The present disclosure relates to a seat arrangement (1) for an electrically powered wheelchair, wherein the seat arrangement comprises (1): a mounting arrangement for mounting the seat arrangement (1) to a chassis of an electrically powered wheelchair, a seat frame (3), a backrest frame (5), a backrest actuator (7), wherein the backrest frame (5) is pivotally coupled to the seat frame (3), forming a first pivot axis (A1), and wherein the backrest frame (5) is pivotally coupled to the backrest actuator (7), forming a translatable second pivot axis (A2), a retaining mechanism (11) arranged to retain the backrest frame (5) in an upright position while the backrest frame (5) is subjected to a forward-tilting force smaller than a threshold value, wherein the retaining mechanism (11) is arranged to allow movement of the backrest frame (5) to a forward-tilted position when the backrest frame (5) is subjected to a forward-tilting force equal to or greater than the threshold value, and a locking mechanism (13) arranged to lock the backrest frame (5) in the forward-tilted position. An electrically powered wheelchair comprising a seat arrangement is also disclosed herein.