To work out the deduction you claim under the general depreciation rules, you need to know when you first acquired the asset.
You also need to know the date the asset started to decline in value. This is when you first use it or install it to use for any purpose, including a private purpose.
You can only start claiming deductions for the decline in value from the time when you start using the asset for taxable purposes. For example, in your business.

Example
You bought a depreciating asset on 5 February 2024 and used it only for private purposes until 12 August 2026 when you start using it in your business. The asset is then used only for business purposes (taxable purposes). In this case:
- the asset started to decline in value on 5 February 2024
- you can start claiming deductions for the decline in value from 12 August 2026.
Remember, it’s important to keep records to support your claims. You must be able to show when the asset was acquired and when it was first used for business.