More than 1800 foreign trusts have told Inland Revenue they don't want to register under new rules that require them to reveal financial information and their ultimate owners.
New Zealand's foreign trust industry came under the spotlight last year in the wake of the Panama Papers - a cache of 11.5 million documents leaked from Panamanian law firm Mossack Fonseca.
This document trove, according to the group of journalists that analysed it, allegedly showed New Zealand was being used as a tax haven and raised questions over whether this country's foreign trust industry was open to abuse.
The tax haven contention was rejected by former PwC partner John Shewan, who was commissioned to review trust disclosure laws.
Shewan said in his subsequent report that New Zealand was not a tax haven but that the disclosure rules for foreign trusts were "not fit for purpose"and "light-handed".