How to Calculate Partial Year Depreciation

by R.L. Cultrona - Updated September 26, 2017
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Normally depreciation of an asset is expensed on a yearly basis. This is so a company can get an accurate picture of what it actually cost to use that asset over the course of a fiscal year. However, a company usually doesn't wait for the year to end to get rid of an asset either by sale or breaking down. When this occurs, the accounting department must use a partial year's depreciation in order to determine the actual depreciation expense.

Determine what the asset's depreciation would have been if the asset was owned for the entire fiscal year. Use the existing depreciation schedule for the asset to determine this. Use the same methodology you have been using for depreciation calculation all along.

Divide the total projected depreciation for the entire year by 12 to get the amount of monthly depreciation on the asset.

Multiply the amount of the monthly depreciation by the amount of months of the fiscal year the asset was owned. This will give you the total amount of depreciation for the partial year.


  • Each asset is going to be depreciated differently so be sure you know which method the asset is being depreciated by before you start this calculation.

About the Author

R.L. Cultrona is a San Diego native and a graduate of San Diego State University. She holds a Bachelor of Arts in theater, television and film with a minor in communications and political science. She began writing online instructional articles in June 2009.

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