When you have more than one debt — a card, a loan, financing — and a limited monthly budget to pay them off, a practical question comes up: which debt do I attack first with the extra money? Two strategies answer this question in opposite ways: snowball and avalanche.
Snowball: smallest balance first
The snowball strategy prioritizes the debt with the smallest balance, regardless of interest rate. You pay the minimum required on the other debts (so they don't grow) and put all the extra money toward the smallest one. As soon as it's paid off, you "roll the snowball" to the next smallest, now with a bigger budget available (whatever was going to the paid-off debt gets added to what was already earmarked for payoff).
Advantage: paying off a whole debt quickly creates a concrete sense of progress, which helps many people stay disciplined over months or years of payments.
Avalanche: highest interest rate first
The avalanche strategy prioritizes the debt with the highest interest rate, regardless of balance size. The logic is purely mathematical: every debt with higher interest costs more each month it stays open, so eliminating the most expensive one first reduces the total interest paid over the whole process.
Advantage: almost always results in less total money paid in interest, compared to snowball, for the same monthly budget.
Which one to choose?
There's no universally correct answer — it depends on what will keep you paying off debts month after month:
- If you tend to lose motivation without seeing quick results, snowball tends to work better in practice, even if it costs a bit more in total interest.
- If you already have the discipline to stick with the plan even without immediate "wins," avalanche saves real money — sometimes a difference of thousands of dollars in interest, depending on how different your debts' rates are.
In most cases, when one debt has a much higher interest rate than the others (for example, credit card revolving debt, which easily exceeds 10% a month), avalanche naturally already picks it to attack first — which, in that case, coincides with the common sense of eliminating the most dangerous debt first.
To see the real difference in months and money for your specific set of debts, use the debt payoff calculator. It simulates both strategies side by side from the balance, rate of each debt, and monthly budget available, showing how much time and interest each one costs in your specific case.
A debt with very high interest deserves separate attention
If one of your debts is credit card revolving debt, it's worth understanding separately why it's so expensive and how to get out of it as soon as possible — even before putting together a full debt payoff plan.
See more in How to get out of credit card revolving debt.
This content is educational and does not replace personalized financial advice.