The Brightline Test in New Zealand: Property Tax Rules After 2025

From 1 July 2024, New Zealand’s brightline test reverted to two years — down from ten years under the previous government. Many property owners celebrated. But the rules around what counts as “two years,” which properties are exempt, and how interest deductibility works alongside the brightline test are far more complicated than the headline figure suggests. Sell the wrong property at the wrong time and the tax bill lands whether you expected it or not. Here is what you actually need to know.

What the Brightline Test Is — and Is Not

The brightline test is a rule in the Income Tax Act 2007 that taxes gains on the sale of residential land acquired and sold within a set period. If you buy a residential property and sell it within the brightline period, the profit is taxable income — regardless of whether you intended to make a profit.

What it is not: a capital gains tax. New Zealand does not have a general capital gains tax. The brightline test is a targeted rule that applies to a defined category of transactions. Properties held longer than the brightline period, or covered by an exemption, are not subject to tax on sale under this rule (though other tax rules — such as the trader provisions — may still apply).

The brightline test sits alongside other property tax rules in subpart CB of the Income Tax Act 2007, some of which have existed for decades. If a property is caught by any of those other rules — for example, because it was acquired with the intention of resale — it may be taxable regardless of the brightline period. The brightline test does not override those rules; it adds an additional, clearer bright line.

How the Rules Changed: 2015 to 2026

How the Two-Year Period Is Calculated

The brightline period runs from the date of acquisition to the date of disposal. But what counts as the acquisition and disposal dates is not always the date you sign the sale and purchase agreement.

Under the Income Tax Act 2007 and associated regulations:

• Acquisition date: The date the person acquires the land — generally the date the title transfers to the buyer (i.e., settlement date), not the date of signing the agreement. However, for properties acquired off the plans, specific rules apply.
• Disposal date: The date of settlement (transfer of title), not the date of signing the sale agreement.

Example: You settle on a property on 15 August 2024. You settle its sale on 10 August 2026. That is 1 year and 360 days — just inside the 2-year brightline window. The gain is taxable. Had you waited until 16 August 2026 or later, it would not be.

Key Exemptions: When No Tax Is Owed

1. The Main Home Exemption

The most important exemption. If the property was your main home — your primary residence — for the entire brightline period, no tax is owed on sale. However, if the property was rented out for any part of the brightline period, the exemption applies proportionately. The gain is apportioned between the period it was used as a main home (exempt) and any period it was not (taxable).

There is a specific anti-avoidance rule for frequent movers. If you have used the main home exemption more than once in a 2-year period, Inland Revenue may treat subsequent sales with scepticism. This does not automatically make the later sale taxable, but it increases scrutiny.

2. Inherited Property

Property inherited from a deceased estate is generally not subject to the brightline test when sold by the beneficiary — provided it was transferred to them as part of the estate rather than purchased. The estate itself may have brightline obligations if it holds and sells the property, but the beneficiary who receives and on-sells inherited property under normal circumstances is exempt.

3. Relationship Property Transfers

Transfers of property between partners under the Property (Relationships) Act 1976 — such as following separation — are generally not subject to the brightline test. The brightline does not apply to transfers ordered or agreed under the relationship property regime.

4. Business Premises

Commercial property and business premises are not residential land for brightline purposes, though other tax rules may apply to gains on their sale. The brightline applies specifically to residential land.

Interest Deductibility Restored: What Landlords Need to Know

Separate from the brightline test but closely related in practice: the restoration of interest deductibility for residential rental properties. This is a major change for property investors.

From 1 October 2021, the previous government phased out the ability to deduct mortgage interest on residential rental properties from taxable rental income. By 31 March 2023, interest deductibility was entirely removed for most existing properties (new builds retained deductibility).

The current government has been restoring deductibility in stages:

From 1 April 2025, landlords can once again deduct 100% of their mortgage interest on residential rental properties from their rental income when calculating tax. This is a significant financial change for property investors who had been paying materially higher tax during the restriction period.

New Builds and the Brightline Test

New builds receive different treatment. A “new build” for brightline purposes is a residential property that has received a code compliance certificate (CCC) issued on or after 27 March 2020 for the addition of a new self-contained residence. The brightline period for properties that qualify as new builds at acquisition has historically been shorter — 5 years even when the general brightline period was 10 years.

Under the current 2-year regime (from 1 July 2024), new builds and existing properties both sit within a 2-year brightline — the distinction matters less than before. However, new builds may still have advantages in other areas, such as interest deductibility (which was maintained throughout for new builds even when existing properties lost it).

Inherited Property and the Brightline Test

The estate of a deceased person and the beneficiary who receives property from it are treated differently under the brightline rules.

When a person dies and their property passes to their estate, the estate’s administrator holds the property until it is distributed to beneficiaries. The estate is generally treated as having acquired the property at the date of death. If the estate then sells the property within 2 years of acquisition, brightline tax may apply to the estate — unless the main home exemption or another exemption applies.

Once a beneficiary receives the property from the estate, their acquisition date for brightline purposes is the date the property is transferred to them — not the original deceased’s purchase date. If the beneficiary then sells the property, the 2-year clock runs from the date of transfer from the estate to them.

How Brightline Tax Is Calculated

Brightline tax is income tax. The gain on the property sale is added to your other income for the year and taxed at your marginal tax rate. New Zealand’s personal income tax rates as at 2026:

The taxable gain is the sale price minus the cost of the property (purchase price plus acquisition costs) and any allowable deductions. This is not as simple as: sale price minus purchase price. Allowable deductions may include legal fees, valuation costs, and capital improvements — but not normal maintenance. Inland Revenue’s guidance on deductible costs under the brightline rules should be confirmed with a tax adviser for your specific situation.

Example: You earn $90,000 per year from your job and sell a rental property for a brightline gain of $80,000. That $80,000 is added to your $90,000 income. Your total income is $170,000 — taxed at 33% on the amounts above $70,001. The brightline gain alone could cost you $26,400 in income tax (at 33% on the full $80,000 if you are above $70,000 already). The exact figure depends on your full income for the year and any offsets available.

Frequently Asked Questions

The Part Nobody Talks About

The headline from 2024 was simple: brightline goes back to 2 years. But the deeper story is more interesting. For the thousands of investors and home owners who bought between March 2021 and June 2024, the 10-year rules still apply. Those properties will remain inside the brightline window until 2031, at the earliest, for properties acquired in that period.

Meanwhile, the restoration of interest deductibility is quietly changing the economics of holding rental property more than the brightline reduction did for many investors. A landlord with $1 million of mortgage debt at 7% interest has $70,000 in annual interest costs. Being able to deduct that in full against rental income — as was possible before 2021 and is again from April 2025 — is worth tens of thousands of dollars a year in real after-tax terms. That is a structural change in investment returns that is already beginning to affect decisions about holding, developing, and selling rental property across New Zealand.

Sources and Legislation

• Income Tax Act 2007 (subpart CB, ss CB 6A–CB 16A) — New Zealand Legislation
• Brightline property rule — Inland Revenue Department (ird.govt.nz)
• Interest limitation rules — Inland Revenue Department
• Main home exemption — Inland Revenue Department