Section 17 : Pollution control expenses:
1)   For purposes of computing the income earned by any person from any business in any income year, such person may deduct the pollution control expenses to the extent incurred in the operation of that business in that year.

2) Notwithstanding anything contained in Sub-section (1), in computing the limit of expenses deductible under that Sub-section in any income year, it shall not exceed Fifty percent of the taxable income computed without deducting pollution control expenses of all businesses operated by that person and without including in computation the limits referred to in Sub-section (2) of Section 12 and Sub-section (2) of Section 18.

3) Any excess expense or part thereof which is not deductible in excess of the limit referred to in Sub-section (2) may be capitalized and depreciated pursuant toSchedule-2.

Explanation: For purposes of this Section, "pollution control expenses" means the expenses incurred by any person related with any process for the purpose of controlling pollution or protecting or conserving the environment in other manner.