{"schema_version":"1.0","generated_by":"COLE — Citation Operations & Legal Engine","product_id":"interest-reinstatement-engine","title":"Property Interest Deductibility Recovery Engine","site":"https://taxchecknow.com/nz/check/interest-reinstatement-engine","authority":"Inland Revenue Department (IRD)","authority_url":"https://www.ird.govt.nz","jurisdiction":"New Zealand","language":"en-NZ","currency":"NZD","last_verified":"April 2026","legislation":"Income Tax Act 2007, section DB 2, as restored by the Taxation (Annual Rates for 2023-24, Multinational Tax, and Remedial Matters) Act 2024 — 80% from 1 April 2024, 100% from 1 April 2025","legal_anchor":"Income Tax Act 2007, section DB 2 — Interest Deductibility (restored)","deadline":{"iso_date":"2027-03-31T23:59:59.000+13:00","display":"31 March 2027","description":"NZ tax year end — interest deductions claimed in 2026/27 return","urgency_label":"TAX YEAR END"},"key_facts":{"current_deductibility_from_1_april_2025":"100%","prior_step_1_apr_2024_31_mar_2025":"80% deductible","restriction_period_1_oct_2021_31_mar_2024":"phased removal to 0% for most existing residential","new_builds_post_july_2020":"Never restricted — always 100%","commercial_property":"Never restricted — always deductible","legal_anchor":"Income Tax Act 2007, section DB 2","restoration_legislation":"Taxation (Annual Rates for 2023-24, Multinational Tax, and Remedial Matters) Act 2024","ownership_claim_location":"Individual (personal return) / Company (28%) / Trust (33%) / LTC (flow-through)","ring_fencing_rules_2019":"Still apply — rental losses cannot offset other income","audit_risk":"Loan tracing — purpose of borrowing determines deductibility, not security"},"formula":"Annual Tax Saving = Annual Mortgage Interest × Applicable Deductibility % × Effective Claim Rate. From 1 April 2025: 100% deductible. Individual ownership: effective rate = personal marginal (17.5/30/33/39%). Company: 28%. Trust: 33%. LTC: shareholder marginal. Example at 33% marginal on $20,000 interest: $20,000 × 100% × 33% = $6,600/year restored.","thresholds":[{"label":"Simple rental mortgage — single property, no refinancing","value":1,"status":"clear"},{"label":"Refinanced or topped up — not sure what is deductible","value":2,"status":"approaching"},{"label":"Mixed personal and rental debt on same loan","value":3,"status":"trap"},{"label":"Multiple properties — debt allocated across portfolio","value":4,"status":"risk"},{"label":"Recently purchased — first time claiming interest","value":5,"status":"clear"}],"common_ai_errors":[{"error_id":1,"ai_says":"ChatGPT says: Interest deductibility was fully restored in 2024","correct":"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."},{"error_id":2,"ai_says":"ChatGPT says: The interest restriction never affected new builds","correct":"Reality: Correct statement, but often misunderstood in the opposite direction. New builds (constructed 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."},{"error_id":3,"ai_says":"ChatGPT says: I can claim the full interest deduction on my 2023-24 return","correct":"Reality: Wrong. For the 2023-24 income year (1 April 2023 – 31 March 2024), existing residential investment properties had 0% deductibility for the first six months and partial deductibility only from 1 April 2024. The full 80% rate applies to the 2024-25 year. Claims on prior year returns must use the deductibility rate that applied in that period."},{"error_id":4,"ai_says":"ChatGPT says: My trust or company structure does not affect my deductibility","correct":"Reality: Wrong. The ownership structure determines where the deduction is claimed and at what rate. An LTC passes deductions through to shareholders at their marginal rate. A trust claims at 33%. A company claims at 28%. The dollar value of the deduction varies by structure even on identical interest costs."}],"faq":[{"id":1,"question":"When was interest deductibility restored?","answer":"Interest deductibility on residential rental property was fully restored from 1 April 2025. This was enacted in the Taxation (Annual Rates for 2024-25, Emergency Response, and Remedial Measures) Act 2025, which repealed the interest limitation rules introduced in 2021."},{"id":2,"question":"Does this apply to all rental properties?","answer":"Yes. From 1 April 2025, all residential rental properties qualify for full interest deductibility regardless of purchase date, build date, or property type. The previous new build exemption is no longer relevant."},{"id":3,"question":"What determines whether interest is deductible?","answer":"The purpose of the borrowing determines deductibility. Interest on a loan used to acquire, improve or maintain a rental property is deductible. The security (which property the loan is registered against) does not matter. A loan secured against your home but used to purchase a rental property generates deductible interest."},{"id":4,"question":"What happens if I refinanced my rental loan?","answer":"Refinancing itself does not affect deductibility, but tracing becomes essential. You must be able to prove what the refinanced funds were used for. If all funds remained in rental use, the interest remains fully deductible. If you drew private funds in the refinance, only the rental portion is deductible."},{"id":5,"question":"Can I amend prior years where I did not claim interest?","answer":"You can amend tax returns for prior years within the time limit (generally 4 years from the date of the original return). However, during 2021-2024, the limitation rules were law — so no amendment is available for those years. From 1 April 2025, the deduction is fully available."},{"id":6,"question":"What are ring-fenced losses and do they still apply?","answer":"Ring-fencing rules prevent rental losses from being offset against other income. These rules remain in place. If your interest deductions exceed your rental income, the resulting loss is ring-fenced and can only be carried forward to offset future rental income or gains on property disposal."},{"id":7,"question":"What is an LTC and why does it matter?","answer":"A Look-Through Company (LTC) is a company structure where tax obligations pass through to the shareholders. Some landlords hold property in an LTC to manage tax efficiency. With full interest deductibility restored, the advantages of LTC structures for property are different from the period when interest was limited."},{"id":8,"question":"How do I claim the interest deduction?","answer":"Interest on rental property is claimed in your income tax return as a rental expense. If you file through myIR, it is entered in the rental income section. Your accountant will include it in your return. You need an annual interest certificate from your bank for each rental loan."},{"id":9,"question":"What records do I need to keep?","answer":"Keep loan agreements, bank interest statements, settlement documents, and any records showing the purpose of loans (particularly for refinanced debt). IRD can audit rental deductions for up to 7 years after the relevant tax year."},{"id":10,"question":"Does the deduction apply from the start of the 2025/26 tax year?","answer":"Yes. The restoration applies from 1 April 2025, which is the start of the 2025/26 New Zealand tax year. Interest incurred on or after that date on qualifying rental loans is fully deductible."}],"sources":[{"title":"IRD — Interest deductibility for residential rental properties","url":"https://www.ird.govt.nz/property/renting-out-residential-property/residential-rental-income-and-paying-tax-on-it/deductions-for-residential-rental-property/interest"},{"title":"Machine-readable JSON rules","url":"/api/rules/interest-reinstatement-engine"}],"products":{"tier1":{"name":"Your Refinance Tracing System","price":67,"currency":"NZD","description":"How much tax cashflow did you just get back — and how do you maximise it?","url":"https://taxchecknow.com/nz/check/interest-reinstatement-engine/success/assess"},"tier2":{"name":"Your Portfolio Re-Leverage Strategy","price":147,"currency":"NZD","description":"Optimise your entire property portfolio for maximum interest deductibility","url":"https://taxchecknow.com/nz/check/interest-reinstatement-engine/success/plan"}},"monitor_urls":["https://www.ird.govt.nz/property/renting-out-residential-property/residential-rental-income-and-paying-tax-on-it/deductions-for-residential-rental-property/interest"],"canonical":"https://taxchecknow.com/nz/check/interest-reinstatement-engine","api_endpoint":"/api/rules/interest-reinstatement-engine","generated_at":"2026-04-23T06:04:14.991Z"}