KiwiSaver tax: NZ rules and US reporting guide (2026)
KiwiSaver is New Zealand's voluntary workplace retirement scheme, established under the KiwiSaver Act 2006.
KiwiSaver tax runs on three layers: employee contributions are deducted from gross pay through payroll, but PAYE tax still applies to the full gross salary (there is no reduction in NZ taxable income, unlike a US pre-tax 401(k)); employer contributions are taxed via Employer Superannuation Contribution Tax (ESCT) at 10.5%–39%; and investment earnings are taxed inside the fund at the member's Prescribed Investor Rate (PIR) of 10.5%, 17.5%, or 28%.
For US citizens and Green Card holders, the picture extends to the US return. KiwiSaver is treated as a Passive Foreign Investment Company (PFIC) under US tax law, which triggers annual Form 8621, FBAR reporting above the threshold, FATCA disclosure on Form 8938, and Form 3520 in scheme-specific cases.
Most KiwiSaver funds meet the PFIC definition, but the analysis applies fund by fund.
This guide sits alongside our broader US expat tax guide for Americans living in New Zealand.
Published by Taxes for Expats (TFX), a US-based specialist tax firm with 20+ years of working with Americans abroad and 50,000+ clients across 193 countries.
Key facts
- PIR options: 10.5%, 17.5%, or 28% – capped at 28% even for members in the 33% or 39% personal income tax bracket. Income thresholds updated 1 April 2025.
- Employee contribution: calculated as a percentage of gross salary or wages and deducted through payroll; it does not reduce NZ taxable salary as a separate deduction. Default rises in two steps – 3% to 3.5% on 1 April 2026, and 3.5% to 4% on 1 April 2028.
- Employer contribution: subject to ESCT at 10.5%–39%. Default minimum tracks the employee rate – 3.5% from 1 April 2026, 4% from 1 April 2028.
- Government member tax credit: up to $260.72 per year (effective 1 July 2025; halved from $521.43), paid when the member contributes at least $1,042.86 between 1 July and 30 June. Members with prior-year taxable income above $180,000 are not eligible.
- KiwiSaver withdrawals: tax-free in NZ at age 65, first home (3+ years' membership), financial hardship, serious illness, and permanent emigration – the US tax result depends on the specific PFIC or trust facts; foreign retirement distributions can be partly or fully taxable.
- US classification: most KiwiSaver funds are classified as PFICs; the analysis applies fund by fund.
- US annual reporting: Form 8621 per KiwiSaver fund, filed with Form 1040.
- FBAR threshold: aggregate foreign account balances above $10,000 at any point during the calendar year.
- Form 8938 (FATCA) threshold for expats: $200,000 on December 31 / $300,000 at any point (single or married filing separately).
- Form 3520: may apply depending on whether the specific KiwiSaver scheme is structured as a grantor trust.
How KiwiSaver is taxed in New Zealand
KiwiSaver is structured as a Portfolio Investment Entity (PIE) fund. New Zealand taxes the investment returns at the member's PIR, not at the member's marginal personal income tax rate.
Employee contributions are deducted from gross salary before NZ income tax. Employer contributions go through ESCT before they hit the member's account.
Prescribed Investor Rate (PIR) – KiwiSaver investment earnings tax
The KiwiSaver tax rate on earnings is the PIR, capped at 28% even when the member sits in the 33% or 39% NZ personal income tax bracket.
A member in the 39% bracket who holds the equivalent investments outside a PIE fund pays 11 percentage points more in tax on the same earnings. The cap is the core KiwiSaver tax benefits story for high earners.
The PIR is capped at 28% regardless of the member's personal income tax rate, creating a structural KiwiSaver tax advantage of up to 11 percentage points for high earners.
| PIR | Prior-2-years taxable income | Prior-2-years total income (incl. PIE) |
|---|---|---|
| 10.5% | up to NZD $15,600 | up to NZD $53,500 |
| 17.5% | up to NZD $53,500 | up to NZD $78,100 |
| 28% | above either threshold | – |
Thresholds reflect the 1 April 2025 update aligning PIR brackets to the new PAYE thresholds. The qualifying rate is the lower of the two columns.
Your PIR is set by your prior-2-years taxable income, with the qualifying brackets published by IRD. The default PIR, if you don't choose one, is 28%.
Employee contributions – before or after tax?
KiwiSaver employee contribution rates are 3%, 4%, 6%, 8%, or 10% of gross pay. The default rises to 3.5% from 1 April 2026 and to 4% from 1 April 2028, phased in over a three-year window.
KiwiSaver is deducted before tax at the payroll level for the standard contribution rates. A member contributing 3.5% of an NZD $70,000 salary contributes NZD $2,450 from pre-tax income, with the contribution coming out of gross pay before NZ personal income tax is applied.
Voluntary contributions above the standard payroll rates can be paid directly to the KiwiSaver provider, and these are also not subject to NZ personal income tax in the year contributed.
From 1 April 2026, members who want to keep contributing at 3% (instead of 3.5%) can apply to IRD for a temporary rate reduction for between 3 and 12 months. The reduction can be re-applied for after each 12-month window.
Employer contributions and ESCT
Employers must contribute a minimum of 3.5% of gross salary or wages to KiwiSaver from 1 April 2026 (up from 3%), and 4% from 1 April 2028. Employer contributions are subject to ESCT at 10.5%–39%, withheld and remitted by the employer before the net amount lands in the member's account.
ESCT applies to the employer contribution at rates from 10.5% to 39%, based on the employee's prior-year salary plus prior-year employer contributions – not on current-year earnings.
| Annual income + employer contributions | ESCT rate |
|---|---|
| up to NZD $18,720 | 10.5% |
| NZD $18,721 – $64,200 | 17.5% |
| NZD $64,201 – $93,720 | 30% |
| NZD $93,721 – $216,000 | 33% |
| over NZD $216,000 | 39% |
Each employee's bracket is determined by adding prior-year salary to prior-year employer KiwiSaver contributions, then matching the total against the ESCT rate schedule. Unlike PAYE, ESCT is not tiered – one rate applies to the entire employer contribution.
KiwiSaver government member tax credit
IRD pays a member tax credit of up to $260.72 per KiwiSaver tax year to eligible members. The credit equals 25 cents for every NZD $1 of member contributions, halved from 50 cents on 1 July 2025.
To receive the full $260.72, the member must contribute at least NZD $1,042.86 between 1 July and 30 June – about NZD $20.07 a week. Only personal contributions count; employer contributions and the credit itself don't count toward the $1,042.86 trigger.
Eligibility from 1 July 2025:
- age 16 to 65
- mainly resident in New Zealand
- annual taxable income of $180,000 or less (no KiwiSaver tax rebate above this threshold)
- contributed at least NZD $1,042.86 in personal contributions during the 1 July–30 June year
For US citizens, the KiwiSaver tax credit is treated as taxable ordinary income on Form 1040 in the year IRD pays it. The full mechanics and eligibility test are set out in IRD's government contribution rules.
KiwiSaver withdrawals – NZ tax treatment
For US citizens, every withdrawal type is reportable on the US return regardless of NZ treatment.
All 5 KiwiSaver withdrawal types are tax-free under NZ law – but the US tax result depends on the specific PFIC or trust facts; distributions can be partly or fully taxable.
| Withdrawal type | NZ treatment | US treatment |
|---|---|---|
| Retirement (age 65+) | Tax-free | Partly or fully taxable on the US return; result depends on PFIC or trust classification |
| First home (3+ years' membership) | Tax-free | Partly or fully taxable on the US return; result depends on PFIC or trust classification |
| Financial hardship | Tax-free | Partly or fully taxable on the US return; result depends on PFIC or trust classification |
| Serious illness | Tax-free | Partly or fully taxable on the US return; result depends on PFIC or trust classification |
| Permanent emigration | Tax-free | Partly or fully taxable on the US return; result depends on PFIC or trust classification |
The answer to whether KiwiSaver withdrawals are taxed is country-dependent: tax-free in New Zealand at the qualifying events above, and partly or fully taxable on the US return depending on the specific PFIC or trust facts. A permanent move to Australia follows different KiwiSaver transfer rules.
KiwiSaver and US tax – reporting obligations for US citizens
A US citizen or Green Card holder who participates in KiwiSaver faces up to 4 separate US reporting obligations: annual PFIC reporting on Form 8621, FBAR with FinCEN, FATCA disclosure on Form 8938, and Form 3520 (and 3520-A) where the scheme is a grantor trust.
Each has its own threshold, deadline, and penalty structure. The bigger picture for any US person holding foreign retirement or pooled investments is covered in our guide to foreign investment tax for US expats.
KiwiSaver as a PFIC – Form 8621
For US reporting, KiwiSaver should be analyzed fund by fund under the PFIC rules. A KiwiSaver fund is a PFIC if it is a foreign corporation that earns at least 75% of gross income from passive sources – interest, dividends, and capital gains. If the specific scheme interest is PFIC stock, Form 8621 applies.
The Mark-to-Market (MTM) election is the only PFIC method available in practice for most KiwiSaver members, because NZ KiwiSaver providers do not issue the PFIC Annual Information Statement required for the QEF election.
| Method | How it works | Availability for KiwiSaver |
|---|---|---|
| Mark-to-Market (MTM, §1296) | Annual unrealized gain reported as ordinary income; losses limited to prior MTM inclusions | Available if KiwiSaver units count as marketable stock; widely used in practice |
| Qualified Electing Fund (QEF, §1295) | Pro-rata share of ordinary earnings and net capital gain reported each year, with capital-gain character preserved | Requires a PFIC Annual Information Statement; NZ providers generally do not issue one |
| Excess Distribution (default, §1291) | Distributions and gain on sale taxed at top ordinary rates, plus an interest charge for deferral | Applies by default if no valid MTM or QEF election; usually the worst outcome |
The MTM election has to be made on a timely-filed Form 8621 in the first KiwiSaver PFIC year. The mechanics of all three regimes – including how MTM, QEF, and the default §1291 method actually play out – are covered in our PFIC tax rules guide.
MTM gain or loss flows onto Schedule 1 (Form 1040), line 8z, as other income. The current form-level rules sit in the IRS Form 8621 instructions.
KiwiSaver on FBAR
A US person files an FBAR (FinCEN Form 114) when the aggregate maximum balance of foreign financial accounts exceeds $10,000 at any point during the calendar year.
KiwiSaver is a foreign financial account, so its year-maximum NZD balance converts to USD and feeds the aggregate calculation.
The 2025 non-willful FBAR penalty is $16,536 per report (31 U.S.C. §5321(a)(5)(B)) – capped per FBAR rather than per account under the 2023 Supreme Court ruling in Bittner v. United States. The willful penalty is $165,353 or 50% of the account balance, whichever is greater (31 U.S.C. §5321(a)(5)(C)), assessed per account per year.
KiwiSaver counts toward the FBAR aggregate. A US citizen with NZD $22,000 in KiwiSaver and NZD $8,500 in an NZ bank account holds roughly USD $18,100 across accounts – above the $10,000 threshold and filing-required.
| Rule | Detail |
|---|---|
| Filing form | FinCEN Form 114, filed online via the BSA E-Filing System |
| Threshold | $10,000 aggregate maximum across all foreign accounts |
| Period | Calendar year |
| Due date | April 15, with automatic extension to October 15 |
| Value reported | Maximum balance during the year, converted to USD |
| Where it's filed | FinCEN (Treasury), not IRS |
US citizens in New Zealand often hold both KiwiSaver FBAR-reportable funds and ordinary NZ bank accounts. The two foreign-asset regimes have different thresholds and different filing destinations, which our FBAR vs. FATCA comparison walks through in detail.
KiwiSaver under FATCA – Form 8938
A US citizen residing abroad files Form 8938 when specified foreign financial assets exceed $200,000 on December 31 (single or MFS) or $300,000 at any point during the year.
KiwiSaver is a specified foreign financial asset for KiwiSaver FATCA purposes. Form 8938 is filed with Form 1040 and does not replace FBAR – in most cases, both apply. Failure to file Form 8938 carries an initial penalty of $10,000, with continuing penalties of up to $50,000 if the failure persists after IRS notice.
Form 8938 thresholds for US citizens abroad are 4× higher than for US-resident filers: $200,000 year-end or $300,000 any-point for single and MFS filers, and $400,000 / $600,000 for married filing jointly.
| Filing status | Year-end threshold | Any-point threshold |
|---|---|---|
| Single or MFS (abroad) | $200,000 | $300,000 |
| Married filing jointly (abroad) | $400,000 | $600,000 |
| Single or MFS (in US) | $50,000 | $75,000 |
| Married filing jointly (in US) | $100,000 | $150,000 |
Form 3520 – KiwiSaver as a foreign trust
Whether a US KiwiSaver member files Form 3520 depends on how the specific KiwiSaver scheme's trust deed is structured.
KiwiSaver schemes set up as grantor trusts require the US member to file Form 3520 annually, and the trustee to file Form 3520-A. Schemes structured as non-grantor employer trusts are generally outside Form 3520 reporting.
The Form 3520 obligation is scheme-specific. The same US member may need to file for one provider and not for another, depending on each scheme's trust deed.
| KiwiSaver structure | Form 3520 (member) | Form 3520-A (trustee) |
|---|---|---|
| Grantor trust | Required annually | Required annually |
| Non-grantor employer trust | Generally not required | Generally not required |
| Uncertain classification | Conservative position: file Form 3520 | Determined by trustee analysis |
The grantor vs. non-grantor threshold question turns on the classification factors covered in our explainer on what counts as a foreign trust under US tax law, with the underlying IRS framework set out under foreign trust reporting requirements.
Limited relief from Form 3520 and 3520-A may apply to certain tax-favored foreign retirement trusts under Rev. Proc. 2020-17, and current IRS instructions also note reliance on proposed regulations for eligible tax years until final regulations are issued.
KiwiSaver and US double taxation – how to reduce the burden
A US citizen in New Zealand who participates in KiwiSaver may owe tax on the same earnings in both countries.
The US–NZ income tax treaty does not automatically remove US tax or reporting for a US citizen; treaty treatment depends on the specific article, and the saving clause can preserve US tax on citizens and residents.
Three mechanisms can reduce or eliminate the exposure: the Foreign Tax Credit on Form 1116, the timing of PFIC elections, and the MTM basis carry-forward at withdrawal.
Foreign Tax Credit and KiwiSaver
A US citizen who pays PIE tax on KiwiSaver in New Zealand can claim a Foreign Tax Credit on Form 1116 to offset the corresponding US tax.
The complication is sourcing. Under the MTM election, gain on PFIC stock held by a US person is generally treated as US-source under the §865 sourcing rules. The §904 limitation then restricts the FTC on NZ PIR tax allocable to the same earnings, because the FTC limitation requires foreign-source income in the relevant basket.
A US citizen in the 28% NZ bracket who pays 28% PIR on KiwiSaver earnings can still owe US tax on the same earnings if the MTM gain is sourced to the US. The net exposure has to be worked out year by year on Form 1116.
FEIE and KiwiSaver
The Foreign Earned Income Exclusion (FEIE) excludes up to $130,000 of foreign earned income from US tax for tax year 2025 (Rev. Proc. 2024-40), rising to $132,900 for 2026 (Rev. Proc. 2025-32).
KiwiSaver earnings are passive investment income, not earned income, so they fall outside the FEIE's scope. FEIE cannot be applied to KiwiSaver investment returns, employer contributions, or the member tax credit.
Applying FEIE to KiwiSaver earnings is one of the more common errors on US expat returns in New Zealand. It understates US taxable income and can trigger a deficiency notice.
Step-by-step: how a US citizen reports KiwiSaver on Form 1040
A US citizen with KiwiSaver completes the following 6 steps when preparing Form 1040. The sequence assumes the MTM election – the only PFIC method available in practice for most KiwiSaver members, since NZ providers do not issue PFIC Annual Information Statements.
- Get the year-end statement. Request a December 31 account statement from the KiwiSaver provider showing the NZD balance.
- Convert NZD to USD. For the MTM gain or loss calculation, apply the IRS yearly average exchange rate for the tax year to income items, and document the rate used. For FBAR and Form 8938 balance reporting, use the year-end or maximum account value converted at the applicable Treasury year-end rate.
- Calculate the MTM gain or loss. Subtract the prior December 31 USD value from the current December 31 USD value. A gain is ordinary income; a loss is an ordinary loss, limited to prior cumulative MTM gains.
- Report the MTM amount. Enter the gain or loss on Form 8621, Part IV (MTM election section), and carry the figure to Schedule 1 (Form 1040), line 8z, as other income.
- File FBAR if required. If aggregate foreign account balances exceeded $10,000 at any point during the year, file FinCEN Form 114 and report each KiwiSaver fund at its maximum NZD balance during the year, converted to USD.
- Attach Form 8938 if required. If total specified foreign financial assets exceeded $200,000 on December 31 (single or MFS filers abroad), attach Form 8938 to Form 1040.
Based on a TFX client scenario: a US nurse in Wellington with NZD $22,000 in KiwiSaver and NZD $8,500 in an ANZ savings account had combined foreign balances of NZD $30,500 – roughly USD $18,100 at the 2025 average rate.
FBAR was required. The client had not filed FBAR for 3 prior years, with non-willful penalty exposure of up to $49,608 ($16,536 × 3 reports). The matter was resolved through the Streamlined Foreign Offshore Procedures at $0 penalty.
Common KiwiSaver tax mistakes by US expats
The 5 most common KiwiSaver tax errors made by KiwiSaver US expat members carry penalty exposure ranging from $16,536 per report (non-willful FBAR) to 50% of account balance (willful FBAR), plus US tax liability at rates up to 37% when the default Excess Distribution method applies.
The following 5 mistakes show up most often on the US returns we review:
1. Not filing Form 8621.
Many US citizens join KiwiSaver through their employer without realizing the KiwiSaver PFIC filing obligation starts in year one of membership – even when no distributions are received and nothing is withdrawn.
2. Missing the MTM election in year one.
The MTM election has to be made on a timely-filed Form 8621 for the first PFIC year. Filing late or on an amended return without IRS consent under Rev. Proc. 2013-39 voids the MTM election.
The default Excess Distribution method (IRC §1291) then applies, which can push effective tax rates above 50% on distributions once the interest charge is added.
3. Omitting KiwiSaver from FBAR.
A US citizen with NZD $22,000 in KiwiSaver and NZD $8,500 in a NZ bank account holds roughly USD $18,100 in aggregate – above the $10,000 FBAR threshold. Omitting KiwiSaver exposes the taxpayer to the $16,536 non-willful penalty per report of non-filing (31 U.S.C. §5321(a)(5)(B)).
4. Applying FEIE to KiwiSaver earnings.
KiwiSaver investment returns, employer contributions, and the member tax credit are passive income, not earned income. The FEIE applies only to earned income. Applying it here understates US taxable income and can trigger a deficiency notice.
5. Wrong Form 3520 call.
Filing Form 3520 for a scheme structured as a non-grantor employer trust creates unnecessary compliance cost. Not filing for a scheme structured as a grantor trust exposes the member to penalties of 35% of the gross reportable amount (IRC §6677).
The right answer requires reading the trust deed of the specific KiwiSaver scheme.
FAQ
KiwiSaver investment earnings are taxed in New Zealand at the PIR – 10.5%, 17.5%, or 28%. Employee contributions are deducted from gross salary before NZ personal income tax. For US citizens, KiwiSaver is additionally taxed on the US return as a PFIC, with Form 8621 filed annually for each KiwiSaver fund held.
The KiwiSaver tax rate in NZ on investment earnings is the PIR, capped at 28% regardless of personal income tax bracket. Employer contributions are taxed via ESCT at 10.5%–39% based on prior-year income plus prior-year employer contributions. Employee contributions are not subject to NZ income tax in the year contributed.
KiwiSaver employee contributions are deducted from gross salary before NZ personal income tax. The default contribution rate rises to 3.5% from 1 April 2026 and to 4% from 1 April 2028. Inside the fund, earnings are taxed at the PIR rather than at the member's personal income tax rate.
PIE tax on KiwiSaver is the PIR applied by the fund provider to investment returns before earnings are credited to the member's account. The PIR ranges from 10.5% to 28% based on prior-2-years taxable income (thresholds aligned with PAYE brackets on 1 April 2025). If your PIR is set too high, IRD refunds the overpaid tax through the year-end square-up; if too low, IRD bills you for the shortfall.
Employee contributions are deducted through payroll as a percentage of gross salary or wages; they do not reduce NZ taxable income as a separate deduction under NZ tax law. Employer contributions are taxed via ESCT before they hit the member's account.
Most KiwiSaver funds meet the PFIC definition under IRC §1297 as foreign corporations earning at least 75% of gross income from passive sources, but the analysis applies fund by fund. US citizens file Form 8621 annually for each KiwiSaver fund held – one form per fund, attached to Form 1040.
Yes. KiwiSaver is a foreign financial account for FBAR purposes. US citizens include KiwiSaver in FinCEN Form 114 when aggregate maximum foreign account balances exceed $10,000 at any point during the calendar year. The 2025 non-willful FBAR penalty is $16,536 per report; the willful penalty is $165,353 or 50% of the account balance per account, whichever is greater.
IRD credits up to $260.72 per year (halved from $521.43 effective 1 July 2025) to eligible members aged 16 to 65 who contribute at least NZD $1,042.86 between 1 July and 30 June. Members with annual taxable income above $180,000 are not eligible. For US citizens, the credit is taxable ordinary income on Form 1040 in the year the IRD pays it.
KiwiSaver withdrawals are tax-free under NZ law for retirement (age 65+), first home purchase (3+ years' membership), financial hardship, serious illness, and permanent emigration. For US citizens, every withdrawal type is reportable on the US return regardless of NZ treatment. The US tax result depends on the specific PFIC or trust facts; distributions can be partly or fully taxable.
No. The US–New Zealand treaty does not automatically remove US tax or reporting for a US citizen; treaty treatment depends on the specific article, and the saving clause can preserve US tax on citizens and residents. US citizens report and pay US tax on KiwiSaver earnings annually under the PFIC rules, regardless of treaty provisions. The treaty also does not eliminate FBAR, Form 8938, or Form 3520 filing where the relevant thresholds and conditions are met.
