Depreciation is one of the most powerful — and most frequently underused — tax deductions available to Australian residential property investors. Under the Income Tax Assessment Act, investors in income-producing properties are permitted to claim a deduction for the decline in value of the property's physical assets each year, without spending an extra dollar. The rules governing these claims fall into two distinct divisions of the tax legislation: Division 40, which covers plant and equipment, and Division 43, which covers the building structure itself. Understanding the difference between the two is essential for any investor seeking to reduce taxable income legally and efficiently. For the full breakdown, see our Australian Property Tax Guide.
Division 40: Plant and Equipment Depreciation
Division 40 of the Income Tax Assessment Act 1997 covers assets classified as "plant and equipment" — the removable or mechanical components within an investment property. These include items such as dishwashers, hot water systems, air conditioning units, carpets, blinds, ceiling fans, and smoke alarms. Each of these assets has a defined effective life, as determined by the ATO, and investors can claim a deduction each year as those assets wear down. The ATO publishes a comprehensive schedule of effective lives for thousands of asset types, giving investors a clear framework for what can be claimed and over what period.
There are two methods available under Division 40: the prime cost method and the diminishing value method. Under prime cost, the deduction is spread evenly across the asset's effective life. Under diminishing value, a higher proportion of the deduction is front-loaded into the earlier years of ownership — which generally produces a larger tax benefit sooner. Most investors, particularly those in higher income brackets, favour the diminishing value method in the early years of holding a property to maximise immediate cash-flow relief from their tax offset. The choice of method must be consistent for each individual asset once selected.
A critical restriction applies to secondhand residential properties purchased after 9 May 2017. Following ATO rule changes introduced in the 2017 federal budget, investors who buy an established residential property can no longer claim Division 40 depreciation on plant and equipment that was already in the property at the time of purchase — even if those assets still have remaining effective life. This rule does not apply to newly constructed properties, commercial properties, or properties that qualify as substantially renovated. Investors who purchased before 9 May 2017 retain their existing entitlements under grandfathering provisions. This distinction has significantly changed the depreciation calculus for buyers of established investment properties.
For investors purchasing new or substantially renovated properties, Division 40 claims can still generate meaningful tax deductions in the early years of ownership when many assets are relatively new and losing value quickly. Engaging a qualified quantity surveyor to prepare a tax depreciation schedule — rather than relying on estimates — is the accepted standard practice and is typically required if the ATO were ever to scrutinise a claim.
Division 43: Capital Works Deductions
Division 43 covers the structural elements of a building — the construction itself. This includes the concrete slab, brickwork, roofing, internal walls, plumbing, and fixed structural fittings. Unlike plant and equipment, which depreciates at varying rates based on asset type and effective life, Division 43 deductions are claimed at a flat rate of 2.5% per year over 40 years from the date construction is completed. This means an investor can deduct 2.5% of the original construction cost annually, provided the building was constructed after 16 September 1987 for residential properties (different dates apply to commercial buildings).
The construction date threshold is an important practical constraint. If a residential rental property was built before 16 September 1987, no Division 43 capital works deduction is available — regardless of how much was paid for the property or how recently it was purchased. For properties built after that date, the deduction is based on the original construction cost, not the purchase price. This is why a quantity surveyor's depreciation schedule is essential: the surveyor estimates the original construction cost using industry benchmarks, giving the investor a defensible figure to use in their tax return. A purchase price of $800,000 for a property that originally cost far less to build does not inflate the Division 43 base.
Division 43 deductions are available to all investors who purchase a qualifying property, including those who bought an established residential property after May 2017. This is the key distinction from Division 40 under the 2017 rule changes: while plant and equipment claims on secondhand properties were curtailed, capital works deductions under Division 43 were left intact. An investor buying an established apartment built in the 1990s can still claim 2.5% of the original construction cost each year for the remaining years of the 40-year window — even though they may not be able to claim anything for the carpet or dishwasher that came with the property.
For properties constructed after September 1987, Division 43 capital works deductions can continue to generate a legitimate non-cash tax deduction for up to 40 years from construction completion — making the building's age and original construction cost the central variables in any depreciation strategy for established investment properties.
Background: How Depreciation Schedules Work in Practice
The standard mechanism for capturing both Division 40 and Division 43 deductions is a tax depreciation schedule, prepared by a qualified quantity surveyor. The ATO accepts these schedules as the appropriate basis for depreciation claims on investment properties, and they are generally prepared once at or near the time of purchase. The schedule lists every claimable asset and structural element, assigns effective lives and depreciation rates, and produces a year-by-year forecast of expected deductions across the life of the investment. For a detailed explanation of how these schedules are structured, see the Property Depreciation Schedules Explained guide on this site.
It is worth understanding how depreciation interacts with property management costs more broadly. Depreciation is a non-cash deduction — it reduces taxable income without requiring any additional cash outlay in the year it is claimed. This makes it particularly valuable for negatively geared properties, where the investor is already recording a cash loss. Adding a depreciation claim on top of interest expenses, property management fees, insurance, and maintenance costs can substantially reduce the net tax liability. For landlords managing these deductions alongside their broader obligations, the Property Management in Australia — A Complete Guide for Landlords provides useful context on how these costs interact.
Practical Implications for Australian Property Investors
Investors considering whether to purchase new or established property should weigh depreciation entitlements as one input — not the sole driver — of their decision. A brand-new property offers the fullest possible depreciation profile: 40 years of Division 43 claims at the full original construction cost, plus Division 40 claims on all plant and equipment at their highest initial values. An established property purchased after May 2017 offers Division 43 claims only on the remaining window from construction, with no Division 40 claims on pre-existing assets. This differential can add up to a meaningful difference in after-tax cash flow over the early years of ownership, particularly for investors in higher marginal tax brackets.
Investors who have owned a property for several years and never commissioned a depreciation schedule may be missing out on legitimate deductions they could have been claiming. Retrospective claims are possible — the ATO permits investors to amend prior-year tax returns within a two-year window (or four years for certain taxpayers), and a quantity surveyor can prepare a schedule that captures prior unclaimed amounts, subject to ATO rules on amendment. Investors should seek advice from a registered tax agent or accountant before lodging amendments, as individual circumstances vary significantly. The interaction between depreciation, capital gains tax adjustments on sale, and the investor's overall tax position warrants careful planning. For comprehensive guidance, the Australian Property Tax Guide and WealthWatchPro's tax and super planning resources are useful reference points.
One often-overlooked consideration is the CGT cost-base adjustment that applies when a property is eventually sold. Division 43 deductions claimed during the holding period reduce the property's cost base for CGT purposes — meaning a higher taxable capital gain arises on sale. This does not eliminate the benefit of claiming depreciation (the time value of the deductions received during the holding period generally outweighs the future CGT cost), but investors should model both sides of the equation before deciding on a strategy. A qualified accountant with property investment experience is best placed to run these calculations against an investor's specific marginal tax rate and expected holding period.
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.
