Some communities are accustomed not to say Tachanun in the presence of a Bar Mitzvah boy on the day of his Bar Mitzvah, and so is the widespread Sefaradic custom in Eretz Yisrael. Other communities are accustomed to recite Tachanun on the day of the Bar Mitzvah, and so is the widespread Ashkenazi customs and so is the Chabad custom.
 Custom of Egyptian Jewry, brought in Nehar Mitzrayim, Ketzos Hashulchan 24 footnote 19; Yabia Omer 1/27; 4/14; Yechaveh Daas 2/15; Yaskil Avdi 2/15; Mishpitei Uziel 11; See Piskeiy Teshuvos 131/24 footnote 141
 Az Nidbaru 11/40; See Piskeiy Teshuvos ibid
Chassidic custom: Some Chassidic communities do not recite Tachanun on the day of the Bar Mitzvah. [Darkei Chaim Veshalom 192]