money · 7 min read
Which Debt Should You Pay Off First, the Biggest Rate or the Smallest Balance?
The avalanche saves the most interest on paper, yet studies of real borrowers show why clearing small balances first keeps people going.
By WarmLark Editors · Updated October 2026
If you only care about the total cost, pay the debt with the highest interest rate first. That plan is called the avalanche, and on paper it always wins. The snowball, which clears the smallest balance first, costs more in interest, yet studies of real borrowers suggest it helps people keep going long enough to finish. In the worked example below, the price of that push comes to $337.96 over about two years.
Both plans start the same way. You pay the minimum on every debt each month, then send every spare dollar to one target, and when that debt is gone, its payment rolls onto the next one.
The only difference is how you choose the target.
Avalanche: highest rate first
List your debts by Annual Percentage Rate, highest at the top, and ignore the balances. Extra money goes to the top line until it’s paid off, then to the next.
For most people a credit card lands at the top. The Federal Reserve’s consumer credit report, known as G.19 and released September 8, 2026, put the average rate on card accounts that were charged interest at 22.15 percent for the second quarter of 2026. The same report put a 24-month personal loan at 11.86 percent and a 60-month new-car loan at 7.14 percent.
The catch is time. If your highest-rate debt is also your biggest, months can pass before any account closes.
Snowball: smallest balance first
Here you list your debts by balance, smallest first, and ignore the rates. In the example below, the first account closes in month 9, nine months before the avalanche closes anything, and each closed account frees up its payment for the next.
You pay for that speed whenever a small, cheap debt goes ahead of a large, expensive one. When your smallest balance also carries your highest rate, the two plans pick the same target and cost exactly the same.
Order, cost and early wins
Set side by side, the two plans trade money for momentum. The months in the third row come from the worked example in the next section.
| Snowball | Avalanche | |
|---|---|---|
| Order rule | Smallest balance first | Highest rate first |
| Interest cost | Higher, unless the order matches | The lowest possible |
| First account closed in the example below | Month 9 | Month 18 |
| Best fit | Close rates, or a plan you’ve quit before | Rates far apart, and steady habits |
In the example below, the snowball’s head start costs $337.96 in extra interest over about two years.
Three debts, $700 a month
Take three debts at the Fed’s average rates. There’s a $2,500 car loan at 7.14 percent with a $150 payment, a $4,000 personal loan at 11.86 percent with a $180 payment, and a $6,500 card balance at 22.15 percent with a $200 minimum. That’s $13,000 owed and $530 in required payments. You can afford $700 a month, which leaves $170 extra.
The math charges one-twelfth of each yearly rate every month. Every payment arrives on time. Nothing new goes on the card, and the card minimum stays at $200 the whole way, even though a real minimum would shrink as the balance fell.
| Debt | Snowball pays it off | Avalanche pays it off |
|---|---|---|
| Car loan, $2,500 at 7.14% | Month 9 | Month 18 |
| Personal loan, $4,000 at 11.86% | Month 14 | Month 22 |
| Card, $6,500 at 22.15% | Month 23 | Month 21 |
| Total interest paid | $2,417.41 | $2,079.45 |
Example: three debts at the Federal Reserve’s second-quarter 2026 average rates, paid at $700 a month in total.
The snowball closes the car loan nine months before the avalanche closes anything, and the avalanche never sends the car loan any extra money, so its $150 payment alone clears it in month 18.
The avalanche finishes one month sooner and saves you $337.96.
How close the two lines run
Add your three balances together each month and you’ll see the two plans barely separate. On $13,000 of debt, the gap between them peaks at about $328, in month 21. The snowball’s extra month is a single last payment of $17.41, a $17.09 balance plus 32 cents of interest.
Spread over 23 months, the $337.96 the avalanche saves works out to about $15 a month. That’s money worth keeping, and it’s also the full price you’d pay in this example for seeing an account close in month 9.
What borrower records show
The best evidence for the snowball comes from real borrowers. David Gal and Blakeley McShane, then marketing professors at Northwestern’s Kellogg School of Management, studied a debt settlement firm’s data on 6,000 people. Their paper, “Can Small Victories Help Win the War?”, ran in the Journal of Marketing Research in August 2012.
Closing accounts predicted that a person would get rid of all their debt, whatever the dollar size of the accounts they closed. Once the share of accounts closed was counted, the dollar balances of those accounts didn’t predict success at all.
If you’ve quit a payoff plan before, that’s the finding to weigh most.
A game that rewarded the avalanche
A year earlier, the same journal published four experiments by Moty Amar, Dan Ariely, Shahar Ayal, Cynthia Cryder and Scott Rick. Players in a debt game, paid according to how they did, kept clearing small debts first even when the bigger debts charged higher rates. The authors called this “debt account aversion.” When the game blocked players from fully paying off small debts and pointed them to the interest each debt had built up, they cut their total debt faster.
That pull toward small balances cost players money in the game. In your own budget, the same pull is what keeps the snowball rolling.
The 15 percent finding
In a December 2016 Harvard Business Review article, Remi Trudel, a marketing professor at Boston University’s Questrom School, described work with Keri Kettle, Simon Blanchard and Gerald Häubl. They looked at 36 months of card data from nearly 6,000 clients of a workplace financial guidance service. People who aimed their extra payments at one account paid down more debt than people who spread them evenly.
In the team’s first lab experiment, people told to pay off accounts one at a time repaid their debt 15 percent faster than people told to spread payments across all of them. A later experiment found that the feeling of progress came from the share of a balance paid off, not the size of the payment. A small balance gives you the biggest share for each dollar.
Trudel’s advice to start with the smallest balance was meant for debts with similar rates.
When the avalanche pays off
Pick the avalanche when your rates sit far apart and your largest balance carries the top rate. A card at 22.15 percent beside a car loan at 7.14 percent is a wide spread, and every month extra money sits on the cheap debt costs you. Two cards a point apart barely differ.
It also suits you if you’ve finished a payoff plan before, or if wasted interest would bother you more than a closed account would cheer you up.
If watching the total fall is enough to keep you going, take the cheaper route.
When the snowball earns its cost
Pick the snowball when your rates are close, when you have several small balances, or when you’ve started a plan before and stopped. With similar rates it costs little or nothing extra, and that’s the case Trudel’s advice covered.
Either plan beats spreading spare money thinly across every account, the habit Trudel’s data tied to slower progress.
Federal Truth in Lending rules require your credit card statement to print each rate under the words “Annual Percentage Rate”. Write each of your debts on one line with its rate beside its balance, then circle the line that gets your extra payment this month.