A crackdown on New Zealand's richest people by the Inland Revenue Department is expected to net $500 million over a 10-year period.
The probe is targeting 250 people who control more than $50m each. They collectively have 7500 companies and trusts, which can be used to avoid tax. One individual had 197 entities, the Weekend Herald reported.
The IRD would not say how much extra tax it collected in the current year but the total collected over 10 years is expected to be more than $500m.
Cases still under investigation total $158m, and a further $130m is disputed.
The IRD is also targeting people involved in online auctions and garage sales who are not disclosing income and people using family trusts to avoid tax.
The relatively small amount of tax paid by very wealthy individuals has been highlighted as an issue by politicians in the past.
The IRD says the integrity of the tax system relies on people being assured that everyone pays their fair share.
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