Calculation of Depreciation under the Income Tax Act, 1961

January 18, 2020
calculation of depreciation

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This article is written by Avinash Kumar, a 3rd-year law student from School of law, UPES Dehradun. In this article, he discusses the “Calculation of Depreciation Under The Income Tax Act 1961”. He also discusses the written down value method and additional depreciation under the Income Tax Act. 


The provision for allowing depreciation is contained in Section 32 of the Income Tax  Act, 1961 and is regulated under Rule 5 of the Income Tax Rules. When there is a decline in the value of the tangible or intangible asset used by the assessee, then the deduction is permissible under the Income Tax Act. While at the time of the deduction, the income-tax department calculates the depreciation on the total cost of an asset over the life of the asset. An assessee can calculate the deduction caused by depreciation under a straight-line method or by written line method (WLM). The income tax department uses the concept of a written line method (WLM). However, at the time of deducting depreciation, generating or distribution of power, the Income-tax department uses the concept of “Additional general method”. In certain circumstances, the Income Tax Act allows a deduction for additional depreciation in the year of purchase.


Meaning of depreciation under the Income Tax Act

Section 32 of the Income Tax Act 1961 talks about depreciation. Depreciation is defined as a reduction in the value of the asset due to wear and tear of the asset. People claim the deduction of depreciation only for accounting or for the purpose of taxation.

Income Tax Act of 1961 allows the depreciation of tangible assets and intangible assets. In the case of a tangible asset, you can claim the deduction against building, plant, and machinery. In the case of an intangible asset, you can claim a deduction against the patents, trademark, copyright, license, franchise or any other business or commercial right of similar nature. You can claim the deduction on depreciation on those assets which have been used by the assessee for the purpose of business or profession during the previous year.

If any asset which has been used for more than 180 days then 50% of depreciation is allowable in that year. For availing the benefit of deduction under depreciation, it is not mandatory that assets should be used by the assessee in the previous year. If an asset is purchased by the assessee and then leased out to the lessee, the assessee can claim the deduction of depreciation under the Income Tax Act.  

Rates of depreciation

Rates of depreciation on the following assets: 

To know more about the depreciation rate on different assets you can click here

Condition for claiming depreciation under Income tax

For availing the deduction on depreciation, an assessee will have to fulfill some conditions. These conditions are as follows:

Written down value method (Block wise)

Every year the book value of the asset decreases and depreciation of the asset is computed on the book value of the asset. The written down value (WDV) method is the best way to calculate the depreciation of the asset because the depreciation amount goes on decreasing with time. Section 32(1) of the Income Tax Act 1961 says that depreciation should be computed at the prescribed percentage on the WDV of the asset, which in turn is calculated with reference to the actual cost of the asset. When an assessee is acquiring the asset in the previous year then the actual cost becomes the WDV. While the asset acquired in earlier year WDV shall be equal to the actual cost incurred less depreciation allowed under the Act.  

This may be easily followed by the following example:

Depreciable assets on 1.04.2017 on which the depreciation is available at the same rate of 25%.

Asset A


Asset B


Asset C




Less: Depreciation @ 25% of 15,00,000


1.  Written down the value on 1.4.2018 of a block of the asset.

Add: Cost of Asset purchased during 2018-19



Ii. Balance 

Asset B sold during the year 2018-19



iii) Balance 

Less: Depreciation for 2018-19 @ 25% of Rs. 10,50,000    



Written down value of all assets on 1.04.2019


Additional depreciation under the Income Tax Act

The Income Tax Act only permits the written down value method. As per the Additional depreciation method, you can get the deduction only on those assets which have been used in the business or profession. However, an assessee can get the deduction only when assets are used in the year in which it was purchased. But as per the new amendment in the Income Tax Act, 1961, Section 32(1)(iia) says that an assessee can get depreciation of 20% on those plants and machinery which have been involved in the business of manufacture or production of an article. For availing the deduction under additional depreciation the purchase and installation date should be after the 31st March 2005. An assessee can not avail of the additional depreciation on aircraft and ships. These are excluded from additional depreciation. 

From the assessment year 2013-14, a new provision has been added. Further, from 2017-18, another new provision has been added in the Income Tax Act, 1961 which says that those assessees who are involved in the profession of power, can also avail the benefits of the additional depreciation. If an asset has been used for less than 180 days then additional depreciation is allowed at 50% of the rate of additional depreciation.  

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Depreciation in backward area

From 1st April 2016, Section 32(1)(iia), of the Income Tax Act, 1961 allows the possibility of depreciation in the backward areas. If an assessee sets up a business of manufacturing or production in any backward state (Bihar, Andhra Pradesh, Telangana, West Bengal) then, the additional depreciation available to those assessees is 35%, not 20%. Shifts and aircraft are excluded from the additional depreciation. However, an assessee can purchase and install the machinery.    

Who is non-eligible for the additional depreciation?

As per Section 32(1)(iia) of the Income Tax Act, 1961, if an assessee fulfills the below conditions, they are not eligible for availing the deduction under additional depreciation:

Additional depreciation to the generation of electricity

Deduction on additional depreciation is permissible only for that assessee who is involved in the production. A matter of conflict has been raised by the assessee who was generating the electricity. However, a certain amendment has been made by the parliament for allowing the additional depreciation to the assessee.

A claim was raised by the assessee, a joint venture company which was involved in thermal power plant for availing the benefit of deduction on additional depreciation under Section 32(1)(iia) of the Income Tax Act. However, an assessing officer rejected the claim on the ground that this type of benefit will only be granted to the assessee who is involved in the production of an article and this does not include the generation of electricity. After that, the Income-tax department served the notice to the assessee under Section 154 of the Income Tax Act 1962 the assessee gave an explanation to the income-tax officer which was not accepted by the assessing officer. 

In 2013, Section 32(1)(iia) of the Income Tax Act was amended and after the amendment Income Tax Act 1961, made a provision that says that additional depreciation could be granted to an entity that is involved in the business which generates and distributes power. In the case of the State of Andhra Pradesh vs NTPC, the Supreme Court held that electricity is able to be transmitted, transferred and delivered. So on this logic, the Income-tax Officer can not deny an assessee from claiming additional depreciation for generating electricity. The Supreme Court gave the judgment in favor of the assessee and held that an assessee who is generating electricity can claim the deduction of additional depreciation under Section 32 (1)(iia) of the Income Tax Act, 1961.   


Section 32 of the Income Tax Act, 1961 allows compulsory deduction on account of depreciation. However for claiming the deduction under section 32 of the Income Tax Act, 1961 an assessee has to fulfill some conditions. The written down method is one of the best ways of calculating depreciation under the Income Tax Act. As per Section 32(1)(iia) of the Income Tax Act, 1961, an assessee can claim the additional depreciation. Depreciation helps the assessee in many ways, sometimes it helps in financial management and sometimes this serves as a tax saving option.


  1. Income Tax Act, 1961.
  2. Tax law book by Taxman.
  3. https://cleartax.in/s/depreciation-income-tax-act

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