When you invest in property, shares, or business equipment in Australia, the concept of original cost is central to how your finances are managed and taxed. In 2026, with ongoing changes to financial rules and tax policy, understanding original cost is more important than ever for investors and business owners alike.
Original cost is not just an accounting term—it’s the starting point for working out capital gains, claiming deductions, and making sure your financial records are accurate. Whether you’re selling an asset, preparing your tax return, or planning your next investment, knowing how to calculate and track original cost can help you avoid costly mistakes and maximise your returns.
Newsletter
Get new guides and updates in your inbox
Receive weekly Australian home, property, and service-planning insights from the Cockatoo editorial team.
Next step
Compare finance options with a clearer shortlist
Review lenders, brokers, and finance pathways before you commit to the next step.
What Is Original Cost?
Original cost refers to the total amount you pay to acquire an asset. This includes the purchase price and any additional expenses directly related to the acquisition. These extra costs might include stamp duty, legal fees, brokerage, delivery, and installation charges, depending on the type of asset.
Examples of Original Cost
- Property: The purchase price plus transaction costs such as stamp duty, legal fees, and any initial repairs or renovations required to make the property ready for use.
- Shares: The price paid per share, plus brokerage and other transaction fees.
- Business Equipment: The supplier’s invoice amount, along with delivery, installation, and setup costs.
Original cost forms the basis for calculating depreciation, capital gains or losses, and insurance payouts. It is essential for accurate tax reporting and for determining how much of your investment is taxable when you sell or dispose of an asset.
Why Original Cost Matters in 2026
In 2026, Australian investors and business owners face a landscape shaped by evolving tax policies and economic conditions. The way you calculate and record original cost can affect your ability to claim deductions, determine capital gains, and comply with tax obligations.
Key Reasons to Track Original Cost
- Tax Compliance: The Australian Taxation Office (ATO) requires evidence of original cost for many deductions and capital gains calculations.
- Maximising Deductions: Accurate records ensure you claim all allowable expenses associated with acquiring an asset.
- Avoiding Penalties: Incomplete or inaccurate records can lead to missed deductions or ATO penalties.
- Informed Decision-Making: Knowing your original cost helps you assess investment performance and make better financial decisions.
How Policy Changes Affect Original Cost Calculations
Recent updates to financial policy and tax law have implications for how original cost is calculated and used in Australia. While the details of these changes can vary, some general trends are worth noting for 2026:
- Capital Gains Tax (CGT) Rules: The ATO continues to refine how original cost is treated for assets acquired before certain dates. Transitional rules may apply for some business assets, affecting how original cost is adjusted for inflation.
- Instant Asset Write-Offs: The threshold for instant asset write-offs for small businesses has been extended, allowing eligible businesses to immediately deduct the original cost of certain assets rather than depreciating them over several years.
- Property Investment Deductions: The ATO has clarified that deductions for plant and equipment in residential properties generally apply only to new items, making accurate records of original cost even more important for investors.
These changes highlight the need for careful record-keeping and a clear understanding of what expenses can be included in original cost.
Practical Examples: Original Cost in Action
Selling an Investment Property
Imagine you purchased a property several years ago, paying not only the purchase price but also legal fees, stamp duty, and costs for initial repairs. When you sell, your original cost is the total of all these amounts. Capital gains tax is calculated on the difference between your selling price and your original cost (after accounting for any additional allowable expenses). If you fail to keep records of all your acquisition costs, you may end up paying more tax than necessary.
Buying Business Equipment
Suppose a small business acquires new equipment. The original cost includes the purchase price, as well as delivery and installation fees. If the business is eligible for the instant asset write-off, the full original cost can be claimed as a deduction in the year of purchase. Missing out on including all related costs means missing out on potential tax savings.
Tracking Share Investments
When you buy shares, your original cost is the total amount paid, including brokerage. This figure is crucial for calculating capital gains or losses when you eventually sell the shares. Automated portfolio tracking tools can help, but it’s important to double-check records, especially if you reinvest dividends or participate in share splits.
Tips for Managing Original Cost Effectively
1. Keep Comprehensive Records
Store all receipts, contracts, and statements related to asset purchases. The ATO may request evidence of original cost years after the transaction, so digital and physical copies are both valuable.
2. Understand What Counts as Original Cost
Include all expenses directly related to acquiring the asset, such as:
- Stamp duty
- Legal and conveyancing fees
- Brokerage and transaction fees
- Delivery and installation costs
- Initial repairs or modifications required to make the asset usable
3. Stay Informed About Policy Updates
Tax rules and thresholds can change from year to year. Make it a habit to review ATO updates and consult with a financial adviser or accountant if you’re unsure about what expenses are deductible or how to calculate original cost for a specific asset.
4. Use Digital Tools for Record-Keeping
Many accounting software platforms and portfolio management apps can help you track original cost automatically. These tools reduce manual errors and make it easier to retrieve records when needed.
5. Don’t Overlook Associated Costs
It’s easy to forget about smaller expenses like installation or legal fees, but these can add up and make a significant difference to your deductions and capital gains calculations.
Common Pitfalls to Avoid
- Losing Receipts or Documentation: Without proof of original cost, you may not be able to claim the full amount of deductions or accurately calculate capital gains.
- Forgetting to Include All Eligible Costs: Only including the purchase price and missing out on associated expenses can reduce your tax benefits.
- Not Updating Records After Improvements: If you make improvements to an asset, keep records of these costs as they may affect your cost base for capital gains purposes.
Next step
Compare finance options with a clearer shortlist
Review lenders, brokers, and finance pathways before you commit to the next step.
The Bottom Line: Make Original Cost Work for You
Original cost is more than just a figure on your balance sheet—it’s the foundation for accurate tax returns, smarter investment decisions, and effective business management. In 2026, with tax rules continuing to evolve and digital tools making record-keeping easier, there’s never been a better time to pay attention to how you calculate and track original cost.
By keeping detailed records, understanding what expenses count, and staying up to date with policy changes, you can ensure you’re making the most of your investments and staying compliant with Australian tax law.
For more guidance on managing your finances and making informed investment decisions, visit our finance section.