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Can I Claim Retaining Wall Construction Costs?

Published 26 June 2026 · Last updated 26 June 2026

Quick Answer

Yes, you can claim retaining wall construction costs as part of capital works deductions under **Division 43 of ITAA 1997**, provided the wall is an integral part of the property's structure. Costs are typically depreciated over 40 years at 2.5% annually. Consult with a Chartered Quantity Surveyor to ensure compliance and maximise your deductions.

Investors and landlords often wonder whether the construction of a retaining wall on their property can be claimed as a deductible expense. The short answer is yes, under specific conditions. Retaining wall costs are generally considered capital works and fall under Division 43 of ITAA 1997. This means these expenses can be depreciated over time, allowing you to claim a portion of the construction cost each year.

Under Division 43, capital works deductions apply to structural improvements, which include items like retaining walls. These deductions are typically spread over 40 years at a rate of 2.5% per annum. To qualify, the retaining wall must be a permanent feature and integral to the property's function or aesthetic, such as preventing soil erosion or providing essential support to the building or landscaping.

One common misconception is that all retaining walls can be claimed immediately. However, they must be capitalised and depreciated over their effective life. It's also important to note that if the retaining wall is on a residential property acquired after 7:30 pm AEST on 9 May 2017, and the wall was previously used, you cannot claim depreciation on it.

To see how this plays out, consider a 2015-built rental property in Surry Hills, Sydney, where the owner installs a new retaining wall at a cost of $20,000. As the wall is a structural improvement, it qualifies for capital works deductions under Division 43. This means the investor can claim $500 annually (2.5% of $20,000) as a tax deduction over 40 years. At a 37% marginal tax rate, this reduces the investor's tax bill by $185 in the first year.

In our experience reviewing thousands of properties across Australia, a few key patterns emerge with retaining wall claims. Firstly, investors often overlook these claims entirely, missing out on potential deductions. Secondly, incorrect classification of the expense can lead to compliance issues with the ATO. We also see investors failing to consider the impact of retaining wall improvements on their property's capital gains tax (CGT) cost base, which can affect future tax liabilities.

The answer can differ depending on your situation. For instance, if the retaining wall is constructed on a commercial property, the depreciation rules might vary slightly, and different rates could apply. Additionally, if the property is held in a self-managed superannuation fund (SMSF), specific regulations and considerations might impact the claim. Properties purchased before the 2017 budget changes are also subject to different rules regarding second-hand assets.

When dealing with retaining wall claims, it is crucial to get professional advice. A Chartered Quantity Surveyor can ensure that your deductions are maximised and compliant with the current tax laws. Working alongside an accountant will also provide a comprehensive view of how these deductions fit into your overall tax strategy.

  • Review your property and determine if any retaining walls qualify as capital works.
  • Consult a Chartered Quantity Surveyor to prepare a depreciation schedule.
  • Speak to your accountant to understand the impact on your overall tax position.
  • Maintain detailed records of construction costs and dates for ATO compliance.
  • Consider future implications on CGT and how improvements affect your property's cost base.
  • Stay informed about changes in tax legislation that may impact your claims.
  • Frequently Asked Questions

    Can I claim a retaining wall on a property purchased after May 2017?

    Yes, if the wall is a new construction or improvement. However, second-hand walls on properties acquired after this date may not qualify for depreciation.

    How does a retaining wall affect my CGT when selling the property?

    The cost of the retaining wall adds to your property's cost base, potentially reducing your CGT liability upon sale.

    Are retaining walls on commercial properties treated the same as residential?

    Generally, yes, but the depreciation rate might vary. Consult a Chartered Quantity Surveyor for specifics.

    What documentation do I need to claim a retaining wall construction?

    Keep detailed records of construction costs, dates, and any relevant contracts or receipts to ensure compliance with ATO requirements.

    Do different states in Australia have unique rules for claiming retaining walls?

    The federal tax rules apply uniformly, but local regulations may affect construction costs or requirements. Check with local authorities if unsure.

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