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You can use this tool to:

  • find the depreciation rate for a business asset
  • calculate depreciation for a business asset using either the diminishing value (DV) or straight line (SL) method
  • view the calculation of any gain or loss on sale on the disposal of an asset when appropriate
  • export the calculation results to an Excel workbook.

The results of this depreciation rate finder and calculator are based upon the information you provide. If you’re unsure of what information to enter, refer to Depreciation - a guide for businesses IR260 and the General depreciation rates IR265.

This rate finder and calculator can only be used for assets (other than buildings) acquired on or after 1 April 2005 and for buildings acquired on or after 19 May 2005.

Refer to Historic depreciation rates - for assets acquired before 1 April 2005 IR267.

Before you start

If you want to know the depreciation rate for an asset, you’ll need to know the date you acquired the asset and then confirm that you don’t know the depreciation rate.

And, if you want to calculate the depreciation, you’ll also need to know the:

  • cost or adjusted tax value
  • business use percentage (if less than 100%)
  • depreciation method you want to use
  • disposal date, if applicable.


Buildings rates were changed from the 2011-12 through to the 2020-21 income years. Refer to the Depreciation - a guide for businesses IR260 for how these apply to you.

If the asset is a non-residential building with an estimated useful life of 50 years or more, you’ll need to use the opening tax book value as at the first day of your 2020-21 income year if either of the following apply:

  • owned the building during the 2010-11 income year
  • acquired the building after the 2010-11 income year and before the 2020-21 income year.

If the asset is a building which was acquired before the 2011-12 income year and has an estimated useful life of 50 years or more, we will not be able to provide a final calculation on disposal.

Enter your details into the tool

3 minutes
Depreciation rate finder and calculator

Use this tool to find the depreciation rate and calculate depreciation for a business asset.

Go to this tool

You can work your depreciation amount manually if you prefer.

Work out straight-line depreciation

Work out diminishing value depreciation

Last updated: 05 Oct 2023
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