Debt Payoff Strategy: Avalanche vs Snowball Explained
The core debate in debt payoff strategy is mathematics versus psychology. The Avalanche method wins on pure interest savings — sometimes by thousands of dollars. The Snowball method wins on motivation and completion rates, with research from Northwestern University showing that eliminating smaller debts first increases the likelihood of staying on track.
Avalanche method: mathematically optimal
List all debts from highest to lowest interest rate. Pay the minimum on all debts. Put every extra dollar toward the highest-rate debt. When it's paid off, redirect that freed-up payment to the next highest rate (this is the "debt avalanche" — the rolling of payments). The Avalanche method minimizes total interest paid and gets you debt-free fastest on paper.
Snowball method: psychologically powerful
List all debts from smallest to largest balance. Pay minimums on all. Attack the smallest balance first. The quick wins — eliminating entire debts early — create momentum and a sense of progress. For people who have struggled to stay motivated, the Snowball's emotional rewards are a genuine financial advantage if they increase consistency. A plan you follow beats a plan you abandon.
How much does the choice actually matter?
| Scenario | Avalanche saves | Time difference | Recommendation |
|---|---|---|---|
| Debts at similar rates | ~$0–200 | 0–1 months | Snowball — motivation wins |
| One high-rate card + others | $500–2,000 | 2–6 months | Avalanche — the math matters |
| Large high-rate debt | $2,000–8,000+ | 6–18 months | Avalanche — significant savings |
| Struggling with motivation | Irrelevant | Irrelevant | Snowball — completion is everything |
The extra payment is the real lever
The single most impactful variable is not which method you choose — it's how much extra you can throw at debt each month. Increasing your extra payment from $200 to $500/month typically cuts payoff time by 40% and interest by 50%. Use this calculator to find the number that meaningfully accelerates your payoff without destroying your budget.
After the debts are gone: build wealth fast
The discipline that paid off $50,000 in debt will build $50,000 in investments — redirect the entire freed payment to TFSA first ($7,000/year room in 2025), then RRSP. The same compounding that worked against you on debt now works powerfully for you.