Negative gearing 2026 Budget: the 12 May cutoff and grandfathering

7:30pm AEST on 12 May 2026 is the line that decides whether your investment property keeps its negative-gearing tax treatment for the life of the holding, or loses that treatment from 1 July 2027. Treasurer Jim Chalmers handed down the 2026-27 Budget tonight, and the headline housing measure is a proposal to restrict negative gearing to newly constructed dwellings only, with established property purchases losing the deduction against wage income on a forward-looking basis.

The measure has been announced. It has not been legislated. No bill is before Parliament yet. The Coalition has signalled opposition; the Greens want the restriction tightened further toward an outright cap on the number of negatively-geared properties per investor. What follows is what the Budget papers actually say, what the grandfathering clause covers, and where the gaps remain pending the draft Explanatory Memorandum.

What is being proposed

Under current law, a rental loss on any investment property is deductible against the owner's other taxable income, including salary and dividends. The sibling article on how negative gearing works in 2026 walks through the mechanics in detail. The short version: a $20,000 loss in the hands of an investor on the 45% marginal rate is worth a $9,000 reduction in the tax bill on their salary income.

The Treasury measure does three things. From 1 July 2027, rental losses on established-property purchases entered into after Budget night will no longer be deductible against wage and salary income. Those losses become quarantined: carried forward and offsettable only against future rental income from the same property, or against the eventual capital gain on sale. New-build investment property keeps the existing treatment in full. Properties acquired before Budget night, regardless of build status, retain full negative gearing for as long as the investor holds them.

The three categories of investor

The grandfathering line creates three distinct cohorts, and the differences between them are material.

• Acquired before 7:30pm AEST, 12 May 2026. Fully grandfathered. Existing investment properties continue to negatively gear against wage income for the life of the holding, with no end date attached. The Treasury fact sheet released with the Budget papers is explicit: the grandfathering travels with the property and the owner, not with the loan or the tenancy. Refinancing the loan does not break grandfathering. A change of tenant does not break grandfathering. Selling the property does.
• Acquired between Budget night and 30 June 2027. Interim treatment. Investors who sign contracts in this window can negatively gear normally up to 30 June 2027. From 1 July 2027 the deduction against wage income stops, and any rental loss from that date is quarantined to future rental income or rolled into the cost base for CGT. This is the cohort most exposed to the policy: full deductibility for roughly a year, then a hard switch.
• Acquired from 1 July 2027 onward. New-only regime. Only purchases of newly constructed dwellings retain negative gearing against wage income. Established property purchases from that date enter the quarantined regime from day one. A buyer who settles on an off-the-plan apartment contracted in 2027 is treated as having acquired a new build; a buyer who settles on a 1990s house contracted in 2027 is not.

Worked example: two settlements, two days apart

Two investors, identical in every relevant respect. Both buy $700,000 investment houses in metropolitan NSW. Both run an annual rental loss of $25,000 (interest, rates, strata, management, maintenance, insurance, depreciation, less rent). Both sit in the 45% marginal bracket.

Investor A settles on 11 May 2026. Investor B settles on 13 May 2026. The contract dates are days apart; the tax outcomes diverge for the life of the holdings.

Investor A (settled 11 May 2026): grandfathered. The $25,000 loss reduces taxable income each year. At a 45% marginal rate that is a tax saving of $11,250 per year, every year, for as long as Investor A holds the property and runs a loss. Across a 10-year hold, the cumulative tax saving is around $112,500 assuming the annual loss holds steady.

Investor B (settled 13 May 2026): interim treatment, then quarantined. From 13 May 2026 to 30 June 2027 Investor B claims the same $11,250 tax saving on the year's loss. From 1 July 2027 the deduction against wage income drops to $0. The $25,000 annual loss does not vanish from the tax return; it carries forward against future rental profit on the same property, or against the capital gain on eventual sale. The final treatment of the carry-forward will be set in the draft bill, and is not yet final.

Cash difference, comparing the 10 years from 1 July 2027 forward at a steady $25,000 loss: Investor A keeps roughly $112,500 of tax savings against wages over that decade. Investor B keeps $0 against wages over the same window. The gap, on identical property and identical losses, is about $112,500 of after-tax cash, plus the time value of money on each year's refund. The carry-forward losses for Investor B retain some economic value at the point of sale, because they reduce the assessable capital gain, but that value is deferred to the exit and partial — a $25,000 loss recognised against a future capital gain at the 45% rate and with the 50% CGT discount applied is worth roughly $5,625, not the $11,250 it would have been worth as an immediate wage offset. The CGT side of the same Budget is covered in the sibling article on the 2026 Budget CGT discount changes, and the indexation-versus-discount mechanics in CGT indexation versus discount worked examples.

What counts as a "new build"?

The Budget speech and the Treasury fact sheet use the phrase "newly constructed dwellings" without releasing the full definitional carve-up. The drafting will land with the Explanatory Memorandum to the bill. On the working version circulating in Treasury background briefings reported by the AFR and The Australian, a new build is a dwelling either unbuilt at the time the contract is signed (off-the-plan) or completed and never previously occupied as a residence. The threshold sits at first occupancy: a property bought directly from the developer before anyone has lived in it qualifies; a property bought from a renovator who held it for six months does not.

That working definition leaves several edge cases open. Substantial renovations of existing stock that the ATO has historically treated as new residential premises for GST purposes may or may not qualify. House-and-land packages where the buyer contracts before construction begins are almost certainly in. Knock-down rebuilds on land the investor already owns will need explicit treatment in the EM. Until the bill is released the prudent reading is the narrow one: off-the-plan and never-occupied stock from a developer.

What the measure does not change

Several adjacent settings are unaffected by the Budget announcement, and the noise around the headline tends to sweep them in.

• Depreciation rules on plant and equipment in newly-acquired second-hand residential property are unchanged. The 2017 changes that limited Division 40 depreciation to new property remain in force. The depreciation schedules for investment property article covers the existing baseline.
• Ordinary deductible expenses continue to be deductible inside the rental schedule itself. Interest, rates, strata, insurance, maintenance, agent fees, and depreciation all keep their character as rental deductions; the change is only to whether the net loss can spill out against salary. The landlord tax deductions checklist remains the operative list.
• Positively geared properties are not affected. If your rent exceeds your deductible costs, you pay tax on the net rental income. The proposal targets loss-makers, not profit-makers.
• The 50% CGT discount on assets held over twelve months is touched by a separate measure in the same Budget. The two changes are independent in mechanics and should be read separately even though they were announced together.

The risk: subject to legislation

Every line above sits inside a single qualifier. The measure is announced policy, not law. The Treasurer's second reading speech is not the bill. Past Federal Budgets have produced announced housing tax measures that subsequently died in the Senate, were watered down in committee, or were deferred indefinitely. The 2017 first-home super saver scheme reached law largely intact; the 2019 capital allowance limitations on rental property took a different shape in legislation than the Budget night announcement implied; several other measures across the past decade did not reach the statute book at all.

The political arithmetic on this one is non-trivial. Labor sits in majority government in the House. The Senate is more contested. The Coalition has indicated it will oppose, which means passage depends on the Greens and the crossbench not splitting. The Greens publicly want a tighter measure and may seek amendments rather than refuse passage; the crossbench numbers will determine whether the bill reaches royal assent in its current shape, in a tighter shape, or not at all.

For an investor with a contract running through May or June 2026, the practical consequence of the subject-to-legislation status is asymmetric. If the bill passes as announced, contracting before 7:30pm AEST on 12 May 2026 grandfathers the property. If the bill is watered down or deferred, the grandfathering may not matter because the new regime may not arrive. The downside of contracting early on the assumption the bill passes is small. The downside of contracting after Budget night on the assumption the bill fails, and then it doesn't fail, is the $112,500-style differential calculated above.

What the policy commentary is missing

The first 24 hours of commentary in the AFR and ABC coverage has focused on the announcement-night optics: whether the measure is "real reform" or "tinkering at the edges", and what it does to rental supply. The rental-supply argument is the one most often run, and it runs in both directions. Reform advocates argue the new-build carve-out channels investor capital toward stock that adds to housing supply rather than competing with owner-occupiers for existing stock. Opponents argue that the majority of investor activity historically sits in established property, and that restricting deductibility will reduce overall investor demand, with downstream effects on rental supply in markets where the build pipeline cannot absorb the demand redirected from established stock.

Both sides of that argument have a stronger version than is usually presented and a weaker version that tends to get quoted. The honest read is that the elasticities are contested and that the experience of the 2017 New Zealand ring-fencing of rental losses, which is the closest natural experiment, produced effects on both rents and prices that ran below the more dramatic forecasts made in advance. Australian commentary that cites the New Zealand experience as decisive in either direction is overreading it.

What to do this week

If you are mid-contract on an investment purchase with a settlement window straddling Budget night, the document to read is your contract of sale, not the Budget speech. The Treasury fact sheet ties grandfathering to acquisition, which under standard tax law for real property is the date contracts are exchanged, not the settlement date. A contract exchanged on 10 May 2026 and settling on 30 June 2026 should be grandfathered. A contract exchanged on 14 May 2026 and settling on 30 May 2026 falls into the interim regime. The Explanatory Memorandum will confirm which test applies; the contract-exchange test is the working assumption.

For investors evaluating a purchase post-Budget, the rational modelling exercise is to run the after-tax cash flow under three scenarios: current law (the bill fails), announced policy (the bill passes as released), and a plausible amended version (the Greens get the carry-forward period shortened, or the new-build definition narrowed). The rental yield calculator gives you the pre-tax net yield; from there it is a few lines of arithmetic to map each policy scenario onto the after-tax position.

The slogans on negative gearing tend to run ahead of the arithmetic in both directions. On Burbfinderthe worked-example approach is to drop your own numbers in rather than rely on a national average, because the deduction's value depends on your marginal rate, your loss size, and your hold period. The Budget changes the rules for one cohort. The grandfathering clause is the single most important line in the announcement for anyone holding investment property tonight, because it determines whether the existing arithmetic continues to apply to your portfolio or stops applying to your next acquisition.