The FIF Rules: A Plain English Guide to Taxing Overseas Investments in NZ

New Zealand taxes overseas investments differently from almost everything else in your portfolio. The rules have a name: the Foreign Investment Fund regime (FIF). The FIF rules include a threshold most investors hit without noticing, but IRD knows when you cross it.

Through automatic information-sharing agreements with dozens of countries, they receive reports from overseas custodians and cross-reference them against filed returns. The question is not whether to understand FIF. It is whether you do so before or after a letter arrives.

The FIF regime is widely misunderstood, rarely explained in language anyone other than accountants can unpack, and catches considerably more investors than it used to. The key threshold has not moved since the year 2000, though changes announced on 28 May 2026 would double it from the start of the current 2026/27 tax year, subject to legislation.

Here, we will explore what FIF is, when it applies, how to calculate what you owe, why investment structure matters more than most investors realise, and what to do about it practically.

What FIF Is and Why It Exists

New Zealand does not have a general capital gains tax. Without a specific regime for overseas investments, a New Zealand resident could hold a globally diversified portfolio for decades, watch it compound, and pay tax only on the occasional dividend. The underlying gain would accumulate entirely untaxed until sale, if a sale ever came.

The FIF regime closes that gap.

FIF is the mechanism New Zealand uses to tax ongoing accumulation in overseas investments, regardless of whether gains are realised or income is distributed. If you hold overseas shares above a certain threshold, you owe tax each year on a deemed or actual measure of income from those holdings, regardless of whether or not you received a cent.

If you are in need of some light bedtime reading, IRD's FIF guidance and IR461 guide is the authoritative source.

When FIF Applies: The Cost-Basis Threshold

The FIF regime applies to New Zealand tax residents who hold overseas shares, overseas ETFs, or interests in overseas unit trusts with a combined cost basis exceeding the de minimis threshold. The threshold has been NZ$50,000 since 2000. The Government's 2026 Budget, delivered on 28 May 2026, proposes raising it to NZ$100,000 effective from 1 April 2026 (the start of the current 2026/27 tax year). The change is not yet legislated and remains subject to the parliamentary process. Investors below the threshold can ignore the FIF rules entirely. Dividends remain taxable when received.

Cost basis is critical. The threshold is based on what you originally paid for the investments in NZD, including brokerage fees at the time of purchase. It is not based on current market value.

• A portfolio purchased for $48,000 that has since grown to $80,000 sits below the threshold.
• A portfolio purchased for $55,000 that has since fallen to $42,000 sits above it.

The same cost-basis principle would apply at the proposed $100,000 threshold. Many investors track only their current portfolio value and miss this distinction entirely.

Several further details matter in practice:

1. The threshold is breached if your cost basis exceeds the de minimis figure on any single day during the tax year running from 1 April to 31 March, the New Zealand financial year. Cross it in August, fall back below by March, and FIF applies to the whole year.
2. When the threshold is crossed, FIF applies to the entire overseas portfolio, not just the portion above it.
3. Each individual has their own threshold. For couples holding investments in their own names separately, the effective household exemption is double the single figure: $100,000 currently, or $200,000 under the proposed change.
4. For trusts and companies, the de minimis threshold does not apply at all. FIF applies from the first dollar. (Certain family trusts may still qualify for the de minimis exemption. Check with your accountant or tax adviser.)
5. New Zealand-domiciled Portfolio Investment Entity ("PIE funds") holdings are excluded from the personal FIF threshold entirely. This includes funds issued by providers such as Kernel or Simplicity, though double-check with the provider to be sure. Typically, in these PIE funds, the fund manager handles FIF at the fund level on your behalf.
6. Below the threshold, the position is straightforward. Only actual dividends received are taxable. Unrealised capital gains are not. For someone building a portfolio gradually through an investment platform like Sharesies or Hatch, this is a meaningful advantage while it lasts.

One notable exemption applies to Australian shares. Individual shares listed on the Australian All Ordinaries index are generally exempt from FIF, provided the company maintains a franking account. This means a New Zealand investor holding shares in, say, BHP or Commonwealth Bank directly is not subject to FDR or CV on those holdings, and they do not count toward the FIF cost threshold. Dividends are still taxable when received. However, New Zealand investors cannot claim Australian franking credits, which means there is an element of double taxation on the dividend income. The exemption applies to individual Australian shares meeting the criteria, not to Australian Unit Trusts or Australian ETFs, which have their own (more complex) tax treatment.

As noted earlier, the $50,000 threshold has not changed since 2000. Twenty-five years of asset price growth means far more ordinary investors are now caught by rules originally designed for wealthier households. The proposed change would double the threshold to $100,000 effective from 1 April 2026, broadly restoring the real value of the de minimis exemption set in 2000. The proposal has been announced but is not yet legislated.

For the avoidance of doubt, the threshold is based on the cost basis in NZD. Currency fluctuations on the day of purchase matter. If someone bought US shares when the NZD was strong, their cost basis is lower than if they bought the same amount when the NZD was weak.

Tax regulations change frequently and the taxation of international investments can be horribly complex. Here at Become Wealth we're not accountants or tax advisers. Proceed carefully before taking any tax-based actions (or not taking them!) and be sure to seek professional tax advice first.

The Two Calculation Methods: FDR and CV

Once above the threshold, five FIF calculation methods exist under New Zealand law. For the overwhelming majority of retail investors, two are relevant: the Fair Dividend Rate (FDR) method and the Comparative Value (CV) method. The other methods, including the deemed rate of return and cost method, apply in narrow circumstances and are generally a matter for specialist tax advice.

Two rules apply across both methods and must be understood before choosing one:

1. The same method must be applied to the entire overseas portfolio in a given year. You cannot use FDR for one holding (such as a Vanguard S&P 500 ETF) and CV for another (such as shares in Apple).
2. Investors can switch between FDR and CV from year to year and are generally permitted to calculate both and use whichever produces the lower taxable income for that year. The minimum taxable income under either method is zero. You cannot generate a FIF loss to offset against other income, such as salary, though a CV loss can reduce future FIF income from the same portfolio.

The Fair Dividend Rate (FDR) method deems 5% of the opening market value of your overseas portfolio to be taxable income for that year. This applies regardless of whether dividends were received and regardless of whether the portfolio rose or fell in value. In a year the portfolio drops 15%, the FDR investor still pays tax on 5% of the opening value. The tax is on a deemed figure, not real income.

The Comparative Value (CV) method taxes the actual change in total portfolio value during the year. The formula is: closing market value plus dividends received, minus opening market value. If the portfolio fell in value and paid no dividends, taxable FIF income under CV is zero.

The method election matters more than most investors realise. Here is a concrete example.

An investor holds $60,000 in a US-listed ETF purchased directly through a New Zealand brokerage. During the year the portfolio falls 8%. No dividends are paid.

Under FDR: taxable income is 5% of $60,000 = $3,000. At a 39% marginal tax rate, the investor pays $1,170 on a portfolio that declined in value.

Under CV: the portfolio fell. Taxable income is zero. Tax owed is nil.

Same year, same investor, $1,170 difference. The method election is not a formality.

Now reverse the scenario. The same $60,000 portfolio returns 18% and pays no dividends.

Under FDR: taxable income is $3,000. Tax at 39% is $1,170.

Under CV: taxable income is $10,800 (18% of $60,000). Tax at 39% is $4,212.

In a strong year, FDR wins by a wide margin. In a down year, CV wins entirely. This is why the ability to switch annually is genuinely valuable.

Short Sales, Derivatives, and Synthetic Exposure

The FDR and CV methods described above assume conventional long positions in overseas shares or ETFs. Where short sales, options, or other derivative exposure exists, FIF treatment diverges materially.

Short positions are generally treated as financial arrangements rather than attributing interests, which means they fall outside the standard FDR and CV framework and may generate taxable income on a different basis entirely. Gains on short positions can crystallise for tax purposes before the position is closed. The interaction between FIF and financial arrangement rules is genuinely complex, and the tax outcome depends on the specific instrument, the timing of the position, and how the exposure was constructed.

If any part of your overseas portfolio involves short selling, options, contracts for difference (CFDs), or structured products, do not attempt to self-assess. Engage a tax adviser with specific experience in international investment taxation.

How Investment Structure Changes the Tax Outcome

This is where the real money lives. Same underlying investment, materially different tax outcomes depending on how it is held.

Holding overseas ETFs directly above the cost threshold means FIF applies at the personal level. Tax is paid at your marginal rate up to 39%, a CV election is available annually across the whole portfolio, and foreign tax credits for withholding taxes paid overseas can generally be claimed against New Zealand tax owed. The flexibility is genuine. An IR3 return is required each year, which is simply achieved online, and you remain responsible for tracking your cost basis and calculating FIF income.

One less obvious risk is worth understanding. US-listed ETFs and US shares held directly in a personal name by a non-US resident attract a 40% US estate tax on the value of those assets above USD$60,000 on death. New Zealand residents holding a reasonably sized US share portfolio directly are well within range. Holding equivalent assets through a New Zealand-domiciled PIE fund removes this exposure entirely, because the fund rather than the individual holds the underlying US assets.

A New Zealand PIE fund handles the tax position differently. Tax is attributed at your Prescribed Investor Rate, capped at 28%, with no IR3 return required and no US estate tax exposure. The fund holds the underlying assets and handles all FIF calculations. A PIE fund does not protect investors from paying tax in a down year. FDR is applied at the fund level regardless of actual returns. The rate saving over a direct holding taxed at 39% can be real and compounds meaningfully over time.

Direct vs PIE: What It Actually Comes Down To

The headline rate differential is 11 percentage points, but as with all things tax, it is not so easy to unpack. Let's compare:

• Direct holdings at the highest tax rate of 39%, using FDR only: Annual tax drag is 1.95% of the portfolio's opening market value (5% deemed return × 39%). This is the theoretical maximum for a direct investor who never switches method, and it applies every year regardless of actual performance.
• Direct holdings at the highest tax rate of 39%, with optimal annual switching: A direct investor can elect the CV method in any year where it produces a lower result. Over the past 30 years, roughly 30% of years delivered total returns below 5% in NZD terms, making CV the better option. In years where the portfolio declines, CV tax is zero. In years where returns are positive but below 5%, CV tax is the actual return multiplied by 39%, still lower than the FDR amount. Assuming FDR applies in 70% of years and CV produces zero or near-zero tax in the remaining 30%, the blended long-run average falls to somewhere between 1.40% and 1.50%. The exact figure depends on the return sequence and the split between genuinely negative years and merely low positive ones.
• PIE fund at 28%: Annual tax drag is 1.40% (5% × 28%), and this applies every year with no CV option available. The rate is fixed regardless of market performance. There is no relief in a down year, but equally no compliance required and no annual method decision to make.

The trade-off: The difference in long-run tax drag between a well-managed direct portfolio and a PIE is narrower than the headline rates suggest. A disciplined investor switching methods annually may roughly match the PIE's 1.40% over a full market cycle. But tax drag is only one input. Fund cost, liquidity, access to specific markets and managers, US estate tax exposure, and compliance burden all factor into which structure (or combination of structures) delivers the best after-tax, after-cost outcome. In practice, many well-constructed portfolios use a blend of PIE and non-PIE vehicles, each chosen for a specific reason. Getting the mix right is where good advice earns its keep.

A word of caution. Tax efficiency matters, but it should inform investment decisions, never dictate them. The right investment in a slightly less tax-efficient structure will almost always outperform the wrong investment in a perfectly optimised one. Asset allocation, diversification, investment quality, fees, and perhaps most importantly your behaviour all have a larger bearing on long-term outcomes than tax drag alone. Structure is worth getting right, but only after the investment fundamentals are sound.

The Revenue Account Method: A Realisation-Based Alternative

The Revenue Account Method (RAM) is a FIF calculation method allowing eligible investors to pay tax on realised gains rather than on deemed income. Tax is owed when the investment is sold, not annually. Under RAM, 70% of the capital gain on sale is taxed at the investor's marginal rate (equivalent to a 30% discount on the gain). For a 39% taxpayer, the effective tax on gains is 27.3%. Dividends remain fully taxable when received.

RAM was enacted into law in March 2026, with effect from the 2025/26 tax year (1 April 2025). At that point, eligibility was restricted to:

• Migrants who became fully New Zealand tax resident on or after 1 April 2024, and
• Returning New Zealanders who had been non-resident for at least five years.

The Government's 2026 Budget proposes a substantial expansion of RAM eligibility from the 2026/27 tax year (1 April 2026), subject to legislation:

• RAM would extend to all New Zealand tax residents for their unlisted foreign shares. The expansion is expected to be limited to natural persons and family trusts.
• An extended version of RAM would become available to any New Zealand resident facing concurrent taxation in another country due to citizenship or right-to-work status. This primarily covers US citizens, Green Card holders, and dual nationals whose foreign tax obligations would otherwise overlap with the FIF regime. Extended RAM covers both listed and unlisted foreign shares.

For investors with concentrated overseas holdings, particularly unlisted shares or start-up equity where annual cash flow to fund FDR liabilities is unrealistic, RAM is materially more workable than FDR. If you may qualify for RAM or extended RAM, professional tax advice ahead of your next filing will likely pay for itself many times over.

The same Budget announcement also proposes preserving the attributable FIF income (AFI) method for founders and active investors whose stake in a growing business dilutes below 10%, and extending the 10-year corporate-migration FIF exemption to cover overseas listings via special purpose acquisition companies. These are narrower changes affecting founders and early-stage investors, not retail portfolios.

Calculating Your FIF Obligations: Three Practical Options

The calculation of FIF is the hard part; the payment is the easy part, so long as you have the right tools. There are several choices:

FIF calculated through your investment platform

If you invest through a world-class institutional platform such as FNZ, which Become Wealth recommends for many client portfolios, FIF calculations are handled entirely on your behalf. The platform calculates attributed income, then provides the FDR and CV figures. So, you basically receive a tax certificate rather than a calculation problem. For investors whose portfolios are managed this way, FIF compliance is nearly invisible. This is one of the substantive advantages of working with a professionally managed discretionary service rather than a self-directed brokerage account.

To learn more, book a complimentary initial consultation with our investment team.

FIF calculated through a portfolio tracking application

If you manage direct holdings yourself, online tools such as Sharesight can be connected to your trading platform. This tool will calculate both FDR and CV income automatically on its premium (paid) New Zealand plans, flagging which holdings are subject to FIF rules and showing the result under both methods for each year. You still file and pay tax yourself, but just like an investment platform, Sharesight eliminates the manual calculation. We understand Hatch also provides FIF tax reports for its users. These tools do not pay the tax for you, but they make the numbers considerably less painful to arrive at.

Prepared by an accountant at year-end

For investors with straightforward direct holdings who do not use a tracking platform, providing your brokerage statements at year-end to an accountant remains entirely workable. An accountant can calculate both FDR and CV, select the better method, and file the IR3 return. The cost of that service should be weighed against the tax saving from optimising the method election. For most investors above the threshold, it will pay for itself.

What is not a workable option is doing nothing. IRD receives financial account information from overseas custodians automatically through the Common Reporting Standard, and of course from New Zealand based platforms and fund managers. Undeclared FIF income will attract penalties and interest.

Frequently Asked Questions

What is the FIF threshold in New Zealand?

The current de minimis threshold is NZ$50,000, based on the total NZD cost you originally paid for all overseas shares and ETFs you hold directly, not their current market value. A proposal announced on 28 May 2026 would raise the threshold to NZ$100,000 from 1 April 2026, subject to legislation. If your cost basis exceeds the threshold on any single day during the tax year, the FIF regime applies to your entire overseas portfolio for the full year. New Zealand-domiciled PIE fund holdings are excluded from this calculation. Tip: Keep brokerage purchase confirmations. The IRD exchange rate on the purchase date is what counts.

Does the FIF threshold apply to market value or cost?

Cost only. The threshold is based on the original NZD purchase price of your overseas holdings, including brokerage fees paid at the time of acquisition. A portfolio bought for $48,000 now worth $80,000 remains below the current $50,000 threshold. A portfolio bought for $55,000 now worth $40,000 is above it. The same cost-basis principle would apply at the proposed $100,000 threshold.

Are Australian shares subject to FIF rules?

Generally not, if held directly. Individual shares listed on the Australian All Ordinaries index are typically exempt from FIF, provided the company maintains a franking account. These holdings are not subject to FDR or CV and do not count toward the FIF cost threshold. Dividends are taxable when received, but Australian franking credits cannot be claimed by New Zealand investors. This exemption does not extend to Australian Unit Trusts or Australian ETFs, which may be subject to FIF depending on their structure. If in doubt, check with your accountant.

Do I pay FIF tax even if my overseas portfolio falls in value?

It depends on the method used.

Under FDR, 5% of the opening market value is treated as taxable income regardless of actual performance.

Under CV, if the portfolio falls in value and pays no dividends, taxable income is zero. Investors above the threshold can elect CV in a down year to avoid paying tax on a declining portfolio.

PIE fund investors do not have this option. The fund uses FDR throughout, though the tax is applied at the lower PIR rate.

What is the difference between the FDR and CV methods?

FDR taxes 5% of the opening market value of your overseas portfolio each year, regardless of actual returns. FDR is generally better when returns exceed 5%.

CV taxes the actual change in portfolio value including dividends. CV is generally better when the portfolio falls or returns very little.

The same method must be applied to your entire overseas portfolio each financial year, but you can switch annually.

Does KiwiSaver count toward the FIF threshold?

No. KiwiSaver is excluded from the personal FIF threshold calculation entirely. Regardless of your KiwiSaver balance, it has no bearing on whether FIF applies to your other investments. The threshold applies only to overseas shares, overseas ETFs, and interests in overseas unit trusts held directly outside a New Zealand PIE structure.

Do New Zealand PIE funds protect me from FIF rules?

Not entirely, but they simplify and reduce them.

A New Zealand-domiciled PIE fund handles FIF at the fund level using FDR. Tax is attributed to investors at their PIR, capped at 28%. Investors file no IR3 return. The fund does not insulate investors from paying tax in a down year under FDR, but it does cap the rate and eliminate all compliance obligations at the personal level. PIE fund holdings also do not count toward the personal FIF cost threshold.

Do I need to file a tax return for my overseas shares in New Zealand?

If you hold overseas shares or ETFs directly with a total cost basis above the FIF threshold (currently $50,000, proposed to rise to $100,000 from 1 April 2026, subject to legislation), you must file an IR3 return each year and calculate FIF income under FDR, CV, or RAM (if eligible). If you invest exclusively through NZ-domiciled PIE funds, no personal filing is required. PIE tax is a final tax handled by the fund manager.

What is the Revenue Account Method and who can use it?

RAM is a FIF calculation method taxing capital gains on disposal at 70% of the gain at the investor's marginal rate (equivalent to a 30% discount), with dividends taxed in full when received. It was enacted in March 2026, effective from the 2025/26 tax year, and initially available only to recent migrants (those becoming fully NZ tax resident on or after 1 April 2024) and to returning New Zealanders who had been non-resident for at least five years. A May 2026 proposal would extend RAM to all NZ tax residents from 1 April 2026 for their unlisted foreign shares, expected to be limited to natural persons and family trusts. An extended version of RAM, covering both listed and unlisted foreign shares, would be available to dual-tax-exposed individuals such as US citizens and Green Card holders. These expansions are subject to legislation. Seek professional tax or accounting advice if RAM may apply to you.

Conclusion: New Zealand's FIF tax

The FIF rules are the ultimate proof that IRD has a sense of humour. A dry one, but still.

You are taxed on money you have not made, using a 25-year-old threshold inflation has rendered absurd. Proposals announced in May 2026 would finally double it, subject to legislation. Either way, complexity is not a reason to overpay, and it is certainly not a reason to ignore the rules entirely. IRD already has the data.

Get the investment decision right first. Then make sure the structure around it is not quietly giving away returns you could have kept. Whether you use a managed platform, a portfolio tracker, or an accountant at year end, the compliance side is solvable. The expensive mistake is never looking at it at all.

If you have read this far and would rather not figure this out alone, our investment team can help. Book a complimentary initial consultation to get started.

^{Become Wealth Limited (FSP249805) is licensed by the Financial Markets Authority (FMA) as both a Discretionary Investment Management Service (DIMS) provider and Financial Advice Provider (FAP). Become Wealth is not an accountant or tax advisory firm, and this material does not constitute tax advice. If your situation is complex, speak with a suitably qualified tax professional.}‍