New Zealanders are increasingly turning their backs on major parties, with more than one in three voters set to cast ballots for minor parties at the election.
The shift has been led by a surge in support for the Greens on the left, and on the right, libertarians ACT and populists New Zealand First.
The Greens could be timing their run perfectly, with polls showing the left-wingers have as much as 15 per cent support, well north of their best-ever election result of 11 per cent in 2011.
"I couldn't be prouder of our team, of our effort. There's nothing more we could have done," co-leader Marama Davidson told AAP.
Central to the Greens pitch has been a focus on the cost of living, which Kiwis say is their top issue.
With Labour leaders Chris Hipkins ruling out reform through a capital gains tax or wealth tax, the Greens have jumped into the breach, offering a huge redistributive program.
They propose a wealth tax, a trust tax and a new top income tax rate of 45 per cent set at $NZ180,000 ($A169,000) to fund a suite of measures including income tax relief for lower-income homes, free dental care, and clean energy rebates.
"We're either talking about lifting people's incomes so they've got enough to meet the basics or we're helping to reduce the cost of those basics in really fundamental areas like health care, housing and accommodation and power bills," co-leader James Shaw told AAP.
"Given the pressures that families are under, I think we made the right call to focus on all of our policies through that lens."
Ms Davidson said the Greens' rise was not just a protest vote against a more centrist Labour approach.
"We're putting up the solutions. People actually want a wealth tax. That's not just others having a bad day," she said.
The Greens' bump comes despite a low presence in mainstream media, with the party relying primarily on grassroots and digital campaigning.
In the media spotlight instead is Winston Peters, who is set to return to parliament with NZ First - and possibly decide the contest by siding with centre-right National.
Speaking in Ponsonby on Friday as he cast his ballot, Mr Peters said voters wanted a steady hand in the next government.
Should National win the election as expected, first-term MP Chris Luxon would become prime minister, with 40-year-old David Seymour leading their likely coalition partner ACT.
"We do bring experience and common sense and balance," he said.
"Jim Bolger said so, Helen Clark said so, former Labour cabinet ministers are saying so."
Under Mr Seymour, ACT is another party on the rise.
In 2017 the free-marketers polled 0.5 per cent, three years ago Mr Seymour lifted the vote to 7.6 per cent and on Saturday, a double-digit is possible.
ACT wants huge cuts to the public service and a low-regulation environment to power economic growth.
As Mr Seymour crisscrosses his electorate of Epsom in inner Auckland on the final day of campaigning, he said his voters want a change from business-as-usual.
"We can't go on the way we are. We need not just change but real change with fresh new ideas," he told AAP.
He believes Kiwis will change the government and ACT will be a central part of the incoming coalition.
"Tomorrow, New Zealanders will elect a government that gets us out of the trouble that we're faced over not just the last six years, but actually the last decade or two," he said.
A fourth minor party - the Maori Party, which is polling at two per cent - is also on track to gain.
Co-leader Rawiri Waititi, one of two current Maori Party MPs, said the party would shock with a strong showing in Maori seats.
"On the bad day, we'll take five. On a good day, we're gonna take all seven," he said.
