It's still worthwhile investing in residential rental properties, although if interest rates rise further the shine could come off them, according to Westpac's chief economist Dominick Stephens.
In his latest Home Truths newsletter, Stephens said that once maintenance costs and management fees were taken into account, the net yield on a rental unit was generally less than the interest rate on the mortgage that financed its purchase.
Investors were only willing to accept such low yields because they anticipated making capital gains, Stephens said.
In the early 2000s, interest rates were low and so were house prices relative to rents, so a long term capital gain of 3% was sufficient to allow the investment to break even.
"No wonder there was such a craze for property investment at the time," he said.
Then as house prices and interest rates rose during the 2000s, so did the amount of capital gain required to make the investment worthwhile.
Westpac estimated that at one point a long term gain of 5.7% would have been necessary to justify investing in an average house.
That had since dropped back to around 4.4%, which was under Westpac's forecast of 5% house price inflation this year.
However the calculation was based on a mortgage interest rate of 6.3%.
"Should interest rates rise in the future, as we suspect they will, the required capital gain may once again rise into unrealistic territory," Stephens said.
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