GST Filing Due Dates 2026-27: Complete Calendar for Indian Businesses

Every Indian business registered under GST must file returns on time — or face steep penalties. Missing even one deadline can trigger late fees, interest charges, and even block your e-way bill generation. This complete GST filing calendar for FY 2026-27 covers every return type, every deadline, and every penalty you need to know.

Monthly GST Return Due Dates (GSTR-1 and GSTR-3B)

For businesses with an annual turnover above ₹5 crore, monthly filing is mandatory. Here are the standard due dates that apply every single month from April 2026 to March 2027:

GSTR-1 — Outward Supply Return

Due Date: 11th of the following month

GSTR-1 captures all your outward supplies (sales). Whether you sell goods or provide services, every B2B and B2C invoice must be reported here.

GSTR-3B — Summary Return with Tax Payment

Due Date: 20th of the following month

GSTR-3B is your summary return where you declare your tax liability, claim input tax credit (ITC), and pay the net GST due.

Quarterly Filing Under QRMP Scheme

Businesses with turnover up to ₹5 crore can opt for the QRMP (Quarterly Return with Monthly Payment) scheme. Under QRMP:

• GSTR-1 (Quarterly): Due on the 13th of the month following each quarter
• GSTR-3B (Quarterly): Due on the 22nd or 24th of the month following each quarter (state-dependent)
• PMT-06 (Monthly Tax Payment): Due on the 25th of each month within the quarter
• IFF (Invoice Furnishing Facility): Optional, due on the 13th of each month within the quarter

Annual Returns — GSTR-9 and GSTR-9C

• GSTR-9 (Annual Return): Due by 31st December 2026 for FY 2025-26. Mandatory for all regular taxpayers with turnover above ₹2 crore.
• GSTR-9C (Reconciliation Statement): Due by 31st December 2026 for FY 2025-26. Required for taxpayers with turnover above ₹5 crore — a self-certified reconciliation between audited financial statements and GST returns.

Composition Scheme — CMP-08

Composition dealers file CMP-08 quarterly instead of GSTR-1 and GSTR-3B.

Due Date: 18th of the month following each quarter

Other Important GST Due Dates 2026-27

• GSTR-7 (TDS Return): 10th of the following month
• GSTR-8 (TCS Return by e-commerce): 10th of the following month
• GSTR-5 (Non-Resident Taxable Person): 20th of the following month
• GSTR-6 (Input Service Distributor): 13th of the following month

Late Filing Penalties and Interest

Missing your GST filing due dates has serious consequences:

• Late fee for GSTR-1 and GSTR-3B: ₹50 per day (₹25 CGST + ₹25 SGST), capped at ₹10,000 per return
• Nil return late fee: ₹20 per day (₹10 CGST + ₹10 SGST)
• Interest on late tax payment: 18% per annum on the outstanding tax amount
• E-way bill blocked: After two consecutive missed GSTR-3B filings, your e-way bill generation is disabled
• GSTR-1 filing blocked if previous period GSTR-3B is not filed

How to Never Miss a GST Deadline

1. Set calendar reminders at least 5 days before each due date
2. Use automated GST tools that send deadline alerts
3. File early — don't wait until the last date
4. Keep your books updated throughout the month

Free GST Tools for Indian Businesses

Managing GST compliance shouldn't be complicated or expensive. DoAide's free GST tools help Indian businesses with:

• Free GST invoice generation — no login required
• GST calculation and rate finder
• GSTIN validation and verification
• Compliance tracking and reminders

Visit gst.doaide.com to simplify your GST compliance today — completely free, no sign-up needed.

This GST filing calendar for 2026-27 is compiled from official CBIC notifications. Always verify with the GST Portal for any changes or extensions announced by the government.