The four-year tax exemption almost every returning Kiwi gets wrong

If you've been out of New Zealand for ten years or more and you're moving back, or you're a new migrant arriving for the first time, IRD gives you four years where most of your overseas income isn't taxed here. Interest, dividends, foreign investment fund income, rent - exempt, automatically. Foreign employment or personal services income isn't covered. Neither is anything you'd already agreed to pay New Zealand tax on before the exemption started.

You qualify if you weren't a New Zealand tax resident at any point in the ten years before you became one again, and you first qualified as resident on or after 1 April 2006. You get it once. Use it during your first stint back and it's gone - a second return trip twenty years later, with a different pot of overseas savings, doesn't get a second exemption.

Residency itself is triggered by whichever comes first: more than 183 days in New Zealand in any 12-month period, backdated to day one of that window, or a permanent place of abode here - broadly, somewhere you call home, even when you're not in it. There's a separate carve-out since April 2026 for people on short stints, up to 275 days over 18 months, who aren't working for a New Zealand employer and aren't claiming Working for Families. That group doesn't trigger residency at all. Most people reading this aren't in that group.

The part that catches people out

If you qualify through the 183-day test, your exemption start date gets backdated to day one of that 183-day window - before you'd have had any idea you were about to become tax resident. The end date doesn't get the same treatment. It's four years after the end of the month you actually crossed 183 days, calculated from the real day, not the backdated one.

Work through what that means and the exemption you actually get can run longer than four years measured from the date IRD says it started. If you qualify through the permanent place of abode test instead, start and end are both keyed to the same date, so there's no gap.

IRD's own guidance calls the date calculation complex enough to warrant a tax professional. That's not a throwaway line here - get the actual dates confirmed rather than assuming four years means four years from the day you got off the plane.

Foreign superannuation runs on the same clock

Bringing a pension with you - a UK pension, a US 401(k), anything in that category - gets a matching four-year window, calculated the same way as above. Withdraw or transfer it inside the window and it's untaxed.

Miss the window and you're taxed on it, using either the schedule method (the default - a set percentage of the lump sum based on how long you've been a New Zealand tax resident) or the formula method (taxed on the actual gain, complex enough that IRD itself recommends professional advice to use it).

Australian superannuation sits outside all of this. Lump sum withdrawals and transfers from an Australian scheme aren't taxed here at all, exemption window or not, under the trans-Tasman portability arrangement. And if your KiwiSaver provider offers the "scheme pays" option on a taxable transfer, they can settle the 28% tax directly out of the transferred funds instead of you finding the cash separately.

What ends it early

A few things end the exemption before the four years are up: applying for Working for Families, including Best Start, while you're still inside the window. Voluntarily declaring exempt income on your return. Telling a foreign tax authority and IRD you'll pay New Zealand tax on it from a set date. Or just telling IRD directly you don't want to be a transitional resident.

The Working for Families one is the trap. It's easy to not connect a family tax credit application to your overseas investment income exemption, because on the surface the two look like they have nothing to do with each other.

The day after your exemption ends, ordinary tax residency rules apply to everything - worldwide income, including FIF on whatever foreign portfolio you're still holding at that point. What counts as your opening value for FIF purposes from that day is its own question, and probably a separate issue.