Westpac's economists have revised their forecast for house price inflation this year to 11.5% from 6% and say there is a greater likelihood the Reserve Bank will introduce new mortgage lending restrictions.
In the bank's latest Home Truths newsletter, Westpac chief economist Dominick Stephens said the fact that the Auckland housing market had rebounded was not particularly surprising and that tax and mortgage lending restrictions introduced last year were always expected to have a temporary effect on the trajectory of house prices.
"But we must admit that the power and extent of the rebound in March has taken Home Truths by surprise," he said.
And the economics team had upgraded its house price inflation expectations accordingly.
"Our take is that New Zealand's housing market is reacting to the big drop in mortgage rates over the past year.
"Strong population growth and the reasonably firm economy are obviously playing a role, but those factors have been around for a while.
"The big change recently has been interest rates."
This was showing up in the amount of debt households were taking on, with mortgage lending by banks growing at an annualised rate of 8% lately, compared to about 5% a year ago.
"One has to wonder how the Reserve Bank will respond," Stephens said.
"Clearly, the March housing data will be a mark against the idea of cutting the OCR again.
"But ultimately the RBNZ must adhere to its inflation target and there are other factors, such as the strong exchange rate, that are currently suppressing inflation.
"The more likely reaction lies in macroprudential policy.
"If house prices continue on their current trajectory much longer, the RBNZ will start thinking about another round of mortgage lending restrictions."
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