The Complete GST Compliance Calendar 2026: Never Miss a Return Filing Deadline

GST Compliance Calendar 2026-27: Master Your Due Dates #

Failing to file your GST returns on time can lead to severe financial penalties, late fees of up to ₹50 per day (₹20 for NIL returns), interest on unpaid tax at 18% per annum, and suspension of your GSTIN.

Here is your authoritative calendar for the financial year.

1. Monthly Recurring GST Due Dates #

For regular taxpayers with turnover exceeding ₹5 Crores (or those opting for monthly filing):

• 11th of Every Month: GSTR-1 (Details of Outward Supplies of Goods or Services).
• 13th of Every Month: IFF (Invoice Furnishing Facility) for QRMP scheme taxpayers.
• 20th of Every Month: GSTR-3B (Summary return and tax liability payment for Category 1 States).
• 22nd / 24th of Every Month: GSTR-3B for Category 2 States and QRMP quarterly filers.

2. Quarterly Filing Deadlines (QRMP Scheme) #

Taxpayers with an aggregate turnover up to ₹5 Crores who opted for the Quarterly Return Monthly Payment (QRMP) scheme:

• Quarter 1 (Apr - Jun): GSTR-1 due on July 13; GSTR-3B due on July 22 / 24.
• Quarter 2 (Jul - Sep): GSTR-1 due on October 13; GSTR-3B due on October 22 / 24.
• Quarter 3 (Oct - Dec): GSTR-1 due on January 13; GSTR-3B due on January 22 / 24.
• Quarter 4 (Jan - Mar): GSTR-1 due on April 13; GSTR-3B due on April 22 / 24.

3. Annual Filing Due Dates #

• 31st December: GSTR-9 (Annual Return for regular taxpayers) and GSTR-9C (Reconciliation Statement for turnover > ₹5 Crores).
• 30th April: CMP-08 for Composition Scheme taxpayers.

4. Proactive Tips to Avoid Penalties #

1. 1
   Reconcile GSTR-2B with Purchase Register Monthly: Never claim Input Tax Credit (ITC) that does not reflect in your GSTR-2B.
2. 2
   Generate E-Invoices Immediately: Mandatory for B2B transactions if aggregate turnover exceeds ₹5 Crores.
3. 3
   Set Up Automated GST Alerts: Use Karan Consultancy's compliance dashboard to receive automated SMS and WhatsApp reminders 3 days before every statutory deadline.