Free Bright-Line Test Calculator for New Zealanders
The bright-line test taxes residential property sales inside a fixed window. From 1 July 2024 the window is 2 years for all residential property; older sales used 5-year or 10-year rules. Main home, inheritance, and rollover transfers are excluded.
Your dates
Held for 1,036 days, sold under a 2-year window.
About our Bright-Line Test Calculator
The bright-line testBright-line testNZ rule taxing the gain on residential property sold within 2 years (10 for some pre-2024 sales).View in glossary → turns a residential property gain into ordinary income for tax purposes if the property is sold inside a fixed holding window. From 1 July 2024 the window is 2 years for any residential property, regardless of whether it is a new build, regardless of when it was originally bought.
The calculator measures the holding period from the bright-line start date (typically settlement) to the sale date and tells you whether the test applies. If it does, the gain is added to your other income for the year and taxed at your marginal rates. If it does not, the gain is generally tax-free, unless a separate property-tax rule (intent to resell, land dealer, land developer) catches it.
Three big exclusions apply: main home (where the property has been your main residence for more than 50% of the holding period), inheritance, and certain rollover transfers (e.g., between spouses or into a family trust).
How to use it
Enter the bright-line start date (usually the day legal title transferred to you on settlement) and the sale date (the day you signed an unconditional contract to sell).
The calculator returns the holding period in days and years, the relevant bright-line window for that pair of dates (2 years for sales on or after 1 July 2024, 5 or 10 years for older sales depending on type), and whether the test applies to your situation.
For complex situations (mixed-use property, partial main-home use, inheritance, family-trust transfers), the calculator’s simple result is a starting point. The IRD bright-line guide IR1229 covers the edge cases, and a chartered accountant can confirm the actual treatment.
Why use it
The single most common bright-line question is "have I held this property long enough that selling now is tax-free?" The calculator answers it directly.
For property currently inside the window, the calculator also surfaces the date at which the bright-line falls away. Holding for an extra month or two to clear the window can save tens of thousands of dollars in tax on a typical NZ residential gain. Whether to wait is a personal decision based on the market, holding costs, and other circumstances; the calculator just shows the numbers.
For property bought before 1 July 2024 and being considered for sale, the calculator also handles the older 10-year and 5-year rules. The 2024 change applies to sale date, not purchase date, so any sale today (May 2026) uses the 2-year rule, even for property bought in 2019 under the old 5-year regime.
The maths behind it
Days held = Sale date − Bright-line start date | Test applies if days held < 730 (post-1-July-2024 sales) The bright-line start date is usually the date legal title transfers to the buyer (settlement). The end date is the date you enter into a contract to sell. For sales on or after 1 July 2024, the test applies if the gap between the two is less than 2 years (730 days). For sales before 1 July 2024, the longer 5- or 10-year windows applied based on whether the property was a new build and when it was acquired. The calculator handles both windows so older sales can also be checked.
Worked example
Frances, Wanaka, sold a Cromwell rental in March 2026 after holding for 18 months.
Frances bought a $620,000 rental in Cromwell in September 2024 and sold it in March 2026 for $735,000. Holding period: 547 days, well under the 730-day (2-year) bright-line window.
The bright-line test applies. Her gain of $115,000 (sale price minus purchase price minus selling costs of around $25,000) is taxable as ordinary income, added to her other income for the year.
Frances’s other income is $96,000 from her main job. The $115,000 gain pushes her into the 33% and 39% brackets. Tax on the gain (at her marginal rates) lands around $38,500, leaving net proceeds after tax of $76,500 from the sale.
If Frances had held the property until October 2026 (just over 2 years), the bright-line test would not have applied, and the gain would have been entirely tax-free unless a different property tax rule (e.g., the IRD’s “intent to resell” rule, which sits outside the bright-line) caught it.
Things to keep in mind
- Main home is excluded. A property that has been your main home for more than 50% of the bright-line period is excluded from the test. The exclusion has nuances around partial main-home periods, time you have rented part of it, and longer absences for work.
- Inherited property is excluded. Property received through inheritance or a relationship-property settlement is generally outside the bright-line test, though the inheriting party takes over the original owner’s bright-line window in some cases (rollover relief).
- Other property tax rules apply on top. The bright-line test is one of several property-related tax rules. The "intent to resell" test (acquired-with-the-purpose-of-resale rule) can tax a gain even outside the bright-line window. The "land dealer" and "land developer" rules apply to property professionals. Get tax advice for any complex property transaction.
- Gain calculation requires careful records. The taxable gain is sale price minus all of: original purchase price, settlement legal fees, real-estate commission on the sale, qualifying capital improvements, and any costs of preparing the property for sale. Good records over the holding period make the gain calculation much simpler.
- Rollover relief in some transfers. Some transfers (between spouses, into a family trust, on relationship breakdown) do not reset the bright-line clock; the receiver inherits the original holder’s start date. The IRD’s rollover relief rules cover the specific cases.
NZ-specific notes
FAQs
Did the bright-line window change in July 2024?
Yes. From 1 July 2024 the window is 2 years for all residential property, regardless of whether it is a new build or existing. Before 1 July 2024, new builds had a 5-year window and standard properties had a 10-year window. The change applies to sales (not purchases) from 1 July 2024 onwards.
When does the bright-line start?
Usually the date legal title transfers to you, which is the settlement date on a standard purchase. For new-build off-the-plans purchases, it can be the date you sign the agreement, depending on the timing. For inherited or transferred property under rollover relief, it is the original owner’s start date.
Is my main home exempt?
A property that has been your main home for MORE THAN 50% of the bright-line period is excluded from the test. If you lived in it for 18 months and rented it for 6 months over a 2-year hold, it qualifies as main home and the gain is tax-free. The 50% test is about the time period, not the dollar value.
Does the test apply to investment property only?
No. It applies to any residential property sold within the window unless an exclusion applies. The main home, inherited property, and certain rollover transfers are exclusions. Holiday homes used personally for more than half the period also typically qualify under the main home exclusion if formally treated as a residence.
How is the gain taxed?
The gain (sale price minus purchase price minus allowable costs) is added to your other income for the tax year and taxed at your marginal rates across the brackets. There is no separate "bright-line tax" rate; it is just income tax on the gain at whatever bracket(s) the additional income lands in.
Can I subtract improvements I made?
Yes, capital improvements (new kitchen, bathroom renovation, deck construction, structural additions) reduce the taxable gain. Repairs and maintenance (painting, replacing carpets, fixing leaks) generally do not, because they are operating expenses rather than capital improvements. The IRD guide IR1229 has specific examples.
What about commercial property?
The bright-line test applies to residential property only. Commercial property, mixed-use buildings, and farms have their own tax rules around capital gains, with the "intent to resell" test as the main equivalent. The bright-line calculator is residential-only.
What if I sold just before 1 July 2024?
Pre-1-July-2024 sales used the older windows: 10 years for residential property bought after 27 March 2021, 5 years for new builds, 5 years for property bought between 29 March 2018 and 27 March 2021. The calculator handles these cases by detecting the sale date and applying the right window.
References & sources
- Inland Revenue, "The bright-line test". ird.govt.nz
- Inland Revenue, "Bright-line property tax guide IR1229". ird.govt.nz
- Inland Revenue, "Exclusions to the bright-line test". ird.govt.nz
- Inland Revenue, "Understand the property rules". ird.govt.nz