Australian Guide · 2025-26
Grandfathering Negative Gearing —
What It Means & the Historical Record
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 2026-06-18 · Reading time ~8 min
Current legal position (2025-26)
Negative gearing and the 50% CGT discount remain unchanged. There is no announced reform. The 2024 Treasury review modelled housing-affordability impacts but did not recommend change. The current bipartisan position is no immediate change. This page describes what grandfathering would mean if a future reform were enacted — based on the historical structure of past proposals — and is not a forecast of future policy.
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. Current bipartisan position (2025-26): no immediate change.
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?
No reform is currently proposed. Making an investment decision today based on speculative future policy carries real risk:
- The policy may never happen — the public record shows two failed reform attempts.
- The timing is unpredictable — even if a reform passed, the start date is typically 6-12 months out.
- A property purchased for tax-timing reasons rather than fundamentals can underperform regardless of the rules.
- A future reform could be structured WITHOUT grandfathering — past proposals included it, but that's not guaranteed.
Investment property decisions should rest on the property's fundamentals (yield, location, capital growth, your cash-flow capacity, your investment horizon), not on hypothetical future policy. Consult a licensed financial adviser before acting on possible reforms.
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. As of 2025-26, the rules remain as they have been since 1987 (full negative gearing) and since 1999 (50% CGT discount).
Are negative gearing rules changing in 2025-26 or 2026-27?+
Based on the public record at the time of writing: no announced changes. The 2024 Treasury review modelled housing-affordability impacts of negative gearing without recommending reform. The current bipartisan position is that no immediate change is planned. Future elections and budgets could introduce reform — this guide is not a prediction. If a reform were proposed, the historical pattern (Labor 2016 / 2019) is that it would include grandfathering of existing investments. Verify the current legal position at ato.gov.au and treasury.gov.au before making investment 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).
Should I rush to buy an investment property before a possible reform?+
There is no current proposal to reform negative gearing. Making an investment decision based on speculative future policy carries significant risk — the policy may never happen, the timing is unpredictable, and an investment property purchased for tax-timing reasons rather than fundamentals can underperform regardless of the rules. Historical reform proposals have included grandfathering, but a future reform could be structured differently. Decisions about investment property should be made on the property's own merits (yield, location, capital growth, your cash flow capacity, your investment horizon) — not on hypothetical future policy. Consult a licensed financial adviser before acting on possible reforms.
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.
