Australian Property Investing: The Critical Influence of Interest Rates and Capital Gains Tax

Summary: Home Loan Interest Rates primarily dictate the Australian housing market by driving borrowing capacity. The historical drop from 17.5% to sub-4% over three decades fuelled a 412% rise in national house values. While some capital cities still see growth, severe affordability and potential Capital Gains Tax amendments suggest flatter returns for Property Investing ahead.

Australian Residential property has experienced peaks and troughs before. Immigration and other government policies like the recent proposed amendments to Capital Gains Tax have had an influence on people purchasing residential property. Although the greatest influence on the Australian property market has been Home Loan Interest Rates. If Australians believe they can afford the repayments, they will often borrow to invest in real estate.

The banking sector was opened  in 1985, allowing  foreign capital to flow in and out of Australia. This, combined with previous removal of limits the RBA placed on banks re interest rates that could be set, has released more funds into the market. The RBA still sets the Cash Rate, but banks are free to set the retail rates with commercial outcomes front of mind. The RBA has influenced the interest rates – with the aim of full and price stability. However, as you can see from the data below, these interest rate settings and the availability of funds have had a profound affect on the Australian Housing Market.

The Median 3-Year Fixed Rate from September 1990–April 2026 9.300% p.a. When rates are below this level, consumers generally borrow to fuel the property market.

Australian Home Loan Rates vs. House Price Growth (1990–2026)

• The RBA Factor: The correlation between interest rates and house prices is clear: the RBA dropping rates from 17% to 3% over 30 years tripled borrowing capacity, which was the primary driver of house price inflation/growth. The irony being that only new house builds are included in the measure, with rises in established houses excluded.
• Long-Term Trend: Periods of property value growth have been significantly more prominent than declines, lasting an average of 41 months with 34% growth, compared to declines lasting an average of only 12 months with a -4.3% decrease. Moving forward with the current sentiment (influenced by Capital Gains Tax amendments) the housing market is expecting a flatter period. Although Melbourne and Sydney may have a bit of time for wages to catch up with these peaks. Continued strong incomes in Perth (mining) and Brisbane (Olympic Infrastructure spending) should see continued growth, although moderated by the national average. 
• Affordability: In 1990, house prices were roughly four times average household income; by 2011, they were six times the average household income; 2026 8-9 times, Sydney 12 times, Melbourne 9-10 times, Brisbane 8-9 times, Perth 6-7 times

Over the last 40 years, house prices have grown when interest rates settings have provided people with manageable repayments. Whether the growth of houses prices in some areas has resulted in unaffordable repayments, no matter the interest rate setting remains to be seen.