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Understanding a Commercial CGT Cost Base Report

Published 26 June 2026 · Last updated 26 June 2026

Quick Answer

A Commercial CGT Cost Base Report calculates the cost base for capital gains tax purposes on commercial properties. It includes acquisition costs, capital improvements, and holding costs, ensuring accurate CGT calculations. Refer to **Division 110 of ITAA 1997** for detailed legislative guidance.

A Commercial CGT Cost Base Report is a vital tool for investors holding commercial properties, as it provides a detailed calculation of the property's cost base for capital gains tax (CGT) purposes. Under Division 110 of ITAA 1997, the cost base includes various elements such as the purchase price, acquisition costs, capital improvements, and certain holding costs. This comprehensive report ensures that your CGT liability is calculated accurately when selling your commercial property.

The most common misconception is that the cost base only includes the original purchase price. In reality, it encompasses much more, such as legal fees, stamp duty, and any capital improvements made to the property. These additional elements can significantly impact the CGT payable, potentially saving investors substantial amounts by reducing the taxable gain.

Take a practical example. Suppose you own a commercial property in Melbourne purchased in 2015 for $800,000. Over the years, you've spent $50,000 on capital improvements and incurred $20,000 in acquisition costs, including legal fees and stamp duty. When calculating your CGT, these costs are added to the purchase price, creating a total cost base of $870,000. If you sell the property for $1,200,000, the capital gain would be $330,000 before any applicable discounts or exemptions.

In our experience reviewing thousands of properties across Australia, we often find that investors overlook the inclusion of capital improvements in their cost base. Additionally, many fail to keep detailed records of acquisition costs, which can lead to underestimating the cost base and overpaying CGT. It's also common for investors to assume that holding costs, such as interest on loans, are part of the cost base, which is not typically the case unless specific conditions are met.

The answer can differ depending on your situation. For instance, properties purchased before 20 September 1985 are exempt from CGT. If the property is held in a self-managed superannuation fund (SMSF), different rules may apply regarding CGT discounts. Joint ownership can also complicate cost base calculations, as costs must be apportioned according to ownership percentage.

Given the complexity of CGT calculations and the potential for significant financial impact, engaging a Chartered Quantity Surveyor and an accountant is advisable. They can ensure all relevant costs are included in the cost base and help navigate any specific circumstances that may affect your CGT liability.

  • Gather all documentation related to your property's purchase and improvements.
  • Consult with a Chartered Quantity Surveyor to prepare a detailed CGT Cost Base Report.
  • Review the report with your accountant to understand your potential CGT liability.
  • Keep thorough records of all future improvements and associated costs.
  • Stay informed about any legislative changes affecting CGT calculations.
  • Consider tax planning strategies to minimise your CGT liability.
  • Frequently Asked Questions

    What elements are included in the CGT cost base?

    The cost base includes the purchase price, acquisition costs like legal fees and stamp duty, and capital improvements. Holding costs are generally not included unless certain conditions are met.

    How does a CGT Cost Base Report benefit commercial property investors?

    It ensures accurate calculation of the capital gain by including all relevant costs, potentially reducing the CGT payable and improving tax efficiency.

    Are there differences in CGT rules across Australian states?

    CGT is federally legislated, so the basic rules are consistent across states. However, state-specific taxes like stamp duty can affect acquisition costs in your cost base.

    How does the CGT discount work for commercial properties?

    Individuals can apply a 50% CGT discount if the property is held for over 12 months, whereas companies do not receive a discount. Consult your accountant for specifics.

    How do I report CGT on my tax return?

    You must report any capital gains in your tax return under the CGT section. It's advisable to use a CGT Cost Base Report to ensure accuracy and consult with your accountant.

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