Oxfam has urged the Tax Working Group to crack down on tax avoidance by the very rich after new stats showed the top one per cent took home 28 per cent of 2017's wealth.
Data compiled by Oxfam showed the top 10 per cent took more than half of the wealth created last year - just two men own more than the poorest 30 per cent of New Zealanders - about 1.4 million people.
Those 1.4 million took just one per cent of the wealth created and about 90 per cent of Kiwis own less than half of New Zealand's wealth.
Oxfam New Zealand chief executive Rachael Le Mesurier, speaking this morning to TVNZ 1's Breakfast, said this is a dramatic demonstration of inequality, which can have other negative effects like eroding democracy.
"What we're seeing is this small group of elite in places like the World Economic Forum in Davos this week having the extraordinary ability to be able to get in the ear of politicians and look at tax laws that benefit them and their shareholders - but not anything else," Ms Le Mesurier said.
"Tax is one piece that New Zealanders can look at right now - what can taxes do in New Zealand to make it fairer?
"It's not fair that a small proportion can avoid paying taxes and most importantly how to help that 30 per cent of the poorest part of the population to get a bigger share of the wealth growth?"
Ms Le Mesurier said Oxfam is "not about being anti-rich - it is actually about being anti-poverty".
"This extreme gap is not good - it's not good for the world and it's not good for New Zealand.
"Inequality is not inevitable ... governments do have choices.
"If we don't do something about this expanding gap between the very poor and the very rich, those successes [of] lifting people out of poverty are going to stall and perhaps even go backwards."
The Government has committed to a Tax Working Group chaired by Sir Michael Cullen, with an interim report due this year and final recommendations by early 2019.
The working group will consider a capital gains or land tax, but not on the family home, a progressive company tax system and a tax system that delivers positive environmental outcomes - though not specifically a carbon tax.
The group will include Finance Minister Grant Robertson and Revenue Minister Stuart Nash.
Mr Robertson last year said "the Tax Working Group has been established to look at the structure, fairness and balance of New Zealand’s tax system".
"The wide range of expertise and experience among the membership means the Working Group is well placed to consider changes to make our tax system fairer," he said.
The working group's other members are from a diverse range of business backgrounds.
TAX WORKING GROUP MEMBERS
Professor Craig Elliffe, University of Auckland
Joanne Hodge, former tax partner at Bell Gully
Kirk Hope, Chief Executive of Business New Zealand
Nick Malarao, senior partner at Meredith Connell
Geof Nightingale, partner at PwC New Zealand
Robin Oliver, former Deputy Commissioner at Inland Revenue
Hinerangi Raumati, Chair of Parininihi ki Waitotara Inc
Michelle Redington, Head of Group Taxation and Insurance at Air New Zealand
Bill Rosenberg, Economist and Director of Policy at the CTU
Marjan Van Den Belt, Assistant Vice Chancellor (Sustainability) at Victoria University of Wellington