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Commercial Property · Koste Knowledge Base

How Does GST Affect Commercial Property Depreciation?

Published 26 June 2026 · Last updated 26 June 2026

Quick Answer

GST can affect commercial property depreciation by influencing the cost base of depreciating assets. Under Division 40 and 43 of ITAA 1997, GST registered entities can claim depreciation on the GST-exclusive cost of assets. Understanding the GST implications is crucial for accurate tax deductions.

Goods and Services Tax (GST) is a significant consideration for commercial property owners when it comes to depreciation. The interplay between GST and depreciation can influence the tax deductions you can claim, especially if you're registered for GST. Understanding this relationship is key to maximising your tax benefits.

How GST Affects Commercial Property Depreciation

When you purchase a commercial property, the GST component of the purchase price can affect how you calculate depreciation. If you are registered for GST, you typically claim depreciation on the GST-exclusive cost of the property and its assets, as outlined under Division 40 and 43 of the ITAA 1997. This is because GST-registered entities can claim GST credits on their Business Activity Statements (BAS), effectively reducing the cost base of the depreciating assets.

A common misconception is that GST has no impact on depreciation calculations. However, failing to account for GST correctly can lead to inaccurate depreciation deductions and potential issues with the ATO.

How This Works in Practice

Consider a scenario where you purchase a commercial office space in Melbourne for $1,100,000, which includes a $100,000 GST component. If you're registered for GST, you can claim the $100,000 as a GST credit on your BAS, reducing the property's cost base to $1,000,000 for depreciation purposes. Assuming the building structure falls under Division 43, you may claim deductions at a rate of 2.5% per annum, equating to $25,000 annually. If your marginal tax rate is 30%, this results in a tax saving of $7,500 each year.

Professional Insight

In our experience, one of the most overlooked aspects is the timing of GST credits. Business owners often fail to account for the immediate impact on cash flow from claiming GST credits. Another common oversight is not adjusting the depreciation schedule when GST registration status changes. What most investors don't realise is the complexity of mixed-use properties; these often require a nuanced approach to GST and depreciation calculations. Additionally, we frequently see errors in the initial cost base setup, which can snowball into significant issues over time.

When Does the Answer Change?

  • Not Registered for GST: If you're not registered, you cannot claim GST credits, and depreciation is calculated on the GST-inclusive cost.
  • Mixed-Use Properties: Properties with both commercial and residential components may have different GST treatments.
  • Changes in GST Registration: Altering your GST registration status can affect your depreciation calculations.
  • Purchases from Non-Registered Vendors: If you buy from a vendor not registered for GST, the transaction may not include GST, affecting your cost base.

When Should You Seek Professional Advice?

GST and depreciation calculations depend on individual circumstances such as GST registration status, property type, and usage. Given the complexities, consulting a Chartered Quantity Surveyor for a detailed depreciation schedule and an accountant for GST advice is essential. They work together to ensure compliance and optimise tax outcomes.

What to Do Next

  • Confirm your GST registration status and its impact on your property transactions.
  • Obtain a professional depreciation schedule from a Chartered Quantity Surveyor.
  • Consult with your accountant to ensure correct GST treatment in your BAS.
  • Review your property portfolio for any changes in use or structure that may affect GST.
  • Keep abreast of any legislative changes related to GST and property depreciation.
  • Regularly update your depreciation schedule to reflect any changes in property use or legislation.
  • Frequently Asked Questions

    How does GST registration affect depreciation?

    If registered for GST, you claim depreciation on the GST-exclusive cost of assets, as you can recover the GST paid as credits.

    What happens if I deregister for GST?

    You must adjust your depreciation schedule to reflect the GST-inclusive cost base, as you can no longer claim GST credits.

    Does GST affect residential properties?

    GST typically does not apply to residential properties unless they are part of a mixed-use development.

    How do I report GST on my tax return?

    GST is reported on your Business Activity Statement (BAS), not directly on your income tax return.

    Are there state-specific GST rules for commercial property?

    GST is a federal tax, so it applies uniformly across Australia, but consult local regulations for any additional state-specific requirements.

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