The Core Difference
Snowball Method
List debts from smallest to largest balance. Attack the smallest first.
- ✓ Quick psychological wins
- ✓ Fewer accounts open sooner
- ✓ Easier to stay motivated
- ✗ May pay more interest overall
Avalanche Method
List debts from highest to lowest APR. Attack the highest rate first.
- ✓ Saves the most money in interest
- ✓ Mathematically optimal
- ✗ Can take longer to eliminate a single debt
- ✗ Requires discipline without early wins
Real Numbers: A Head-to-Head Example
Same 3 debts, $200/month extra payment — different order:
Starting Debts
❄️ Snowball Order
- 1. Medical bill ($1,200)
- 2. Store card ($2,800)
- 3. Personal loan ($9,000)
Payoff time: ~38 months
Total interest: ~$2,900
🔥 Avalanche Order
- 1. Store card (28% APR)
- 2. Personal loan (12% APR)
- 3. Medical bill (0% APR)
Payoff time: ~38 months
Total interest: ~$2,200
What the Research Says
A Harvard Business Review study found that people paying off the smallest balance first (snowball) were more likely to eliminate their total debt than those using other strategies — because early wins created a "motivational windfall".
However, a Northwestern University study found that when the interest rate difference between debts is large (e.g., 0% medical bill vs 27% credit card), the avalanche creates enough savings to be worth the motivational trade-off.
Bottom line: If your rates are similar, do snowball. If you have one or two very high-rate debts, do avalanche.
When to Use Each Method
Use Snowball if...
- ✓You've tried to pay off debt before and given up
- ✓Your interest rates are similar across all debts
- ✓You need emotional momentum to stay on track
- ✓Your smallest debt is close to payoff
Use Avalanche if...
- ✓You have one or two very high-rate debts (20%+)
- ✓You're mathematically motivated (saving money drives you)
- ✓Your highest-rate debt is also a relatively manageable balance
- ✓You're confident you'll stay disciplined without early wins
Try Both and Compare
The best way to decide? Run your actual numbers through both calculators and see the difference in months and interest. Sometimes it's $50. Sometimes it's $2,000.