GSTR-3B Due Date October 2026: September Return on 20 Oct, QRMP on 22/24 Oct, and the Dussehra Point
GSTR-3B September 2026: monthly filers due 20 Oct, QRMP filers 22 or 24 Oct by state group. 20 Oct is Dussehra – but the statutory date is not extended.