If you have multiple debts — credit cards, student loans, a car payment — you need a strategy for which to pay off first. Two methods dominate personal finance: the avalanche and the snowball. Both work. The right one depends on your psychology as much as your math.
The debt avalanche prioritizes debts by interest rate. You list all your debts, make minimum payments on all of them, and throw every extra dollar at the highest interest rate debt first. Once that’s paid off, you move to the next highest rate, and so on. The avalanche minimizes the total interest you pay over time — it’s the mathematically optimal strategy.
The debt snowball prioritizes debts by balance. You pay minimums on everything, then attack the smallest balance first. Once that’s gone, you roll its payment into the next smallest debt, creating a “snowball” of growing payments. The snowball isn’t optimal by the numbers, but it generates quick wins — eliminating individual debts entirely — which many people find motivating enough to stay the course.
Research by Harvard Business School found that people who used the snowball method were more likely to successfully pay off all their debt, even though they paid more interest total. The behavioral advantage of visible progress outweighed the mathematical advantage of the avalanche for many people.
A practical approach: if your highest-interest debt is also close to being paid off, avalanche it without hesitation. If your highest-interest debt has a huge balance and will take years to clear, consider knocking out one or two small balances first (snowball) to build momentum before switching to avalanche targeting.