1. Check your PAN card and the PAN the you propose to use.
2. Go to the site www.incometaxindia.gov.in and check your PAN and the jurisdiction of your Officer.
3. Prepare your Balance Sheet or Statement of affairs, even if you are not mandatorily required to do so. It helps check whether every aspect of what should comprise of your computation goes into it or not.
4. Prepare your Bank account Summary and cross check the same with your Statement of Affairs.
5 Prepare the computation of Income.
6. check Statement AS26 recd from department or obtain the same from the website www.tin-nsdl.com to check whether taxes deducted by others are reflected therein or not, the credit for advance taxes paid by you and any other taxes paid by you.
7. fill up form applicable to you with the help of return facility available on site www.incometaxindia.gov.in.