Debt Snowball vs Avalanche: Which Pays Off Debt Faster?

If you owe money in several places, the question is not just how much to repay but where to send each extra dollar. The two best-known answers are the debt snowball and the debt avalanche. One is built around maths, the other around motivation, and the research suggests both camps have a point. This guide compares them with a worked Australian-style example and covers when consolidation fits in.

What is the difference between the debt snowball and the debt avalanche?

Both methods start the same way: pay the minimum on every debt, then put all spare money towards one target debt. When that debt is gone, its repayment rolls onto the next. The only difference is the order.

• Debt snowball: target the smallest balance first, regardless of interest rate.
• Debt avalanche: target the highest interest rate first, regardless of balance.

How does the debt avalanche work?

This is the method ASIC's Moneysmart describes in its guide to getting debt under control (updated August 2026): pay the minimum on all debts, put extra money towards the debt with the highest costs (fees and interest rate), and repeat until the debts are cleared. Moneysmart notes this method saves more on interest over time.

1. List every debt with its balance, interest rate, fees, minimum repayment and term. Include buy now pay later, store cards and unpaid bills.
2. Cover priority bills first. Moneysmart lists rent or mortgage, council rates, utilities and essential car repayments as higher priorities.
3. Work out your "debt money": what is left after essential expenses and minimum repayments.
4. Pay minimums on everything so nothing falls into arrears.
5. Send all extra money to the target debt: the highest rate for the avalanche, the smallest balance for the snowball.
6. Roll the freed-up repayment onward when a debt is cleared, and repeat.

Which method saves more money?

The avalanche, almost by definition, because the most expensive debt shrinks fastest. How much it saves depends on how far apart the rates are.

An illustrative example: a $2,000 personal loan at 10% (minimum $80), an $8,000 credit card at 20% (minimum $240) and a $14,000 car loan at 9% (minimum $350), with $1,000 a month available in total. Using simplified assumptions (monthly interest, fixed minimums, no fees or new spending):

• Snowball: first debt gone in month 6, debt-free in month 28, about $3,550 in interest.
• Avalanche: first debt gone in month 17, debt-free in month 28, about $3,350 in interest.

Here the avalanche saves around $200 but the snowball delivers its first win 11 months sooner. Make the credit card larger, or its rate higher, and the gap widens.

At population scale the cost adds up. A 2023 study in the Southern Economic Journal used US household survey data and estimated that households following the snowball pay an additional 1.8% to 4.3% in interest compared with the interest-minimising approach, with larger penalties for lower-income households.

Does the snowball method actually help people get out of debt?

There is reasonable evidence that it helps some people stick with it. Kellogg School researchers David Gal and Blake McShane analysed data from nearly 6,000 clients of a US debt settlement firm (Journal of Marketing Research, 2012). The share of accounts a person had closed better predicted eliminating their debt than the share of dollars repaid. The authors caution that the two measures are highly correlated.

A 2016 Journal of Consumer Research paper by Kettle, Trudel, Blanchard and Häubl found that concentrating repayments on one account boosted motivation more than spreading them evenly. In one experiment, concentrated repayment led to debts being repaid 15% faster. The effect was strongest when repayments went to the smallest accounts.

Two caveats: this research comes from the US and Canada, and much of it involves people in debt programs, not everyone with a credit card. And motivation is a real input. A cheaper plan you abandon in month four costs more than a slightly dearer plan you finish, the same problem covered in why motivation fails.

Which method should you choose?

Moneysmart's summary is the right one: choose the method you can stick with. Some practical rules of thumb:

• Rates are similar (several cards at around the same rate): the snowball costs little extra and may keep you going.
• One debt is much dearer (a 20% card next to a 9% car loan): the avalanche usually saves meaningfully more.
• A hybrid: clear one or two tiny balances for momentum, then switch to the avalanche.

Where do buy now pay later, HELP debt and the mortgage fit?

Buy now pay later belongs on the list; Moneysmart specifically includes it. Small BNPL balances are often the quickest snowball wins, and clearing them removes missed-payment risk.

HELP debt usually sits outside the plan because compulsory repayments are income-contingent and deducted through the tax system. A home loan is normally the lowest-rate, longest debt, so it rarely becomes the target; extra money in an offset account can still reduce its interest.

Lenders also look at your debts when you apply for a home loan, including credit card limits you are not using. See how to increase your borrowing power.

Is debt consolidation better than snowball or avalanche?

Consolidation rolls several debts into one loan with one repayment. It can help, but Moneysmart's page on debt consolidation and refinancing warns it can cost more if the rate, fees or term increase. Its example: a $20,000 debt at 10% over 5 years costs $25,496 in total, while the same debt at 6% over 15 years costs $30,379. A lower rate stretched over a longer term can mean more interest overall.

Moneysmart says consolidation may help when you pay less overall, the term is not longer, you can afford the repayment and you stop using the old credit. Turning unsecured debt into debt secured against your home also puts the home at risk if repayments are missed. If you are weighing up consolidating into a home loan, NewGen Finance Brokers' debt consolidation page outlines how it models the current debts against the proposed structure before anyone applies (NewGen is TodayForge's sister business). Snowball and avalanche are free and need no new credit.

What mistakes stall debt repayment?

• Adding new debt while paying old debt down. Close or cut limits on cleared cards if you can.
• Having no cash buffer, so the next surprise lands on the card. A small emergency fund breaks that loop.
• Skipping a budget, so the "debt money" figure is a guess. The 50/30/20 rule is a fast starting point.
• Paying for a quick fix. Moneysmart warns about debt management firms that make unrealistic promises.

If repayments are already unmanageable, talk to your lenders about hardship arrangements and call the free National Debt Helpline on 1800 007 007 (ndh.org.au).