Avalanche vs Snowball: The Same $25,000 of Debt, Run to Maturity Both Ways, With 2026 APRs

You have the cards and no order. That is the problem, and it is smaller than it feels, because the debt is already known. What is not known is the order. This article takes one fixed $25,000 of debt, runs it to maturity both ways, at dated 2026 rates, and counts what each way costs in interest and in time. The payoff order is the decision. The rest of the article is the arithmetic of it.

The avalanche

The avalanche is the rate order. List every debt, put the highest APR first — the APR is the yearly cost of the debt, stated in percent, the rate — and put all the extra money there until it is gone. Then take the money that was going to it, point it at the next highest rate, and keep going down the list to the cheapest debt last. It is the order that costs the least interest on any fixed set of debts and any fixed monthly payment. It can also feel slow, because the first debt to die is not the smallest one; it is the most expensive one, and the most expensive one is often the largest balance on the list.

The snowball

The snowball is the balance order. Same list, smallest balance first. Minimum payments on everything, the extra money on the smallest account until it is gone, and when it is gone that freed payment joins the extra and the target moves up one balance at a time. The rate does not choose the order here; the size does. The name is the mechanism. Each payoff frees money, the payments get bigger, the list gets shorter. The first win comes early, and the case for the method is the case for that win, counted in the last section.

The list

One reader, four debts, $25,000 total, September 2026. The rate on each line is the yearly cost of that debt. The debt is the debt; the order is the decision.

Every rate in that table is a published number, from one dated source. The Federal Reserve’s G.19 Consumer Credit release, published September 8, 2026, carries the second-quarter 2026 averages: 20.94 percent on all credit-card accounts, 22.15 percent on the accounts actually being assessed interest, 11.86 percent on 24-month personal loans, and 7.14 percent on 60-month new-car loans. Those four numbers are the schedule’s rates, as of the write date, September 28, 2026. The two cards in the list carry the two card averages, the higher one on the smaller balance.

Two notes on the dates, because card rates are variable. First, card APRs follow the prime rate, which the Federal Reserve’s H.15 release had at 7.00 percent in the week ending September 24, 2026; if a card’s rate moves mid-schedule, the schedule is re-run. That is the dated-schedule rule: the numbers are the numbers of a date, and the date is stated. Second, where these rates sit in time: the same release’s annual series has the all-accounts card average at 14.60 percent in 2021, 21.58 percent in 2024, and 21.22 percent in 2025, with 21.00 percent in the first quarter of 2026 and 20.94 percent in the second. The card rate has sat around 21 percent for three years and moved almost none of that way this year. Business Insider reported the fourth quarter of 2024 at 21.47 percent from the same Federal Reserve data, in a piece updated January 9, 2025. And the scale of it: as of July 2026, the same release puts revolving credit outstanding at $1,357.2 billion. This $25,000 is one person’s slice of it, and the method does not care about the size of the slice.

The schedule

The mechanics, stated once so the table below is verifiable. The reader sets a $1,000 monthly payment: $666 of it covers the four base payments in the list, and $334 of it is extra. Every month, interest accrues on each open balance at its APR divided by 12. The base payment goes to every open debt. The $334 goes to the first debt in the chosen order. When a debt is paid off, its base payment joins the $334, and the target moves. The payment never changes; only the order does. First payment: October 15, 2026.

The two orders on this list:

• The avalanche, in rate order: card 1 at 22.15, card 2 at 20.94, the personal loan at 11.86, the auto loan at 7.14.
• The snowball, in balance order: the auto loan at $2,500, card 1 at $6,000, the personal loan at $7,500, card 2 at $9,000.

Look at what the balance order does to this list. Its first target is the cheapest debt on it. That is not a flaw in the method. That is the method.

The month-by-month table, both orders in one, from October 2026 to the last payment. Balances and monthly interest are rounded to the dollar in the table; the totals in the next section are computed in cents and stated exactly.

The delta

The counted totals, the whole run:

• Total interest: $6,139.26 under the avalanche, $7,217.76 under the snowball. The snowball pays $1,078.50 more.
• Debt-free: February 15, 2030 under the avalanche (month 41), December 15, 2029 under the snowball (month 39). The snowball finishes two months earlier.
• First debt paid off: November 2027 under the avalanche (card 1, month 14), April 2027 under the snowball (the auto loan, month 7). The first win comes seven months sooner.

Where the interest goes, per debt:

The pattern is the whole story. The two cards carry every dollar of the difference, in the same direction: the avalanche hits them first, the snowball hits them last. The personal loan and the auto loan cost less under the snowball — $336.02 and $360.95 less — because the snowball leaves the cheap debts alone longest, and the avalanche’s late money kills them quickly. The net is $1,078.50, and it is the two cards’ interest, counted.

Counted in time, the picture turns. The order that costs less interest finishes two months later on this schedule. That is not a contradiction; it is the schedule. The interest delta and the date delta run in opposite directions, and the reader knows which one to weigh: the rate is the number that decides the interest, and the date is the number that decides the wait.

The one you finish

The question the two methods actually answer is not which one saves more. It is which one the reader finishes.

The research side, counted out. A 2012 study from Northwestern University’s Kellogg School of Management, as the literature on the method summarizes it, found that consumers who tackle small balances first are likelier to eliminate their overall debt than the ones who start at the highest rate. A 2016 Harvard Business Review study found that a person’s sense of progress tracks the portion of a balance paid down, not the size of the payment, which is why paying a small account in full is the strongest progress signal a schedule can produce. The researchers Moty Amar and colleagues attributed the pull to “debt account aversion,” the desire to cut the number of open accounts whatever the rate; when the same people were shown the interest their choice would accrue, they made the mathematically optimal call. And Evan McAllister, working from Federal Reserve survey and research data, found a slight majority of people report the avalanche as the more effective method, with the snowball doing better for some people and doing one thing the avalanche does not: changing the habit.

Translated to this schedule, the trade is counted, not felt. The snowball buys its first win in month 7 instead of month 14, and it finishes two months earlier. What it pays is $1,078.50 of interest, all of it on the two cards. If the reader’s last plan stopped at month fourteen because no payoff had happened by then, the $1,078.50 is the price of reaching a finish line at all. The avalanche is the math; the snowball is the follow-through. The plan you finish is the plan that counts.

The consolidation question

The list always raises the question, so here is the cost-benefit in its three numbers. The rate: the 0 percent introductory windows on the September 2026 card list run from 12 to 21 months. The fee: balance-transfer fees run from 0 to 5 percent of the amount moved, as the literature on the transfer puts it. The term: the window’s length, which has to beat the time it takes to pay the balance off. Run a 21-month, 0 percent window against card 1’s 22.15 percent and the window beats the fee, easily; let the balance outlive the window and the debt re-prices at the card’s variable rate, and the schedule resumes at the number in the list. Consolidation moves the debt. It does not erase it, and it does not choose the order. The list still has a rate order and a balance order, and the choice above is the same choice after the transfer.

The decision

The list is four lines. The orders are two. The counted delta is $1,078.50 of interest and two months of time, in opposite directions, on one fixed schedule. Where the $1,000 a month comes from is the budget’s question, not the payoff’s; the emergency fund article on this site is where the reserve behind a schedule like this gets its size.

List them, pick the order, start.