Protect Your Grandfathered Negative Gearing After May 2026
If you owned an investment property before 7:30pm on 12 May 2026, the old negative gearing rules still apply. Here's how not to lose that advantage.
Australia's investment property landscape now has two distinct camps, split at a single moment in time: 7:30pm on 12 May 2026.
If you owned an established investment property before that point, the existing negative gearing rules have been preserved — what property professionals are calling grandfathered status. Your tax treatment remains as it was. But the rules governing properties acquired after that date have changed, creating meaningfully different tax outcomes for existing versus future property owners.
As Property Update explores in a recent episode, Dorian Traill, Senior Wealth Planner at Metropole, examined the key risks in detail — and the central warning is straightforward: if you own a grandfathered property, the decisions you make from here can either protect that advantage or accidentally give it away.
What Threatens Grandfathered Status
Being grandfathered does not mean you can take any action with your investment property without consequence. There are specific decisions that can put that status at risk.
**Renovation:** Improving a grandfathered property can actually enhance your position — renovations can improve depreciation benefits and future investment value — but the nature and scope of the work matters. Repairs and capital improvements receive different tax treatment, and the distinction between the two is not always intuitive.
**Adding a second dwelling:** Subdividing your block or constructing a second dwelling on the same land raises complex questions about how the grandfathered property is treated. If the change creates a new taxable entity or fundamentally alters the character of the original investment, the assumption that the grandfathered rules simply carry forward may not hold.
**Demolition:** Demolishing a grandfathered property — for example, to rebuild a larger dwelling or clear a site for development — may affect grandfathered treatment entirely. Once the original property no longer exists in its original form, the basis for claiming the preserved rules becomes far less clear.
**Mixed-purpose debt:** One of the most easily overlooked risks is loan structure. Mixing personal and investment debt — for example, drawing on an investment loan for personal spending — can compromise the deductibility of your borrowing costs. Once a loan is used partly for non-deductible purposes, separating the personal and investment portions becomes complex, and the deductible component may be permanently reduced.
Loan Structures That Matter
If you're planning to do anything with a grandfathered investment property — renovate, subdivide, refinance, or use its equity to fund another purchase — the finance structure you use is at least as important as the investment decision itself.
**Loan structures can protect deductibility.** The way your borrowings are set up determines what you can legitimately claim as a tax deduction. Getting this wrong doesn't just affect your current tax position — it can lock in a disadvantage that persists for the life of the loan.
**Construction finance needs careful planning.** If you intend to add a dwelling or undertake significant building work, construction loans have specific requirements around drawdowns, valuations and completion milestones. A lender experienced in investment property development will structure this differently from a simple purchase loan, and those differences matter for your tax position.
**Larger developments may require commercial lending.** If your plans extend to a project involving multiple dwellings, you may move outside the scope of standard residential lending. Commercial loan terms differ significantly from residential in pricing, loan-to-value ratios and repayment structures, and your exit strategy should account for this from the start of the project.
**A clear exit strategy guides every decision.** Every property development decision should be made with a specific exit in mind — hold, sell, or refinance to release equity. That exit determines the appropriate finance structure, the level of development that makes sense, and ultimately whether the exercise achieves what you intended.
What Grandfathered Investors Should Do Now
The most important step is to get advice before you take any action on a grandfathered property, not after. The interaction between loan structure, tax treatment and development potential is complex, and the consequences of getting it wrong — losing grandfathered status, compromising deductibility, or ending up in a finance structure unsuited to your project — are difficult and costly to unwind.
Use our investor home loans page to understand what lending is available for different investment scenarios, from straightforward refinancing to construction and development. Our borrowing power calculator can also help you model how your existing portfolio affects your capacity to fund the next stage.
Grandfathered negative gearing represents a meaningful advantage for existing investors. It is worth going to the trouble of protecting it.