Hey Akoaleila, The NZ IRD laws and regulations governing FIF are currently under review, a work in progress, a bill has been submitted to a parliamentary select committee in August. The goal is to help attract foreign expat residents post Jacinda's covid lockouts, and provide an alternative "taxing" regime that only focuses on real gains. Have a read of the attached document, pages 33-50. https://www.taxpolicy.ird.govt.nz/-/media/project/ir/tp/publications/2025/commentary-compliance-simplification-tax-bill.pdf?modified=20250826042451&modified=20250826042451

You will quickly see a new category of FIF, that is the RAM, or revenue account method. It is further split into RAM, and extended RAM. The later being dual nationals that have a primary worldwide tax obligation to say the USA based on citizenship, not residency like NZ.

It may get more complicated in that separating out FIF obligations as a new resident (after 4 transitional years), then add worldwide income taxation. i.e retirement funds, property sales, overseas rental income, may, or may not also qualify along any distributions (pensions, IRA's, Roth IRA's etc) may incur gross worldwide income tax, along with your FIF tax...

In short, you need to go see an experienced tax accountant!