Depreciation calculator

Estimate tax depreciation using the diminishing value or straight line method, with part-year apportionment in the first year.

Use the rate set by Inland Revenue for your asset class (see IRD's depreciation rate finder). The first year is apportioned by whole months owned. Assets costing $1,000 or less (excl. GST) can usually be expensed immediately. Investment Boost: new assets (or assets new to New Zealand) bought on or after 22 May 2025 can claim an extra 20% of cost in the first year, with normal depreciation on the remaining 80%. Second-hand assets bought in New Zealand and residential buildings do not qualify. Buildings with an estimated useful life of 50 years or more are depreciated at 0% from the 2024–25 income year. Private-use adjustments are simplified; disposals, depreciation recovery and pooling are not included.

Important: This calculator gives general estimates only. It is not tax, financial, lending or legal advice, and using it does not create a client relationship with Yugraj Singh Mahil Chartered Accountants Limited. Rates, thresholds and rules reflect the 2026–27 tax year and were last reviewed on 18 October 2026. They can change at any time, and the results may not reflect your circumstances. Please confirm current rates with Inland Revenue, ACC or your lender, and get advice before making decisions. To the extent permitted by law, we accept no liability for any loss arising from use of or reliance on this calculator. Questions? Call 021 0234 6659 or email ysm@yugrajca.co.nz.