Debt Snowball vs Debt Avalanche — Which Method Should You Use?

By Peakifi Editorial Team · Updated May 2026

This article provides general information only and does not constitute financial advice. For advice tailored to your situation, consult a licensed financial adviser. Learn more.

Contents

Two repayment strategies dominate personal finance advice: the debt snowball (pay smallest balance first) and the debt avalanche (pay highest interest rate first). Both work — the right choice depends on your psychology and financial situation.

The Debt Snowball Method

Order: Pay minimum on all debts, put all extra money toward the smallest balance first, regardless of interest rate.

Once the smallest debt is paid off, roll that payment into the next smallest debt — building momentum like a rolling snowball.

Example:

Debt	Balance	Rate
BNPL	$800	0% (but fees if late)
Credit card	$2,500	20%
Car loan	$8,000	10%
Personal loan	$12,000	12%

Snowball order: BNPL → Credit card → Car loan → Personal loan

Advantages:

Psychological wins — eliminating a debt entirely motivates continued effort
Fewer accounts to track as debts disappear
Effective for people who’ve tried and failed to pay off debt before

Disadvantages:

Mathematically pays more in total interest than avalanche
May feel inefficient to more analytical thinkers

The Debt Avalanche Method

Order: Pay minimum on all debts, put all extra money toward the highest interest rate debt first.

Example (same debts as above):

Debt	Balance	Rate
Credit card	$2,500	20% ← attack first
Personal loan	$12,000	12% ← next
Car loan	$8,000	10% ← next
BNPL	$800	0% ← last

Advantages:

Minimises total interest paid
Mathematically optimal — you will pay less over the life of all debts
Logical, numbers-based approach

Disadvantages:

If the highest-rate debt is also a large balance, it takes a long time before any debt is fully paid off
Some people lose motivation without visible wins

How Much Difference Does It Make?

The gap between snowball and avalanche depends on the specific debts. For many Australians with standard credit card and personal loan debt, the total interest difference is typically in the hundreds to low thousands of dollars over the life of the repayment plan.

What matters more than the method: paying something extra each month, consistently.

Which Method Should You Choose?

Choose Snowball if…	Choose Avalanche if…
You’ve struggled to maintain motivation with debt repayment before	You are motivated by data and efficiency
You have several smaller debts you could knock off quickly	Your highest-rate debt is not much larger than other debts
You find psychological wins energising	You are confident you’ll stay the course regardless of wins
You’ve tried avalanche before and lost momentum	You want to minimise total interest paid

The bottom line: The method you stick with is the best method. Both will get you out of debt faster than making minimum repayments.

Combining the Methods

Some people use a hybrid approach:

Pay off one or two very small debts quickly (snowball) to reduce account complexity
Switch to avalanche to tackle the remaining larger, high-interest debts

FAQ

What about HECS-HELP debt — does it fit into snowball or avalanche? HECS is indexed to CPI (not a standard interest rate) and is repaid automatically via PAYG. Most financial advisers suggest prioritising high-interest commercial debt (credit cards, personal loans) before voluntarily paying extra on HECS.

Can I use the snowball method on a mortgage? The same principles apply — some homeowners focus on paying off their mortgage before other goals. However, given that mortgage rates are typically lower than credit card or personal loan rates, the avalanche method would prioritise the mortgage last.

Does the method affect my credit score? The repayment method itself doesn’t affect your credit score — but paying down balances does. Reducing credit card utilisation is one of the faster ways to see credit score improvement.