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Understanding Division 40 Depreciation for Business Assets

Published 26 June 2026 · Last updated 26 June 2026

Quick Answer

Division 40 of the ITAA 1997 covers depreciation of plant and equipment assets used in a business. It allows businesses to claim deductions for the decline in value of these assets over time, reducing taxable income. This includes items like machinery, office furniture, and computers. Speak to your accountant to ensure compliance.

Business owners often overlook the financial benefits of understanding Division 40 depreciation. This can significantly impact your taxable income and cash flow. Division 40 of the Income Tax Assessment Act 1997 allows businesses to claim deductions for the decline in value of depreciating assets used in generating income.

How Division 40 Depreciation Works for Business Assets

Division 40 covers plant and equipment assets, which are tangible items you use in your business to produce income. These include machinery, office furniture, computers, and vehicles. These assets depreciate over time, and the ATO allows businesses to claim a tax deduction for this decline in value, effectively spreading the cost of the asset over its useful life.

The most common misconception is that all assets can be depreciated at the same rate. However, the ATO assigns different effective lives to different asset types, and these must be used to calculate depreciation. For example, a computer might have an effective life of 4 years, while a piece of machinery might be 10 years.

How This Works in Practice

Consider a small manufacturing business in Melbourne that purchases a new piece of machinery for $100,000. According to the ATO, this machinery has an effective life of 10 years. Using the prime cost method, the annual depreciation deduction would be $10,000. Assuming the business is in the 30% corporate tax bracket, this depreciation deduction reduces the taxable income by $10,000, saving the business $3,000 in tax each year.

Professional Insight

In our experience, many businesses fail to optimise their depreciation schedules, leaving money on the table. One thing we frequently see is businesses not keeping updated records of asset purchases, which can lead to missed deductions. Another common oversight is not reviewing asset registers annually to ensure all depreciable assets are accounted for. What most business owners don't realise is that small asset pools can simplify depreciation calculations and improve cash flow. Lastly, engaging a professional to review your asset register can uncover additional deductions you may have missed.

When Does the Answer Change?

  • Immediate Write-Off Thresholds: For small businesses, assets under a certain threshold can be immediately written off rather than depreciated over time.
  • Luxury Cars: Depreciation for luxury vehicles is capped, limiting the amount you can claim.
  • Post-2017 Acquisitions: Assets acquired after certain legislative changes may have different depreciation rules.
  • Pooling: Small business entities can use simplified depreciation rules, such as pooling assets to accelerate deductions.
  • Business Use Percentage: If an asset is used partly for private purposes, only the business use percentage can be depreciated.

When Should You Seek Professional Advice?

Depreciation schedules can be complex, and the rules vary depending on the type of asset and the business structure. A Chartered Quantity Surveyor can ensure all eligible assets are included in your depreciation schedule, while an accountant can integrate this into your tax planning strategy. This collaboration ensures compliance and maximises your tax benefits.

What to Do Next

  • Review your asset register to ensure all eligible assets are included.
  • Consult with a Chartered Quantity Surveyor to prepare or update your depreciation schedule.
  • Speak to your accountant about integrating depreciation into your tax strategy.
  • Consider asset pooling if you qualify as a small business entity.
  • Keep detailed records of all asset purchases and their business usage.
  • Schedule an annual review of your depreciation schedule to capture any changes.
  • Frequently Asked Questions

    What assets qualify for Division 40 depreciation?

    Assets that qualify include machinery, computers, office furniture, and vehicles used in the business. Each asset must be used primarily for business purposes to qualify.

    How is the effective life of an asset determined?

    The effective life is determined by the ATO and reflects how long an asset can be used to produce income. Businesses can use the ATO’s guidelines or self-assess, but must be consistent.

    Can I claim depreciation on second-hand assets?

    Yes, businesses can claim depreciation on second-hand assets, but the effective life may differ. It's best to consult the ATO's guidelines or a professional for precise calculations.

    How does depreciation affect my tax return?

    Depreciation reduces your taxable income, resulting in lower tax payable. It should be included in your annual tax return under deductions for depreciating assets.

    Are there state-specific rules for depreciation?

    Depreciation rules are federally governed, so they apply consistently across all states. However, state-specific incentives or grants might affect your overall tax planning.

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