The Government will pour close to $4 billion into a scheme to accelerate the pace of new house builds, which is expected to help see "tens of thousands" of new properties built.
It is also doubling the capital gains tax-esque bright-line test from five to 10 years - meaning any gains on a residential property that is not a family home will be taxed if the property is sold within 10 years of purchase.
Read more: What the changes mean for first home buyers
'Bizarre, crazy': Landlords shocked at Government's housing plans
And first home buyers have also been given a lifeline – the First Home Grant caps have been lifted from $85,000 to $95,000 for single buyers, and from $130,000 to $150,000 for two or more buyers.
The cap on the value of the house those eligible for this grant are able to buy has also been lifted by up to $100,000 in some parts of the country.
Prime Minister Jacinda Ardern said this housing package would increase the supply of houses and remove incentives for speculators.
"This is a package of both urgent and long-term measures that will increase housing supply, relieve pressure on the market and make it easier for first-home buyers."
Ardern said New Zealand's housing crisis is "long standing" and today's new measures will help to start fixing this issue.
"The need for further action is clear - the last thing [we need] right now is a property bubble."
But she said without intervention, that is where New Zealand is heading.
She said the rate of house price growth in New Zealand has been "unsustainable".
"The housing crisis is a problem decades in the making that will take time to turn around, but these measures will make a difference."
Today's announcement would help to dampen property speculation. It will make residential property "less lucrative" for speculators.
Ardern said it was her view that today's announcement "will make a difference".
She said the Government was helping to "bring down the heat" in the market.
But she said the housing crisis was "complex" - but the Government is trying to "tilt" the market to first home buyers.
The housing acceleration fund announcement will also help with supply - by helping to establish basic infrastructure, such as making vacant land ready to build on.
The plan is the largest spend of this kind since the 1970s, Ardern said.
The plan contains a plethora of new initiatives:
• $3.8b for accelerating housing supply
• First Home Grant caps lifted, as well as higher house price caps
• Bright-line test doubled from 5 to 10 years
• Interest deductibility loopholes scrapped
• Govt to offer Kāinga Ora $2b loan to scale up land acquisition
• The Apprenticeship Boost scheme extended
The lifting of the First Home Grant caps will help more people on to the property ladder, Finance Minister Grant Robertson said.
Robertson said: "Housing bubbles are unstable."
The grant means those eligible can get $5000 to buy an existing property, or up to $10,000 for a new property.
By increasing the income caps from $130,000 to $150,000, approximately 9300 additional couples and 3700 additional singles who are currently renting will now newly qualify for the First Home Loan and Grant.
The Government has also announced it is upping the cap on how much a home has to cost, for someone to be eligible for the grant.
The changes to the house price and income caps will take effect on April 1, 2021.
Robertson said the bright-line test extension would help curb "rampant speculation" in the housing market.
The bright-line test is similar to a capital gains tax (CGT) on housing. It means people have to pay tax on any gains on the property if it's sold within 10 years.
There are, however, a number of exceptions – such as an exemption for a family home.
The Government has announced it intends to extend the bright-line period to 10 years for residential property except for newly built houses, which will stay at 5 years.
The Government will pass the new bright-line test rules later today under urgency.
Ardern said extending the bright-line test was not breaking her no capital gains tax promise.
Ardern said the Government was "silent" on the bright-line test before today, but the problem has become "significant".
Robertson said he was "too definitive" when he ruled out changes to the bright-line test.
But Ardern said at the time, they were not seeing the "rampant" increases.
Robertson ruled out the changes in September last year and Ardern said making the change now was not a broken promise.
Robertson said that officials had advised that house prices would fall as a result of Covid-19; but he said the opposite happened.
Robertson said the Government would monitor the impact of these changes on the rental market.
Housing Minister Megan Woods said the new money for the housing acceleration fund – some $3.8b – will help greenlight tens of thousands of house builds in the short to medium term.
"This fund will jump-start housing developments by funding the necessary services, like roads and pipes to homes, which are currently holding up development."
Woods said it has become clear there is a "clear market failure" in New Zealand's "broken" housing market with the inaccessibility of infrastructure on vacant land.
Woods said that a lack of housing infrastructure has been a stumbling block for years.
She said the package the Government is releasing today is "unique" by bringing together land and infrastructure.
"This package will accelerate the building of new houses, in the right place."
Ardern said she is expecting "tens of thousands" of new homes to be built because of this package.
She said the number one issue that has been raised by developers and councils is the fact there is not enough housing infrastructure in place.
Woods said the money she is dishing out will start to be spent in the second half of this year.
As well as this, the Government will allow Kāinga Ora, the Crown housing agency, to borrow a further $2b for it to buy land for housing.
Meanwhile, the Government will get rid of the interest deductibility loophole – a rule which allows property owners to claim interest on loans used for residential properties as an expense against their income from those properties.
Revenue Minister David Parker said this rule favours debt-driven residential property investment over more fully taxed and more productive investments.
"To reduce investor demand for these investments, the Government will remove the advantage investors have over first home buyers."
And in a bid to get more houses built, the Government is bolstering its apprenticeship scheme, the Apprenticeship Boost initiative
The scheme is being extended by four months to further support trades and trades training.
It means employers who have apprentices starting over those extra four months can get some Apprenticeship Boost support as well, which could see more than 5000 new apprentices able to benefit.
Auckland Mayor Phil Goff has welcomed the Government's housing package as a "good step in the right direction".
"In particular, I welcome the Government's commitment of $3.8 billion to build infrastructure and accelerate home building," he said.
"The cost of infrastructure rather than availability of land is the major constraint Auckland faces in increasing home building. A fair share of this fund for Auckland will help ensure the infrastructure such as roading, water and public open space is in place to enable building to go ahead."
Goff said the measures would help first-home buyers but he warned it would take time before the benefits were realised.
Andrew King, NZ Property Investors Federation president was taken aback by the Government decision to eliminate interest rate tax deductions, which investors can currently claim on properties.
"What, so every other business in New Zealand can still claim tax deductions, but not landlords?" King asked. "You're joking! This is just bizarre, it's crazy."
The sums involved could be tens of millions of dollars, King said, and that would now be lost to landlords, already struggling under Residential Tenancies Act changes from last month which swung the power in tenants' favour.
The Government will now stop landlords claiming interest on loans for rental properties as an expense against their income from those properties and other forms of income such as wage and salary earnings.
King said: "We all know one of the major downsides for investors in property is that the rent doesn't cover the costs of running many places. in New Zealand, it's cheaper to rent than to buy a house.
"This change will make it almost impossible for people to provide new rental accommodation. This means the only people able to buy rental properties in the future will be those with almost all the cash to pay for the property."
- additional reporting Anne Gibson
About 50 people attended a public meeting to discuss homelessness in Rotorua.