Compliance Calendar October 2026 – GST, TDS, Income Tax & ROC Due Dates 03 Oct 2026 Arpan Bohra and Co Compliance Calendar Comments Off on Compliance Calendar October 2026 – GST, TDS, Income Tax & ROC Due Dates Compliance Calendar October 2026: GST (GSTR-1, GSTR-3B, CMP-08), TDS/TCS, tax audit (extended to 21 Oct), AOC-4, ADT-1, LLP Form 8 and MSME-1 due dates.