GST Filing Deadlines 2026: Complete Calendar — Never Miss a Date!

Missing a GST return deadline can cost you late fees of ₹50 per day (₹20 per day for nil returns), input tax credit loss, and even suspension of your GSTIN. This comprehensive calendar covers all GST return deadlines for 2026 so you never pay unnecessary penalties.

Types of GST Returns You Need to File

GSTR-1 — Outward Supplies

Details of all sales/outward supplies made during the month or quarter. Buyers can claim Input Tax Credit (ITC) only if your GSTR-1 is filed correctly and on time.

• Monthly filers (turnover above ₹5 crore): Due by 11th of next month
• Quarterly filers (QRMP scheme, turnover up to ₹5 crore): Due by 13th of month after quarter end

GSTR-3B — Summary Return & Tax Payment

A summary return showing total sales, ITC claimed, and net tax liability. Tax must be paid when filing this return.

• Monthly filers: Due by 20th of next month
• Quarterly filers (QRMP): Due by 22nd/24th of month after quarter (varies by state)

GSTR-9 — Annual Return

Comprehensive annual return consolidating all monthly/quarterly returns. Filed once a year.

• Due date: December 31st of the following financial year (e.g., for FY 2025-26, due December 31, 2026)
• Mandatory for taxpayers with annual turnover above ₹2 crore

GSTR-9C — Reconciliation Statement

A reconciliation statement between annual returns and audited financial statements. Mandatory for taxpayers with annual turnover above ₹5 crore.

Monthly GST Deadlines Calendar 2026

📅 January 2026

• Jan 11: GSTR-1 for December 2025 (monthly filers)
• Jan 13: GSTR-1 for Oct-Dec 2025 quarter (quarterly filers)
• Jan 20: GSTR-3B for December 2025 (monthly filers)
• Jan 22/24: GSTR-3B for Oct-Dec 2025 quarter (quarterly filers)

📅 February 2026

• Feb 11: GSTR-1 for January 2026
• Feb 20: GSTR-3B for January 2026

📅 March 2026

• Mar 11: GSTR-1 for February 2026
• Mar 20: GSTR-3B for February 2026

📅 April 2026

• Apr 11: GSTR-1 for March 2026 (monthly filers)
• Apr 13: GSTR-1 for Jan-Mar 2026 quarter (quarterly filers)
• Apr 20: GSTR-3B for March 2026 (monthly filers)
• Apr 22/24: GSTR-3B for Jan-Mar 2026 quarter (quarterly filers)

📅 May 2026

• May 11: GSTR-1 for April 2026
• May 20: GSTR-3B for April 2026

📅 June 2026

• Jun 11: GSTR-1 for May 2026
• Jun 20: GSTR-3B for May 2026

📅 July 2026

• Jul 11: GSTR-1 for June 2026 (monthly filers)
• Jul 13: GSTR-1 for Apr-Jun 2026 quarter (quarterly filers)
• Jul 20: GSTR-3B for June 2026 (monthly filers)
• Jul 22/24: GSTR-3B for Apr-Jun 2026 quarter (quarterly filers)

📅 August 2026

• Aug 11: GSTR-1 for July 2026
• Aug 20: GSTR-3B for July 2026

📅 September 2026

• Sep 11: GSTR-1 for August 2026
• Sep 20: GSTR-3B for August 2026

📅 October 2026

• Oct 11: GSTR-1 for September 2026 (monthly filers)
• Oct 13: GSTR-1 for Jul-Sep 2026 quarter (quarterly filers)
• Oct 20: GSTR-3B for September 2026 (monthly filers)
• Oct 22/24: GSTR-3B for Jul-Sep 2026 quarter (quarterly filers)

📅 November 2026

• Nov 11: GSTR-1 for October 2026
• Nov 20: GSTR-3B for October 2026

📅 December 2026

• Dec 11: GSTR-1 for November 2026
• Dec 20: GSTR-3B for November 2026
• Dec 31: GSTR-9 Annual Return for FY 2024-25

Late Filing Penalties

• GSTR-1 late fee: ₹50/day (₹25 CGST + ₹25 SGST), maximum ₹10,000
• GSTR-3B late fee: ₹50/day for returns with tax liability; ₹20/day for nil returns
• Interest on late tax payment: 18% per annum on the unpaid tax amount
• GSTR-9 late fee: ₹200/day, maximum ₹10,000

The QRMP Scheme — Should You Opt In?

The Quarterly Return Monthly Payment (QRMP) scheme allows small taxpayers (turnover up to ₹5 crore) to file GSTR-1 and GSTR-3B quarterly instead of monthly, while paying tax monthly using a simplified challan (PMT-06). This reduces compliance burden without increasing tax payment delays.