Ans: The different components of income are specified under Form 16 in Sections 17(3), 17(2) and 17(1). Companies issue the form on or before May 31 of the upcoming year. Form-16 is a crucial document that helps to prepare the ITR.  Section 17(1) comprises basic salary and different allowances. Section 17(2) mentions the perquisites of the employees, while Section 17(3) includes commissions, bonuses, etc.