Two popular debt payoff strategies — mathematically proven comparison with real examples and a free calculator.
If you have multiple debts — credit cards, student loans, car payments, personal loans — you face a tactical question: which debt do you attack first? Two strategies dominate personal finance advice, and they give different answers.
The Avalanche Method: Pay off debts in order of highest interest rate first. Mathematically optimal — minimises total interest paid.
The Snowball Method: Pay off debts in order of smallest balance first. Psychologically optimal — creates faster wins and builds momentum.
Both strategies share the same core mechanic: make minimum payments on all debts, then throw every extra dollar at your target debt. Once that debt is paid off, roll its payment amount into the next target.
Let's say you have three debts and $400/month to put toward debt payoff:
| Debt | Balance | Interest Rate | Minimum Payment |
|------|---------|--------------|-----------------|
| Credit Card A | $3,200 | 22.9% | $80 |
| Personal Loan | $8,000 | 11.5% | $160 |
| Student Loan | $15,000 | 5.8% | $180 |
Avalanche order: Credit Card A (22.9%) → Personal Loan (11.5%) → Student Loan (5.8%)
Snowball order: Credit Card A ($3,200) → Personal Loan ($8,000) → Student Loan ($15,000)
In this case, both methods target Credit Card A first — it happens to be both the highest rate AND the smallest balance. The difference emerges after that.
Running the actual math: the Avalanche method typically saves $500–$3,000 in total interest over a multi-year payoff period, depending on the debt mix. The larger the spread between your highest and lowest interest rates, the more the Avalanche saves.
The honest answer: the method you will actually stick to.
The Avalanche method is mathematically superior — often by thousands of dollars. But "mathematically superior" only matters if you don't quit. The Snowball method creates a psychological win (a fully paid-off debt) much faster, which research shows increases follow-through significantly.
Choose Avalanche if: you are analytically motivated, the interest rate difference between your debts is large, and you can stay committed without needing quick wins.
Choose Snowball if: you have struggled with debt payoff before, you need motivation, or the amounts and rates are similar enough that the difference is small.
Many financial advisors now recommend a hybrid: use Snowball to eliminate your 1-2 smallest debts immediately (getting quick wins), then switch to Avalanche for the remaining debts. You capture the psychological benefit of the Snowball while optimising the math for the larger portion of your debt.
Use our [free debt payoff calculator](/tools/debt-payoff) to enter your exact debts and see your payoff date for both methods, total interest under each approach, and how much you save by choosing Avalanche.
Track your debt payoff progress automatically with [FlowFund](/signup) — the Debts module shows your payoff timeline, monthly progress, and net worth impact as you eliminate debt.
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