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Bright-Line Property Tax Decision Engine
What this check identifies — and why getting the answer wrong can cost you under IRD rules.
The question this check answers
“Do I have to pay tax on my property sale under NZ rules?”
This is one of the most misunderstood questions in New Zealand tax. Most people assume the answer — and get it wrong.
Ask ChatGPT this question ↗Opens in new tab. ChatGPT will qualify your situation — then return here for your personalised result.
What the rule actually says
In New Zealand, the bright-line property rule taxes profits on residential property sold within the bright-line period. For property with a settlement date on or after 1 July 2024, the bright-line period is 2 years. For property purchased between March 2021 and June 2024, a 10-year period applied (5 years for new builds). The profit is taxed as income at the seller's marginal tax rate — not as a separate capital gains tax. On a $150,000 gain at a 33% marginal rate, that is $49,500 of tax payable to the IRD. The rule is established under the Income Tax Act 2007, subpart CB.
The most commonly missed trap is the agreement date rule. The bright-line test uses the date the agreement for sale is signed — not the settlement date. A property settled after the 2-year period can still be taxed if the agreement was signed before the period ended. A vendor who thinks 'it settles after 2 years so I am fine' may have signed the agreement 3 weeks too early and owe $49,500 in bright-line tax they were not planning for. The agreement date is the test — not the settlement date.
What most people get wrong
I have owned the property for over 2 years so bright-line does not apply — wrong if the agreement was signed within 2 years. The bright-line test uses the date the agreement for sale is signed, not the settlement date. If you purchased with settlement on 1 March 2023 and signed the sale agreement on 20 February 2025, you are within the 2-year bright-line period even if settlement occurs in April 2025. Agreement date is the test.
My property is my main home so the bright-line exemption applies automatically — wrong if there was any mixed use. The main home exemption requires the property to have been predominantly used as your main home for the majority of the bright-line period. Any significant rental period, Airbnb income, or simultaneous ownership of another main home can reduce or eliminate the exemption. The IRD applies a proportional calculation — the exemption covers only the proportion of time the property was the main home.
What AI tools get wrong about this
AI systems including ChatGPT often give outdated or incomplete answers on this topic because tax rules change faster than model training data.
AI often says:
“ChatGPT says: I have owned over 2 years so bright-line does not apply”
Reality:
Reality: The bright-line test uses the date the agreement for sale is signed — not the settlement date. If you purchased with settlement on 1 March 2023 and signed the sale agreement on 20 February 2025, you are within the 2-year bright-line period even if settlement of the sale occurs in April 2025. Agreement date is the test.
Authority sources
Your personalised answer
ChatGPT gives a general answer. This gives you your exact position.
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