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KiwiSaver PIE Tax Explained NZ: How the PIE Fund Structure Works

Updated

KiwiSaver funds are structured as PIEs (Portfolio Investment Entities). This is a specific tax structure that affects how your investment returns are taxed, including the returns on the overseas shares most funds hold, and in most cases it works in members’ favour.

What Is a PIE Fund?

A PIE (Portfolio Investment Entity) is a type of investment fund that has a special tax status under New Zealand tax law. Rather than passing investment income through to members, who then pay tax at their personal marginal rate, a PIE fund:

  • Calculates the tax on each member’s share of investment income internally
  • Applies each member’s individual PIR (prescribed investor rate) to their portion of the income
  • Deducts the tax inside the fund before reporting after-tax returns to members
  • Reports the tax already paid to IRD on behalf of each member

The net effect is that your KiwiSaver returns are shown after tax: you don’t pay any additional tax on KiwiSaver investment income in your annual tax return (see KiwiSaver and your tax return).

PIE Tax vs Income Tax: The Key Difference

This is where the PIE structure often benefits members:

Tax situation How it’s taxed
Wages / salary Taxed at your marginal income tax rate (up to 39%)
Bank interest Taxed at your marginal income tax rate
KiwiSaver / PIE returns Taxed at your PIR (max 28%)

For a member earning over $78,100 (marginal income tax rate 33%), their KiwiSaver investment income is taxed at 28%, 5 percentage points lower than their marginal rate. For a high earner subject to the 39% top rate (income over $180,000), the PIE cap of 28% is a saving of 11 percentage points on their investment income.

For lower-income members, the benefit is different: PIR rates of 10.5% or 17.5% match (or are close to) their marginal rate, meaning there’s little difference, but also no disadvantage.

How PIE Tax Is Calculated Inside the Fund

Each KiwiSaver (PIE) fund year, the following process occurs:

  1. The fund earns investment income: dividends from shares, interest from bonds, realised capital gains from sold assets, and foreign investment income
  2. The fund calculates each member’s attributed income: your proportional share of the total fund income, based on your balance
  3. PIR tax is deducted: the fund applies your nominated PIR to your attributed income and deducts the tax
  4. After-tax returns are reported: your unit price and balance reflect the return after PIE tax
  5. IRD receives a tax certificate: your provider files the tax with IRD, confirming your PIE income and tax paid

You receive a PIE income statement each year (available from your provider or in myIR) showing your attributed income and PIE tax paid. This appears as a separate line in myIR but does not form part of your taxable income for personal income tax purposes.

Tax on Overseas Investments Inside KiwiSaver (FIF Rules)

New Zealand does not have a general capital gains tax. However, KiwiSaver funds invest heavily in overseas shares, which are taxed under the Foreign Investment Fund (FIF) regime: NZ tax is paid on offshore equity returns each year, even when those returns haven’t been realised as dividends or sales.

The main FIF calculation method is the fair dividend rate (FDR): the deemed income is 5% of the opening market value of the offshore holdings each year, whatever they actually returned. In a year when offshore shares return 15%, tax is paid only on the deemed 5%; in a flat or negative year, tax is still paid on the deemed 5%.

Inside KiwiSaver, the fund handles this, not you. The PIE fund calculates the FIF income on its offshore holdings and taxes each member’s share at their PIR (maximum 28%), before unit prices are calculated. You never see a separate FIF bill: you don’t file FIF calculations in your IR3 for your KiwiSaver, and the after-fee, after-tax returns your provider reports already reflect it.

Australian shares: shares in companies that qualify for the Australian exemption (ASX-listed, Australian tax resident and maintaining a franking account) are outside the FIF rules; their dividends are taxed as income instead.

For NZ shares (NZX): Capital gains on NZ equities held by KiwiSaver funds are generally not subject to tax, only dividends are. This creates a different tax treatment for NZ vs international holdings within the same fund, which fund managers account for in their reporting.

Offshore shares or funds you hold directly, outside KiwiSaver or another PIE, are taxed under the FIF rules at your personal level once your offshore holdings pass the FIF threshold; the FIF tax guide covers the threshold, the calculation methods and what goes in your return.

What the PIE Structure Means for You in Practice

Your published returns are already after-tax

When your provider reports a fund return of “8.5% for the year,” that figure is after fees and after PIE tax at the applicable rate. You don’t need to calculate or pay additional tax on top of this.

You don’t include KiwiSaver income in your tax return

At the correct PIR, PIE tax on KiwiSaver returns is a final tax. The income does not need to be declared on your IR3, and there is nothing more to pay. If your PIR was wrong, IRD’s end-of-year PIE calculation in your annual assessment adds a PIE debt or gives a PIE credit for the difference.

Your PIR sets how much of the return you keep

A member on a 10.5% PIR keeps more of the same fund return than a member on 28%; which PIR rate applies to you depends on your income in the previous two years.

Losses inside a PIE fund

If a KiwiSaver fund has a negative return year (like the industry-wide losses in 2022), there is no tax on that year’s investment income — because there is no income. PIE losses cannot be offset against your personal income tax. They simply reduce your fund balance.

Other PIEs Beyond KiwiSaver

The PIE structure is not unique to KiwiSaver. Other PIE investments in New Zealand include:

  • Term deposits with PIE status (offered by most major banks)
  • Managed funds on platforms like InvestNow, Kernel, and SuperLife (outside KiwiSaver)
  • Listed PIEs — some NZX-listed entities have PIE status

A key difference with non-KiwiSaver PIE investments: you can choose the PIR rate that applies to those investments separately from your KiwiSaver PIR. For KiwiSaver, your provider applies the PIR you’ve nominated with them.

The PIE Advantage: A Concrete Example

Scenario: Mark earns $85,000/year. His marginal income tax rate is 33% (on income $78,101–$180,000). He earns $7,000 in investment returns from his KiwiSaver growth fund.

Tax treatment Tax on $7,000 return After-tax return
Taxed at marginal rate (33%) $2,310 $4,690
Taxed at PIR (28%) $1,960 $5,040
PIE advantage $350 saved

Over a 30-year career, the PIE advantage for a mid-to-high earner compounds significantly. Combined with the government contribution and employer contributions, the PIE structure is one of several reasons KiwiSaver is a highly tax-efficient savings vehicle.

Frequently Asked Questions

Does KiwiSaver PIE tax affect my income tax return? No, as long as your PIR is correct. PIE tax at the right rate is a final tax, deducted inside the fund, and KiwiSaver investment income is not included in your personal tax return. A wrong PIR is squared up by IRD’s end-of-year PIE calculation in your annual assessment.

Is the PIE structure available for non-KiwiSaver investments? Yes. Many managed funds, term deposits, and other investments offer a PIE structure with the same PIR-based tax treatment. These are separate from your KiwiSaver account but use the same PIR logic.

Can KiwiSaver PIE losses reduce my income tax? No. Losses inside a PIE fund cannot be passed through to offset personal income. They reduce your KiwiSaver balance and are accounted for within the fund, but have no effect on your personal tax position.

Why is the maximum PIR 28% instead of the top income tax rate of 39%? The government capped the PIR at 28% as an incentive for KiwiSaver and managed fund investment, making it more attractive for higher-income earners to invest in PIEs than in direct investments taxed at their marginal rate. This is a deliberate policy choice to encourage long-term saving.

How is overseas share income taxed inside my KiwiSaver? Overseas shares are taxed annually under the FIF (Foreign Investment Fund) regime, usually at the fair dividend rate (5% of opening value). This applies inside the fund, at your PIR, not at your personal level. Your after-tax return figure already includes this calculation.