Last date for filing of Individual tax returns for financial year 2014 - 15 is July 31, 2015.

ITR 1, ITR 2 & ITR 4S where returned income is greater than 5 Lakhs or where Refund is claimed and ITR 3, ITR 4, ITR 5, ITR 6 & ITR 7 are mandatorily required to be eFiled. EVC (Electronic Verification Code) has been included as a mode for verification of eFiled return.

For more details, refer to the below notification.
https://incometaxindiaefiling.gov.in/eFiling/Portal/StaticPDF/notification41_2015.pdf