CSR Expenditure is not allowed as expenses under Income Tax Act but the donations which comply with the conditions mentioned in the following sections:
Section 35 - Deduction of Expenditure on Scientific Research Section
35AC - Expenditure on Eligible Projects or Schemes Section
35CCA - Payments to Association & Institution for Carrying out Rural Development programmes Section
35CCD - Expenditure on skill development project notified by the board Section 36(1)(ix) - Applicable to Company who incurs expenditure on promotion of family planning amongst employees
Section 80G - Donation to certain Funds & Institutions Section
80GGA - Deduction in respect of donation to scientific research or rural development section.
Note: Contribution to Swach Bharat Kosh 80G(2)(iiihk) & Clean Ganga Fund 80G(2)(iiihl) must be other than CSR u/s 135 of Companies act.
Please go through the above sections to determine the % of exemption available.