Paying off multiple debts at once raises a practical question: which one should you focus extra payments on first? Two strategies are most commonly referenced, and they optimize for different things.
The avalanche method
The avalanche method directs extra payments toward the debt with the highest interest rate first, while making minimum payments on everything else. Once the highest-rate debt is paid off, you move to the next-highest, and so on. Mathematically, this approach minimizes the total interest paid over time, since you're always attacking the debt that's costing you the most.
The snowball method
The snowball method instead directs extra payments toward the debt with the smallest balance first, regardless of interest rate, again making minimum payments on everything else. Once the smallest debt is fully paid off, that payment amount rolls into the next-smallest, building momentum — hence "snowball." This approach doesn't minimize total interest paid, but it's designed around behavioral psychology: quickly eliminating an entire debt, even a small one, can provide a motivating sense of progress that a purely math-optimal approach doesn't always deliver.
Which one actually works better?
In pure interest-cost terms, the avalanche method is more efficient — you'll generally pay less in total interest by tackling the highest-rate debt first. But personal finance isn't purely a math problem; it's also a behavior problem. If a strategy is more likely to keep someone consistently engaged and less likely to be abandoned partway through, it may produce a better real-world outcome even if it's not mathematically optimal on paper. Some financial educators and researchers have pointed to the snowball method's early wins as genuinely useful for sustaining motivation, particularly for people who have struggled to stick with debt payoff plans in the past.
A hybrid approach
Some people use a middle path: applying the avalanche method for debts with meaningfully different interest rates (where the cost difference is significant), while using snowball-style ordering when several debts have similar rates (where the interest-cost difference between orderings is small anyway). This isn't an official third method, just a practical way to capture some of both benefits.
What matters more than the method
- Consistently paying more than the minimum on your target debt, whichever method you choose.
- Continuing to make at least minimum payments on every other debt, to avoid late fees or penalty rates.
- Avoiding taking on new debt while paying down existing balances, which can undermine either strategy's progress.
- Choosing the method you're actually likely to stick with — the theoretically optimal strategy you abandon after two months is worse than the good-enough strategy you follow for two years.
