KiwiSaver funds are structured as PIE funds — Portfolio Investment Entities. This is a specific tax structure that affects how your investment returns are taxed, and in most cases it works in your favour. Understanding how PIE tax works helps you make better decisions about your KiwiSaver and other investments.
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.
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 $70,000 (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, the PIE cap of 28% represents an 11 percentage point saving 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:
- The fund earns investment income: dividends from shares, interest from bonds, realised capital gains from sold assets, and foreign investment income
- The fund calculates each member’s attributed income: your proportional share of the total fund income, based on your balance
- PIR tax is deducted: the fund applies your nominated PIR to your attributed income and deducts the tax
- After-tax returns are reported: your unit price and balance reflect the return after PIE tax
- 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.
Capital Gains Inside KiwiSaver
New Zealand does not have a general capital gains tax. However, KiwiSaver funds invest heavily in overseas shares, which are subject to the Foreign Investment Fund (FIF) regime. Under FIF rules, gains on overseas shares are taxed annually — even if unrealised — under the fair dividend rate (FDR) method (typically 5% of the opening value).
This happens inside the PIE fund, not at your personal level. You do not need to calculate or report FIF income personally — your KiwiSaver provider handles this. The after-fee, after-PIE-tax returns published by providers reflect FIF tax already deducted.
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.
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
PIE income from KiwiSaver is a final withholding tax. It does not need to be declared on your IR3 or auto-calculated personal tax summary. It appears in myIR as a separate item for information only — you owe nothing more.
Your PIR rate directly affects your take-home return
A member on 10.5% PIR effectively earns more from the same fund return than a member on 28% PIR. This is why checking your PIR is important — see our KiwiSaver PIR rate explained guide and how to update your PIR.
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.
PIE Funds 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 $70,001–$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 Member Tax Credit 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. PIE tax is a final withholding tax, deducted inside the fund. KiwiSaver investment income is not included in your personal tax return, and no additional tax is owed. It appears as information only in myIR.
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 PIE funds 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 at the fair dividend rate (typically 5% of opening value). This applies inside the fund, not at your personal level. Your after-tax return figure already includes this calculation.
What to Read Next
- KiwiSaver PIR Rate Explained — the three PIR rates and which one applies to you
- How to Update Your KiwiSaver PIR Rate — changing your nominated PIR with your provider
- KiwiSaver Fees Comparison — fees reduce your return before PIE tax even applies
- Best Performing KiwiSaver Funds NZ — performance returns are shown after PIE tax
- Is KiwiSaver Worth It? — assessing the full benefit picture including tax advantages
- What Is KiwiSaver? — the complete KiwiSaver overview