Calculating depreciation for a partial year involves apportioning the depreciation deduction based on the number of days the asset is held or used during that financial year. This is critical because the Australian Tax Office (ATO) requires that deductions reflect the actual period of use, ensuring claims are precise and justified.
Under Division 40 of ITAA 1997, the depreciation of plant and equipment assets must be calculated by considering the effective life of the asset and the number of days the asset was available for use. The most common misconception is that you can claim a full year's depreciation regardless of when the asset was acquired or started being used — this is incorrect.
To see how this plays out, imagine you've purchased a new air conditioning unit for an investment property on 1 January 2023. If the unit's effective life is 10 years, and it cost $3,000, you would typically claim depreciation over its effective life. However, because you only owned it for half the financial year, you would calculate the depreciation for 182 days. Using the diminishing value method, your first-year depreciation claim would be approximately $150. At a 37% marginal tax rate, this reduces your tax bill by $56 in the first year.
In our experience reviewing thousands of properties across Australia, we often see investors overlook the importance of accurately calculating partial year depreciation. Many mistakenly assume they can claim a full year's depreciation or incorrectly calculate the number of days. Another common oversight is failing to adjust for assets acquired through property purchases mid-year, which can lead to missed tax savings.
The answer can differ depending on your situation. For example, if you purchased a second-hand residential property after 9 May 2017, the rules for Division 40 plant and equipment depreciation have changed. You can no longer claim depreciation on previously used plant and equipment unless you were the original owner or the property is commercial. Additionally, if you own the property through a Self-Managed Super Fund (SMSF), the calculation might differ due to tax treatment under the fund's structure.
Getting professional advice is crucial when dealing with complex depreciation calculations. A Chartered Quantity Surveyor can provide an accurate depreciation schedule, while an accountant can ensure that your tax return reflects these deductions correctly. This collaboration ensures you maximise your tax benefits while remaining compliant with ATO regulations.