Read this first. This article assumes you understand the basic structure of the 2026 Federal Budget reforms. If not, start with the reforms overview article. This one goes deeper into the negative gearing mechanics specifically.
How negative gearing works today
Under the pre-1 July 2027 regime, if your rental property makes a loss, that loss reduces your total taxable income. Your marginal tax rate then determines how much of the loss becomes a tax refund.
Example: $180k salary, $22k rental loss
The $22k rental loss cost the investor $22k in actual cash outflow, but delivered $7,540 back via tax refund. The net after-tax cost of holding the property was $14,460.
How negative gearing works from 1 July 2027
For established residential property acquired after 12 May 2026 7:30pm AEST, the rules change from 1 July 2027. The same $22k rental loss can no longer offset the $180k salary. It can only offset other property or investment income.
If you have no other property income (this is your only investment property), the loss goes into a quarantined pool. It carries forward indefinitely with no expiry. When you eventually have net property income, or sell the property with a capital gain, the accumulated loss offsets that.
Same example, under 1 July 2027 rules (single property, no other property income)
Same property, same rent, same expenses. Different modelled net after-tax cost at the stated inputs. Actual outcomes depend on the reader’s circumstances; an accountant confirms.
Side-by-side over 10 years
Assume the same $22k loss every year (rents rise, so do expenses, roughly balancing). Over 10 years:
Legacy regime (pre-cutoff)
New regime (post-1 July 2027 acquisition)
In this example, the $220k of quarantined losses carries forward. They sit in your pool. When you eventually sell with a capital gain, as announced, quarantined losses carry forward; how they apply to a later gain is for your accountant to confirm. Under the old regime the model gives the tax benefit each year. Under the proposed regime the modelled benefit is deferred rather than annual.
What still works: property with property income
The quarantine is between property income and salary income. It is NOT between properties.
If you own two investment properties, and property A makes a $22k loss while property B makes a $12k profit, the loss offsets the profit within the property bucket. Net property loss: $10k. That $10k gets quarantined.
If you own five investment properties and the aggregate is net positive across the portfolio, negative gearing on any single loss-making property is fully absorbed by the profitable others. No quarantining. If aggregate property income is positive, losses are absorbed within the property bucket in the model. A portfolio with net losses still carries them forward.
Portfolio holders. In the model, a portfolio with net positive property income offsets losses within the property bucket. A single loss-making property shows the quarantine effect. Your accountant confirms your position.
What still works: pre-cutoff acquisitions
As announced, established residential acquired before 7:30pm AEST 12 May 2026 keeps the current treatment. Your accountant confirms how it applies to you. It grandfathers existing holdings.
Under the rules as announced, established residential acquired before the cutoff keeps the current treatment. Your accountant confirms how the transition applies to you.
What still works: new builds
As announced, properties that qualify as "new build" are proposed to keep the current treatment, regardless of acquisition date.
Definition of new build (as announced in the 2026 Federal Budget):
- Vacant land with new dwelling constructed on it. Qualifies.
- Demolition of existing dwelling and replacement with greater dwelling count (e.g. knock-down old house, build 3-townhouse complex). Qualifies.
- Knock-down rebuild same count (e.g. old house demolished, new house built on same footprint). Does NOT qualify.
- Substantial renovations of existing dwelling. Does NOT qualify. Property retains its pre-reno classification.
What the model can show
1. How acquisition date changes the modelled tax position
The model shows the same purchase under both regimes side by side, so the difference in after-tax holding cost is a number rather than a guess. Whether timing a purchase makes sense for you is a question for your accountant and adviser.
2. How new builds are treated under the proposed rules
As announced, qualifying new builds keep the existing negative gearing treatment after 1 July 2027. The model applies that classification to any property entered as a new build. Availability varies by market, and your accountant confirms eligibility.
3. How losses offset within a portfolio
Under the proposed rules, losses offset within the property bucket. The model shows the effect at one, two or more properties at your inputs. It does not recommend buying more property.
4. Model with the tracker
The tracker branches on taxRegime per property. Enter your existing portfolio, model a hypothetical property 3 with a pre-cutoff acquisition date versus post-cutoff acquisition date. Compare the 10-year projections. See what the specific dollar difference is for your situation.
What NOT to do
- Tax is one modifier of holding cost in the model; whether to buy is a separate question. A bad property in a bad area under legacy negative gearing is still a bad property. The tax structure is a modifier, not a rationale.
- Do not assume the reform is settled. Legislation may amend before or during passage. Watch federal budget updates and Treasury releases.
- Do not extrapolate the mechanic to trusts and companies. Trust structures interact with quarantining differently. Get accountant advice specific to your entity structure.
- Existing holders can model the reform too. Quarantining changes the modelled after-tax position of any further purchase; the tracker shows the figures and your accountant confirms treatment.
The compliance frame. This is educational content, not personal tax advice. Speak to a registered tax agent before acting. The reform is proposed as announced and may be amended, and your specific circumstances will influence what the changes actually mean for your after-tax position.