Some property investors lose the ability to negatively gear against their salary. Most do not. The difference comes down to two dates and one distinction, and there is a third date almost nobody has noticed that gives affected investors one more full year of unrestricted deductions.
The rule in one paragraph
For most taxpayers, if you contracted to buy an established residential dwelling after 7:30pm AEST on 12 May 2026, net rental losses on it can only offset residential rental income or residential capital gains — not your wages. The Act excludes widely held unit trusts, complying superannuation entities and amounts relating to fringe benefits, and allows further exceptions for a purpose the Minister determines.
The Act puts it more precisely than most summaries do. Section 26-155(2)(a) grandfathers an ownership interest you last acquired before "7.30 pm, by legal time in the Australian Capital Territory, on 12 May 2026". Two things follow. The clock is ACT legal time, which on 12 May 2026 is AEST because daylight saving ended on 5 April. And the test is strictly earlier than 7:30pm — a contract executed at exactly 7:30pm is not grandfathered.
The date that actually matters this year
Here is the part that is missing from nearly every guide, and it is worth real money right now.
The quarantine does not apply until the 2027-28 income year. Schedule 2 item 5 of the Act applies the amendments "in relation to the 2027-28 income year and later income years". So if you bought an established dwelling in, say, August 2026 — squarely post-cutoff, definitely not grandfathered — your rental loss for 2026-27 is still fully deductible against your salary. Nothing changes until 1 July 2027.
That is not a loophole, it is the commencement provision, and it means affected investors have one more full year of ordinary negative gearing. It also means any calculator telling you your deduction is already gone is wrong about this year.
The size of the cliff is worth seeing rather than describing.
Same property, same loss, different year
What the quarantine costs a property that is not grandfathered
| Income year | Rental loss | Tax saved |
|---|---|---|
| 2026–27 | $18,917 | $7,377.55 |
| 2027–28 | $18,917 | $0.00 |
The loss does not change. What it is worth to you falls by
$7,377.55
With no other residential rental income, the whole $18,917 carries forward and saves you nothing at all this year.
Assumes an established dwelling contracted after the cutoff, so not grandfathered. Other property costs held at typical values; the two years differ only by the income year. Check your own status with the grandfathering checker.
Three ways you are grandfathered
1. You contracted before the cutoff. Anything contracted before 7:30pm AEST on 12 May 2026 keeps full negative gearing indefinitely, regardless of when settlement happened or how long you hold. It is the contract date that counts, not settlement.
2. You bought a new residential dwelling. New dwellings are grandfathered whenever you bought them.
The catch used to be that "new residential dwelling" had no legal definition at all. That has moved. Treasury released an exposure draft of the Tax Reform No. 3 Bill on 4 August 2026 proposing an actual test: broadly, a dwelling that genuinely adds to housing supply and was acquired within 24 months of its certificate of occupancy — extended from the 12 months announced in the Budget, to let builders clear stock on hand. The draft also covers dwellings built on vacant land, additional dwellings created on land that already has homes, and conversions from non-residential buildings.
Two caveats on that. It is an exposure draft, consultation closed on 21 August 2026 and nothing is enacted, so treat the 24 months as a signal rather than a rule. And the mechanism has shifted: the Act contemplated a Ministerial legislative instrument under s26-160(4), while Treasury now says the final definition will go into primary legislation. If you have been waiting for an instrument to be registered, that is no longer the thing to watch.
3. It is not residential property. The quarantine reaches residential dwellings only. Commercial property, shares and other geared investments are untouched by it — though the separate CGT changes apply to them, which is a different mechanism in the same Act.
If the quarantine applies, the loss is not merely deferred
This is the most commonly repeated mistake about the reform, and it is comforting in a way that is not warranted.
The usual framing is that quarantined losses are not lost, just carried forward — they pool per taxpayer rather than per property under s26-155(1), and they can be offset against residential rental income or a residential capital gain in a later year. All true, as far as it goes.
What it misses is section 110-38(8A), inserted by Schedule 2 items 2 and 3 alongside s110-55(9JA). Expenditure that s26-155 stopped you deducting is also denied cost-base treatment. So the distinction is:
- A quarantined amount you later deduct against residential rental income delivers its tax benefit later. It still does not form part of the cost base because the ordinary rules exclude deducted second- and third-element expenditure.
- A quarantined amount you never deduct is not deferred at all. You get no deduction for it, and it does not reduce your capital gain when you sell either — it raises it. That dollar is taxed twice over.
Whether your pool is deferred or destroyed depends entirely on whether you ever generate enough residential rental income or residential capital gains to absorb it. An investor with one negatively geared property and no other rental income is accumulating a pool with no obvious way to use it.
There is also a subtler consequence: a carried-forward loss saves you nothing in the year it arises. The tax benefit arrives only when the loss is actually applied. A calculator showing you an "annual tax saving" on a quarantined property in 2027-28 is showing you a number you will not receive.
Working out your own position
The Am I Grandfathered? checker screens the contract-date and dwelling-type rules, including flagging the one genuinely unresolvable timing case — a contract dated exactly 12 May 2026, where a date alone cannot tell whether it was executed before or after 7:30pm. Entity and fringe-benefit exceptions and any purpose the Minister determines still need to be checked separately.
Once you know your status, the Negative Gearing Calculator applies it to your actual rent, interest and expenses. If you are holding a pool you may never use, the CGT calculator has a field for the cost-base denial so you can see what it costs on sale.
Frequently Asked Questions
The 2027-28 income year, per Schedule 2 item 5 — so from 1 July 2027. A non-grandfathered property still deducts its loss against salary in full for 2026-27.
No. The test is when you last acquired the ownership interest, not later financing activity. Refinancing a grandfathered property does not change its status.
Grandfathering turns on acquisition, not on when or how you began renting. A pre-cutoff purchase stays grandfathered.
No. s26-155(2)(a) grandfathers an interest acquired before 7.30 pm ACT legal time, so 7:30pm exactly falls on the quarantined side. Anything earlier that day is grandfathered.
Only the part you never end up deducting is permanently lost as an income-tax deduction, and s110-38(8A) also keeps that part out of your cost base, so it increases your capital gain on sale. Amounts you later deduct deliver their tax benefit later, but the ordinary cost-base rules still exclude that deducted expenditure.
For most taxpayers the quarantine applies at taxpayer level, but the Act excludes widely held unit trusts, complying superannuation entities and amounts relating to fringe benefits, with further exceptions possible for a purpose the Minister determines. This is a question to put to your accountant rather than one to assume your way around.
No. They are separate mechanics in the same Act. The CGT change applies on sale, to a much broader range of assets. The quarantine applies to the annual treatment of rental losses on established dwellings bought after the cutoff. You may be affected by neither, one or both.