Avalanche vs Snowball: Which Should You Choose?
Almost every debt payoff plan reduces to one decision: in what order do you attack your debts? Both major methods say the same thing about minimum payments, always pay them on every account, every month. The difference is where the extra money goes.
The avalanche method
The avalanche method directs every spare dollar at the debt with the highest annual percentage rate, regardless of balance. Once that debt is gone, the same total monthly payment cascades to the next highest APR. Mathematically this is optimal: it minimizes the total interest you'll pay and usually shortens the overall timeline by a few months. It is the right answer for someone who is purely rational, has the discipline to keep going, and is motivated by numbers on a spreadsheet.
The snowball method
The snowball method ignores APR and targets the smallest balance first. The trade-off is real, you'll pay slightly more interest . but the psychological win of fully eliminating an entire account in a month or two is powerful. A 2012 Northwestern Kellogg study found that people using the snowball method were more likely to stay with their plan and become debt-free than those using avalanche, even though avalanche was mathematically better.
A hybrid: pay the worst rate, but knock out a tiny one first
If you have one credit card with a small balance and a few large loans at moderate APRs, consider clearing the small one first for momentum, then switching to avalanche. You sacrifice a little interest for a big behavioral lift. There is no purity prize for choosing one strategy and never deviating.
What about consolidation or balance transfers?
A 0% balance transfer card can be a powerful accelerator on credit-card debt, but only if you have a written plan to pay the full balance before the promo period ends. Otherwise the deferred interest can erase the savings overnight. Personal-loan consolidation makes sense when the new APR is meaningfully lower than the weighted average of what you're consolidating and you don't run the original cards back up.
The non-financial side of debt payoff
The strategy you'll actually complete beats the optimal strategy you abandon in month four. Pick the one that makes you want to check the calculator every payday, that's the one that pays you back the most.