Property prices do not move in one direction forever. In September 2026, property value falls Australia are becoming particularly clear across parts of the country, with some suburbs experiencing significant declines while other markets remain more resilient.
Recent Domain data reported by Time Out Australia shows that some regions experienced substantial falls in the June quarter. Sydney’s Eastern Suburbs – North recorded the largest decline, with median unit values falling by around 15% or $353,500. Other areas across Sydney, Melbourne, Brisbane, Perth and Canberra also recorded significant reductions.
However, a lower property value does not automatically mean a lower tax bill.
For property investors, the more important question is: What does the change in property value mean for your tax position, cash flow and plans?
A lower property value does not create an immediate tax deduction
This is one of the most common areas of confusion.
Suppose you bought an investment property for $900,000 and its estimated market value has now fallen to $800,000.
You generally cannot simply claim the $100,000 paper loss as a deduction in your tax return.
Capital gains tax generally becomes relevant when a CGT event occurs, such as selling or otherwise disposing of the property. The calculation looks at factors including the property’s capital proceeds and cost base.
So, if your property’s value has fallen but you continue to own it, the change in market value is not automatically a deductible capital loss.
Example:
You purchased an investment property for $700,000, and it is now estimated to be worth $620,000.
You may feel $80,000 poorer on paper, but that does not mean you can simply enter an $80,000 tax deduction.
That distinction matters when planning your next move.
Falling values make good record-keeping even more important
A property downturn can be an opportunity to review your records before you eventually sell, refinance, restructure or change how the property is used.
Keep records of:
- Purchase costs
- Legal and conveyancing costs
- Stamp duty where relevant to the cost base
- Capital improvements
- Selling costs
- Rental income
- Repairs and maintenance
- Depreciation and capital works deductions
- Previous tax returns and property schedules
- Relevant property valuations
The ATO expects property owners to retain records supporting their rental income, expenses and eventual CGT calculations.
For example, spending $40,000 on a renovation does not necessarily mean the entire amount can be claimed immediately as a rental deduction. Depending on what the work involves, it may have different tax treatment and could affect the property’s cost base.
That is why keeping the invoice today can matter years later.
What if you are thinking about selling?
A falling market can make selling decisions more complicated.
If you sell an investment property for less than its cost base, you may have a capital loss. Capital losses have their own tax treatment and generally cannot simply be deducted from your salary or business income like an ordinary tax deduction.
They may instead be used against eligible capital gains, subject to the relevant tax rules.
On the other hand, selling a property that has fallen in value does not automatically mean there is no CGT. Your actual calculation depends on your cost base, sale proceeds, ownership history and whether any main-residence exemption or other CGT rules apply.
This is particularly important for Australians who have:
- Lived in the property before renting it out
- Changed a home into an investment property
- Used part of a home to produce income
- Owned multiple properties
- Renovated a property
- Held property through a trust or other structure
A simple property sale can therefore become a much more complicated tax calculation.
The 2026 property market adds another consideration for investors
The current market also needs to be viewed alongside Australia’s changing tax environment.
From 1 July 2027, the government’s announced negative-gearing changes will limit negative gearing for residential property to new builds, with transitional treatment for properties held before 7:30 pm AEST on 12 May 2026. For established residential properties purchased after that time, eligible losses will generally be restricted to income from residential property, including certain capital gains, rather than wages or other non-residential income.
That means investors should not look at a falling property value in isolation.
The bigger picture includes:
Property value + rental income + loan interest + deductions + ownership structure + future CGT + upcoming tax changes.
For example, an investor considering selling an established property should look beyond today’s estimated market value. The decision may also involve the property’s rental performance, accumulated costs, potential capital gains or losses and what happens to the proceeds after sale.
What should property investors do now?
You do not necessarily need to panic because your suburb has appeared on a list of declining markets.
Instead, use the current market as a reason to review your numbers.
1. Check your property’s current position
Obtain reliable information about the property’s current market value rather than relying solely on headlines or an online estimate.
2. Review your rental figures
Compare rent, interest, rates, insurance, repairs, and other expenses against your rental income.
3. Check your tax records
Make sure you have documentation for costs that may be relevant to future tax calculations.
4. Review your CGT position
If you are considering selling, calculate the potential tax consequences before signing a contract.
5. Consider upcoming tax changes
If you purchased or are considering purchasing an established residential property after 12 May 2026, understand how the announced 2027 negative-gearing changes may affect your future deductions.
6. Get advice before making a major decision
Selling, transferring, refinancing, or changing a property’s use can have tax consequences that are difficult to reverse after the transaction occurs.
Frequently Asked Questions
Does a fall in property value reduce my taxable income?
Not automatically. A decline in market value while you continue to own the property generally does not become an immediate income-tax deduction. Tax treatment depends on the relevant transaction and circumstances.
Can I claim a property loss against my salary?
A paper decline in the property’s market value cannot simply be claimed against salary.
For eligible negatively geared properties, the rules can depend on when the property was acquired and whether the property is covered by the 2027 reforms. Properties held before 7:30 pm AEST on 12 May 2026 have transitional treatment under the announced changes.
What happens if I sell an investment property for less than I paid?
You may make a capital loss, depending on the property’s cost base and sale proceeds. Capital losses have specific rules and are generally dealt with through the CGT system rather than treated like an ordinary rental deduction.
Should I get a property valuation if prices are falling?
A valuation can be useful for certain financial, commercial or tax situations, but the appropriate valuation date and tax treatment depend on your circumstances. Do not assume that today’s market value automatically changes your CGT calculation.
What records should I keep for an investment property?
Keep purchase and sale documents, invoices, rental records, loan information, improvement costs and previous tax records. These documents can become important when calculating deductions and CGT.
The Bottom Line
Australia’s property market is showing very different results from suburb to suburb. Recent Domain data highlights property value falls in Australia, particularly across parts of Sydney’s premium market, while other locations have been more resilient.
For property owners, however, the headline figure is only the starting point.
A property falling $100,000 or $350,000 in estimated value does not automatically create a tax deduction. What matters is how you own the property, how you use it, what costs you have incurred, what income it generates, and what you do with it in the end.
At EndureGo Tax, we help property owners look beyond the headline numbers and understand the accounting and tax implications before making major decisions.
If you are considering selling, refinancing, changing your property from a home to a rental, or reviewing your investment strategy, getting the tax position checked before you act can help you avoid expensive surprises later.
