What is mortgage stress in Australia?

Mortgage stress is usually understood as the pressure a household faces when meeting home-loan repayments becomes difficult. In Australia, it is often discussed in terms of the share of income spent on repayments: when that share is high, or when interest rates or living costs rise, more households can find themselves under stress even if they are not yet in arrears.

Stress is not the same as default. Many households in stress continue to pay on time by cutting spending or drawing on savings. So mortgage stress is a measure of vulnerability and pressure, not only of observed delinquency.

A common rule of thumb in Australia is the 30/40 rule: spending more than 30% of pre-tax income on mortgage repayments is often treated as a stress threshold. Some analyses use 40% or other benchmarks. These rules are simple but have limits: they do not capture savings, other debt, or household-specific circumstances.

At a national level, stress is often inferred from aggregate data—interest rates, household income and debt, unemployment, and cost of living—rather than from a single survey question. That is why simple definitions can be incomplete: real-world stress depends on many factors that vary by household and over time.

The main drivers of mortgage stress in Australia are well understood. Repayment burden rises when interest rates go up or when loan sizes are large relative to income. Income and employment matter: job loss or reduced hours make it harder to service debt. Cost of living—inflation, energy and other essentials—reduces the income left after repayments. Household buffers, such as savings or equity, affect how long a household can absorb shocks before falling into difficulty.

These factors are combined in different ways by researchers and policymakers. No single number captures every dimension, but aggregate indicators can show how conditions are changing over time.

Mortgage stress refers to pressure or vulnerability: the risk that repayments could become unmanageable, or that a household is already stretching to pay. Arrears means payments are late or missed. Default is a formal failure to meet the loan contract, which can lead to enforcement or loss of the property.

Stress can exist without arrears; arrears can exist without default. Many stressed households never miss a payment. Tracking stress helps understand how many households are at risk before problems show up in arrears or default data.

National mortgage stress conditions change as the economy and policy change. Interest rate rises increase repayment burdens. Strong employment and wage growth can ease pressure. House prices and lending standards affect how much debt new borrowers take on. Inflation and energy costs shift how much income is left after essentials.

Because these factors move over time, a useful view of mortgage stress is one that can be updated regularly and compared with the past—so you can see whether conditions are tightening or easing at a national level.

The Australian Mortgage Stress Index (AMSI) is a national indicator that tracks aggregate mortgage stress conditions over time. It combines factors such as interest rates, labour market conditions, inflation, and housing and credit data into a single 0–100 score, updated periodically as new data is released.

AMSI does not replace household-level or loan-level analysis. It is designed to give professionals and policymakers a clear view of how national conditions are evolving—whether stress is rising, easing, or stable—and to support discussion and research. The current reading, historical chart, and monthly releases are on the dashboard; past readings are in the releases archive. For how the index is built, see the methodology; for data sources, see data sources.