Debt snowball vs avalanche: how each payoff order works

Guide · Updated 2026-11-10

How the snowball and avalanche methods decide which debt to clear first, why rolling payments forward speeds things up, and how to compare both with the debt payoff tool.

Open the Debt payoff Free, in your browser, nothing uploaded.

Owing money in several places is tiring: different due dates, different rates, and no clear sense of an end. The debt payoff tool takes a list of debts and an extra monthly amount, then shows three plans side by side: the snowball order, the avalanche order and paying only the minimums. Each plan shows the months to debt-free, the interest paid and the order in which debts disappear. It is for anyone juggling cards, loans or overdrafts who wants a plan they can follow. For a closer look at one card, use card payoff; for one loan with lump-sum payments, the loan payoff planner; and to find the extra money in the first place, the budget planner.

What it is

Both methods share one rule. You keep paying the minimum on every debt, and you put one extra sum toward a single target debt. When that debt is paid off, everything you were paying on it moves to the next target. Your total monthly payment never goes down, so each new target gets cleared faster than the last. That growing payment is the “snowball”.

The two methods differ only in which debt is the target:

• Snowball picks the smallest balance first. You see a debt vanish early, which many people find motivating.
• Avalanche picks the highest interest rate first. Expensive debt shrinks soonest, so it usually costs the least in interest.

Each month the tool adds interest to every balance:

interest = balance × APR ÷ 12

• APR is the yearly rate, as a decimal (18% is 0.18).

It then pays the minimums, and sends everything left of the total budget to the target. The total budget is the sum of all minimums plus your extra amount.

The third column, minimums only, pays each minimum and nothing more. When one debt is cleared, its payment is not moved on. It shows what happens without a plan.

How to use it

1. Fill in a row for each debt: a name, the balance, the APR and the minimum monthly payment. The tool starts with four sample rows that you can overwrite.
2. Press Add a debt for another row (up to 12), or Remove to drop one.
3. Type the extra amount you can pay each month on top of all the minimums.
4. Read the three columns. Each gives the months and years to debt-free, the total interest and the order debts are paid off, with the month each one goes. The plan that costs less interest is highlighted.
5. Check the chart, which traces the total owed month by month for all three plans.
6. Download the month-by-month CSV if you want a table to tick off as you go.

A worked example

Sam has four debts and can find 150 a month extra:

• Main card: 2,400 at 21%, minimum 60
• Personal loan: 6,000 at 11%, minimum 180
• Store card: 650 at 27%, minimum 25
• Overdraft: 1,200 at 16%, minimum 40

That is 10,250 owed. The minimums add up to 305, so Sam’s total budget is 305 + 150 = 455 a month.

• Snowball: store card gone in month 4, overdraft in month 10, main card in month 19 and personal loan in month 27. Interest is about 1,674.72.
• Avalanche: store card in month 4 (it has the highest rate as well as the smallest balance), main card in month 15, overdraft in month 18 and personal loan in month 27. Interest is about 1,630.80.
• Minimums only: 70 months, nearly 6 years, and about 3,638.06 in interest.

Both plans finish in 27 months, and avalanche saves only about 43.92. Here the difference is small, so Sam could reasonably pick whichever order he is more likely to stick with, since habit matters as much as the small saving. Either plan saves around 2,000 in interest and more than three years against paying minimums alone.

Where it is used

• Household debt plans: families list every card and loan in one place and agree on one order to follow.
• Money advice and coaching: an adviser can show a client both methods with the client’s own numbers, rather than arguing for one in theory.
• After a pay rise or a windfall: typing a bigger extra amount shows how many months it takes off.
• Before taking a consolidation loan: comparing the snowball result with a loan’s total cost shows whether merging debts really helps.
• Workplace money workshops, where the chart of total owed makes the minimum-payment trap easy to see.

Common mistakes

1. Leaving out a debt. A forgotten overdraft or phone plan still costs interest and needs its minimum. List everything.
2. Using a minimum that will change. Card minimums often shrink as the balance falls. The tool holds each minimum fixed, which is fine for a plan, and the plan assumes at least that amount keeps being paid even if the card asks for less.
3. Counting extra money you do not have. An extra amount you cannot keep up breaks the plan. Use a figure from a real budget.
4. Ignoring fees for paying early. Some loans charge for early repayment. Check the official source, your loan agreement, before aiming extra money at one.
5. Adding new debt along the way. The plan only works if the balances only go down. New borrowing would need to stop while the plan runs.

Questions people ask

What if two debts have the same balance or rate? The tool breaks the tie with the other measure: for snowball, the higher rate goes first; for avalanche, the smaller balance.

Should I save while paying off debt? Many people keep a small emergency fund so a surprise bill does not go back on a card. How much is a personal choice; this tool does not decide it for you.

Does a 0% debt belong in the list? Yes. Type 0 as its APR. Avalanche will leave it until last, and it will still need its minimum each month.