Published: August 2025 · Author: Mike Mortlock, MCG Quantity Surveyors
Overview
MCG's Home Deposit Multiples analysis introduces a single measure of housing affordability pressure: the number of weeks of household income required to save a 20% deposit on the median house in a given market. The metric is described as "a pressure gauge, not a savings timetable". It isn't intended to predict how long a household will actually take to save, but to compare relative deposit pressure across markets.
Methodology
The deposit-multiple calculation assumes households could save 100% of their income, an assumption that never holds in practice. Actual saving timelines depend on after-tax income remaining after essential expenses, which varies meaningfully by market and household composition.
Key Insight
The analysis acknowledges that, in 2025, 20% deposits are not the practical norm. Many Australian buyers now use 10% or even 5% deposits with Lenders Mortgage Insurance (LMI) or guarantor structures. The deposit-multiple measure is therefore best read as a structural pressure indicator rather than a literal target.
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