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If You Own an Investment Property Before 12 May 2026: What the Budget Changes (and What It Doesn't)

The 2026 Federal Budget made the biggest changes to Australian property investment tax rules since 1999. The headlines have generated a lot of anxiety. Most of that anxiety is misplaced for existing owners.

If you owned, or had contracted to buy, a residential investment property before 7:30pm AEST on 12 May 2026, you are grandfathered. Your current negative gearing arrangement continues against your salary. Capital gains accruing before 1 July 2027 keep the 50% discount. The new rules apply to gains accruing after that date and to properties acquired after Budget night.

This guide walks through exactly what changes, what doesn't, and what to do before 1 July 2027 if you are considering selling, buying more, or restructuring.

Important: most measures below are proposed legislation, not law. The income tax cuts have been legislated. The CGT reform, negative gearing changes, and other budget measures are announced policy that still needs to pass Parliament. We have written this on the basis that the measures will be legislated as announced. Final form may change. We will update this article as the bills progress.

TL;DR

• Properties contracted before 7:30pm AEST 12 May 2026 keep current negative gearing rules indefinitely.
• Properties contracted from 7:30pm AEST 12 May 2026 are subject to new negative gearing limits from 1 July 2027 (losses against residential property income only, not salary).
• The 50% CGT discount applies to gains accruing before 1 July 2027 on any asset, including grandfathered properties.
• From 1 July 2027, gains accruing after that date use indexation plus a 30% minimum tax rate, regardless of when the property was acquired.
• New builds remain fully negatively gearable and can choose 50% discount or indexation on CGT.
• The 14 months between Budget night and 1 July 2027 are the window to model whether to sell, hold, or buy more.

The grandfathering rule explained

The single most important date in the 2026 Budget for property investors is 7:30pm AEST, Tuesday 12 May 2026. This is Budget night.

For negative gearing: Properties contracted before 7:30pm AEST 12 May 2026 are grandfathered. You can continue to deduct net rental losses against your salary and other income, indefinitely, for as long as you own the property. This includes properties you settle after Budget night, as long as the contract was entered into before that time.

For CGT: Grandfathering does not apply to CGT in the same blanket way. All assets, including grandfathered properties, transition to the new CGT rules from 1 July 2027. But the transition is fair: gains accruing before 1 July 2027 keep the 50% discount, and only gains accruing after that date use the new indexation plus 30% minimum.

In practice, this means a grandfathered investment property keeps two valuable benefits in different ways. Negative gearing is preserved indefinitely. The 50% CGT discount is preserved for accrued gains up to 30 June 2027.

What stays the same for existing owners

If you own a residential investment property contracted before 7:30pm AEST 12 May 2026, every one of the following continues:

Negative gearing against your salary. If your rental income is less than your interest, depreciation, repairs, agent fees, insurance, council rates, and other deductible expenses, the net loss continues to reduce your taxable income, including your wage and salary income. This applies until you sell the property.

Interest deductibility. Interest on loans used to acquire, improve, or maintain the property continues to be deductible on the same basis as today.

Depreciation. Capital works and depreciating asset deductions continue under existing rules.

The 50% CGT discount on accrued gains. When you eventually sell, the portion of the gain that accrued between purchase and 30 June 2027 keeps the 50% discount.

Main residence exemption. Unchanged.

Six-year absence rule. Unchanged.

The exemption for properties on which you have already paid capital gains. Unchanged.

The grandfathering is broad. The Government's stated intent is to channel investment toward new housing supply without disrupting existing arrangements.

What changes from 1 July 2027

The new rules start two financial years after Budget night. Two things change for grandfathered property owners on that date:

1. Capital gains calculation method. For any sale from 1 July 2027 onward, the gain is split. The portion accruing between purchase and 30 June 2027 uses the 50% discount (with the value at 30 June 2027 set as the cost base for the second portion). The portion accruing from 1 July 2027 to sale date uses indexation plus the 30% minimum tax rate.

2. The ATO will publish guidance on how to value the property at 30 June 2027 for the purpose of splitting the gain. Between 1985 and 1999, indexation was applied quarterly. The detailed mechanics for 2027 will be published before the changeover.

Nothing changes about your ongoing negative gearing if the property is grandfathered. The new gearing rules apply only to properties acquired after Budget night.

What changes if you buy more after Budget night

This is where existing investors need to think carefully. The grandfathering protects your existing property. It does not protect future purchases.

If you contract to buy an established property after 7:30pm AEST 12 May 2026:

• From 1 July 2027, you cannot deduct net rental losses on that property against your salary. Losses can only be deducted against rental income or capital gains from residential property.
• Unused losses carry forward against future residential property income, but they no longer reduce your wage tax.
• All other deductions (interest, depreciation, repairs) continue to be claimable against the rental income itself.
• CGT on the property uses the new indexation and 30% minimum rules for the entire holding period (because acquisition is after Budget night).

If you contract to buy a new build after 7:30pm AEST 12 May 2026:

• Full negative gearing against salary continues to apply.
• On sale, you can choose between the 50% CGT discount or the new indexation method, whichever produces the better outcome for you.

The budget is explicitly designed to make new builds more attractive than established homes for investors. If you are weighing up your next purchase, the new build option preserves the tax benefits you have today; the established option does not.

What about commercial property, shares, and other investments?

Negative gearing changes apply only to residential investment property. Other negatively-geared investments are not affected by the residential rules:

• Commercial property: Negative gearing continues unchanged.
• Shares: Negative gearing on margin loans, share borrowings, and other share-related interest continues unchanged.
• Vacant land: Subject to separate existing rules, not the 2026 Budget changes.
• Build-to-rent developments: Exempt from the new rules.
• Affordable housing programs: Exempt.

CGT changes do apply to all CGT assets, not just residential property. Shares, business equity, art, collectables, and any other CGT asset are subject to the new indexation plus 30% minimum rules from 1 July 2027 for gains accruing after that date.

What to do before 1 July 2027

The 14 months between Budget night and the changeover are decision time. Most existing owners do not need to act urgently. Some do.

Scenario 1: You own one or two investment properties and plan to hold long-term.

Nothing urgent. Your grandfathering protects the negative gearing arrangement. Your CGT position is also protected on accrued gains. Keep your records clean for the eventual split calculation. The ATO will publish guidance on valuing the property at 30 June 2027.

Scenario 2: You own an investment property and were planning to sell within the next few years.

Model the difference. If you sell before 30 June 2027, the entire gain qualifies for the 50% discount under current rules. If you sell after, the gain is split. For a property bought 10+ years ago with significant capital growth, the difference can be material. For a property with modest growth, the difference may be smaller. This is the kind of decision that benefits from a registered tax agent running the numbers for your specific situation.

Scenario 3: You own an investment property and want to buy more.

The grandfathering protects your existing property. Any new established purchase after 12 May 2026 will not enjoy the same negative gearing benefit from 1 July 2027 onward. New builds preserve the full negative gearing benefit. If you are looking at expanding your portfolio, the new-build option is now considerably more tax-efficient than the established alternative.

Scenario 4: You contracted before 12 May 2026 but settled after.

You are grandfathered as long as the contract was entered into before 7:30pm AEST 12 May 2026. Settlement date after that is not a problem. Keep the contract documentation.

Scenario 5: You hold the property in a trust structure.

The new 30% minimum tax on discretionary trust distributions from 1 July 2028 may affect how the rental income flows to your beneficiaries. This is a separate consideration to the negative gearing changes and is worth reviewing with a qualified accountant in the next two years. Rollover relief is available from 1 July 2027 to 30 June 2030 for those who choose to restructure.

What the rules look like in practice

Treasury has published worked examples in its Negative Gearing and Capital Gains Tax Reform fact sheet. The summary cases:

Michael owns a grandfathered established property. Bought before 12 May 2026 for $400,000. Sells in 2029 for $560,000. The gain accruing to 30 June 2027 (Treasury says ATO tools will let him determine the value on that date, in this example $500,000) gets the 50% discount. The gain from $500,000 to $560,000 uses indexation plus 30% minimum.

Sarah buys an established property after Budget night. From 1 July 2027, her net rental losses can only be deducted against residential property income, not her salary. She carries forward unused losses against future rental income. CGT on her eventual sale uses indexation plus 30% minimum for the entire holding period.

David buys a new build after Budget night. Full negative gearing against salary continues. On sale, he chooses between the 50% discount and the new indexation method.

The mechanics are detailed but the principle is clear. Existing arrangements are protected. New purchases after Budget night face a redesigned set of rules that favours new supply.

How Finwell AI helps you track grandfathered status

Two parallel tax systems will run side-by-side from 1 July 2027 for many investors. Each property in your portfolio may be treated differently depending on its contract date. Each capital gain may need to be split between two methods at sale time. Each year's rental position needs to be tracked correctly so the right losses get deducted against the right income.

Finwell AI is built for that complexity. The app tracks the acquisition date and contract date of every property in your portfolio, applies the right negative gearing treatment depending on when you bought, and maintains separate ledgers for rental income, rental expenses, and the eventual capital gain calculation. At sale time, the app splits the gain between pre- and post-1 July 2027 portions using ATO valuation guidance and applies the right discount or indexation method to each part.

The app also flags planning opportunities specific to your situation. If a sale is approaching and the 50% discount on the accrued gain is material, the app will surface that. If you are considering buying another property, the app shows you the tax-adjusted return for an established home versus a new build under the new rules.

At tax time, Finwell AI prepares lodgement-ready forms covering all your rental income, deductions, and any CGT events, runs a peer desktop review, and surfaces suggestions on what you may want to amend. You press a button to lodge. Your accountant can sign in to check before you do.

Finwell AI is a flat monthly subscription, not a percentage of your income. It works with whatever bank, card, and property management software you already use.

Take the 2-minute survey. Founding 500 members get 6 months Premium free.

Frequently asked questions

Q: I contracted to buy an investment property on 11 May 2026 and settled on 1 June 2026. Am I grandfathered?

Yes. Grandfathering applies based on contract date, not settlement date. As long as your contract was entered into before 7:30pm AEST on 12 May 2026, you keep current negative gearing rules indefinitely.

Q: I bought my investment property in 2018. When I sell in 2030, how is the CGT calculated?

The gain is split. The portion accruing between 2018 and 30 June 2027 uses the 50% discount. The portion accruing from 1 July 2027 to your 2030 sale date uses indexation plus the 30% minimum tax rate. The ATO will publish guidance on how to value the property at 30 June 2027 for the purpose of splitting the gain.

Q: Should I sell my investment property before 1 July 2027 to lock in the 50% discount?

Only if it suits your overall plan. If you were going to sell within the next few years anyway, the 50% discount on the full gain is more valuable than the split treatment that applies after. If you are planning to hold long-term, the split treatment is reasonable: you keep the 50% discount on accrued gains and apply the new rules only to future appreciation. This decision should be made with a registered tax agent running your specific numbers.

Q: Can I still negatively gear if I buy another property after Budget night?

Yes, against rental income from any residential property. No, against your salary or wages, unless the property is a new build. Losses carry forward against future residential property income.

Q: Do these changes apply to my main residence?

No. The main residence exemption is unchanged. The 2026 Budget changes apply only to investment property, not the home you live in.

Q: What about properties held in my SMSF?

Super CGT treatment is unchanged. The 2026 Budget does not change the rules for properties held in complying superannuation funds.

This article is general information only and not personal tax advice. For your situation, consult a registered tax agent. The measures described above are based on the 2026-27 Federal Budget announced on 12 May 2026 and may change during parliamentary passage. We will update this article when legislation passes or material changes are announced.