Surging Auckland house prices would put New Zealand's lenders at risk if there was a significant downturn, according to the Reserve Bank, which was happy with the lenders' ability to stay within regulatory requirements just six months ago.
The central bank is seeking feedback on plans to impose new macro-prudential restrictions on residential property investors' ability to buy highly-leveraged housing, which it sees as the biggest risk to the country's financial stability.
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When the central bank ran stress tests on New Zealand's financial system last year, it found the country's lenders could withstand a significant housing market downturn concentrated in Auckland, with capital ratios falling to within 1 per cent of the minimum requirements.
Since the scenarios for the test were finalised early last year, Auckland house prices have climbed 18 per cent and the bulk of lending has gone to Auckland, with property investors' share of residential housing purchases increasing.