Are The Prostrations for Forgetfulness Done Before or After the Salaam?
by The Albaani Site
Questioner: A person catches one rak’ah of Fajr prayer, but he forgetfully gives salaam along with the Imaam, should the prostrations for forgetfulness be done before or after the salaam?
Al-Albaani: [Firstly] he doesn’t prostrate for forgetfulness until he has separated from the Imaam. When he forgets if he wants to he can prostrate before the salaam or after it, the well-known elaboration that if he added something to the prayer then it is … after and vice-versa, some of the hadiths serve as evidence for this elaboration but when all of them are brought together it becomes clear that the person who is forgetful in his prayer has the option of either giving salaam [and then prostrating] and that is better outright, or if he wants to he can give salaam after he finishes the prostrations for forgetfulness.
Al-Hudaa wan-Noor, 259.