The two methods in one sentence each
The debt snowball pays your smallest balance first. The debt avalanche pays your highest interest rate first. In both, you keep paying the minimum on every other debt and throw every spare dollar at one target.
When the target is paid off, you don't spend its old payment. You add it to the next target. That rolling payment is the part that actually speeds things up, and both methods share it. The only difference is the order.
Why the avalanche costs less
Interest is charged as a percentage of each balance. A dollar sitting on a 24% card costs you more each month than a dollar on a 5% loan. Moving extra money to the highest rate first shrinks the most expensive balance fastest, so less interest builds up over the whole plan.
That's why the avalanche almost always ties or beats the snowball on total interest. Nothing clever is going on. You're paying off the priciest money first.
When the gap is small and when it's big
Sometimes the two methods barely differ. Take three debts: a $4,500 store card at 22.9%, an $8,000 loan at 7.5% and a $12,000 card at 12%, with $850 a month to spend. The store card is both the smallest and the most expensive, so both methods start there. The total gap is about $113 of interest, and both finish in 34 payments.
The gap grows when your smallest debt has your lowest rate. Picture a $3,000 loan at 5% with a $100 minimum and a $10,000 card at 24% with a $250 minimum, plus $250 extra a month. The snowball clears the small loan in month 9 but finishes everything in 29 payments with about $3,824.62 of interest. The avalanche goes after the card first and finishes in 27 payments with about $3,103.28. That's two months and roughly $721 in the avalanche's favor.
Why people still pick the snowball
Paying off a whole account early feels good, and it removes a bill from your month. If you've started debt plans before and given up, seeing a balance hit zero in a few months can keep you going. A plan you finish beats a cheaper plan you quit.
The CFPB's debt action plan describes both approaches as options. There's no single right answer. So ask yourself how much extra interest you'd pay for the faster win, and whether that price is worth it to you.
How to choose in five minutes
Run both. Our debt payoff calculator puts avalanche, snowball and your own order side by side using the same budget, so you see the exact interest gap and the month each debt clears.
- If the gap is a few dollars, pick whichever order keeps you motivated.
- If the gap is hundreds or thousands, lean toward the avalanche.
- If your smallest debt clears in a few months either way, start there and switch to avalanche after.
- If a debt has a promo rate ending soon, it may need to jump the line regardless of method.
Mistakes that sink either plan
Neither method works if new charges keep landing on the cards you're paying down. The plan also breaks if you trim your monthly total every time a debt clears, because the rollover is where the speed comes from.
Don't drain your savings to make a huge first payment, either. One car repair on a credit card can undo months of progress. Keep a small cushion, pay every minimum on time, and revisit the order whenever a rate changes.
Frequently asked questions
Does the avalanche method always save the most money?
It almost always ties or saves the most interest, because the highest-rate balance shrinks first. Real results can shift a little with fees, promo rates or minimums that change.
Can I switch from snowball to avalanche partway through?
Yes. Many people clear one small balance for a quick win, then point the extra money at the highest rate. Rerun your numbers when you switch.
What if two debts have the same interest rate?
Then the avalanche has no preference between them, so paying the smaller one first gives you the snowball's quick win at no extra cost.
Do I stop paying my other debts with these methods?
No. You keep making at least the required payment on every debt. Only the extra money goes to one target.
Is the snowball method a bad idea?
Not if it keeps you on track. It usually costs some extra interest, and you can measure exactly how much before you choose.
References
These sources support the method or guidance used for Debt Payoff Calculator. Verify time-sensitive rules at the source.
Try the calculator
Open Debt Payoff Calculator, enter your scenario, and compare its supporting rows with this guide's method and checks.