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Construction Costs · Koste Knowledge Base

How Construction Costs Affect Your Depreciation Schedule

Published 26 June 2026 · Last updated 26 June 2026

Quick Answer

Construction costs directly impact your depreciation schedule by determining the capital works deductions you can claim under Division 43 of ITAA 1997. The higher the construction costs, the greater the potential deductions, affecting your cash flow. Engaging a Quantity Surveyor ensures accurate cost assessments and maximises tax benefits.

Construction costs are not just a one-time expense; they play a critical role in shaping your property's depreciation schedule. Understanding how these costs impact your tax deductions can significantly affect your investment's profitability.

How Construction Costs Impact Depreciation

Under Division 43 of the Income Tax Assessment Act 1997 (ITAA 1997), construction costs determine the capital works deductions you can claim. Capital works deductions relate to the building's structure and some fixed items, allowing you to claim 2.5% of the construction cost per year over 40 years. This deduction is available for properties built after 16 September 1987. A common misconception is that only new builds qualify for these deductions, but renovations and improvements can also be included if completed post-1987.

How This Works in Practice

Consider a developer who constructs a residential apartment block in Melbourne with a total construction cost of $5 million. Assuming all units are eligible, the developer can claim 2.5% per annum, equating to $125,000 annually in capital works deductions. If the developer's marginal tax rate is 37%, this results in a tax saving of $46,250 annually, significantly impacting cash flow and investment returns.

Professional Insight

In our experience, many investors underestimate the value of a comprehensive depreciation schedule. One thing we frequently see is investors failing to update their schedules after renovations, missing out on additional deductions. Another common oversight is not engaging a qualified Quantity Surveyor to accurately assess construction costs, leading to underclaimed deductions. Most investors don't realise the importance of documenting all construction-related expenses, including professional fees, to maximise their claims. Additionally, overlooking the eligibility of older properties for deductions post-renovation can result in significant lost tax benefits.

When Does the Answer Change?

The impact of construction costs on your depreciation schedule can vary in several scenarios:

  • Pre-1987 Properties: Properties built before 16 September 1987 are generally ineligible for Division 43 deductions unless substantial renovations have occurred.
  • Renovations: Renovations completed after 1987 can be claimed, but only if documented correctly.
  • Commercial vs Residential: Commercial properties have different eligible construction cost components compared to residential properties.
  • Partial Year Purchases: If you purchase a property mid-year, deductions are pro-rated based on the ownership period.

When Should You Seek Professional Advice?

Engage a Chartered Quantity Surveyor when assessing construction costs for depreciation purposes. They can ensure all eligible deductions are identified and accurately calculated. Complex scenarios, such as mixed-use developments or significant renovations, warrant professional advice to navigate the intricacies of tax law effectively. An accountant will also be crucial in aligning these deductions with your overall tax strategy.

What to Do Next

  • Engage a Quantity Surveyor: Obtain a detailed depreciation schedule.
  • Review Construction Costs: Ensure all costs are accurately documented.
  • Update Post-Renovations: Adjust your schedule to include recent improvements.
  • Consult Your Accountant: Integrate depreciation claims into your tax planning.
  • Monitor Changes: Stay informed on legislative changes affecting depreciation.
  • Maintain Records: Keep detailed records of all construction-related expenses.
  • Frequently Asked Questions

    Can I claim depreciation on renovations?

    Yes, if the renovations were completed after 16 September 1987, they can be included in your capital works deductions under Division 43.

    Do construction costs affect both residential and commercial properties?

    Yes, construction costs impact both, but the eligible components for depreciation may differ between residential and commercial properties.

    How do I report depreciation on my tax return?

    Depreciation is reported in the 'Rental Schedule' section of your tax return. Your accountant can assist with the correct entries based on your depreciation schedule.

    Are construction costs in all Australian states treated the same for depreciation?

    Yes, the principles of Division 43 apply across Australia, but specific local building regulations can affect the initial costs.

    How often should I update my depreciation schedule?

    Update your depreciation schedule whenever significant renovations or improvements are made to ensure it reflects the current state of your property.

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