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What Are the Risks of a Client Self-Assessing Depreciation?

Published 26 June 2026 · Last updated 26 June 2026

Quick Answer

Self-assessing depreciation poses risks like incorrect claims, non-compliance with ATO standards, and potential penalties. Under Division 40 and Division 43 of ITAA 1997, precise asset categorisation and effective life assessment are critical. Engaging a Chartered Quantity Surveyor ensures accuracy and maximises tax benefits.

When a client decides to self-assess depreciation, they take on significant risks that can lead to financial and compliance issues. Depreciation under Division 40 (plant and equipment) and Division 43 (capital works) of the ITAA 1997 requires precise asset categorisation and effective life assessment. Errors in these areas can result in incorrect claims, non-compliance with ATO standards, and potential penalties.

One of the most common misconceptions is that depreciation schedules are straightforward and can be calculated using simple formulas or general estimates. However, the reality is that the ATO has specific guidelines and requirements that must be met. Incorrect categorisation of assets, using inappropriate effective lives, or missing eligible deductions can all lead to significant financial discrepancies.

To see how this plays out in practice, consider a scenario where a client owns a 2015-built three-bedroom townhouse in Melbourne, valued at $800,000. If they attempt to self-assess depreciation, they might overlook the nuances of Division 40 and Division 43. For example, they might incorrectly classify a newly installed air conditioning system, estimating its effective life at 5 years instead of the ATO's recommended 10–15 years. This misclassification could lead to an incorrect tax deduction, potentially costing the client $2,000 in the first year alone.

In our experience reviewing thousands of properties across Australia, we observe that investors often underestimate the complexity of depreciation calculations. Many fail to recognise the benefits of a professionally prepared depreciation schedule, which not only ensures compliance but often uncovers additional deductions. We frequently find that clients who initially self-assess miss out on significant tax savings due to overlooked assets or incorrect categorisations.

The answer can differ depending on your situation. Properties acquired post-9 May 2017, for instance, have restrictions on claiming depreciation for second-hand plant and equipment. Pre-1987 buildings, unless substantially renovated, may not qualify for capital works deductions. Commercial properties, SMSF ownership, and joint ownership also have unique considerations that can affect depreciation claims.

Given the complexities and potential pitfalls, it's crucial to seek professional advice. A Chartered Quantity Surveyor, in collaboration with an accountant, can ensure accurate asset categorisation, compliance with ATO guidelines, and maximised tax benefits. This professional insight is invaluable, particularly when dealing with complex property portfolios or when legislative changes occur.

  • Review your current depreciation schedule for accuracy.
  • Consult with a Chartered Quantity Surveyor to identify missed deductions.
  • Ensure compliance with the latest ATO guidelines and effective life assessments.
  • Discuss any property acquisitions or renovations with your accountant.
  • Consider a professional depreciation schedule for new properties.
  • Educate clients about the benefits of professional advice in depreciation.
  • Frequently Asked Questions

    What is the difference between Division 40 and Division 43?

    Division 40 covers the depreciation of plant and equipment, while Division 43 relates to capital works deductions. Each has specific eligibility criteria and effective life determinations.

    How do post-9 May 2017 rules affect depreciation?

    Properties acquired after this date cannot claim depreciation on second-hand plant and equipment, a crucial consideration for investors in existing properties.

    Can I claim depreciation on a pre-1987 building?

    Generally, no capital works deductions are available for buildings constructed before 1987 unless substantial renovations have occurred.

    How does depreciation affect my tax return?

    Depreciation reduces your taxable income, thereby potentially lowering your tax payable. A thorough depreciation schedule ensures you claim the maximum allowable deductions.

    Are there state-specific variations in depreciation claims?

    While federal laws govern depreciation, certain state incentives or regulations may apply, particularly in areas like heritage-listed properties or state-specific grants.

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    Written by Koste Team · Koste Chartered Quantity Surveyors · AIQS Member · RICS Member · TPB Registered · 1300 669 400 · info@koste.ai