The Bright-Line Test in 2026: A Plain-English Guide for NZ Landlords

The bright-line test is one of the most misunderstood rules in NZ property tax. It's been changed so many times that even experienced landlords aren't sure which version applies to them. This guide cuts through the confusion.

What is the bright-line test?

In simple terms: if you sell a residential property within a certain number of years of buying it, any profit is taxed as income. It doesn't matter whether you intended to make a profit. If you sell inside the bright-line period, IRD treats the gain as taxable income at your marginal tax rate.

Your main home is usually exempt. But if you've rented the property out — even for part of the time — the test almost certainly applies.

Which bright-line period applies to your property?

The period depends on when you purchased the property. Here's the current state of play:

The purchase date that counts is the settlement date — when the title transferred — not the date you signed the sale and purchase agreement.

The 10-year trap

If you bought an existing property between 27 March 2021 and 30 June 2024, you're stuck with the 10-year bright-line period. Even though the government shortened it back to 2 years for new purchases from July 2024, that change wasn't retroactive.

That means a property you bought in April 2022 has a bright-line period that runs until April 2032. If you sell before then, you'll owe income tax on the profit.

For many landlords, this is the most important detail to get right. The difference between a 2-year and a 10-year period could mean tens of thousands of dollars in tax.

New builds get a shorter period

If you bought a new build between 27 March 2021 and 30 June 2024, your bright-line period is 5 years instead of 10. IRD defines a "new build" as a property with a code compliance certificate issued within the 12 months before settlement. This includes new houses, apartments, and townhouses — but not renovations of existing buildings.

How much tax would you actually pay?

The bright-line test doesn't have its own tax rate. Your profit gets added to your other income for the year and taxed at your marginal rate. For most landlords earning over $78,100, the marginal rate on this gain is 33%. Earn over $180,000 and the top rate is 39%.

Say you bought a rental for $650,000 and sold it for $850,000. That's a $200,000 gain. If your marginal rate is 33%, you'd owe around $66,000 in bright-line tax. That's a number worth knowing before you list.

The main home exclusion

If the property has been your main home for most of the time you owned it, you can usually exclude it from the bright-line test. But the rules are strict. You can only use this exclusion twice within any two-year period, and mixed-use situations (lived there for a while, then rented it out) require apportionment.

If you've rented the property out for the entire time, the main home exclusion won't help you.

Check your property now

Not sure where your property sits? Our Bright-Line Calculator takes your purchase date and tells you instantly whether you're inside or outside the bright-line period — and which version of the rules applies.