NZ Property Tax Calculator — Bright-line + Interest Deductibility
See the full tax picture for your NZ residential property in one flow: the capital-gain-on-sale bright-line test and the ongoing rental tax (with interest deductibility %, ring-fencing, and marginal rate). Covers the 1 July 2024 reform (bright-line cut to 2 years for all sales) and the full restoration of interest deductibility from 2025-26.
A property qualifies as a new build if its Code Compliance Certificate was issued on or after 27 March 2020, or acquired off-plan from a developer who received the CCC on/after that date.
Expenses: rates, insurance, repairs, property management, body corporate, advertising. Depreciation is not deductible on residential buildings.
The three regimes, in one place
1. Bright-line test — NZ's de-facto capital-gains tax on residential property. Under the Taxation (Bright-line Test) Amendment Act 2024, all sales on or after 1 July 2024 use a 2-year bright-line period regardless of when you purchased. Main home exemption applies if you used the property >50% as your main home for >50% of ownership.
2. Interest deductibility — phased OUT 2021–2025 by Labour, then REVERSED by the coalition govt. Schedule now: 2023-24: 50%, 2024-25: 80%, 2025-26: 100% (fully restored), 2026-27+: 100%. New builds with CCC on/after 27 March 2020 had 100% throughout.
3. Ring-fencing of rental losses — since 2019-20 (s EL 1–20 Income Tax Act 2007), residential rental losses can't offset salary or other income. They carry forward against future rental income only.
Frequently asked questions
What changed on 1 July 2024?
The bright-line period was cut to 2 years for all residential property sales completed on or after 1 July 2024, regardless of when the property was purchased. This retroactively benefits long-term holders who previously faced the 5-year or 10-year tests — if you've held for 2+ years and sell from 1 July 2024 onwards, bright-line does not apply.
Is rental interest fully deductible again?
Yes, from the 2025-26 tax year onwards, 100% of interest on loans secured against residential rental property is deductible. The coalition government's phase-in went 50% (2023-24) → 80% (2024-25) → 100% (2025-26+), reversing Labour's phase-out to zero.
What counts as a new build?
A property whose Code Compliance Certificate (CCC) was issued on or after 27 March 2020, or one acquired off-plan from a developer who received the CCC on/after that date. New builds received 100% interest deductibility during the phase-out years — this carve-out is now irrelevant from 2025-26 because all residential interest is 100% deductible.
How does the main home exemption work?
The main home exemption from bright-line applies if the property was used as your main home for more than 50% of the time you owned it AND more than 50% of the area was used as your main home. Extended absences over 12 months or converting to a rental can disqualify the exemption for parts of the ownership period.
What is ring-fencing of rental losses?
Since 2019-20, deductions from residential rental property are 'ring-fenced' — if they exceed rental income for the year, the excess cannot offset your salary, business income, or other income. It carries forward to offset future residential rental income only.
Bright-line vs general property-trading rules — what's the difference?
Bright-line (s CB 6A) is a black-and-white time-based rule. General property-trading rules (ss CB 6–CB 14) tax gains where the property was acquired with a purpose of resale, by a dealer/developer/builder, or as part of a pattern of trading. Those tests can still tax gains outside the bright-line period and are outside the scope of this calculator.
Does this tool cover foreign-owner withholding?
No. If you are a non-resident, Residential Land Withholding Tax (RLWT) may be deducted at settlement, and NRWT may apply to rental payments. This calculator estimates income-tax treatment only — discuss withholding with your conveyancer and tax agent.
Sources
Bright-line rules: IRD — Bright-line Property Rule and Taxation (Bright-line Test) Amendment Act 2024. Interest limitation rules: IRD — Interest Limitation. Ring-fencing: IRD — Residential Rental Income.
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Last updated April 2026. Rates and rules sourced from IRD. Estimate only — confirm final figures with your tax agent.