Australia Property Tax Depreciation Calculator Division 43 & Division 40 — ATO Investment Property Deductions

Australian Property Tax Depreciation Guide — Division 43 & Division 40 Explained

What Is Property Tax Depreciation?

Tax depreciation for investment property refers to the decline in value of a building and its fixtures over time — a deduction that Australian property investors can claim against their rental income to reduce taxable income. Unlike repairs and maintenance (which are deducted in full in the year incurred), depreciation is claimed annually over many years based on the asset's effective life. Property depreciation is governed by Division 40 and Division 43 of the Income Tax Assessment Act 1997 (ITAA 1997) and administered by the ATO.

Depreciation deductions are commonly the second-largest tax deduction for property investors after loan interest, yet studies consistently show that fewer than 20% of eligible Australian investors claim depreciation at all, leaving thousands of dollars on the table each year. A professional depreciation schedule prepared by a registered Quantity Surveyor (QS) is required by the ATO when the original cost of the building is not known — which is the case for most investors who did not build the property themselves.

Division 43 — Capital Works Allowance

Division 43, also called the Capital Works Allowance or Building Allowance, covers the structural elements of the investment property — concrete, bricks, roofing, walls, fixed plumbing, wiring, and other construction that is part of the building itself. The allowance is calculated as a straight-line percentage of the original construction cost (not the purchase price, which includes land and other elements).

For residential investment properties, the rate is 2.5% per annum over 40 years, starting from the date construction is complete. For commercial properties, the rate is 4% per annum over 25 years. The key eligibility rule is the construction commencement date: residential properties must have construction commence after 15 September 1987, and commercial properties after 19 July 1982. For properties built right at the threshold (in the late 1980s or early 1990s), construction start date evidence — such as council permits or builder contracts — is important.

Your first year's Div 43 deduction is pro-rated from your settlement date to 30 June. If you settle on 1 January, you claim half a year's deduction in year one. The annual deduction is fixed in dollar terms throughout the 40-year period (straight-line method) — it does not reduce each year. Renovation capital works you undertake after purchase are depreciable separately, beginning from the date construction is completed, for their own 40-year term.

Division 40 — Plant and Equipment

Division 40 covers the depreciable plant and equipment items — assets that are mechanically or functionally separate from the building structure itself and have a determinable effective life. The ATO publishes effective lives for thousands of assets in Tax Ruling TR 2024/1. Common residential investment property assets and their ATO effective lives include: carpet (8 years), blinds and curtains (10 years), hot water systems (12 years), air conditioning units (10 years), dishwashers (10 years), ovens and cooktops (12 years), smoke alarms (6 years), security systems (10 years), and ceiling fans (10 years).

Most investors use the Diminishing Value (DV) method for Div 40, which front-loads deductions in the early years when the asset is newest. The DV rate is calculated as (150% ÷ effective life). For carpet with an 8-year life, the DV rate is 18.75% per year applied to the opening written-down value — meaning year 1 sees the largest deduction, declining each year. Alternatively, the Prime Cost method spreads deductions evenly (100% ÷ effective life), which some investors prefer for simplicity and predictability.

The Post-2017 Budget Change — Second-Hand Asset Restriction

The 9 May 2017 Federal Budget fundamentally changed Division 40 for individual investors and SMSFs purchasing residential property. Under the new rules, which took effect from 1 July 2017, individual investors and SMSFs cannot claim Div 40 depreciation on plant and equipment that was installed in a second-hand residential property before they purchased it. Only the original purchaser who first installed or purchased those assets can depreciate them.

This change significantly reduced Div 40 benefits for buyers of established residential properties. However, several important exceptions exist: new assets installed by the investor after settlement remain fully depreciable; properties purchased before 7:30 PM on 9 May 2017 are grandfathered; new residential properties (purchased from the developer, never previously used as a rental) are not affected; and companies and trusts are not subject to this restriction.

Practically speaking, if you purchased an established residential investment property after July 2017 as an individual or SMSF, your Div 40 claim is limited to: (1) new assets you purchase and install after settlement; (2) assets that were already depreciated by the vendor and have reached zero written-down value; and (3) assets added during any renovation you undertake. A Quantity Surveyor report remains valuable for the Division 43 building allowance and for identifying and documenting any renovation works.

Why You Need a Quantity Surveyor Report

The ATO requires that Div 43 deductions be based on the actual construction cost of the building — not the purchase price (which includes land, stamp duty, and other acquisition costs). For most investors, the original construction cost is unknown, so the ATO accepts an estimate prepared by a registered Quantity Surveyor (QS) as a reasonable substitute. A QS is a construction cost professional who inspects the property and uses experience and industry benchmarks to estimate what it would have cost to construct the building at the relevant time.

A tax depreciation schedule from an ATO-recognised QS firm typically includes a Section 43 building allowance schedule (40-year deduction table), a Section 40 plant and equipment schedule (asset-by-asset DV and prime cost tables), a low-value pool analysis, and a scrapping schedule if applicable. The schedule is prepared once and used for the life of your ownership — you do not need a new schedule each year unless you undertake substantial renovations. The QS report fee ($500–$900) is itself deductible in the year of expense as a cost of managing your rental income.

Calculating Your Tax Saving From Depreciation

The tax saving from depreciation deductions is straightforward: total annual depreciation × your marginal tax rate. If your combined Div 43 and Div 40 deductions total $8,000 per year and you are on a 39% effective marginal rate (37% income tax + 2% Medicare), your annual tax saving is approximately $3,120. Over 10 years — assuming consistent tax rates — that is $31,200 in tax saved, simply from claiming the depreciation your property generates.

For investors in the top marginal bracket (47% including Medicare and surcharge), the tax saving on $8,000 of depreciation is $3,760 per year. For a company taxpayer at 30%, it is $2,400 per year. The higher your marginal rate and the newer (or more expensively fitted) your property, the more powerful depreciation becomes as an investment strategy tool.

Disclaimer: This calculator provides indicative estimates for educational purposes only and does not constitute tax advice. Property depreciation rules are complex and change regularly. A registered Quantity Surveyor and/or registered tax agent should be consulted before making depreciation claims. Past ATO rulings and legislation should be verified against current ATO guidance at ato.gov.au.