If you're paying off more than one debt, the order matters. Not as much as how much you pay, but enough to argue about, and people do argue about it.
The two best-known approaches are the debt snowball and the debt avalanche. Both work the same way mechanically. They differ only in which debt you attack first. Here's how each works, a worked example with real numbers, and how to pick.
How both methods work
The setup is identical:
- List all your debts with their balance, interest rate (APR), and minimum payment.
- Work out how much you can pay in total each month. Everything above the combined minimums is your extra payment.
- Pay the minimum on every debt, every month, so nothing goes late.
- Put the entire extra payment toward one target debt.
- When the target is paid off, roll its minimum payment plus the extra into the next debt on the list.
Step 5 is what gives both methods their momentum. Your total monthly payment stays the same, but more and more of it goes to the next target, so each debt falls faster than the last.
The debt snowball: smallest balance first
With the snowball, you order debts from smallest balance to largest, ignoring interest rates.
The appeal is psychological. A small balance disappears quickly, and you get a visible win: one less bill, one less login, one less thing to think about. That win is what keeps a lot of people going through a plan that can take years.
There's research behind this. A study by David Gal and Blakeley McShane, published in the Journal of Marketing Research in 2012, looked at thousands of people working through a debt settlement program and found that those who closed out individual accounts were more likely to eventually eliminate all their debt. It's observational, so it doesn't prove the method causes the success, but it fits what many people report.
The debt avalanche: highest interest rate first
With the avalanche, you order debts from highest interest rate to lowest, ignoring balances.
The appeal is mathematical. Interest is the cost of carrying debt, so killing the most expensive debt first means less interest overall and, usually, a slightly earlier finish. If you're motivated by the numbers and confident you'll stick with the plan, it's the optimal choice.
The downside is that your highest-rate debt might also be a large one, so the first win can take a long time to arrive.
A worked example
Here's someone with four debts, paying $805 a month in total: $555 in combined minimums plus $250 extra.
| Debt | Balance | APR | Minimum payment |
|---|---|---|---|
| Personal loan | $1,200 | 9.0% | $50 |
| Store card | $2,400 | 29.99% | $75 |
| Credit card | $5,800 | 24.99% | $150 |
| Car loan | $9,000 | 7.5% | $280 |
Snowball order: personal loan, store card, credit card, car loan.
Avalanche order: store card, credit card, personal loan, car loan.
Running both month by month, with interest added each month before payments:
| Debt snowball | Debt avalanche | |
|---|---|---|
| First debt paid off | Month 5 (personal loan) | Month 9 (store card) |
| Second debt paid off | Month 11 | Month 22 |
| Debt-free in | 28 months | 27 months |
| Total interest paid | $3,519 | $3,234 |
So the avalanche saves $285 and one month. The snowball gets its first win four months sooner and its second win eleven months sooner.
For comparison, paying only the minimums on all four debts would take about 80 months and cost roughly $9,800 in interest. Either method, with a steady extra payment, cuts that by more than $6,000.
That's the real lesson of the example. The gap between snowball and avalanche is small. The gap between having a plan and not having one is huge.
When the difference gets bigger
The avalanche's advantage grows when:
- Your highest-rate debt is also large (a big credit card balance at 25% or more).
- The interest rates are far apart.
- Your extra payment is small, so the plan runs for a long time.
The snowball's motivational advantage matters more when:
- You have several small debts you could clear quickly.
- You've started payoff plans before and abandoned them.
- The rates are fairly close, so the interest difference is minor anyway.
Which should you choose?
Run your own numbers in the free debt payoff tracker. It's a debt snowball and avalanche calculator in one: enter your debts and extra payment, switch between methods, and see the debt-free date and total interest for each. If the gap is a few hundred dollars, pick whichever you're more likely to finish. If it's thousands, the avalanche is probably worth the patience.
Some people use a hybrid: knock out one tiny balance first for a quick win, then switch to the avalanche for the rest. That's perfectly reasonable. The best method is the one you'll still be following in month eighteen.
How to find more money for the extra payment
The extra payment is what makes either method work, so it's worth hunting for:
- Track your spending for a month to see where money actually goes. Most people find at least one category bigger than they expected. Our guide on how to track expenses shows a quick way to do it.
- Cancel subscriptions you don't use. Each one is a fixed saving every month. Start with how to cancel subscriptions.
- Redirect raises and windfalls. Tax refunds, bonuses and pay rises can go straight to the target debt before they get absorbed into spending.
- Look at refinancing. If your credit has improved, a lower-rate consolidation loan can cut the interest bill. The loan calculator shows the total cost of any new loan before you sign.
Don't skip the emergency buffer
One last thing: before throwing every spare dollar at debt, keep a small cash buffer, even $1,000. Without one, the next car repair goes on a credit card and undoes months of progress. The emergency fund calculator shows what one month of essential costs looks like for you, and our guide on how much you should have in savings covers how to balance saving with paying down debt.
And keep an eye on your spending while you pay things down. It's easy to clear a card and then slowly fill it again. Logging purchases as they happen, whether in the free expense tracker or by texting them to TallyMsg, keeps the new spending visible while the old debt disappears.