Top GST Tasks for March 2026 — Preparing for FY 2026-27

Key GST Actions — March 2026

• 1

  Billing Series ResetFrom 1 Apr 2026
  Initiate a new and unique billing series for FY 2026-27 starting from April 1, 2026. This applies to sale invoices, debit notes, credit notes, and RCM self-invoices for unregistered suppliers. The billing series must be distinct from FY 2025-26 to avoid duplication and compliance issues.
• 2

  LUT Renewal / FilingDeadline: 31 Mar 2026
  Taxpayers must apply for a Letter of Undertaking (LUT) in Form GST RFD-11 for FY 2026-27 to undertake export of goods/services or supplies to SEZs without payment of GST. The deadline for furnishing the LUT is March 31, 2026. Non-compliance may lead to severe penalties, so immediate action is required to initiate a fresh LUT or renew the existing one.
• 3

  E-Invoice ComplianceOngoing
  GST taxpayers with aggregate turnover exceeding ₹5 crore in any financial year from 2017-2018 to 2025-2026 are required to generate e-invoices. Effective April 1, 2025, taxpayers with AATO of ₹10 crore and above must generate e-invoices within 30 days from the invoice date. The IRP will not accept e-invoices older than 30 days. Ensure timely e-invoice generation to avoid penalties.
• 4

  GST Certificate AmendmentsWithin 15 Days
  Registered persons must inform the proper officer about any changes in registration information — including legal name, principal place of business, additional places of business, or changes in directors, partners, or authorized representatives — within fifteen days of such changes. Review and update GST registration details before the year-end.
• 5

  Composition Scheme OptionDeadline: 31 Mar 2026
  Eligible taxpayers (goods: turnover up to ₹1.50 crore; services: up to ₹50 lakhs) can opt for the Composition Scheme for FY 2026-27 using Form GST CMP-02 by March 31, 2026. Navigate to: Services → Registration → Application to Opt for Composition Levy on the GST portal.
• 6

  QRMP Scheme ElectionDeadline: 30 Apr 2026
  Taxpayers with aggregate turnover at the PAN level up to ₹10 crore can opt for quarterly GSTR-1 and GSTR-3B filing with monthly payments (QRMP Scheme) for FY 2026-27. The deadline to opt for the QRMP Scheme is April 30, 2026.
• 7

  ISD & Cross-Charge ReviewApril 2026
  Multi-location entities must analyse the applicability of ISD (Input Service Distributor) and cross-charge mechanisms. ISD registration, if applicable, must be mandatorily obtained. Also update systems if any vendor has updated their ISD GST number from a regular GST number.
• 8

  HSN/SAC Code ReviewFrom 1 Apr 2026
  Examine the list of applicable HSN/SAC codes and update on the GST portal for FY 2026-27. The number of digits required depends on the preceding year's aggregate turnover: up to ₹5 crore = 4 digits; more than ₹5 crore = 6 digits. Review and confirm the correct digit requirement based on FY 2025-26 turnover.
• 9

  Aadhaar AuthenticationBefore Filing
  Aadhaar authentication is mandatory for filing refund applications under Rules 89 and 96 of the CGST Rules, and for filing applications for revocation of cancellation under Rule 23. If authentication of the authorized signatory (Proprietor/Partner/Director) is pending, complete it at the earliest to avoid refund processing delays.