2026 Federal Budget Changes: Why Property Valuations Matter for CGT in Australia
- May 13
- 9 min read
Last night’s 2026–27 Federal Budget delivered the most significant shake-up to Australian property taxation in a generation. The Labor government has confirmed sweeping reforms to Capital Gains Tax (CGT) and negative gearing, with measures designed to fundamentally change how investment property is taxed from 1 July 2027 onwards. For property investors, accountants and advisors, the message is unmistakable: a CGT property valuation in Australia is no longer optional it is central to protecting your position under the new regime.
Across Australia, investors are already searching for clarity on CGT property valuations, retrospective property valuations, trust restructures and how the new rules will impact long-term property wealth. Whether you own a rental property, a commercial asset, an SMSF property or inherited real estate, understanding your property’s market value is now critical for calculating CGT accurately and protecting your position with the ATO.
In this updated guide, we explain:
What the 12 May 2026 Federal Budget actually changed for property investors
Why 1 July 2027 is now the most important valuation date in your portfolio
How CGT cost bases will be reset under the new indexation system
When you may require a retrospective valuation
Why ATO-compliant valuation reports matter more than ever
How Propti helps investors, accountants and advisors navigate the new tax landscape
Inside the 12 May 2026 Federal Budget: Labor’s CGT and Negative Gearing Reforms
Treasurer Jim Chalmers used Budget night to announce the biggest overhaul of property tax settings in decades. The reforms target two long-debated levers the CGT discount and negative gearing and replace them with a new framework intended to encourage investment in new housing supply and tax “real” (inflation-adjusted) gains rather than nominal ones.
The end of the 50% CGT discount
From 1 July 2027, the long-standing 50% CGT discount for individuals and trusts will be replaced with an inflation-adjusted indexation method, with a minimum tax rate of 30% applied to realised capital gains. The intent is to tax only the “real” gain in value above inflation rather than the full nominal gain.
Key features:
The 50% CGT discount remains fully available for assets purchased and sold before 1 July 2027.
Indexation and the 30% minimum tax apply to assets purchased and sold from 1 July 2027.
A transitional rule will apply to assets purchased before 1 July 2027 and sold afterwards.
Newly built housing will be treated more favourably, with both old and new arrangements available so investors can choose whichever produces the better outcome.
Negative gearing limited to new builds
From 2027–28, negative gearing on residential property will be restricted to newly built housing. Investors who purchase established housing after 7:30pm AEST on 12 May 2026 will no longer be able to deduct rental losses against other income (such as wages or salary), although they will still be able to deduct losses against residential property income and carry forward unused losses to future years.
Crucially, existing investors are fully grandfathered. Any property held at the time of the announcement including properties where a contract was entered into but not yet settled can continue to be negatively geared against other income for as long as it is held, with no time limit on the grandfathering.
30% minimum tax on discretionary trusts
From 2028–29, a minimum 30% tax rate will apply to distributions from discretionary trusts. This is aimed at equalising the tax treatment of income earned through trusts and income earned as wages, and will require many family trust structures including those holding property to be reviewed. What this means for property investors: the rules of the game have just changed. Existing portfolios are grandfathered, but every decision from here buy, sell, hold, restructure now needs to be made with reference to the new regime. And in almost every case, the answer starts with an accurate, independent valuation.
Why 1 July 2027 Is Now a Critical Valuation Date
Buried inside the Budget’s technical detail is a mechanism that should have every long-term property investor on the phone to their accountant and their valuer.
For assets owned before 1 July 2027 and sold after that date, the Government will apply a deemed cost base equal to the asset’s market value at 1 July 2027. The purpose is to quarantine gains accrued up to the transition date (which remain subject to the old 50% discount treatment) from gains accrued afterwards (which fall under the new indexation and 30% minimum tax regime).
Critically, taxpayers will be able to determine that 1 July 2027 market value in one of two ways:
Obtain a formal market valuation as at 1 July 2027 from a qualified valuer; or
Adopt a prescribed apportionment methodology that estimates the value based on a notional rate of growth over the ownership period.
For many investors, the prescribed apportionment formula will significantly under-represent how much of the gain accrued before 1 July 2027 particularly for properties bought during weaker market years, properties that were significantly improved, or properties in suburbs that experienced unusual growth. A formal valuation is the only way to lock in the real, evidence-based market value at the transition date.
The bottom line: if you hold investment property across 1 July 2027, a market valuation at that date may be one of the most valuable pieces of documentation in your entire portfolio. It could be worth tens or hundreds of thousands of dollars in CGT savings when the property is eventually sold.
Why Property Valuations Matter More Than Ever for Capital Gains Tax
Capital Gains Tax in Australia has always looked simple on the surface:
Sale price minus cost base equals taxable capital gain.
In reality, determining a property’s true cost base is rarely straightforward and after the 2026 Budget, it is more complex than ever.
Depending on your circumstances, the cost base may now include:
Original purchase price
Stamp duty
Legal fees
Capital improvements
Subdivision costs
Valuation costs
Market value at the date of conversion from a home to an investment property
Market value at the date of inheritance or transfer
Market value at 1 July 2027 (under the new transitional rules)
This is where property valuations become absolutely essential.
A properly prepared valuation can:
Establish a defensible market value at a relevant date
Support retrospective CGT calculations for past events
Lock in the 1 July 2027 deemed cost base under the new transitional rules
Strengthen ATO compliance and reduce audit risk
Reduce the risk of overpaying tax
Support trust and SMSF restructures driven by the new regime
Provide defensible evidence during an audit
Without a formal valuation, investors are left relying on rough estimates, agent appraisals or the prescribed apportionment formula none of which is likely to deliver the best result under the new rules.
Increased ATO Scrutiny on Property Reporting
Alongside the headline reforms, the ATO continues to expand its data-matching capabilities across:
Property sales
Trust distributions
SMSFs
Airbnb and short-stay income
Interstate property holdings
Ownership restructures and related-party transfers
With the transition to indexation creating new valuation requirements and the trust changes pushing investors to restructure, the ATO will be paying closer attention than ever to:
Market values claimed at relevant dates
Cost base calculations
Retrospective valuations
Property improvement costs
Ownership transfer values
In this environment, an independent valuation prepared by a Certified Practising Valuer is not just helpful it is the critical piece of evidence supporting your tax position if it is ever reviewed.
What Is a Retrospective Property Valuation?
A retrospective property valuation determines the market value of a property at a previous point in time.
These valuations are commonly required for:
Converting a principal place of residence into an investment property
Historical tax adjustments
Unlike a standard market appraisal, a retrospective valuation requires detailed historical market analysis and supporting comparable sales evidence from the relevant valuation date. For this reason, retrospective valuations should always be prepared by qualified professionals experienced in ATO-compliant reporting.
Why a Retrospective Valuation Matters: A Worked Example
An investor purchased a Sydney apartment in 2010 and lived in it until 2018 before converting it into an investment property. Under Australian tax rules, the market value at the date the property first became income-producing may form part of the CGT cost base.
If the investor never obtained a valuation in 2018, they may now struggle to accurately calculate their gain and after the 2026 Budget reforms, they may also need a separate valuation at 1 July 2027.
A retrospective valuation prepared by a Certified Practising Valuer can establish a defensible historical market value using:
Comparable sales evidence
Market conditions at the relevant date
Property characteristics
Historical market trends
Without this evidence, the same investor could potentially overpay CGT by tens or even hundreds of thousands of dollars.
When Do You Need a CGT Property Valuation in Australia?
There are now more situations than ever where obtaining an independent property valuation is critical.
Holding investment property across 1 July 2027
Under the new Budget rules, a formal valuation at 1 July 2027 can establish your transitional cost base and preserve the value of gains accrued under the old 50% discount system.
Converting a home into an investment property
When a principal place of residence becomes income-producing, a valuation may be required to establish market value for future CGT purposes.
Inherited property or deceased estates
Executors and beneficiaries often require retrospective valuations to determine the property’s market value at the relevant date of death.
Trust or SMSF transfers
Transferring property between:
may trigger CGT events requiring market valuation evidence and with the 30% minimum tax on discretionary trusts arriving in 2028–29, many trust structures will need to be reviewed before then.
Portfolio restructures following Budget changes
As investors respond to the new tax settings, many will choose to:
Restructure ownership before key transition dates
Sell underperforming assets
Refinance properties - see our refinance valuations
Consolidate portfolios
Independent valuations become essential during every one of these transitions.
Preparing for sale
Many investors now seek a pre-sale market valuation before listing a property to estimate:
Likely taxable gains under the new regime
After-tax proceeds
Potential restructuring opportunities ahead of the 1 July 2027 transition
Why an Independent Valuation Matters More Than an Agent Appraisal
A real estate appraisal and a formal valuation are not the same thing. While an agent appraisal may provide a broad estimate for marketing purposes, the ATO generally expects properly supported valuation evidence prepared by a qualified professional especially under the new transitional rules.
An independent valuation report typically includes:
Detailed market analysis
Comparable sales evidence
Valuation methodology
Commentary on market conditions
Supporting assumptions
Legal and property details
In a post-Budget environment where every dollar of cost base is going to be scrutinised, this is exactly the kind of evidence the ATO is looking for.
How Propti Helps Australian Property Investors
Propti specialises in independent property valuations for Australian investors, accountants, SMSFs and advisors who require accurate, defensible and ATO-compliant reporting.
In the wake of the 2026 Budget, our team is helping clients across Australia with:
Every report is prepared with detailed market evidence and transparent methodology designed to withstand scrutiny from accountants, lenders and the ATO.
Whether you require:
A 1 July 2027 transitional valuation
Support during a restructure
Assistance responding to the Budget-driven changes
Propti delivers clear, reliable and accountant-ready reporting across Australia.
Key Takeaways for Property Investors
The 12 May 2026 Federal Budget replaces the 50% CGT discount with inflation-adjusted indexation and a 30% minimum tax from 1 July 2027.
Negative gearing is being limited to new builds from 2027–28, but existing investments are fully grandfathered.
A 30% minimum tax on discretionary trusts will apply from 2028–29.
Assets held across 1 July 2027 will have a deemed cost base equal to their market value at that date either a formal valuation or a prescribed apportionment formula.
Independent valuations are now the most reliable way to establish that cost base and avoid overpaying CGT.
Retrospective valuations remain critical for historical tax events and restructures.
ATO scrutiny on property reporting will only continue to increase.
Certified Practising Valuer reports provide significantly stronger evidence than informal appraisals or the prescribed apportionment method.
Frequently Asked Questions
Do I need a valuation for Capital Gains Tax in Australia?
Yes. A property valuation may be required when calculating CGT for inherited property, investment property conversions, trust transfers, SMSF transfers and deceased estates and now, under the 2026 Budget reforms, for assets held across 1 July 2027.
What is the 1 July 2027 valuation date?
Under the 2026 Budget, assets owned before 1 July 2027 and sold after that date will have a deemed cost base equal to their market value at 1 July 2027. Investors can either obtain a formal valuation or use a prescribed apportionment formula and a formal valuation will often produce a more favourable outcome.
What is a retrospective property valuation?
A retrospective valuation determines the market value of a property at a previous date and is commonly used for CGT and tax purposes.
Can the ATO reject a real estate appraisal?
Yes. The ATO generally expects an independent valuation prepared by a qualified Certified Practising Valuer rather than an informal real estate appraisal.
When should I get a CGT valuation?
Investors commonly obtain valuations when converting a property into an investment property, restructuring ownership, transferring property between entities, preparing for sale, or establishing a 1 July 2027 transitional cost base.
How long does a retrospective valuation take?
Most retrospective valuation reports can be completed within several business days depending on the property type, complexity and historical date required.
Need a CGT or Retrospective Property Valuation?
If you own investment property in Australia, the 12 May 2026 Federal Budget has fundamentally changed the rules. Now is the time to review how the reforms could impact your portfolio and to start putting the right valuation evidence in place.
Propti provides independent, ATO-compliant property valuations across Australia for:
1 July 2027 transitional cost base valuations
Whether you are preparing to sell, restructure, refinance or simply want clarity around your property’s market value, our Certified Practising Valuers can help. Contact the Propti team today to organise your valuation report.
