Making investors stump up a deposit of nearly $400,000 for the average Auckland home is expected to dampen house price inflation by up to 5 per cent.
Tenants have been warned by a property investors' lobby group that rents will increase under the tough new lending restrictions outlined by the Reserve Bank yesterday.
But the move to target investors was welcomed by Prime Minister John Key, as well as Labour and the Green Party.
Key said the proposals - which banks are expected to enact immediately - were only a part of the housing solution, but were likely to benefit first-home buyers.
"In theory it helps a little bit because what it essentially does is it makes it a little bit more difficult, and a little less economic for an investor to buy a property."