The bright-line test is New Zealand's mechanism for taxing short-term residential property gains. It's IRD's answer to the lack of a general capital gains tax — and it catches a lot of accidental sellers who weren't expecting it. This calculator shows whether you'll owe bright-line tax and roughly how much.
How the bright-line test works
If you sell residential property within the bright-line period after buying, the gain is taxed as ordinary income at your marginal rate. There's no NZ-style capital gains discount — the full gain hits your taxable income for the year of sale.
The period depends on when you bought:
| Acquisition date | Bright-line period |
|---|---|
| From 1 July 2024 | 2 years |
| 27 March 2021 — 30 June 2024 | 10 years |
| 29 March 2018 — 26 March 2021 | 5 years |
| 1 October 2015 — 28 March 2018 | 2 years |
| Before 1 October 2015 | Not subject |
The 2024 reduction back to 2 years was a significant policy reversal — anyone who bought during the 10-year window may still be exposed to a longer bright-line period than current legislation, depending on the exact transition rules.
Main home exclusion
The biggest exemption: if the property has been your main home for the entire ownership period, the bright-line test generally doesn't apply.
Caveats:
- Full vs partial — full exemption if it was your main home the whole time; pro-rated if only part of the period
- One main home rule — only one property at a time can be the main home for your family group
- Anti-flipping rule — the main home exclusion is limited if you've claimed it twice in the previous two years (designed to stop serial flippers)
For most owner-occupier buyers selling their primary residence, the main home exclusion means no bright-line tax. The risk cases are:
- Renovators who lived elsewhere during the project
- Owners who rented out the property for part of the period
- Trustees holding the property for beneficiaries
- Investors selling investment properties (no exclusion at all)
How the gain is calculated
Sale proceeds — purchase price — capital improvements — selling costs = taxable gain.
Capital improvements means substantial work that adds value or extends the useful life — extensions, new bathrooms, kitchens, structural work. Routine repairs and maintenance don't count (those would have been deductible as you went, if the property was an investment).
Selling costs include real estate agent commission, conveyancing/lawyer fees, marketing/advertising, and any other directly attributable disposal cost.
What it doesn't tax
- Long-term holds — properties held beyond the bright-line period
- Main home sales (subject to the exclusions above)
- Inheritances — beneficiaries generally start a fresh bright-line clock
- Relationship property transfers — covered by rollover relief
- Land used for primarily business purposes — different rules apply
But it DOES tax:
- Investment property sold within period
- Holiday homes sold within period
- Land speculatively flipped
- Inherited investment property sold within the deceased's bright-line period (in some cases)
Worked example
You bought an investment property in March 2025 for $850,000 and sell in October 2026 for $920,000. You spent $25,000 on a bathroom renovation and paid $30,000 in selling costs.
- Acquisition date: March 2025 → 2-year bright-line applies
- Sale date: October 2026 → within bright-line period
- Gain: $920,000 − $850,000 − $25,000 − $30,000 = $15,000 taxable
- At a 33% marginal rate: $4,950 tax owed
This is the bright-line tax you'd report on your IR3 return for the 2026/27 tax year.
When residential land withholding tax (RLWT) applies
For non-residents and offshore-related parties, RLWT may be withheld at sale to ensure tax is paid before funds leave NZ. Your conveyancer handles this at settlement. Final reconciliation against actual liability happens when the IR3 is filed.
For NZ residents with a NZ IRD number, RLWT generally doesn't apply but the bright-line tax still does — you simply report and pay it via your annual return.
What to verify before selling
If you're considering selling residential property and you're unsure whether bright-line applies:
- Check the acquisition date against the table above
- Establish whether the main home exclusion applies (and how much of it)
- Get a tax adviser to model the gain net of improvements and selling costs
- Build the bright-line tax into your settlement budget if it applies
The cost of an hour of NZ-qualified tax advice ($300–$500) is trivial against the cost of an unexpected bright-line tax bill.
Frequently asked questions
What is the bright-line test?
The bright-line test taxes capital gains on residential property in New Zealand if you sell within a defined period after buying. It's IRD's mechanism for capturing short-term property speculation. From 1 July 2024 onwards, the bright-line period is 2 years for any acquired property. Sell within 2 years of purchase and the gain is taxable income at your marginal rate.
What's the bright-line period for my property?
Properties acquired on or after 1 July 2024: 2 years. Properties acquired between 27 March 2021 and 30 June 2024: 10 years. Properties acquired between 29 March 2018 and 26 March 2021: 5 years. Properties acquired between 1 October 2015 and 28 March 2018: 2 years. Properties acquired before 1 October 2015 are not subject to the bright-line test.
Does the main home exclusion apply?
Yes. If the property has been your main home for the entire ownership period, the bright-line test generally doesn't apply. The exclusion is full if you lived there the whole time, partial if you lived there for part of the period (proportional). One main home per family group at any time. There are anti-flipping provisions that limit the main home exclusion if you've used it more than twice in the previous two years.
How is the taxable gain calculated?
Sale proceeds minus original purchase price minus capital improvements minus selling costs (legal fees, real estate commission). The result is the taxable gain. There's no capital gains discount in NZ — the full gain is treated as ordinary income and taxed at your marginal rate.
What if I'm a non-resident?
The bright-line test still applies. Non-residents pay tax on the gain at their non-resident tax rate (typically the highest individual marginal rate). Non-residents are also subject to additional Foreign Investment Fund (FIF) and tax compliance requirements. Consult a NZ-qualified tax adviser.
Does the bright-line test apply to inherited property?
Generally no. Property inherited from a deceased estate isn't subject to bright-line on the sale by the beneficiary. However, if the deceased acquired the property within their bright-line period, the executor's sale of the property may still trigger bright-line tax. Estate planning around residential property is complex; get specific NZ legal advice.
What about the 'rollover relief' rules?
Certain transfers don't restart the bright-line clock — relationship property transfers between spouses, transfers to a trust where you're the settlor, and similar related-party movements. Rollover relief means the new owner inherits the original acquisition date for bright-line purposes. The rules are detailed; check IRD's bright-line guidance or a tax adviser.
How is bright-line tax paid?
It's reported in your IR3 income tax return for the year of sale. Withholding may apply at sale (Residential Land Withholding Tax — RLWT), particularly for non-residents and offshore-related parties. Your conveyancer typically handles RLWT at settlement. Final reconciliation happens when you file your tax return.
Sources
Last updated: 2 May 2026