Debt snowball vs avalanche: which one gets you a date — and how to pick in five minutes
Snowball pays smallest balance first, avalanche pays highest rate first. Here is what each one costs in interest and months, and a simple rule for choosing.
Every debt payoff plan is the same plan underneath: pay every minimum, put everything extra on one debt, and when that debt is gone roll its minimum onto the next. The only decision is the order. Snowball orders by balance, smallest first. Avalanche orders by interest rate, highest first. People argue about this as if it were religion. It is arithmetic, and the arithmetic is small.
What the two orders actually cost
Take four debts: a $900 store card at 24%, a $3,200 credit card at 21%, a $6,500 car loan at 7% and a $1,400 medical bill at 0%. Minimums total $330 a month; you have $250 extra.
Avalanche attacks the 24% card, then the 21% card, then the 7% loan, then the 0% bill. It is debt-free in about 36 months and pays roughly $1,700 in interest.
Snowball attacks the $900 card, then the $1,400 bill, then the $3,200 card, then the loan. It is debt-free in about 37 months and pays roughly $1,950 in interest.
One month and about $250 apart over three years. That is the typical gap: avalanche wins on paper by a few percent, and the more your rates differ, the bigger its lead. Snowball wins on something the maths does not show — the first debt disappears in four months instead of ten, and people who see a balance hit zero early tend to keep going.
The rule for choosing
Ask one question: have you started and stopped a payoff plan before?
If yes, use snowball. The interest you “lose” is the price of a plan you will actually finish, and it is cheap. If no — if you are the kind of person who can watch a big number fall slowly without losing faith — use avalanche and keep the interest.
There is a third option worth knowing. Sort by rate, but if a debt can be cleared in under two months, take it first regardless. You get the early win and lose almost nothing. Most spreadsheets can model it as avalanche with a manual override on the order column.
The number that matters more than the order
Whichever order you choose, the thing that moves the date is the extra payment. In the example above, raising the extra from $250 to $350 shortens the plan by eight months and saves more interest than switching methods ever would. Cancelling one subscription and adding it to the extra beats a week of reading comparison articles.
Two rules make the extra stick. First, automate it on payday so it leaves before you see it. Second, when a debt clears, do not let its minimum drift back into spending — that roll-over is the whole engine of both methods.
How to know you are on plan
A plan is a schedule: this month, this much to this debt, this balance afterwards. The check each month is simple: does the actual balance match the plan’s balance for this month? If it is higher, either a minimum was missed or the extra shrank. If it is lower, something good happened — keep it.
The Debt Payoff Ritual spreadsheet builds the schedule for you: type up to twelve debts with balance, rate and minimum, pick snowball or avalanche and an extra amount, and it produces a month-by-month plan for 120 months with every roll-over handled, the interest you avoid counted, and a debt-free date. The first-of-the-month page shows one number — the date — and three verdicts: did every payment happen, is the extra on the right debt, is the total falling as fast as the plan says. If you would rather do it on paper, the Debt Payoff Binder is the same plan as a printable, with a thermometer to colour in.
Pick an order today. Then find $50 more for the extra. The second one matters more.
