6503.0 - Household Expenditure Survey and Survey of Income and Housing, User Guide, Australia, 2015-16  
ARCHIVED ISSUE Released at 11:30 AM (CANBERRA TIME) 10/10/2017   
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The SIH and HES contain a wide range of variables that directly relate to many aspects of people's housing. These include tenure, dwelling structure, and number of bedrooms. Others will be outlined in more detail below.


Housing costs are regular outlays made by household members in providing shelter for themselves. The data collected on housing outlays in the SIH are limited to major outlays on housing, i.e. mortgage repayments, rent, property and water rates as well as body corporate fees.

Only payments that relate to the dwelling occupied by the household at time of interview, i.e. a respondent's usual place of residence, are included. Housing costs only include mortgage/loan repayment if the purpose of the loan at the time it was initially taken out was primarily to buy, build, add to, or alter the occupied dwelling.

There are a number of limitations with the housing costs information obtained in the SIH, due to practical data collection considerations. These limitations should be especially borne in mind when comparing the housing costs of different tenure and landlord types, i.e. when comparing the costs of owner occupiers with the costs of renting households, and when comparing the costs of households renting from state and territory housing authorities with the costs of other renters.

  • Some households are reimbursed some or all of their housing costs. Commonwealth Rent Assistance (CRA), paid by the Australian Government to qualifying recipients of income support payments, is an important type of reimbursement of relevance to these statistics.
  • Mortgage repayments made by owners with a mortgage include both the interest component and the principal or capital component. For many purposes it is more appropriate to consider repayments of principal as a form of saving rather than as a recurrent housing cost. It reflects the purchase of a housing asset by increasing the equity in the property held by the household and is an addition to the wealth of the occupants.
  • A fuller measure of housing costs would include a range of outlays not collected in the SIH but which are necessary to ensure that the dwelling can continue to provide an appropriate level of housing services. These include repairs, maintenance and dwelling insurance, and are costs that tend to be incurred by owner occupier households but not by renting households. These additional costs are measured in the HES.


Housing costs are often a major component of total living costs. Therefore housing costs are often analysed as a proportion of total income, sometimes referred to as affordability ratios. However, comparisons between these measures are subject to the limitations of housing cost estimates obtained in the SIH that are described in the previous paragraph. Housing affordability ratios derived from SIH data are further impacted by the inclusion of CRA in the value of income collected.

To illustrate the difficulties discussed above, consider two households that are renting their dwellings. Both receive government pensions of $400 per week. One rents from a public housing authority and pays rent of $100 per week. The other pays $135 rent per week to a private landlord and receives CRA of $35. In SIH, the housing costs of the latter household would be recorded as $135 and their income would be recorded as $435. The household renting from the public housing authority has a housing costs/income ratio of 25%. The housing costs/income ratio for the latter household would be derived as 31%. If CRA receipts are excluded from housing costs and income, the housing costs/income ratio for the latter couple is also 25%, highlighting that there is no substantive difference between the housing costs or income situation of the two couples. The treatment of CRA is of particular concern when considering changes in affordability ratios over time, since there has been a shift from providing public housing to providing CRA as a means of supplying affordable housing to low income people.

While housing costs can be a major component of total living costs, the difference between the housing costs of a larger household and a smaller household would not be expected to be as great as the difference in many other costs, such as food or clothing. In other words, larger households can be expected to experience economies of scale in the supply of housing. This means that if a larger household and smaller household both have the same standard of living, it could be expected that on average the larger household will have a lower housing cost to income ratio. Therefore relatively high housing cost to income ratios are more of a concern with respect to larger households than smaller households. This should be borne in mind when comparing ratios across different household sizes.

In comparing households' housing costs with their income, it should be noted that households have a variety of housing preferences. Some people may choose to live in an area with high land values because it is close to their place of employment and therefore they have lower transport costs. Some people choose to incur relatively high housing costs because they prefer a relatively high standard of housing to other consumption or investment choices. High mortgage repayments might reflect a choice to purchase a relatively expensive home, or pay off a mortgage relatively rapidly, as a form of saving.


One way of examining housing affordability is to look at households whose spending on housing is likely to impact on their ability to afford other living costs such as food, clothing, transport and utilities. A common threshold applied is the proportion of households spending more than 30% of their income on housing costs.

Higher income households have greater capacity to spend a high proportion of their income on housing without impacting their ability to meet other living costs. Accordingly, a 30% housing costs threshold is commonly applied to those households whose equivalised disposable household income falls in the bottom 40% of Australia’s income distribution. This is commonly referred to as the '30/40 rule' of housing affordability. Lower income households that spend more than 30% of their gross income on housing costs are sometimes referred to as being in ‘housing stress’.

Most affordability measures, including the 30/40 rule, exclude households that report nil or negative income. The 30/40 rule may also exclude those reporting extremely low incomes, such as those in the bottom 2% of the equivalised disposable household income distribution, as data suggests this group includes households with temporarily low or irregular incomes, or accumulated wealth that supports their consumption.

Measures of housing affordability are often restricted to renters as the nature of mortgage repayments can make affordability analysis of owners with a mortgage difficult.


The concept of housing utilisation applied in the SIH and HES is based upon a comparison of the number of bedrooms in a dwelling with a series of household demographics such as the number of usual residents, their relationship to one another, age and sex. There is no single standard measure of housing utilisation. However, the Canadian National Occupancy Standard (CNOS) is applied in the SIH and HES and is widely used internationally.

The CNOS is sensitive to both household size and composition. The measure assesses the bedroom requirements of a household by specifying that:
  • there should be no more than two persons per bedroom;
  • children less than five years of age of different sexes may reasonably share a bedroom;
  • children less than 18 years of age and of the same sex may reasonably share a bedroom;
  • single household members 18 years and over should have a separate bedroom, as should parents or couples; and
  • a lone person household may reasonably occupy a bed sitter.

The CNOS variable compares the number of bedrooms required with the actual number of bedrooms in the dwelling. Households living in dwellings where this standard cannot be met are considered to be overcrowded.

From 2017-18 onwards, the number of part-time resident children in each household will be collected in the SIH. It is expected that this information will provide additional detail in regards to housing utilisation.


Summary housing data from SIH 2015–16 will be released in the publication Housing Occupancy and Costs, Australia (cat. no. 4130.0).