Bright-Line Test Explained: NZ Property Tax Rules (2025-26)

New Zealand is often said to have no capital gains tax — and for most assets, that’s true. But for residential property, there is a tax on gains from sales that happen within a certain timeframe of purchase. This is the bright-line property test, and understanding it is essential for anyone buying, selling, or investing in property in New Zealand.

What Is the Bright-Line Test?

The bright-line test is a rule that taxes profits from selling residential property if the property is sold within a specified period of acquiring it. It was designed to target short-term property speculation without introducing a broader capital gains tax.

The test creates a clear (“bright”) line: if you sell within the defined period, you pay income tax on the profit. If you sell outside that period, no tax applies under the bright-line rules (though other income tax rules may still apply in certain circumstances).

The Current Rule: 2-Year Period (from July 2024)

The bright-line period has changed multiple times since the test was introduced in 2015:

Period	Bright-Line Duration	Government
Before Oct 2015	No bright-line test	N/A
1 Oct 2015 – 28 Mar 2018	2 years	National
29 Mar 2018 – 26 Mar 2021	5 years	Labour-NZ First
27 Mar 2021 – 30 Jun 2024	10 years (new builds: 5 years)	Labour
From 1 July 2024 onwards	2 years	National-ACT-NZ First

For properties acquired on or after 1 July 2024, the bright-line period is 2 years. This means if you buy a property on or after 1 July 2024 and sell it within two years of the acquisition date, the gain is taxable.

For properties acquired before 1 July 2024, the previous rules still apply based on when they were acquired — see Transitional Rules below.

How Is the Acquisition Date Determined?

The bright-line period starts from the date you acquired the property. For most purchases, this is the date the title transfers (settlement date), not the date you signed the sale and purchase agreement.

If you’re buying off the plans or a new build, the acquisition date is typically when the title to the land is first transferred to you.

How Is the Gain Calculated?

If the bright-line test applies, you include the taxable gain in your income for the year and pay income tax on it at your marginal rate.

The gain is calculated as:

Taxable gain = Sale price − Cost base

The cost base includes:

• The purchase price of the property
• Legal fees and purchase costs
• Capital improvements made to the property (renovations, extensions, etc.)
• Real estate agent commissions on sale
• Legal fees on sale

Ordinary maintenance and repairs are not included in the cost base — these are revenue expenses, not capital improvements.

Note: Unlike in some countries, there is no discount for the length of time you held the property. The full gain is taxable regardless of whether you held the property for 6 months or 23 months.

Worked Example

Sarah buys a rental property in October 2024 for $680,000 and sells in September 2026 for $780,000 (23 months later).

Costs:

• Purchase price: $680,000
• Purchase legal fees: $2,500
• Renovation (new deck and paint): $18,000
• Sale legal fees: $2,000
• Agent commission: $14,000

Cost base = $680,000 + $2,500 + $18,000 + $2,000 + $14,000 = $716,500

Taxable gain = $780,000 − $716,500 = $63,500

Since Sarah is 23 months into ownership (within the 2-year period), the gain is subject to the bright-line test. The $63,500 is added to her other income and taxed at her marginal rate.

If Sarah earns $90,000 from employment, her total income is $153,500. The $63,500 gain would be taxed at 33% (income between $78,101–$180,000):

Tax on bright-line gain ≈ $63,500 × 33% = $20,955

If Sarah had waited until October 2026 (25 months), the sale would be outside the 2-year window and the gain would not be taxed under the bright-line rules.

Main Home Exemption

The main home exemption is the most important exemption from the bright-line test. If the property being sold is your main home, the gain is not subject to the bright-line test — regardless of how long you’ve owned it.

What qualifies as your main home:

• The property must be your principal place of residence — the home where you predominantly live
• You must have lived there for the majority of the time you owned the property (during the bright-line period)

Important limitations:

• The exemption applies to the main home portion only. If you rented out part of the house (e.g., a sleepout or a bedroom on Airbnb), the income-earning portion of the property does not qualify for the exemption, and a proportional gain may be taxable.
• You can only have one main home at a time
• If you’ve used the main home exemption within the previous 2 years, you may not be eligible again

If a property qualifies as your main home for the full period of ownership, no bright-line tax applies. If it was your main home for only part of the period, only the gain attributable to the non-main-home period is taxable.

Inheritance Exemption

Property received as an inheritance (bequest under a will) is excluded from the bright-line test. If you inherit a property and sell it within 2 years, you don’t pay bright-line tax.

However, if you then sell the property within 2 years and your intent was to profit from property speculation, IRD’s general anti-avoidance provisions may still apply.

Other Exemptions

Relationship property settlements: Property transferred to a spouse or partner as part of a relationship property settlement is generally not subject to the bright-line test at the time of transfer. However, the bright-line clock doesn’t reset — the original acquisition date carries over.

Company amalgamations and certain business restructures: Some corporate transactions have specific exemptions.

Land outside NZ: The bright-line test applies only to residential land in New Zealand.

Transitional Rules

The bright-line period that applies depends on when you acquired the property, not when you sell it:

• Acquired before 29 March 2018 → the 2-year rule applies
• Acquired 29 March 2018 – 26 March 2021 → the 5-year rule applies
• Acquired 27 March 2021 – 30 June 2024 → the 10-year rule applies (5 years for new builds)
• Acquired from 1 July 2024 → the 2-year rule applies

This means some properties acquired during 2021–2024 are still subject to the longer bright-line periods even though the current law has reverted to 2 years.

Rollover Relief

In some circumstances, the bright-line rules include rollover relief — where the gain is deferred rather than triggered immediately:

• Transfers between associated persons in certain circumstances
• Transfers to or from a look-through company or partnership where ownership doesn’t change substantively

If rollover relief applies, the original acquisition date carries over to the new owner for bright-line purposes.

Declaring Bright-Line Income

If your sale falls within the bright-line period and no exemption applies, you must declare the gain in your income tax return (IR3) for the year of sale. IRD has data-sharing arrangements with Land Information New Zealand (LINZ) and real estate agents, so they often already know about property sales. Failing to declare taxable gains can result in assessments, penalties, and use-of-money interest.

If you’re unsure whether a sale is taxable, consult a tax adviser before completing your return.

Record Keeping

Even if you think the bright-line test won’t apply, keep records of purchase prices, improvement costs, and all property-related expenses. IRD can request these records, and having accurate documentation avoids disputes.

Summary

• Bright-line period is 2 years for properties acquired from 1 July 2024
• Profit from selling within 2 years is added to your income and taxed at your marginal rate
• Main home exemption applies if it’s your principal residence for the full period
• Inheritance is exempt; relationship property transfers carry over the original acquisition date
• Gain = sale price minus cost base (purchase price + improvement costs + transaction costs)
• Declare bright-line income in your IR3 return for the year of sale

Use the Bright-Line Property Tax Calculator to estimate the tax on a potential property sale.