The first step to tax filing is picking up the income-tax return (ITR) form applicable to you. The form you fill mainly depends on the sources of income you have. There are four forms out of which you need to choose.
Also See Guide to ITR forms
We tell you which one is applicable to you. If you are a salaried employee or a pensioner, you would have to fill ITR 1 or ITR2. We decode ITR 1 in detail, besides explaining some jargon you would need to understand when filling ITR 2.