Federal Budget Caps Negative Gearing on Established Property: What the 12 May 2026 Tax Changes Mean for Investors

EST Financial Market Intelligence | 18 May 2026

Updated 29 September 2026: The negative gearing and capital gains tax changes are now law (Treasury Laws Amendment (Tax Reform No. 1) Act 2026). We have corrected this article to match the legislation as the ATO and Treasury describe it. Market figures are as at 18 May 2026.

On the evening of 12 May 2026, the Federal Government drew a line through Australian property investment history. Investors who owned established residential property before 7:30pm AEST that night, or had signed a contract to buy it, keep negative gearing as they have always known it. Those who buy an established investment property after that moment face a fundamentally different set of rules from 1 July 2027, and the financial consequences are material.

The reforms are the most significant change to residential property tax policy since negative gearing was quarantined between 1985 and 1987. Understanding exactly what has changed, and what has not, is now one of the most important decisions any property investor in Australia will make in 2026.

What the Budget Actually Changed

The government announced two interconnected reforms, now law, that take effect from 1 July 2027. For negative gearing, the dividing line was drawn on Budget night itself: 7:30pm AEST on 12 May 2026.

The first change limits negative gearing to newly constructed dwellings. For investors who buy an established residential property after the budget announcement, rental losses will be “quarantined” from 1 July 2027: they can only be offset against residential property income, including capital gains on residential property, not against salary, wages or other investment income. Unused losses are carried forward to future years. A property bought between Budget night and 30 June 2027 can still be negatively geared until then. This is a significant structural change to the cash flow mechanics of holding established property at a loss.

The second change replaces the 50% capital gains tax discount with cost base indexation plus a 30% minimum tax rate, for gains that accrue from 1 July 2027. Unlike the negative gearing change, it applies to investors whenever they bought: gains made before 1 July 2027 keep the 50% discount, while gains made after that date are adjusted for inflation and taxed at marginal rates subject to a 30% floor. Investors in new builds can choose either method when they sell. For investors in high-growth markets, the CGT impact on eventual disposal is likely to be greater than the negative gearing change on annual cash flow.

Importantly, investment properties held before 7:30pm on 12 May 2026, including those under contract but not yet settled, can continue to be negatively geared under the previous rules until they are sold. For capital gains tax, the protection covers growth up to 1 July 2027: gains made before that date keep the 50% discount, and gains made after it fall under the new rules.

New builds, meaning homes built on vacant land or where an existing home is replaced with more dwellings, and not sold before (other than by the builder within 12 months of first occupation), retain negative gearing regardless of purchase date. This creates a clear policy incentive designed to direct fresh investor capital towards new housing supply rather than established stock.

What This Means in Practice

The Commonwealth Bank has modelled the cash flow impact of the negative gearing quarantining for investors who would previously have used rental losses to offset salary income. The result is an effective financial impact equivalent to a mortgage rate increase of between 90 and 155 basis points, depending on the degree of gearing. For context, the RBA has already raised the cash rate by 75 basis points in 2026, taking it to 4.35%. The budget reform is adding the equivalent of another full rate hiking cycle specifically for investors in established property.

CBA’s revised house price forecast reflects this. The bank now projects national dwelling prices to be approximately 3% lower than they would otherwise have been as a result of the combined policy changes. Price effects are expected to be most pronounced in investor-heavy segments: apartments, townhouses, and lower-priced established dwellings in Sydney and Melbourne.

What this means for you: If you are considering purchasing an established investment property, you are now operating in a different return environment than any investor who bought before 12 May 2026. The negative gearing structure that has underpinned investor demand in Australia for decades has been fundamentally altered for new purchasers of existing stock. Cash flow modelling, yield assessment, and exit strategy all need to be recalculated under the new rules before any decision is made.

The New Build Opportunity

The budget changes have created a clear structural advantage for investors who purchase newly constructed dwellings. New builds keep negative gearing, and their investors can choose between the 50% CGT discount and the new indexation rules when they sell, making them the only property investors who keep that choice for gains made after 1 July 2027.

Unlike the negative gearing window for established property, which closes on 30 June 2027, the new-build treatment has no deadline: new builds keep negative gearing and the CGT choice whether they are bought before or after 1 July 2027. The pressure is more likely to come through price. Competitive demand for new stock from investors redirected away from established property will likely compress the relative value advantage over time.

The policy direction from the federal government is explicit: it wants investor capital flowing into new housing construction, not existing stock. That political reality is now encoded in the tax law.

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