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How Does GST Affect My Commercial Depreciation Claims?

Published 26 June 2026 · Last updated 26 June 2026

Quick Answer

GST impacts commercial depreciation claims by affecting the cost base of depreciating assets. Businesses registered for GST can claim input tax credits, altering the depreciation calculations. Consult Division 40 of ITAA 1997 for detailed guidance.

GST plays a crucial role in shaping the financial landscape of commercial properties in Australia, particularly when it comes to depreciation claims. Understanding the interplay between GST and depreciation can help business owners and accountants optimize tax outcomes.

How GST Affects Commercial Depreciation Claims

When a business is registered for GST, it can claim input tax credits on the GST paid for goods and services, including the purchase of depreciating assets. This impacts the cost base of these assets for depreciation purposes under Division 40 of the ITAA 1997. Essentially, the cost base for depreciation is the GST-exclusive amount if the business is entitled to claim GST credits.

A common misconception is that GST affects the depreciation rate or method — it does not. Instead, GST influences the initial cost base used for calculating depreciation deductions.

How This Works in Practice

Consider a business purchasing a new commercial property in Melbourne for $1,100,000, including GST. If the business is registered for GST, it can claim an input tax credit of $100,000 (assuming the full GST rate applies). This reduces the cost base for depreciation to $1,000,000. Assuming a 2.5% capital works deduction rate, the annual depreciation claim would be $25,000. At a 30% corporate tax rate, this equates to a $7,500 tax saving annually.

Professional Insight

In our experience, many business owners overlook the importance of correctly calculating the GST-exclusive cost base, which can lead to overstatement of depreciation deductions. One thing we frequently see is businesses failing to adjust the cost base after claiming input tax credits, leading to discrepancies in tax filings. Another common oversight is not accounting for GST adjustments on partial business use of an asset.

What most investors don't realise is that incorrect GST treatment can trigger ATO audits, particularly if the claimed depreciation does not align with the GST-exclusive cost base. Ensuring accurate records and understanding the GST impact is crucial.

When Does the Answer Change?

  • Non-GST Registered Businesses: If a business is not registered for GST, the full purchase price, including GST, is used for depreciation.
  • Mixed Use Properties: If a property is used for both taxable and non-taxable purposes, GST adjustments may be necessary.
  • Second-hand Assets: GST implications differ for second-hand assets, especially if acquired from a non-GST registered entity.
  • Margin Scheme: Properties purchased under the margin scheme have different GST considerations that affect depreciation.

When Should You Seek Professional Advice?

Consider seeking advice if your property dealings involve complex GST scenarios, such as mixed-use properties or acquisitions under the margin scheme. Accurate GST treatment requires collaboration between a Chartered Quantity Surveyor and an accountant to ensure compliance and optimization of tax benefits.

What to Do Next

  • Verify your GST registration status and eligibility for input tax credits.
  • Calculate the GST-exclusive cost base for depreciation purposes.
  • Consult with your accountant to ensure correct GST treatment on property acquisitions.
  • Regularly review and adjust depreciation schedules in line with GST changes.
  • Keep detailed records of all GST-related transactions for audit purposes.
  • Engage a Chartered Quantity Surveyor for a professional depreciation schedule.
  • Frequently Asked Questions

    How does GST registration affect depreciation claims?

    GST registration allows businesses to claim input tax credits, reducing the cost base for depreciation to the GST-exclusive amount.

    What happens if I am not registered for GST?

    If not registered for GST, the full GST-inclusive purchase price is used for calculating depreciation deductions.

    Does GST impact the depreciation rate or method?

    No, GST affects the cost base, not the depreciation rate or method. The depreciation calculation uses the GST-exclusive cost.

    Are there state-specific GST rules affecting depreciation?

    GST rules are consistent across Australian states. However, local property taxes and levies may vary, impacting overall costs.

    How do I report GST and depreciation on my tax return?

    GST credits are reported in your BAS, while depreciation deductions are claimed in your annual tax return. Ensure consistency between both.

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