08 October 2012
ER-5 Yearly 30th April Annual return of information relating to principal inputs used in the manufacture of finished goods. Filed by manufacturers who paid duty of excise more than Rs. One crore in the preceding financial year
ER-7 30th April of the succeeding year
ER-6 Units paying More than 1 crore duty(CENVAT + PLA) Monthly By 10th of succeeding month