Debt Avalanche vs Debt Snowball: Which Payoff Strategy Saves You More?
Both methods use the same core principle: pay minimums on all debts except one, and concentrate all extra cash on that one card. The difference is which card you target first — and whether the mathematically optimal choice is right for your psychology.
Debt Avalanche
List all cards by APR, highest to lowest
Pay minimums on every card except the highest APR card
Put all extra money on the highest APR card
When that card is paid off, roll its full payment to the next highest APR card
Repeat until debt-free
Best for: minimising total interest paid
Debt Snowball
List all cards by balance, smallest to largest
Pay minimums on every card except the smallest balance card
Put all extra money on the smallest balance card
When that card is paid off, roll its full payment to the next smallest balance
Repeat until debt-free
Best for: motivation and early wins
Head-to-Head: Two-Card Scenario
Card A: $3,000 at 22% APR · Card B: $1,500 at 18% APR · Total monthly budget: $250
Avalanche Method
Phase 1: Pay $200/mo on Card A (22%), $50 on Card B minimum. Card A clears in ~19 months. Phase 2: Roll $200 to Card B. Pay $250/mo on remaining ~$750 balance. Clears in ~3 months.
Total months~22 months
Total interest~$1,340
First payoffMonth 19 (Card A)
Snowball Method
Phase 1: Pay $200/mo on Card B (smaller), $50 on Card A minimum. Card B clears in ~9 months. Phase 2: Roll $200 to Card A. Pay $250/mo on remaining ~$2,780 balance. Clears in ~14 months.
Total months~23 months
Total interest~$1,520
First payoffMonth 9 (Card B)
Avalanche saves approximately $180 more in interest in this scenario — and finishes 1 month faster. The snowball pays off a card 10 months earlier (month 9 vs month 19), but costs ~$180 more total.
When the Snowball Wins
The snowball costs more in interest, but it produces concrete wins faster. Research on behaviour and debt repayment suggests that early success increases motivation and plan adherence. If you are uncertain whether you can maintain the discipline for 2+ years, the snowball’s early win in month 9 may keep you on plan more effectively than the avalanche’s later win in month 19.
A plan you stick to for 23 months beats a plan you abandon after month 12. If the $180 interest difference between avalanche and snowball is the price of staying motivated, it is likely worth it.
When the Avalanche Wins Clearly
The avalanche advantage grows with the APR difference between your highest and lowest rate cards. If one card is at 28% APR and another is at 14%, paying the 28% card first saves dramatically more than the two-percentage-point difference in this scenario. When the APR spread is 10%+ across your cards, the avalanche saves significantly more — often $1,000–$3,000 — and the motivation argument weakens against real cash.
For a single card:
If you only have one credit card, there is no strategy decision — just pay as much as you can each month, fixed. Avalanche = snowball = “put all extra cash here”. The strategy question only arises with multiple debts. Use the main calculator to find your optimal fixed payment.