Inland Revenue will investigate New Zealand links to off-shore tax havens after receiving information from the International Consortium of Journalists.
Investigative journalist Nick Hager is part of the group, which says it has more than 2.5 million files on suspected tax dodgers, including a company founded by a New Zealander in the Cook Islands.
Mr Hager said the Cook Islands is one of 60 countries that are tax havens.
He told Morning Report that while it would be hard for New Zealand to convict people, the Government needs to shut down the practice.
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Revenue Minister Peter Dunne said Inland Revenue will investigate any allegations relating to tax avoidance.