What changes when you move from the United States to New Zealand?

Can you just go?

No. The United States is a visa waiver country for a visit, but Immigration New Zealand is clear that "If you want to work or live in New Zealand, you need to get a work or resident visa." Which one fits is a question for Immigration New Zealand, and this guide does not try to answer it.

It does matter here, though, because nearly everything below depends on which of the two you hold. A work visa and a resident visa open very different doors.

1Before you leave the United StatesYour US tax return keeps coming, wherever you liveYour state may still count you as resident

2Arriving on a work visaPublic health care, on a visa of 2 years or moreNo KiwiSaver, and no buying a home, on a work visa

3Once you hold a resident visaKiwiSaver opens to youA home, once you've lived there 12 months

4About four years after arrivingThe four-year break on income from abroad ends

Before you leave the United States

The US tax return does not stay behind. The IRS taxes its citizens on worldwide income wherever they live: "You are subject to tax on worldwide income from all sources and must report all taxable income and pay taxes according to the Internal Revenue Code." Leaving moves the deadline, adds the FBAR once your New Zealand accounts pass $10,000, and in most cases leaves nothing owing. What you still file from New Zealand has a guide of its own.

Your state may not let you go either. Federal tax is one question and state tax another. California, as an example, counts as a resident anyone "Domiciled in California, but outside California for a temporary or transitory purpose". Check what your own state needs to see before it treats you as gone.

Your 401(k) and IRA can stay. They are not moved into KiwiSaver without first coming out, taxed, in the US, and New Zealand taxes them in its own way, which is where the four-year window below matters most.

Your first year in New Zealand

Tax: resident within about six months, with a four-year window. You become a New Zealand tax resident after "more than 183 days in any 12-month period", or sooner once you have a place you usually live. A new arrival who was "not a tax resident at any time in the 10 years before" is then a transitional resident, and "Transitional tax residents can be temporarily exempt from paying tax on most types of overseas income" for about 4 years. That "includes overseas interest, dividends, foreign investment fund income, rent", but not wages: "Income you earn overseas from employment or providing personal services is not exempt."

US Social Security sits outside all this. Inland Revenue: "A social security pension from the United States isn't taxable in New Zealand".

Health care, if your visa is long enough. A work visa holder is eligible for public health care if the visa lets you stay "for 2 years or more". There is no reciprocal agreement with the United States: Health New Zealand lists agreements with Australia and the United Kingdom only, so a shorter visa means insurance.

No KiwiSaver on a work visa. Inland Revenue: "You cannot join KiwiSaver if you have a temporary, visitor, work or student visa." With a resident visa you can, and a new job enrols you automatically. Before you do, read how the United States treats KiwiSaver, because it is one of the least settled questions in either tax system.

No home on a work visa. Land Information New Zealand lists "an overseas person with a temporary, limited, interim or transit visa (such as a student, work or visitor visa)" among those who cannot buy residential land. A resident visa holder can buy without consent once ordinarily resident, which means having lived in New Zealand for the past 12 months and been in New Zealand for more than 183 days of them.

Your licence. The United States is one of New Zealand's exempt countries, so converting needs no theory test, and a practical test only if you have held your licence for under 2 years. You can drive on your US licence for 18 months from arrival, falling to 12 months from 1 November 2026.

Benefits wait two years

For the main benefits, "a person must have lived continuously in New Zealand for 2 or more years at any one time since becoming a New Zealand citizen or residence class visa holder." The clock starts with your resident visa, not with your arrival.

Children born in New Zealand

A child born abroad to an American can be a US citizen from birth, recorded by a Consular Report of Birth Abroad, which the State Department describes as "a formal document certifying the acquisition of U.S. citizenship at birth". Where the other parent is not a US citizen, the US parent needs to have lived in the United States for "not less than five years, at least two of which were after attaining the age of fourteen years".

That citizenship comes with the rest of this guide attached. A US citizen child grows up into the same worldwide tax return.

Retiring in New Zealand

New Zealand Superannuation needs between 10 and 20 years of living in New Zealand since you turned 20, depending on when you were born, and 5 of them since 50.

The two countries have no social security agreement, and it shows twice. Your US years do not count towards NZ Super, and US Social Security is deducted from NZ Super dollar for dollar. On the other side, a US citizen is paid Social Security in New Zealand for life.

What gets easier, and what gets harder

Easier

• Health: public care once your visa runs 2 years or more.
• Tax: about four years in which most income from abroad is not taxed in New Zealand.
• Social Security: not taxed in New Zealand, and paid to a US citizen there for life.
• Driving: a US licence converts without a theory test.

Harder

• The US tax return, and the FBAR, keep coming.
• KiwiSaver and New Zealand funds sit awkwardly in US tax.
• No KiwiSaver, and no buying a home, until you hold a resident visa.
• No social security agreement: Social Security comes off NZ Super, dollar for dollar.
• Main benefits wait 2 years after you become a resident.

What this guide does not tell you

It does not tell you which visa to apply for, or how long a work visa takes to become a resident one: that is Immigration New Zealand's to answer. It does not work out what you owe either government, or how the tax treaty between them applies to your income.

And it does not cover giving up US citizenship, which changes the tax picture entirely and has rules of its own that are best taken to someone who does that work.