The IRD has set up a team to sift through documents about foreign-owned trusts from the Panama Papers.
A cache of material from the leak of documents from the Panamanian law firm Mossack Fonseca is due to be released. Prime Minister John Key said the information could lead to law changes.
"It is quite useful that the Panama Papers get released," Mr Key said, "if that helps assist the New Zealand Government in making improvements to any of the laws that we have, or the partners that we work with like the OECD."
He said he did not condone the hacking of private information, but now that information would be released "there might be some benefits to gain from that".
Any New Zealanders found to be avoiding tax could expect a "knock at the door", he said, and if there was evidence of trusts being used improperly by foreigners the rules could be tightened.