The 30-year-old joined the Clarets in 2016 after his contract at Bromley was terminated.
Porter embedded himself into the City squad last season, scoring twice in his 30 appearances for Chelmsford.
Having missed out on promotion to the Vanarama National League, Porter remained a Claret but injuries meant the former Barnet and Newport County midfielder found first-team chances at a premium during the 2017-18 campaign as he made only thirteen appearances.
Therefore, Porter was sent on-loan to Essex neighbours Maldon & Tiptree in order to gain game time.
The midfielder was recalled for the final few Vanarama National League South matches following an injury to Taylor Miles.
While Porter has agreed terms to play for the Clarets for the 2018-19 season, he will also join City boss Rod Stringer, Nick Haycock and Tony Fenn in the dugouts after accepting a coaching role with Chelmsford City.
Everyone at Chelmsford City Football Club is pleased to hear of the retention of Max Porter’s services.
Updated 15:31 - 16 May 2018 by Matt Lee