Central Excise Returns ER4, ER5, ER6 and ER7 no longer need to be filed as of April 1, 2016. Assessees can still file these returns for past periods in the Automated Central Excise System (ACES). A new annual return format will be notified by the Board and must be filed by November 30, 2016 according to new rules. Assessees should contact their jurisdictional range office for further clarification.