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Property Interest Deductibility Recovery Engine
What this check identifies — and why getting the answer wrong can cost you under IRD rules.
The question this check answers
“Can I still claim rental losses in New Zealand?”
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
New Zealand's mortgage interest deductibility for residential property investors was progressively removed by the previous government from 1 October 2021. The current government has restored it in two stages: 80% from 1 April 2024 and 100% from 1 April 2025. For investors with $20,000 of annual mortgage interest at a 33% marginal rate, full restoration means $6,600 of tax saving per year that was not available during the restriction period. This is not a new benefit — it is the return of an entitlement that was removed. The restoration is established under the Taxation (Annual Rates for 2023-24, Multinational Tax, and Remedial Matters) Act 2024.
The timing of any property sale decision now intersects with the deductibility restoration. An investor who sells before 1 April 2025 misses the final step to full deductibility. Combined with bright-line exposure if the property was purchased after July 2024, the cost of selling early has two components: lost future deductions and potential bright-line tax. The cashflow improvement from holding through April 2025 can be material — and it compounds annually from that date.
What most people get wrong
Interest deductibility was fully restored in 2024 — wrong. The restoration is staged. From 1 April 2024, 80% of mortgage interest on existing residential investment properties is deductible. Full 100% deductibility does not apply until 1 April 2025. For a property with $20,000 of annual interest, the difference between 80% and 100% is $660 per year at a 33% marginal rate — timing matters.
The interest restriction never affected new builds — correct, but often misunderstood in the opposite direction. New builds purchased after July 2020 retained full interest deductibility throughout the restriction period. Investors in new builds were never affected. The cashflow impact was entirely on existing residential investment properties. Investors holding both types may have different deductibility positions on each property.
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: Interest deductibility was fully restored in 2024”
Reality:
Reality: The restoration is staged. From 1 April 2024, 80% of mortgage interest on existing residential investment properties is deductible. Full 100% deductibility does not apply until 1 April 2025. For a property with $20,000 of annual interest, the difference between 80% and 100% is $660/year at 33% — timing matters.
Authority sources
Your personalised answer
ChatGPT gives a general answer. This gives you your exact position.
Free calculator. Takes 2 minutes. Built around IRD rules confirmed April 2026.
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