GSTR-3B Missed Deadline (September 2026): Late Fee, 18% Interest & the 57th Council Waiver
September 2026 GSTR-3B was due 20 October. Missed it? This guide covers the Rs 50/day late fee, 18% interest on net cash liability, the 57th GST Council waiver status, and a 4-step action plan to get compliant today.