Debt Snowball vs. Avalanche: Which Pays Off Debt Faster?

If you have more than one debt and some money left over after the minimum payments, you have to decide where that extra money goes. There are two well-known answers:

• The debt avalanche: pay the minimum on everything, and put every extra dollar on the debt with the highest interest rate. When it’s gone, move to the next-highest rate.
• The debt snowball: pay the minimum on everything, and put every extra dollar on the debt with the smallest balance. When it’s gone, move to the next-smallest.

In both methods, when a debt is paid off, its minimum payment doesn’t disappear from your budget. It rolls onto the next debt in line, so your total monthly payment stays the same and each debt gets paid off faster than the last. That rollover is the “snowball” part, and both methods use it.

A worked example

Say you can put $661 a month toward three debts:

Debt	Balance	Interest rate (APR)	Minimum payment
Store card	$900	19.99%	$30
Visa	$5,200	27.99%	$156
Personal loan	$6,800	11.50%	$225

The minimums add up to $411, so you have $250 extra each month. Running the numbers month by month (this is exactly what our debt payoff calculator does):

• Avalanche (Visa first, then the store card, then the loan): debt-free in 23 months, paying $2,281.51 in interest.
• Snowball (store card first, then the Visa, then the loan): debt-free in 24 months, paying $2,374.13 in interest.
• Minimums only (still rolling each paid-off minimum onto the next debt): 46 months and $5,726.93 in interest.

Two things stand out. First, the avalanche is cheaper, as it always is, but here by only about $93 and one month. Second, the much bigger difference is between paying something extra and paying only the minimums: the extra $250 a month saves more than $3,300 and nearly two years with either method.

The gap between the two methods depends on your debts. It grows when your biggest balance also has a much higher rate than the others, and shrinks when your smallest debts happen to be your most expensive ones (then both methods choose the same order).

Why the avalanche costs less

Interest is charged on the balance, at each debt’s own rate. Every dollar you put on a 27.99% card stops costing you 27.99% a year; the same dollar on an 11.5% loan stops costing 11.5%. Paying the highest rate first removes the most expensive dollars first, so over the whole payoff it always costs the least interest, or ties when the order is the same.

Credit card rates make this matter. The Federal Reserve’s consumer credit data show the average rate on credit card accounts that were charged interest was close to 23% in 2024. Debts at those rates grow quickly if they sit.

Why the snowball still has fans

People aren’t spreadsheets, and the research on how people actually repay debt is interesting:

• We gravitate to small balances. In experiments by Amar, Ariely, Ayal, Cryder and Rick (2011), participants tended to pay off their smallest debts first, even when larger debts had higher interest rates. The researchers called this “debt account aversion”: people like the feeling of closing accounts.
• Closing accounts may keep people going. David Gal and Blakeley McShane (2012) found evidence that people who closed out individual debts were more likely to go on to eliminate their debt altogether, consistent with small wins building motivation.
• Focus beats spreading thin. Remi Trudel, Gerald Häubl, Keri Kettle and Simon Blanchard (2016) found that people who concentrated payments on one account paid down their debt about 15% faster than people who spread the same money evenly across all of them. Their explanation: progress feels like the share of a balance cleared, so seeing one debt shrink quickly keeps people at it.
• Many people use neither method. A large study of credit card holders, described by the National Bureau of Economic Research, found that people with two cards put only about half of their extra payments on the higher-rate card, spreading money around in ways that cost more than a focused plan.

So the snowball gives up some interest in exchange for quicker, visible wins, and the evidence suggests those wins help some people stay the course. The worst options are spreading extra payments evenly or stopping altogether.

How to choose

• Choose the avalanche if you’ll stick with a plan because the numbers say so, or if your highest-rate debt is large and much more expensive than the rest. It’s the one that minimises interest.
• Choose the snowball if you’ve started payoff plans before and lost steam, or if you have a few small debts you could clear within a few months. Those early payoffs also free up their minimum payments sooner.
• Mix them if that’s what keeps you going: clear one or two tiny balances first for momentum, then switch to the highest rate. The math cost is usually small when the first debts are small.

As the St. Louis Fed’s guide to the question puts it, economists and personal-finance writers disagree on the best strategy. The choice between these two matters far less than consistently paying more than the minimums.

Before you start

• Keep paying every minimum. Both methods assume all minimums are paid on time, every month. Missed payments add fees and can raise your rate.
• Know your real monthly number. The extra amount has to come from somewhere. A budget shows you what you can commit every month without falling short on bills. If you don’t have one yet, zero-based budgeting is a good way to find it.
• Keep a small cushion. If one surprise bill would send you back to a credit card, set aside a small emergency fund first, even a few hundred dollars. The emergency fund calculator helps you size it.
• Check for cheaper options. If you’re paying a high rate on a large balance, ask your card issuer about a lower rate. Look carefully at the fees and terms of any balance transfer or consolidation loan before you agree to one.

When neither method is the right next step

If your income doesn’t cover your minimum payments, a payoff order won’t fix that. Look at budgeting paycheck to paycheck first, contact your lenders before you miss a payment to ask about hardship options, and consider a nonprofit credit counselor.

To compare both methods with your own debts, enter them in the debt payoff calculator. It shows the payoff date, total interest and the month each debt is cleared for both strategies side by side.