Debt Snowball vs Avalanche: Which Method Wins?
Last updated: 6 May 2025
If you have multiple debts — credit cards, personal loans, car finance, HECS — you face a key question: which one do you pay off first? The debt snowball and debt avalanche are the two dominant strategies, and they lead to meaningfully different financial outcomes.
The debt avalanche method
Pay minimum repayments on all debts, then direct every extra dollar to the debt with the highest interest rate first. Once it's paid off, roll that payment to the next highest-rate debt.
Advantage: Mathematically optimal. Minimises total interest paid over the repayment period.
Disadvantage: Can feel slow if the highest-rate debt is large. Motivation can drop before the first win.
The debt snowball method
Pay minimum repayments on all debts, then direct every extra dollar to the debt with the smallest balance first, regardless of interest rate. Each debt eliminated creates momentum.
Advantage: Psychologically powerful. Quick wins early create motivation to continue. Research by Northwestern University found debt snowball users pay off debt faster in practice.
Disadvantage: Costs more in total interest than the avalanche method.
Worked example
You have three debts and $500/month available above minimums:
| Debt | Balance | Rate | Min. payment |
|---|---|---|---|
| Credit card | $3,500 | 20% | $70 |
| Car loan | $12,000 | 9% | $240 |
| Personal loan | $8,000 | 14% | $180 |
| Strategy | Order | Total interest | Time to debt-free |
|---|---|---|---|
| Avalanche | Credit card → Personal loan → Car loan | ~$3,100 | ~29 months |
| Snowball | Credit card → Personal loan → Car loan | ~$3,400 | ~31 months |
In this example the order happens to be identical, so the difference is smaller. When debts have very different balances and rates, the gap widens — avalanche can save $1,000–$5,000 in interest on larger debt portfolios.
Which method should you choose?
Choose avalanche if: You are mathematically motivated, the interest rate differences between debts are large (e.g. 20% credit card vs 8% car loan), and you have the discipline to stay consistent without early wins.
Choose snowball if: You need motivation boosts, have tried and failed at debt repayment before, or if your debts are similarly sized (making interest savings small).
Hybrid approach: Pay off one small debt first for a quick win (snowball logic), then switch to avalanche for the remaining debts. This is what many financial counsellors recommend in practice.
The most important rule: pay more than the minimum
The choice between snowball and avalanche matters far less than the decision to pay more than the minimum on any debt. A credit card with a $5,000 balance at 20% interest, paying only the 2% minimum each month, takes over 30 years to pay off and costs $11,000+ in interest. Paying $300/month retires it in under 2 years and costs $800 in interest.
How this affects your mortgage borrowing power
Paying off debts before applying for a home loan dramatically increases your borrowing capacity. Every $500/month eliminated in debt payments increases borrowing power by approximately $65,000. Clearing a car loan could be the difference between affording your target property and falling short. See our borrowing power calculator to model the impact.
Related: How compound interest works on debt · Loan repayment calculator