First calculate income under the following heads taking into account the exemptions available under each head 1.Salary 2.House property 3.Profits and Gains of business and profession 4.Capital Gains 5.Other sources.The total income from all the five sources taken together is your gross total income.From here take into account deductions available for investments made,donations made,etc.These deductions are available under Sec 80C to Sec 80U.The gross income less deductions give your net taxable income.Now you can calculate your tax as per the prevailing rates.However,it would be better if you ask specific question pertaining to your taxation issues rather than such general questions.
