistent, or the rate spread between your debts is small enough that the interest gap is trivial.

Hybrid if neither feels quite right. Pay off the smallest balance first, then pivot to highest rate. This isn’t a cop-out; it’s a strategy that matches how you actually behave, which matters more than theoretical optimality.

The difference between avalanche and snowball is a few hundred dollars. The difference between any deliberate strategy and no strategy is everything.

Once the debt is gone, the next question is how much you need to stop working entirely. That’s your FIRE number and the math is simpler than it looks.