e-FILING Calendar When: September 13, 2018 all-day 2018-09-13T00:00:00+08:00 2018-09-14T00:00:00+08:00 e-FILING LAST DAY OF e-FILING BIR Forms No. 1601C, 1601E, 1601F and 1602 for August 2018 (eFPS filers under Group C) Posted in .