How Does FIF Tax Work on Overseas Shares in NZ?

If you've bought Apple, Tesla, or a Vanguard ETF through Sharesies or Hatch, New Zealand's tax rules treat that investment very differently to a share in Auckland Airport or Fisher & Paykel Healthcare. The regime is called Foreign Investment Fund (FIF) tax, and it catches far more everyday investors than the name suggests.

This guide covers when FIF tax applies, how to actually calculate it, the platform-specific quirks that catch Sharesies and Hatch investors out, and a completely separate risk with nothing to do with FIF: US estate tax on American shares.

One thing to flag before you read on: NZ's tax treatment of overseas investment is genuinely in flux right now. Budget 2026 proposed the biggest change to FIF tax since the rules began, and as of this writing it still isn't law. The exact numbers below are correct as of publication, but tax rules change, so cross-check the current thresholds on ird.govt.nz before you rely on them for your own return.

This is general information, not personalised financial or tax advice. It doesn't account for your individual circumstances, so talk to a tax professional or check IRD directly before making decisions based on any of it.

What counts as a FIF, and what doesn't?

A FIF is broadly any interest in a foreign entity that isn't specifically excluded. In practice, most overseas shares and ETFs Kiwi investors buy fall into it:

These are FIFs: shares listed on foreign markets (US, UK, Japan, Hong Kong and so on), ETFs listed on those markets, most Australian unit trusts (like Vanguard's Australian-domiciled funds available through InvestNow), and most ASX-listed companies.

These aren't FIFs: shares listed on the NZX, NZ-domiciled funds and ETFs that invest overseas (Smartshares' and Kernel's international funds, for example), ASX-listed companies that qualify for the FIF exemption (IRD has a lookup tool for this), KiwiSaver funds, and other assets like foreign bank deposits, bonds, or cryptocurrency held directly.

Do you actually need to worry about FIF tax?

It comes down to cost, not market value. Add up what you originally paid (in NZD) for every FIF you hold, across every platform. If that total cost stayed under $50,000 NZD for the entire tax year (1 April to 31 March), you're exempt from the FIF rules and use the simplest calculation, the de minimis method.

If your FIF cost went above $50,000 at any point during the year, even for a single day, you have to use one of the more involved methods (Fair Dividend Rate or Comparative Value) for your whole FIF portfolio. You can pick whichever of the two gives you the lower taxable income, but you can't mix methods across different holdings.

One catch worth knowing: if you voluntarily choose to use FDR or CV while under the $50,000 threshold, you're locked into using one of those methods for the next four tax years.

This threshold is about to change, but hasn't yet. As part of Budget 2026, Revenue Minister Simon Watts announced a proposal to raise the FIF de minimis threshold from $50,000 to $100,000 NZD, broadly restoring its original value after accounting for inflation since it was set in 2000. If it becomes law, it's expected to apply from the 2026–27 tax year. But it's still just a proposal: the change is expected to appear in a separate tax bill around September 2026, and until Parliament actually passes it, the $50,000 threshold is what applies (source: Beehive.govt.nz, 28 May 2026).

How do you calculate FIF tax?

There are three main methods, and which ones are available to you depends on the threshold above.

Method 1: De minimis exemption. This taxes you on the dividends you actually received, converted to NZD. If your total income that hasn't already been reported to IRD is less than $200 for the year, you generally don't need to file an IR3 solely because of that income.

Example: Dave made $50 NZD in dividends from Apple shares and has no other unreported income. Assuming he has no other reason to file an IR3, that amount alone would generally not require him to file one. Vanesa made $300 NZD in dividends from a Vanguard S&P 500 ETF, so her FIF taxable income is $300.

The upside of this method is that capital gains generally aren't taxed under it, which matters if you hold growth shares that pay little or no dividend. The downside is it works badly for a dividend-heavy portfolio, and you may still owe capital gains tax separately if you originally bought shares intending to sell them for a short-term profit.

Method 2: Fair Dividend Rate (FDR). This assumes you earned a flat 5% return, regardless of what actually happened. Take the market value of your FIFs in NZD at 1 April (the start of the tax year) and multiply by 5%.

Example: the market value of Dave's FIFs was $82,500 at the start of the year. Under FDR, his taxable income is $82,500 × 5% = $4,125, whether his shares actually went up 40% or fell 10%. If you buy and sell the same holding within the year, a "quick sale adjustment" applies on top, which is where FDR gets genuinely complicated.

FDR's advantage is that new money you contribute during the year is effectively untaxed, since the calculation is based on your opening balance. Its disadvantage is the reverse: FIFs you sold during the year still get taxed as if you held them all year, and if your actual return was under 5%, you're overpaying relative to what you made.

Method 3: Comparative Value (CV). This taxes your actual increase in value: closing value (plus dividends and sale proceeds) minus opening value (plus the cost of anything you bought during the year). If the result is negative, your FIF taxable income for the year is $0, but you can't use that loss to offset other income.

Example: Dave's opening value plus new contributions came to $102,500. His closing value plus $50 in dividends came to $110,050. His CV taxable income is $110,050 − $102,500 = $7,550.

CV is the most complex of the three to calculate, but it's the only one that reflects a genuinely low or negative return year. Its drawback is that it taxes unrealised gains, so in a strong year you can end up paying tax on paper profits you haven't banked yet.

A couple of rarer methods, Deemed Rate of Return and the Cost Method, exist for specific situations but are uncommon. IRD's FIF calculator, your platform's own tax reports, and portfolio trackers like Sharesight can all help with the arithmetic, but for a portfolio of any size, an accountant is worth it.

How much tax will you actually pay, and how do you file it?

Whatever your FIF taxable income works out to, it's taxed at your ordinary marginal rate, alongside your salary and other income. The current NZ income tax brackets are:

You declare FIF income in the Overseas Income (17B) field on your IR3 individual tax return, generally due by 7 July each year (later if you file through a tax agent). IRD calculates the actual dollar amount owed for you once you file.

Any foreign withholding tax you've already paid, such as the 15% the US withholds on dividends under the NZ–US tax treaty, goes in the Total Overseas Tax Paid (17A) field, and can usually be claimed as a foreign tax credit against your NZ bill. FIF disclosure forms are only needed in the rare case where you use FDR or CV and hold an interest in a company incorporated in a country NZ has no tax treaty with.

What platform-specific quirks should Sharesies and Hatch investors watch for?

Sharesies automatically withholds tax from your overseas dividends on the assumption you're a de minimis investor on the top 33% rate. If that assumption happens to match your actual tax rate, this is convenient. If it doesn't, you'll simply be squared up when IRD processes your return. Sharesies also withholds this even on small amounts that would otherwise fall under the $200 de minimis threshold, and it withholds upfront rather than at year-end, meaning less of your money is available to reinvest in the meantime. If your FIF cost is over $50,000, you can now formally opt out of this automatic withholding through Settings > Tax details, which hands full control of the timing back to you (Sharesies still separately withholds and pays any foreign tax owed to the US or Australian tax authorities regardless).

Hatch used to sweep uninvested USD cash into DAGXX, a money-market fund that itself counted as a FIF. That meant investors with a share cost well under $50,000 could still get pulled into FDR/CV territory once their cash balance, including proceeds sitting in your account right after a sale, was counted. That's since changed: from 15 January 2026, Hatch moved uninvested cash out of DAGXX into US bank deposit accounts administered by DriveWealth, and Hatch's help centre confirms uninvested balances no longer count toward the $50,000 FIF threshold. The trade-off is that this cash no longer earns any dividend or interest, and Hatch notes that holding foreign currency cash can trigger separate financial arrangements tax rules, so it isn't a complete escape from complexity.

Australian Unit Trusts (funds like Vanguard's Australia-domiciled international funds) are required to pay out realised capital gains as dividends. Under the de minimis method, that effectively taxes gains that would otherwise be tax-free in a normal FIF, an important difference from a typical listed share.

Cash and bond ETFs get taxed the same flat 5% under FDR as equity ETFs would, even though bonds and cash typically return less than that. If your FIF portfolio includes fixed-income exposure, this can materially affect the relative outcome of FDR and CV.

Can you avoid FIF tax by using NZ-domiciled funds instead?

Not entirely. Funds like Smartshares' Total World ETF or Kernel's Global 100 Fund aren't FIFs from your point of view, since they're NZ-domiciled. But the fund itself holds FIFs underneath, and pays FIF tax on them, which flows through into your unit price. This is sometimes called indirect FIF tax, and you end up wearing it either way.

NZ-domiciled funds are required to use the FDR method for their own FIF calculations, with no option to switch to CV in a flat or down year. That's a real disadvantage in years when direct investors using CV would pay less. It's offset somewhat by these funds' PIE tax rate being capped at 28%, useful if your marginal rate is 30%, 33% or 39%, and by not having to do the FIF paperwork yourself.

Whether these trade-offs are reason enough to change how you invest is a personal call that depends on your own goals and risk tolerance, not something a general guide like this can tell you. Geographic and sector diversification benefits from investing overseas are commonly cited as a reason investors accept the extra tax cost and complexity; whether that trade-off suits you is worth discussing with a professional rather than deciding from an article.

Could US estate tax apply to your US shares?

This one has nothing to do with FIF tax, and it catches a lot of people by surprise. The US imposes an estate tax on the US-situs assets of non-resident, non-citizen investors, including New Zealanders, at rates up to 40%.

The exemption for a non-resident, non-citizen individual is just $60,000 USD (roughly $88,000–100,000 NZD depending on the exchange rate) worth of US assets. Compare that to the exemption available to US citizens and domiciliaries, which sits above $15 million per person in 2026: the gap exists because the US–NZ tax treaty doesn't cover estate tax at all.

The structure through which US investments are held can affect US estate-tax exposure. For example, direct ownership of US shares can be treated differently from holding exposure through an NZ-domiciled fund. If your direct US holdings are approaching the US$60,000 threshold, this is something worth discussing with a qualified tax or estate-planning professional.

What is the withholding tax on US partnership investments?

Since 1 January 2023, US tax rules have applied a 10% withholding tax to non-US investors selling units in a US publicly traded partnership (PTP). It's been standard practice on the relevant investments for years now, not an upcoming change.

Ordinary shares and index ETFs aren't affected: Apple, Microsoft, and an S&P 500 fund all sit outside this rule. It applies specifically to a smaller category of investments structured as partnerships, mostly certain commodity and energy funds (the United States Oil Fund is a commonly cited example). Sell $1,000 USD worth of units in an affected fund, and $100 USD gets withheld regardless of whether you made a profit or loss on the trade.

Brokers and platforms typically publish a list of which specific investments this applies to. It's worth a quick check before buying anything you're not sure is a plain share or ETF.

So how much should FIF tax actually change how you invest overseas?

FIF tax is a genuine cost of investing outside New Zealand, both in the tax itself and in the effort of calculating it. Layer in the potential exposure to US estate tax on direct US holdings, and international investing here comes with more friction than buying NZ shares does.

But the rules are also being actively loosened, not tightened: the proposed jump to a $100,000 threshold would take a large share of everyday investors out of FDR/CV altogether. Whatever the settings end up being when you file, check them fresh against IRD's own guidance for that specific tax year rather than relying on last year's numbers, or this article's.

Frequently Asked Questions

Does FIF tax apply to my KiwiSaver?

No. KiwiSaver funds are specifically excluded from the FIF rules, regardless of how much of the underlying fund is invested overseas.

I only crossed the $50,000 FIF threshold for a few weeks mid-year. Does that still count?

Yes. The test is whether your FIF cost exceeded the threshold at any point during the tax year, even briefly, not just at year-end. Crossing it for a single day is enough to require the FDR or CV method for that whole tax year.

My FIF calculation came out as a loss this year. Do I get a refund?

No. Under the Comparative Value method, a loss simply means your FIF taxable income for the year is $0. It can't be used to offset other income, and it doesn't carry forward to future years.