According to The Guardian Australia, capital city home values have fallen for a seventh consecutive month, dropping 8.1% since March 2026 as four interest rate hikes this year scare off buyers. Cotality's research director, Tim Lawless, says the decline is now broad-based, with Brisbane and Perth leading October's falls rather than Sydney and Melbourne. For property investors, this is not just a wealth story — it is a tax story, touching capital gains calculations, land tax assessments and depreciation claims in ways many owners haven't yet worked through.
What the Cotality Data Actually Shows
Combined capital city values fell 1.4% in October alone, according to The Guardian Australia's report on the Cotality figures. Lawless described the mid-sized capitals — Brisbane, Perth and Adelaide — as "well and truly in a correction" after extreme growth over the past six years, noting virtually every suburb in those three cities recorded a drop in value over the past three months. High interest rates remain the most significant downside influence, though Lawless also pointed to affordability pressure and an investor pullback linked to the federal government's tax changes.
Despite the seven-month slide, the scale of prior growth means most owners remain well ahead. Property prices have doubled, or nearly doubled, in Adelaide, Brisbane, Perth and Hobart over the past decade, and are up more than 50% in Canberra and more than 30% in Sydney and Darwin, per the same Guardian report. Even a 20% drop in Perth prices from their record high would only return the market to mid-2025 levels, Cotality analysis cited in the article shows. This matters directly for CGT: an investor selling today after years of appreciation is still very likely facing a taxable gain, not a loss, even in a falling market.
For sellers weighing an exit now versus waiting, the practical question is less "has my property fallen in value" and more "what is my accumulated gain relative to my cost base." A property bought in 2016 and sold in late 2026 after an 8.1% pullback from peak may still show a gain of tens of percent depending on the city. The CGT 50% discount for assets held over 12 months remains available regardless of the current downturn, so the tax treatment of a sale hasn't fundamentally changed — only the size of the gain being taxed.
Why This Matters for Land Tax and Depreciation Claims
Land tax in most states is assessed against unimproved land value, which state valuer-generals typically update on a periodic cycle rather than tracking live market movements. A 1.4% monthly fall reported by Cotality for October won't show up in a land tax notice immediately, which means investors in Brisbane, Perth and Adelaide — the cities Lawless identified as leading the correction — may still be paying land tax based on valuations struck closer to the market peak. Where aggregation rules apply across multiple landholdings, this lag can leave investors paying tax on land values that no longer reflect current conditions.
This creates a genuine mismatch worth acting on. Investors who believe their land has been overvalued relative to the current market have the right in most jurisdictions to object to a valuation within a set window after receiving a notice. Given that virtually every suburb across Brisbane, Perth and Adelaide has recorded a drop in value over the past three months according to the Cotality data cited by The Guardian, owners in those markets have a reasonable evidentiary basis for an objection if their land tax assessment hasn't caught up.
Depreciation claims sit on firmer ground through a downturn, since they are tied to the building's cost and age rather than its market value. A falling market doesn't reduce what an investor can claim under Division 40 or Division 43 — it simply means the depreciation deduction becomes a proportionally larger offset against a smaller taxable rental surplus, or a bigger contribution to a negative gearing loss, as rental yields come under pressure from softer sale prices. Investors who haven't had a depreciation schedule prepared, or who are nearing the end of a scheduled claim period, should treat a market downturn as a prompt to review the schedule rather than ignore it.
Context: A Downturn Measured Against History
Lawless noted the pace of decline is tracking at the fastest rate in 40 years, but attributed this largely to how strong the preceding growth cycle had been — the mid-sized capitals in particular recorded extreme growth conditions over the past six years before this correction began.
An 8.1% fall from a six-year growth run that doubled values in several capitals is a correction, not a collapse — but for tax purposes, it changes the arithmetic on every CGT calculation, land tax objection and depreciation review investors run between now and the next valuation cycle.
Readers wanting the mechanics of how capital gains are actually calculated on investment property — cost base additions, the 50% discount, and main residence exemption interactions — should see our Australian Property Tax Guide. The foundational rules on depreciation schedules are covered in our Property Depreciation Schedules Explained guide, and investors buying offshore property amid this volatility should check Australian Tax on Overseas Property for ATO reporting obligations. For broader context on where this cycle sits historically, The Australian Property Cycle Explained and Does Australia Have a Property Bubble? are useful companion reads.
Practical Steps for Investors Right Now
Economist Peter Esho, chief executive at 13x, told The Guardian he believes Sydney and Melbourne are "close to bottoming" while the mid-sized capitals are at an earlier stage of the downturn. This two-speed pattern matters for timing decisions: an investor in Brisbane or Perth facing further falls has more reason to pursue a land tax objection now, while a Sydney or Melbourne owner closer to a market floor may prioritise locking in a sale before a potential rebound increases their eventual CGT liability.
Readers assessing whether to engage a professional to manage the purchase side of any portfolio adjustment can review our guide on what a buyer's agent does and how their fees compare against the value of local market knowledge during a correction phase.
Investors should also watch the rental side of the equation. Cotality data cited by The Guardian shows rents are up more than 50% over six years, adding roughly $245 a week to the median rental rate — a figure that affects the taxable rental income side of any negative gearing calculation even as sale prices soften. For deeper planning around interest rate exposure feeding into these calculations, WealthWatchPro's retirement and tax planning coverage is a useful companion resource for SMSF trustees and retirees holding property.
The bottom line for anyone holding Australian property through this correction: falling prices don't erase a tax obligation, but they do change its size and timing. Investors who run the CGT numbers properly, check whether their land tax valuation has kept pace with the market, and confirm their depreciation schedule is current will be better placed than those who simply wait for the cycle to turn. For the full breakdown, see our Australian Property Tax Guide.
This article was produced with AI assistance and reviewed for accuracy. Content is for informational purposes only and does not constitute financial or property investment advice.
