Two methods, one principle
Both the snowball and the avalanche work the same way mechanically: pay every minimum, then throw all spare cash at one chosen debt. When that debt clears, its payment rolls into the next one, so the amount attacking your debt grows every time an account closes. The only difference is which debt you target first.
Avalanche targets the highest interest rate. It is optimal in pure dollar terms because it removes the most expensive interest first.
Snowball targets the smallest balance. It costs slightly more but produces visible wins early, and behavioural research from Northwestern's Kellogg School has found that people who close accounts in order of size are more likely to complete the plan.
How big is the difference, really?
For most household debt profiles the avalanche saves a few hundred to a couple of thousand dollars. Run your own numbers above. If avalanche saves $150, take the snowball if it keeps you motivated. If it saves $3,000, take the avalanche and find motivation elsewhere.
Before you start
- Build a small buffer first — $1,000 to one month of expenses. Without it, the next unexpected repair goes straight back on a credit card.
- Capture any employer 401(k) match. A 50–100% instant return beats paying down almost any debt.
- List every debt with its rate, balance and minimum. Most people underestimate the total until they write it down.
Keeping the plan alive
Automate every minimum so nothing is ever late. Set a calendar reminder to redirect the freed-up payment the month after each debt closes — this is the step people forget, and it is where the compounding effect of the method lives. Track the total balance monthly rather than daily; the line only needs to go down.
When the numbers do not work
If your required minimums exceed your income after essentials, no payoff method will fix it. That is the point to speak to a non-profit credit counsellor about a debt management plan, or to get legal advice about the alternatives. Acting early preserves more options than waiting until accounts are in collections.