This article provides general information only and does not constitute personal financial advice. It has been prepared without taking into account your objectives, financial situation or needs. Before acting on any information in this article, you should consider whether it is appropriate for you and seek advice from a licensed financial adviser if necessary.

If you are carrying multiple debts (credit cards, personal loans, buy-now-pay-later accounts), you face a strategic choice: attack the highest-interest debt first to save money, or knock out the smallest balance first to build momentum. The debt avalanche method prioritises mathematical efficiency. The debt snowball method prioritises psychological wins. Both work, but they deliver different results.

What You Will Learn

You will learn how each repayment strategy works, how to calculate the real cost difference, and how to choose the method that fits your financial situation and temperament. By the end, you will have a clear framework for paying off your debt faster.

Step 1: Understand the Debt Avalanche Method

The debt avalanche method targets your highest-interest debt first. You make minimum payments on all debts, then direct every extra dollar to the account with the highest annual percentage rate (APR).

Once that debt is cleared, you roll the freed-up payment into the next-highest-interest debt. According to ASIC MoneySmart, this approach minimises the total interest you pay over the life of your debts (MoneySmart, 2026).

Example: You have three debts. A $15,000 personal loan at 9.5% APR, a $4,000 credit card at 19.9% APR, and a $2,500 buy-now-pay-later account at 0% APR (with a monthly fee). Under the avalanche method, you attack the credit card first because 19.9% is the highest rate, even though the personal loan has the largest balance.

Step 2: Understand the Debt Snowball Method

The debt snowball method targets your smallest balance first, regardless of interest rate. You make minimum payments on all debts, then direct every extra dollar to the account with the lowest balance.

Once that debt is cleared, you roll the payment into the next-smallest balance. The strategy delivers quick wins: clearing a debt in full, closing an account, and seeing your list of creditors shrink. Foundational texts such as Principles of Finance (OpenStax, 2022) explain that behavioural factors often outweigh pure mathematical optimisation in personal finance decisions.

Using the same example: You attack the $2,500 buy-now-pay-later account first, even though it carries the lowest cost, because it has the smallest balance. You clear it in a few months, gain confidence, then move to the $4,000 credit card.

Step 3: Run the Maths

The avalanche method always saves more money in total interest, but the difference depends on the size and rate spread of your debts.

Scenario: You have $500 per month available for debt repayment above minimums. Three debts: $15,000 personal loan at 9.5%, $4,000 credit card at 19.9%, $2,500 BNPL at 0% (with a $10 monthly account-keeping fee).

Avalanche: Attack the credit card first. Total interest paid over the repayment period: approximately $3,200. Time to debt-free: 38 months.

Snowball: Attack the BNPL first, then the credit card, then the personal loan. Total interest paid: approximately $3,650. Time to debt-free: 39 months.

The avalanche saves you $450 and one month. The snowball costs you an extra $450 but delivers two account closures in the first year, compared to one closure under the avalanche.

For debts with tighter rate spreads (for example, two credit cards at 18% and 19%), the cost difference shrinks. For debts with wide spreads (a credit card at 20% versus a car loan at 6%), the avalanche advantage grows.

Read also: HECS-HELP Debt and Your Finances in Australia: When to Pay It Off Voluntarily

Step 4: Factor in Motivation

The snowball method works because it delivers visible progress. Paying off a $2,500 debt feels like a concrete achievement. Chipping away at a $15,000 balance for months without clearing an account can feel discouraging.

Research into behavioural finance shows that people are more likely to stick with a plan that delivers frequent rewards. If you have struggled to stay on a debt repayment plan in the past, the snowball’s early wins may keep you engaged long enough to finish.

Ask yourself: do you need regular proof that the plan is working, or can you stay motivated by tracking total interest saved?

Step 5: Choose Your Strategy

Choose the avalanche if: You are disciplined, you can stay motivated by tracking savings rather than account closures, and your highest-interest debt has a large balance (so the interest savings will be substantial).

Choose the snowball if: You need visible wins to stay on track, you have struggled with debt repayment plans before, or your debts have similar interest rates (so the avalanche advantage is small).

Hybrid approach: Attack your highest-interest debt first, but if one small debt can be cleared in under three months with a moderate extra payment, knock it out early for the psychological win, then pivot back to the avalanche method.

Practical Tips for Either Method

  • Automate extra payments: Set up a recurring transfer to your target debt account on payday. Manual payments invite procrastination.
  • Stop adding to the debt: Freeze the credit cards you are paying down. Cut up the card if necessary. New purchases erase your progress.
  • Use windfalls strategically: Tax refunds, bonuses, and pay rises should go straight to your target debt.
  • Track your progress: Use a spreadsheet or a debt tracker app to see your total debt balance fall each month.

Common Mistakes to Avoid

  • Ignoring minimum payments on other debts: Missing a minimum payment triggers late fees and damages your credit score. The target debt gets the extra payment, but every debt gets its minimum.
  • Underestimating the timeline: Debt repayment takes years, not months. Set realistic expectations or you will abandon the plan when progress feels slow.
  • Choosing the wrong method for your temperament: If you are the type of person who needs quick wins, the avalanche will frustrate you. If you are happy to optimise for savings, the snowball will cost you money.

Frequently Asked Questions

Which method is better for credit card debt?
Both work. Credit cards typically carry high interest rates, so the avalanche saves more money. However, if you have multiple cards with small balances, the snowball delivers faster account closures.

Can I switch methods mid-plan?
Yes. If the avalanche feels demotivating after six months, pivot to the snowball. The important thing is to keep making progress.

What if I can only afford minimum payments?
Neither method works without extra payments. Focus on freeing up cash: cancel subscriptions, sell unused items, or pick up extra shifts. Even an extra $50 per month accelerates your timeline.

Conclusion

The debt avalanche saves you the most money. The debt snowball keeps you motivated with visible wins. Neither method is wrong: the best strategy is the one you will actually finish. Run the numbers for your own debts, assess your temperament honestly, and commit to the plan that fits. Clearing your debts is not a sprint; it is a steady march. Pick your route and start walking.

Interest rates, fees, and terms vary by lender and product as of August 2026. Verify current rates at your lender’s website or via comparison tools at moneysmart.gov.au before making repayment decisions. For personalised advice on debt management, consult a licensed financial adviser or a free financial counsellor through the National Debt Helpline.