Australian Guide · 2026-27
Grandfathering Negative Gearing —
The 12 May 2026 Cut-Off, Explained
What “grandfathering” means in Australian tax policy, the public record of past negative-gearing reform proposals (Labor 2016, Labor 2019), and how grandfathering would mechanically work if a future reform happened. This is a conceptual + historical explainer — not a prediction of policy or a recommendation to act on possible reforms.
Published 2026-06-18 · Updated 2026-07-29 · Reading time ~8 min
Current legal position (2026-27)
Reform has been enacted, and it is grandfathered. The Treasury Laws Amendment (Tax Reform No. 1) Act 2026 passed Parliament on 25 June 2026 and commences 1 July 2027. From that date, established residential properties acquired after 7:30pm AEST on 12 May 2026can no longer offset rental losses against salary and wages, and the 50% CGT discount is replaced by cost-base indexation with a 30% minimum tax rate on net capital gains. Properties held before that moment are grandfathered under the existing rules, and new builds keep full negative gearing. For the 2026-27 income year nothing has changed yet — but the cut-off date that decides which side you are on has already passed, which is what makes grandfathering a live question rather than a hypothetical one.
1. What “grandfathering” means
In tax policy, grandfathering is a transitional mechanism that allows existing arrangements to continue under the OLD rules when a new rule takes effect — only NEW arrangements after the start date are subject to the new rules. The purpose is to avoid retrospective changes that would disturb investors and other participants who acted in good faith under the prior rules.
Australian tax history has several major grandfathering precedents:
- 1985 introduction of CGT.Assets acquired BEFORE 20 September 1985 are exempt from capital gains tax — sometimes called “pre-CGT” assets. A textbook grandfathering provision still operating today.
- 1987 reversal of 1985 negative-gearing restriction.The Hawke government's short-lived 1985 quarantining of negative-gearing losses was reversed in 1987 partly in response to industry impact. Grandfathering wasn't needed because the rule itself was reversed.
- 2017 Division 40 plant depreciation change. Existing owners of residential investment property kept their plant-equipment depreciation deductions; only acquisitions from 9 May 2017 onward lost the deduction for second-hand plant. Pure grandfathering.
- 2027 30% minimum CGT (proposed). Pensioners and income-support recipients exempt from the 30% floor — the most recent example of a grandfathering-style carve-out in a CGT reform. (See our /au/guides/age-pension-cgt-exemption-2027 page for details.)
2. The public record of past NG reform proposals
Three documented episodes in the post-1987 era. All three included or considered grandfathering of existing investments — none were enacted.
Labor 2016 election platform
Proposal: Restrict negative gearing to NEW (newly built) properties only. Reduce the 50% CGT discount to 25%.
Grandfathering clause: All existing investment properties (purchased before the start date) would have continued to receive negative-gearing deductions and the 50% CGT discount under the existing rules. Only NEW purchases from the start date would have been subject to the new rules.
Outcome: Labor lost the 2016 election. The proposal was not enacted.
Labor 2019 election platform
Proposal: Same structural proposal: limit negative gearing to new properties + halve the CGT discount to 25%. Start date proposed for 1 January 2020.
Grandfathering clause: Identical grandfathering clause — all existing investments preserved under existing rules. The proposal explicitly aimed not to disturb existing investors' tax position.
Outcome: Labor lost the 2019 election. The proposal was not enacted.
2024 Treasury review
Proposal: Independent Treasury review of housing-affordability impacts of negative gearing and the CGT discount. Modelled but did not recommend reform.
Grandfathering clause: Not applicable (no proposal made).
Outcome: Review published. Government took no immediate action at the time; reform followed at the 2026-27 Budget.
2026-27 Budget — ENACTED
Proposal: Limit negative gearing on established residential property to residential property income only (no offset against salary and wages), keeping full negative gearing for new builds. Replace the 50% CGT discount with cost-base indexation plus a 30% minimum tax rate on net capital gains. Announced 7:30pm AEST, 12 May 2026.
Grandfathering clause: Residential dwellings acquired before 7:30pm AEST on 12 May 2026 — including contracts entered before that moment — keep negative gearing under the existing rules. The CGT change applies only to gains accruing after 1 July 2027, via a deemed disposal and reacquisition on that date that resets cost bases. New residential dwellings and affordable housing may elect to retain the 50% discount.
Outcome: Treasury Laws Amendment (Tax Reform No. 1) Bill 2026 passed Parliament on 25 June 2026 and received Royal Assent as Act No. 49 of 2026. Commences 1 July 2027.
Sources: ALP 2016 and 2019 election platforms (party-published documents); Parliamentary Library Research Service briefings on housing-affordability policy; Treasury 2024 housing-affordability review documents. Independent modelling published by the Grattan Institute and the McKell Institute.
3. How grandfathering would work IF a reform happened
Based on the structure of the Labor 2016 and 2019 proposals — the most fully-developed grandfathering frameworks publicly available — the typical mechanics would be:
- A start date is legislated. Usually 6-12 months after the legislation passes. Properties purchased BEFORE this date are under the old rules; AFTER are under the new rules.
- Existing investments preserved indefinitely. All investments purchased before the start date continue to receive the existing tax treatment for their full holding period — including ongoing negative-gearing deductions and the existing CGT discount on sale. No clawback of past deductions.
- New purchases subject to the new rules. Whatever change is being made (e.g. restricting deductions to new construction, halving the CGT discount) applies only to acquisitions from the start date onward.
- Disposal of grandfathered investments is the trigger. When a grandfathered investment is sold, the old rules apply to the entire holding period. Reinvesting the proceeds into a NEW property after the start date would put the new property under the new rules.
This is the historical pattern — a future reform could be structured differently (e.g. with a phase-out instead of permanent grandfathering, or with no grandfathering at all). The pattern described here reflects the public record, not a prediction.
Should this affect investment timing?
There is no timing trade left on established property. The grandfathering cut-off was 7:30pm AEST on 12 May 2026, so buying sooner today cannot put an established home on the old-rules side. What still matters:
- An established property bought now should be modelled without the salary offset from 1 July 2027 — losses will be quarantined to residential property income and carried forward.
- A new build keeps full negative gearing and can elect to retain the 50% CGT discount, so the established-vs-new choice now carries a real tax difference.
- If you already held property before 12 May 2026, you are grandfathered — there is no clawback of past deductions and no need to sell or restructure.
- A property purchased for tax reasons rather than fundamentals can underperform regardless of the rules.
Investment property decisions should rest on the property's fundamentals (yield, location, capital growth, your cash-flow capacity, your investment horizon), with the post-2027 tax treatment built into the cash-flow model rather than assumed away. Consult a licensed financial adviser and registered tax agent before acting.
Related Australian guides + tools
- Negative gearing in Australia — complete guide — how the current rules work, deductible expenses, the 50% CGT discount, with an inline tax-saving calculator at the top.
- Negative gearing calculator — full 10-year cash-flow projection with depreciation, CGT on sale, and after-tax IRR estimate.
- Age Pension & the 2027 CGT exemption — a different example of a grandfathering-style carve-out in current Australian CGT policy.
- Capital gains tax calculator — estimate CGT on an investment property sale under the current 50% discount.
- Stamp duty calculator — compare investor vs first-home-buyer stamp duty across all Australian states.
- EOFY checklist Australia 2025-26 — pre-30 June actions including tax-loss harvesting and prepayment strategies.
Frequently asked questions
What does 'grandfathering' mean in Australian tax policy?+
Grandfathering is a tax-policy mechanism that allows EXISTING arrangements to continue under the OLD rules when a new rule takes effect — only NEW arrangements after the start date are subject to the new rules. It's used to avoid retrospective changes that would disturb investors who acted in good faith under the prior rules. Examples in Australian tax history include the 1985 introduction of CGT (assets acquired pre-September 1985 are CGT-free) and the 2017 removal of Division 40 plant depreciation for second-hand residential property (existing owners kept their deductions; only post-9-May-2017 acquisitions lost the deduction).
Has Australia ever changed negative gearing before?+
Yes, briefly. In 1985 the Hawke Labor government restricted negative-gearing deductions to be quarantined against rental income only, with excess losses unable to offset other income. The change applied without grandfathering. Following an industry response, the restriction was reversed in 1987 and the open negative-gearing system has remained in place since. Subsequent reform proposals (Labor 2016, Labor 2019) included grandfathering specifically to avoid the 1985–87 episode of investor disruption.
What was Labor's 2016 and 2019 negative-gearing policy?+
Both campaigns proposed two changes: (1) restrict negative-gearing deductions to NEW (newly built) properties only, with an aim of stimulating housing construction; (2) reduce the 50% CGT discount to 25% for assets purchased after the start date. Both proposals included grandfathering — existing investment properties at the start date would have continued to receive negative-gearing deductions and the 50% CGT discount under the old rules. Labor lost both elections; neither proposal was enacted. The reform that did pass — the Treasury Laws Amendment (Tax Reform No. 1) Act 2026, commencing 1 July 2027 — follows the same shape: negative gearing limited to new builds, existing holdings grandfathered, and the 50% CGT discount replaced (by cost-base indexation with a 30% minimum tax rate, rather than the 25% discount Labor had proposed).
Are negative gearing rules changing in 2026-27 or 2027-28?+
Not in 2026-27, but yes in 2027-28. The Treasury Laws Amendment (Tax Reform No. 1) Act 2026 passed Parliament on 25 June 2026 and commences 1 July 2027. For the 2026-27 income year the existing rules still apply in full: rental losses remain deductible against salary, and the 50% CGT discount still applies. From 1 July 2027, established residential properties acquired after 7:30pm AEST on 12 May 2026 can only offset rental losses against residential property income, with unused losses carried forward; and the 50% CGT discount is replaced by cost-base indexation plus a 30% minimum tax rate on net capital gains accruing after that date. Properties held before the 12 May 2026 cut-off are grandfathered, and new builds keep full negative gearing. Verify your own position at ato.gov.au before making decisions sensitive to the rules.
If negative gearing reform happened, how would grandfathering work?+
Based on the structure of the Labor 2016 and 2019 proposals — both of which represented the most fully-developed grandfathering frameworks publicly available — the typical mechanics would be: (1) a START DATE is set, usually 6-12 months after the legislation passes; (2) ALL investments purchased before the start date continue under existing rules — same deductions, same CGT discount, indefinitely; (3) Only NEW purchases after the start date are subject to new rules. There is no clawback of past deductions. Existing investors are not forced to sell or restructure. The trade-off in any future reform would likely follow this pattern unless the proposing government explicitly chose not to grandfather (which would be politically unusual).
Can I still buy before the reform and be grandfathered?+
No — for established homes that window closed at 7:30pm AEST on 12 May 2026, and it cannot be reopened by buying sooner now. An established residential property acquired after that moment is on the post-cut-off side: from 1 July 2027 its rental losses can only be offset against residential property income, not salary and wages. There is no rush-to-buy trade available. What does remain is the distinction between property types — new builds keep full negative gearing and can elect to retain the 50% CGT discount — but a property bought for tax reasons rather than fundamentals can underperform regardless of the rules. Decisions should rest on yield, location, capital growth, your cash-flow capacity and your investment horizon, and an established purchase made now should be modelled without the salary offset from 1 July 2027. Consult a licensed financial adviser and registered tax agent.
Where can I find the official record of past negative-gearing reform proposals?+
Three primary sources for the public record: (1) the Australian Labor Party's published 2016 and 2019 platform documents (alp.org.au archives); (2) the Parliamentary Library Research Service briefings on housing-affordability policy; (3) the Treasury 2024 housing-affordability review documents (treasury.gov.au). Independent modelling has been published by the Grattan Institute and the McKell Institute. For the current ATO position on negative gearing, see ato.gov.au's rental properties section.
