FDR vs Comparative Value: Which FIF Method Costs a US Expat Less (Worked Numbers)
For New Zealand tax, the Fair Dividend Rate (FDR) method deems 5% of your foreign portfolio's opening value to be taxable income every year — even in a year you lost money. The Comparative Value (CV) method taxes the real change in value instead, so a down year is taxed at zero. In a falling market CV almost always wins on the NZ side; the twist for US citizens is that the lower NZ bill can leave US PFIC tax with no foreign tax credit to soak it up.
If you are a US citizen living in New Zealand, you are caught between two tax systems that disagree about how to tax your overseas shares. New Zealand uses the Foreign Investment Fund (FIF) regime; the United States uses the Passive Foreign Investment Company (PFIC) regime. The single biggest lever you control on the NZ side is which FIF method you use — and in a down year the choice between FDR and CV can be the difference between a tax bill and a zero return.
This guide walks the exact numbers on an $80,000 portfolio that fell 10%, shows when you are locked into a method, and then closes the loop most NZ-only guides skip: how that choice flows into your US PFIC calculation and your foreign tax credit.
FIF rules only bite once your overseas shares cross the de minimis line. Inland Revenue exempts individuals whose attributing FIF interests cost less than NZ$50,000 in total — below that you ignore the FIF rules entirely and just declare dividends. (Note: the Government has proposed doubling this to NZ$100,000 from 1 April 2026; confirm the current figure before you file.) Everything below assumes you are over the threshold. Source: IRD — FIF rules exemptions.
The two methods, in plain English
Fair Dividend Rate (FDR) — the 5% deemed return
FDR ignores what your shares actually did. It assumes — "deems" — that your portfolio earned a flat 5% of its opening market value for the year, and taxes you on that figure at your marginal rate. Inland Revenue states the FDR method "deems the investor to earn income equal to 5% of the opening value of the foreign share each year, regardless of actual income received from the share." For an individual the opening value is measured at the start of the income year — 1 April. Actual dividends and sale gains are generally not separately taxed under FDR (a "quick sale" adjustment applies if you buy and sell the same shares inside the year). Source: IRD QB 23/10 — FIF calculation methods.
Comparative Value (CV) — the actual-gain method
CV taxes what really happened. The formula compares your closing position to your opening position:
CV income = (closing market value + amounts received during the year, e.g. dividends and sale proceeds) − (opening market value + amounts paid in, e.g. purchases).
If the combined result across all your FIF holdings is a loss, your FIF income is treated as zero — you cannot use a FIF loss to shelter your other income such as salary or NZ interest. Source: IRD Tax Technical — Choice of FIF calculation method.
That single sentence — losses floor at zero — is the whole game. FDR can tax you in a year you lost money. CV cannot tax you below zero. So in a falling market, CV is structurally cheaper on the NZ side.
Worked example: an $80,000 portfolio that fell 10%
Meet Daniel. A US citizen on a work visa in Wellington. On 1 April 2025 his US index ETFs (held in a US brokerage) had a market value of NZ$80,000. He is over the NZ$50,000 de minimis, so the FIF rules apply. Over the year markets fell; by 31 March 2026 the same shares were worth NZ$72,000 — a 10% drop. He received NZ$1,200 of dividends, reinvested, and bought and sold nothing else. Daniel's NZ marginal tax rate is 33%.
FDR method:
- Deemed income = 5% × opening value = 5% × NZ$80,000 = NZ$4,000
- (Actual dividends and the loss are ignored under FDR.)
- NZ tax = 33% × NZ$4,000 = NZ$1,320
Daniel's portfolio fell NZ$8,000, yet FDR hands him NZ$4,000 of "phantom" income and a NZ$1,320 tax bill.
CV method:
- Closing value + dividends received = NZ$72,000 + NZ$1,200 = NZ$73,200
- Opening value + purchases = NZ$80,000 + NZ$0 = NZ$80,000
- CV income = NZ$73,200 − NZ$80,000 = −NZ$6,800 → a loss
- Because the overall FIF result is a loss, FIF income is treated as NZ$0
- NZ tax = 33% × NZ$0 = NZ$0
The verdict for the year: CV saves Daniel the full NZ$1,320. In a down year, the actual-gain method wins outright.
| Method | What it taxes | Daniel's taxable FIF income | NZ tax at 33% |
|---|---|---|---|
| FDR (5% deemed) | 5% of opening value, regardless of reality | NZ$4,000 | NZ$1,320 |
| CV (actual gain) | Real change in value + income; loss = 0 | NZ$0 | NZ$0 |
| Difference | — | −NZ$4,000 | −NZ$1,320 |
The mirror case matters too: in a strong year FDR usually wins. If Daniel's portfolio had risen 20% to NZ$96,000, CV would tax the real ~NZ$17,200 gain, while FDR would still cap his income at NZ$4,000. FDR effectively caps your taxable return at 5% of opening value — a ceiling that is generous when markets run hot and brutal when they fall.
The switch rules — what you're locked into
Inland Revenue is unusually flexible here for individuals, but there are two hard rules people miss.
Rule 1: You can swap FDR ↔ CV every year
A natural person (and certain family/charitable trusts) can "change between the fair dividend rate and comparative value methods in consecutive years without restriction." You are not locked into the method you used last year. Practically, that means you re-run both calculations each 31 March and pick the lower outcome. Source: IRD Tax Technical — Choice of FIF calculation method.
Rule 2: No cherry-picking within a year
This is the trap. IRD's rule: "If a natural person … chooses to apply a comparative value method to any of their FIF interests, they cannot use the fair dividend rate method or the cost method for any of their other FIF interests." In other words, the choice is all-or-nothing across your whole FIF portfolio for that year. You cannot put your winners on FDR and your losers on CV in the same return. If you elect CV for one holding, every attributing FIF interest you own must use CV (or the attributable-FIF-income method) that year.
Each year: total your whole FIF portfolio's opening and closing values, run FDR (5% of total opening) and CV (total actual gain, floored at zero), and choose the method that gives the lower figure for the portfolio as a whole. You may switch next year. Just don't try to mix methods inside one year.
Now the US side: how each method feeds your PFIC bill
This is where most NZ guides stop and US expats get blindsided. Your US tax return does not care which NZ method you picked — your US-citizen US shares are usually not PFICs at all, but any non-US pooled fund (a NZ-domiciled fund, an Australian or Irish-domiciled ETF, many KiwiSaver underlying funds) is almost certainly a PFIC, taxed under IRS Form 8621. The US runs its own parallel calculation, most often the mark-to-market election or the punitive default Section 1291 excess-distribution rules. See IRS — About Form 8621.
The connection between the two systems is the foreign tax credit (FTC): the NZ tax you actually pay on that income can offset the US tax on the same income (claimed on IRS Form 1116). And that is exactly where the FDR-vs-CV choice quietly reshapes your US bill.
Down year: CV's zero NZ tax can backfire on the US side
In Daniel's down year, CV gave him NZ$0 of NZ tax. Great for New Zealand. But a US mark-to-market PFIC calculation might still show a small gain on certain lots, or the IRS may tax a distribution — and now Daniel has zero NZ tax to credit against it. The cheaper NZ method left him with no FTC ammunition. FDR, by contrast, would have generated NZ$1,320 of NZ tax, some of which could have been credited against the US bill on the same fund.
When CV creates a bigger NZ bill that actually USES the US credit
Flip it to an up year and the logic inverts in a useful way. Suppose Daniel's PFIC fund is on the US mark-to-market election, so the US taxes his full unrealised gain as ordinary income. In a strong year:
| Scenario (up year, US MTM PFIC) | NZ taxable income | NZ tax (33%) | US tax on same gain | Net of FTC |
|---|---|---|---|---|
| FDR — caps NZ income at 5% | NZ$4,000 | NZ$1,320 | Tax on full ~NZ$17,200 gain | Only NZ$1,320 credit → larger residual US tax |
| CV — taxes full actual gain | ~NZ$17,200 | ~NZ$5,676 | Tax on full ~NZ$17,200 gain | Far more NZ tax to credit → smaller residual US tax |
Here CV produces a bigger NZ bill — but because the US is taxing the same gain under mark-to-market, that larger NZ tax becomes a larger foreign tax credit, soaking up the US liability. The "expensive" NZ method can be the cheaper combined outcome. The lesson: in a year where the US will tax the real gain anyway, deliberately choosing the method that creates matching NZ tax can be the better play — the opposite of the NZ-only instinct to minimise NZ tax in isolation.
The FTC only works if the income is taxed in the same year in both countries and falls in the same FTC category. FDR's deemed 5% and a US mark-to-market gain rarely match in size or timing, so credits routinely "strand." This is the single most expensive cross-border mistake we see — optimise the NZ method in a vacuum and you can lose the FTC entirely. Model both returns together, not separately.
- FDR = 5% of opening value, taxed even in a losing year. CV = real gain, floored at zero. In a down year, CV almost always wins on the NZ side.
- On an $80,000 portfolio that fell 10%, FDR taxed NZ$4,000 of phantom income (NZ$1,320 tax at 33%); CV taxed NZ$0. CV saved the full NZ$1,320.
- You can switch FDR ↔ CV every year, but you cannot mix methods within a single year — choosing CV for one holding forces CV across your whole FIF portfolio.
- The cheapest NZ method is not always the cheapest combined. A zero-NZ-tax CV year can leave you with no foreign tax credit against US PFIC tax; a larger CV bill in an up year can fully offset a US mark-to-market gain.
- Model the NZ and US returns together. The de minimis is currently NZ$50,000 (proposed NZ$100,000 from 1 April 2026 — verify before filing).
How to actually run this each year
- Confirm you are over the de minimis (cost of all FIF interests ≥ NZ$50,000; check the current figure).
- Pull your 1 April opening and 31 March closing market values for every overseas holding, plus dividends and any buys/sells.
- Run FDR (5% × total opening) and CV (total actual gain, loss floored at zero) for the whole portfolio. Inland Revenue's FIF calculator will produce both.
- Before you pick the lower NZ figure, check your US side: is the same fund a PFIC, and on what election? If the US will tax a real gain this year, the method that generates matching NZ tax may give the better combined result via the foreign tax credit.
- Document the choice. You may change methods next year without penalty — but keep the working in case IRD or the IRS asks.
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Frequently asked questions
What exactly is the Fair Dividend Rate percentage?
5% of the opening market value of your foreign shares at the start of the income year (1 April for individuals). Inland Revenue describes FDR as deeming income equal to 5% of the opening value of the foreign share each year, regardless of the actual income received. Actual dividends and sale gains are generally not separately taxed under FDR, though a quick-sale adjustment applies if you buy and sell the same shares within the year.
Can I use CV for my losing shares and FDR for my winners in the same year?
No. IRD's rule is all-or-nothing: if you apply the comparative value method to any of your FIF interests, you cannot use the fair dividend rate (or cost) method for any of your other FIF interests that year. You can, however, switch methods the following year without restriction.
If CV gives me a loss, can I use it to reduce my salary tax?
No. Under CV, if your combined FIF result across all holdings is a loss, your FIF income is treated as zero — you cannot offset a FIF loss against other income such as salary or NZ interest. The benefit of CV in a down year is paying zero on the FIF income, not generating a deductible loss.
Does my NZ FIF method change my US PFIC tax?
Not directly — the US runs its own PFIC calculation on Form 8621 regardless of your NZ method. The link is the foreign tax credit: the NZ tax you actually pay can offset US tax on the same income via Form 1116. A method that produces little or no NZ tax can leave you with no credit to offset US PFIC tax, so the cheapest NZ method is not always the cheapest combined result.
Which method should a US expat default to in a falling market?
On the NZ side, CV — it taxes the real result and floors a loss at zero, so a down year costs nothing. But check the US side first: if a US mark-to-market election will tax a gain on that fund anyway, the larger NZ tax that FDR or an up-year CV produces may be more valuable as a foreign tax credit. Model both returns together before deciding.
What is the FIF de minimis threshold?
Currently NZ$50,000 — if your attributing FIF interests cost less than NZ$50,000 in total, you do not apply the FIF rules and simply declare dividends. The Government has proposed doubling the threshold to NZ$100,000 from 1 April 2026; confirm the current figure with IRD before you file.