A systematic presentation of all the incomes, exemptions, rebate, reliefs, deductions together with calculation of taxes is known as computation of total income. There is no set format for the same, generally following elements are considered while making computation of total income - personal details of assessee ( Name, father's name, address, contact details etc), bank account details, income details and calculation of taxes and taxes paid details.
A specimen of the computation has been given here under for you reference.