NZ Brightline Test Calculator 2026

What Is the Brightline Test in New Zealand?

The brightline test is New Zealand's targeted property income tax rule, administered by Inland Revenue (IRD). It taxes gains from selling residential property if the property is sold within a set "brightline period" from the date of purchase. Unlike a broad capital gains tax, the brightline test applies only to residential land and property — commercial property, farmland, and business assets are outside its scope.

The test was first introduced in October 2015 with a 2-year period, then extended to 5 years in 2018, 10 years in 2021, and reduced back to 2 years from 1 July 2024 under the National-led government. As of 2026, any residential property purchased on or after 1 July 2024 and sold within 2 years is subject to the brightline test. Last updated: May 2026. Based on IRD brightline test guidance.

Which Brightline Period Applies to Your Property?

The correct brightline period depends on when you purchased the property:

• Purchased on or after 1 July 2024: 2-year brightline period applies to all residential property — both new builds and existing homes.
• Purchased between 27 March 2021 and 30 June 2024: New builds had a 2-year period. All other residential property had the 10-year period.
• Purchased between 29 March 2018 and 26 March 2021: A 5-year brightline period applied.
• Purchased between 1 October 2015 and 28 March 2018: The original 2-year period applied.
• Purchased before 1 October 2015: The brightline test does not apply at all.

This calculator automatically selects the correct period based on your purchase date and property type, reflecting the 2024 changes as confirmed by IRD.

Brightline Test Exemptions — Main Home and Inherited Property

Several important exemptions mean many property sales are not subject to brightline tax:

• Main home exemption: Your primary residence is generally exempt. IRD looks at whether the property was mainly used as your home for most of the brightline period. If you rented it out for more than a brief period, claimed deductible expenses, or moved frequently between homes, you may only receive a partial exemption.
• Inherited property: Property received through a deceased estate is fully exempt from the brightline test regardless of holding period or sale price.
• Relationship property transfers: Transfers of property between spouses or de facto partners under the Property (Relationships) Act 1976 are also exempt.
• Business premises: Properties used mainly for business purposes (e.g., a home office used exclusively for commercial activity) may have reduced exposure, but seek professional advice.

How Brightline Tax Is Calculated

When the brightline test applies, IRD treats the gain as taxable income in the year of sale. The calculation follows these steps:

1. Calculate the gain: sale price minus purchase price minus allowable selling costs (agent commissions, legal fees, conveyancing).
2. Add the gain to your other income for that tax year (salary, rental income, self-employment, etc.).
3. Apply NZ progressive income tax rates to the combined total.
4. Your brightline tax equals the additional tax caused by adding the gain to your income.

The 2026 IRD tax brackets are: 10.5% on the first $14,000, 17.5% on $14,001–$48,000, 30% on $48,001–$70,000, 33% on $70,001–$180,000, and 39% on income over $180,000. Because the gain is stacked on top of your regular income, it is often taxed at a higher marginal rate than your salary alone — this calculator models the stacking effect accurately.