Key Takeaways
- Division 43 (Capital Works) allows a 2.5% annual deduction on the original construction cost of the building structure over 40 years.
- Division 40 (Plant and Equipment) covers removable mechanical and decorative assets like air conditioners, hot water systems, and carpets.
- Following 2017 tax reforms, investors cannot claim Division 40 plant depreciation on previously used items in second-hand residential properties.
- A professional quantity surveyor tax depreciation schedule typically costs between $600 and $800 and is 100% tax-deductible.
Property depreciation is frequently described by accountants as the investor’s greatest non-cash asset. While ongoing expenses such as mortgage interest, council rates, and agent management fees require physical cash departing your bank account, depreciation represents an allowable tax write-off that reflects the statutory aging and wear-and-tear of your building structure and internal fixtures.
The Two Wings of Property Depreciation
Under the Income Tax Assessment Act 1997, residential property depreciation is divided into two distinct statutory categories: Capital Works (Division 43) and Plant & Equipment (Division 40).
1. Division 43: Capital Works Allowance (Building Structure)
Division 43 relates to the permanent structural fabric of the building: concrete foundations, brickwork, timber framing, roof trusses, plasterboard walls, tiles, and external retaining walls. For residential properties where construction commenced after 15 September 1987, the ATO permits an annual deduction of 2.5% of the historical construction cost over a 40-year period.
For example, if a modern townhouse had an original documented build cost of $350,000, the owner can claim $8,750 each year ($350,000 × 2.5%) as a direct tax deduction for up to 40 years, irrespective of how many times the property changes hands.
2. Division 40: Plant and Equipment (Removable Fixtures)
Division 40 covers easily removable mechanical, electrical, and decorative assets within the property. Common items include:
- Split-system air conditioning units and ceiling fans
- Hot water systems and solar inverters
- Kitchen cooktops, ovens, rangehoods, and dishwashers
- Floor coverings (carpets, vinyl) and window blinds
- Smoke alarms and security systems
These assets have shorter statutory lifespans determined by the Commissioner of Taxation, allowing higher initial depreciation deductions (using either the diminishing value method or prime cost method).
The Critical 2017 Legislative Shift
In May 2017, federal legislation introduced substantial restrictions on Division 40 plant deductions. Investors purchasing second-hand residential properties (properties where contracts were exchanged after 9 May 2017) can no longer claim depreciation on existing, previously used plant and equipment assets.
However, investors in second-hand properties can still claim:
- Full Division 43 Capital Works deductions (provided the building was constructed after September 1987).
- Division 40 deductions on brand-new plant items that the investor personally purchases and installs after acquisition.
For investors buying brand-new off-the-plan townhouses or newly completed homes, 100% of both Division 40 and Division 43 deductions remain fully claimable, assisting when selecting high-quality modern investment assets.
| Category | Division 43 (Capital Works) | Division 40 (Plant & Equipment) |
|---|---|---|
| Asset Nature | Permanent structure, walls, roofs, tiles | Removable appliances, carpets, air-con |
| Deduction Rate | 2.5% per annum for 40 years | Variable effective life (e.g., 5 to 15 yrs) |
| Second-Hand Property Claimable? | Yes (if built post-Sep 1987) | No (unless newly purchased by buyer) |
| Brand New Property Claimable? | Yes | Yes |
The Role of a Quantity Surveyor
Under ATO Tax Ruling TR 97/25, real estate agents, accountants, and property owners are not legally qualified to estimate historical construction costs. To claim depreciation, you must commission a certified Quantity Surveyor accredited by the Australian Institute of Quantity Surveyors (AIQS).
The surveyor conducts an on-site physical inspection and produces a comprehensive 40-year tax depreciation schedule. By incorporating this schedule into your annual tax preparation, you can dramatically improve net holding cash flows by reducing overall taxable property income, offsetting initial transaction friction including statutory property purchase calculations.
Renovations and Capital Improvements Post-Purchase
While the 2017 legislative amendments restricted Division 40 plant deductions on existing second-hand property fixtures, investors can unlock substantial new tax write-offs through strategic post-purchase renovations. Any brand-new plant and equipment assets that you personally purchase and install—such as replacing an old kitchen with modern appliances, installing reverse-cycle air conditioning, or laying new wool carpets—qualify for 100% of Division 40 depreciation deductions.
Furthermore, structural renovations (such as adding an ensuite bathroom, building a covered outdoor deck, or re-tiling living areas) qualify for Division 43 Capital Works deductions at 2.5% per annum for 40 years from the date of completion. Always commission an updated depreciation schedule from your quantity surveyor after completing significant capital renovations.