31 March 2012
You can retrieve the password by feeding acknowledgement number of any of earlier e-filed return by the taxpayer since A.Y. 2007-08.
In case do not ,send a email request from registered email-id, which you have entered in the registration profile, to validate@incometaxindia.gov.in having following details PAN, Name of the assessee as appearing in the PAN card, Date of Birth / Date of incorporation, Name of the Father as appearing in the PAN card Address Mobile number Registered email id. The ITD will send its response via email.