The Two Methods, Side by Side
If you’ve got more than one debt, you’ve probably run into the avalanche-versus-snowball debate. The debt avalanche has you list every balance from highest interest rate to lowest, then throw every spare dollar at the highest-rate debt first while paying minimums on everything else. The debt snowball ignores interest rates entirely and has you attack the smallest balance first, no matter what it’s costing you, then roll that payment into the next-smallest once it’s gone.
What the Math Says
On a spreadsheet, the avalanche almost always wins. Because you’re knocking out your most expensive debt first, you pay less total interest over the life of the payoff. For someone carrying a 24% APR credit card alongside a 6% car loan, the difference can run into hundreds of dollars saved, sometimes more, depending on balances and how aggressively you’re paying. If you’re the type of person who finds a spreadsheet motivating on its own, the avalanche is the mathematically correct answer and there’s no real argument against it.
What the Psychology Says
Here’s the catch: a 2016 Harvard Business School study of over 6,000 people working on debt found that those who focused on paying off their smallest balances first, regardless of interest rate, were significantly more likely to eliminate their overall debt than those chasing the mathematically optimal approach. Wiping out an entire account, even a small $400 one, creates a visible win. That win is what keeps people showing up to the budget next month instead of quietly giving up around month four, which is when most ad-hoc debt plans die.
Which One Should You Pick
Use this as a rough filter. If your debts are fairly close in size, or you’ve successfully stuck with financial plans before without needing early wins, go avalanche and save the extra money. If you have one or two small nuisance balances mixed in with larger ones, or you’ve started and abandoned a debt payoff plan in the past, start with the snowball and use those quick wins to build the habit. You can also hybridize: knock out any debt under $500 for a fast win, then switch to avalanche order for everything that’s left. The method that gets you to month twelve still paying is better than the one that’s 3% more efficient on paper but gets abandoned in month five.
