NZ Bright-Line Test Calculator 2026

This calculator works out whether the bright-line test applies to a residential property sale and estimates the tax you would owe if it does. The test taxes gains on property sold within a set number of years of purchase, and the version that applies depends on your dates: 2 years for sales from 1 July 2024, with earlier sales falling under the 5-year or 10-year rules, which the tool works out automatically. You enter your purchase and sale dates, purchase and expected sale price, property type, whether it was your main home for all, part, or none of the ownership period, any capital improvements, and your other annual income for a marginal rate estimate. It returns your ownership period, the applicable bright-line rule and end date, whether the test applies, the taxable and exempt portions of the gain under the main home exclusion, your estimated marginal tax rate, and the estimated income tax owed and net after-tax gain. If you still hold the property, it also shows how long until the bright-line period ends. Farmland and commercial property are flagged as generally exempt. This is an indicative estimate only, not tax advice, and your actual liability depends on your full circumstances, so confirm your position with a tax professional or accountant before filing your return.

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Updated  Current rates and legislation applied.

NZ Bright-Line Test History

The bright-line test has changed several times since it was introduced in 2015. The rule that applied to any given sale depended on when the property was acquired and when it was sold. For sales on or after 1 July 2024, the current 2-year rule applies to all residential property regardless of when it was purchased.

Main Home Exclusion

The most important exemption to the bright-line test is the main home exclusion. If the property was your main home for the entire period you owned it, the bright-line test does not apply regardless of how long you owned the property for. Your main home is the property where you primarily live - you can only have one main home at a time.

If the property was your main home for only part of the ownership period (for example, you rented it out for a year before selling), the bright-line test applies to the portion of the gain that relates to the non-main-home period. This is called the change of use rule. The taxable portion is calculated proportionally based on the time the property was not your main home as a percentage of the total ownership period.

How the Tax is Calculated

Any gain subject to the bright-line test is treated as income in the year of sale and taxed at your marginal income tax rate. It is added on top of your other income for that year, which may push you into a higher tax bracket. The gain must be included in your individual tax return (IR3) for the year in which you disposed of the property.

The taxable gain is generally the difference between what you sold the property for and what you paid for it (your cost base). You can also include certain costs in your cost base such as legal and valuation fees paid on acquisition, and any capital improvements made to the property that were not already claimed as a deduction. Selling costs such as real estate agent commission can be deducted from the sale proceeds.

Farmland and Commercial Property

The bright-line test applies to residential land only. Farmland and commercial property are generally not subject to the bright-line test. However, other provisions of New Zealand tax law may apply to gains on these properties, particularly if they were purchased with an intention of resale (the intention test). If you are selling farmland or commercial property, you should seek specific tax advice.

New Builds

Under the rules that applied between March 2021 and June 2024, new builds were subject to a 5-year bright-line period rather than the 10-year rule that applied to existing residential properties. From 1 July 2024, this distinction no longer matters as the rule is uniformly 2 years for all properties.