When is Form 5500 due? Form 5500 is due on the last day of the seventh month following the plan year. A one time 2 1/2 month extension can be requested by filing Form 5558. By BC2|2023-06-08T21:10:13-04:00June 8, 2023|Faq|0 Comments Share This Story, Choose Your Platform! FacebookXLinkedIn