|Adjustments||Not Seasonally Adjusted|
|Source||Commonwealth Bank Housing Industry Association Australia|
|Release||Housing Affordability Index|
|Residential Building Permits||Nov 2020||17,205||16,775||#, SA||Monthly|
|Building Completions||2020 Q3||28,971,228||29,560,736||Ths. Ch. AUD, SA||Quarterly|
|House Price Index||2020 Q3||148.68||147.61||2011-2012=100 Index, SA||Quarterly|
|House Price Value||2020 Q3||548,921||550,175||AUD, NSA||Quarterly|
|Housing Starts||2020 Q3||26,726||25,691||#, SA||Quarterly|
|Non-residential Building Completions||2020 Q3||11,750,805||12,170,427||Ths. Ch. AUD, SA||Quarterly|
|Residential Building Completions||2020 Q3||14,803,869||15,091,391||Ths. Ch. AUD, SA||Quarterly|
|Residential Housing Starts||2020 Q3||15,270||16,669||#, SA||Quarterly|
For Australia, the HIA (Housing Industry Association) Housing Affordability Index measures accessibility to home ownership for an average first home buyer. A result of 100 means that 30% of earnings are absorbed by mortgage repayments. A value above (below) 100 means the mortgage burden is more (less) manageable.
It is measured by the ratio of average income per household to the income necessary to be able to meet repayments (repayment burden) on an average established dwelling purchased by first home buyers (qualifying income). Thus an increase in the ratio represents an improvement in affordability while a decline represents a deterioration in affordability.
Seasonality: The components used in construction of the index are seasonally adjusted, but the index itself is not seasonally adjusted after construction. The index is compiled in a way that means it does not have seasonal characteristics.
In calculating the index is estimating the value of a mortgage repayment representative of someone who purchased a home during the reference period. This requires a number of assumptions. A mortgage repayment is dependent on the size of the loan, the prevailing mortgage interest rate, and the mortgage term.
Qualifying income is a notional amount at which mortgage repayments are equivalent to exactly 30 per cent of income (the lowest income level at which the mortgage repayment would be affordable):
The affordability index is calculated by dividing the actual level of earnings by the qualifying income:
The affordability multiple describes the multiple of average full-time earnings required to affordably service mortgage repayments under prevailing conditions. The affordability multiple is calculated as follows:
The affordability index levels for all previous quarters have been revised to reflect the CoreLogic RP Data price series.
The HIA-Commonwealth Bank (HIA-CBA) Housing Affordability Index was a joint project. Between 2014 and 2017, it ceased to be co-branded.
The Housing Industry Association Limited (HIA) is a national industry association of residential builders and suppliers. It was formed in 1965, as an extension of a regional assocation (the Builders and Allied Trades Assocation, BATA) formed in 1946.
Commonwealth Bank (CBA) is Australia's leading provider of integrated financial services.