25 December 2011
First, get the assessee registered on www.incometaxindiaefiling.gov.in by providing required details. You will get a confirmation mail in the email ID mentioned therein that you are registered. Next, fill the applicable ITR and generate XML file. Next, Log-in on www.incometaxindiaefiling.gov.in by providing User-ID and password. Upload your XML file over there. You are done. Print ITR-V (Acknowledgement), sign it and post it to the address given therein.
If the assessee is not a Company, firm or tax audit assessee, then digital sign is not required.