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.
| Return Period | GSTR-1 Due Date |
|---|---|
| April 2026 | 11th May 2026 |
| May 2026 | 11th June 2026 |
| June 2026 | 11th July 2026 |
| July 2026 | 11th August 2026 |
| August 2026 | 11th September 2026 |
| September 2026 | 11th October 2026 |
| October 2026 | 11th November 2026 |
| November 2026 | 11th December 2026 |
| December 2026 | 11th January 2027 |
| January 2027 | 11th February 2027 |
| February 2027 | 11th March 2027 |
| March 2027 | 11th April 2027 |
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.
| Return Period | GSTR-3B Due Date |
|---|---|
| April 2026 | 20th May 2026 |
| May 2026 | 20th June 2026 |
| June 2026 | 20th July 2026 |
| July 2026 | 20th August 2026 |
| August 2026 | 20th September 2026 |
| September 2026 | 20th October 2026 |
| October 2026 | 20th November 2026 |
| November 2026 | 20th December 2026 |
| December 2026 | 20th January 2027 |
| January 2027 | 20th February 2027 |
| February 2027 | 20th March 2027 |
| March 2027 | 20th April 2027 |
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
| Quarter | Period | GSTR-1 Due | GSTR-3B Due |
|---|---|---|---|
| Q1 | Apr–Jun 2026 | 13th Jul 2026 | 22nd/24th Jul 2026 |
| Q2 | Jul–Sep 2026 | 13th Oct 2026 | 22nd/24th Oct 2026 |
| Q3 | Oct–Dec 2026 | 13th Jan 2027 | 22nd/24th Jan 2027 |
| Q4 | Jan–Mar 2027 | 13th Apr 2027 | 22nd/24th Apr 2027 |
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
| Quarter | Period | CMP-08 Due Date |
|---|---|---|
| Q1 | Apr–Jun 2026 | 18th July 2026 |
| Q2 | Jul–Sep 2026 | 18th October 2026 |
| Q3 | Oct–Dec 2026 | 18th January 2027 |
| Q4 | Jan–Mar 2027 | 18th April 2027 |
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
- Set calendar reminders at least 5 days before each due date
- Use automated GST tools that send deadline alerts
- File early — don't wait until the last date
- 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.
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