GST Return Filing Calendar 2026–27: GSTR-1, GSTR-3B, GSTR-9 Due Dates for MSMEs
For Micro, Small, and Medium Enterprises (MSMEs) driving the engine of the Indian economy, staying ahead of statutory compliance is not just a legal obligation—it is a core pillar of financial survival. Missing a single Goods and Services Tax (GST) deadline can trigger cascading effects: blocked Input Tax Credit (ITC) for your B2B buyers, mounting late fees, high interest charges under Section 50, and automated system restrictions on generating e-way bills.
Navigating the complex maze of GST return forms, turnover thresholds, and staggered due dates requires absolute clarity. This exhaustive guide breaks down the GST Return Filing Calendar 2026–27, focusing exclusively on what MSMEs, small business owners, and startup founders need to know about GSTR-1, GSTR-3B, GSTR-4, CMP-08, and GSTR-9.
Understanding the MSME Classification & GST Applicability
Before diving into calendar dates, let us establish who qualifies as an MSME under the current framework and how GST registration thresholds apply:
The Registration Threshold: Businesses with an aggregate annual turnover exceeding ₹40 Lakhs for goods suppliers (₹20 Lakhs for service providers in most states) must mandatorily register under GST. For special category states, lower thresholds apply (₹20 Lakhs/₹10 Lakhs).
The QRMP Scheme Lifeline for MSMEs: To reduce compliance friction, the Central Board of Indirect Taxes and Customs (CBIC) offers the Quarterly Return Monthly Payment (QRMP) scheme for taxpayers with an aggregate annual turnover of up to ₹5 Crores. Under this scheme, MSMEs file returns quarterly while discharging tax liability monthly through PMT-06 challans.
Core GST Return Forms: What Every MSME Must File
To maintain a clean compliance record, MSMEs generally interact with four key return categories:
GSTR-1 (Outward Supplies): Details of all B2B and large B2C invoices issued by the supplier. Filed either monthly (turnover > ₹5 Cr or voluntary) or quarterly via the QRMP scheme using the Invoice Furnishing Facility (IFF).
GSTR-3B (Summary Return & Tax Payment): A self-declared summary return where total outward supplies, inward supplies attracting reverse charge, ITC claims, and net tax payable are declared and settled.
CMP-08 / GSTR-4 (Composition Scheme): Simplified quarterly statement-cum-challan (CMP-08) for small taxpayers under the Composition Scheme, followed by an annual return (GSTR-4).
GSTR-9 & GSTR-9C (Annual Compliance): Annual consolidation of all monthly/quarterly returns filed during the financial year, mandatory for regular taxpayers whose aggregate turnover crosses statutory limits.
Detailed GST Return Filing Calendar for FY 2026–27
Part A: GSTR-1 Due Dates (Outward Supplies)
The filing schedule for GSTR-1 depends entirely on whether your aggregate annual turnover exceeds ₹1.5 Crores or if you have opted for the QRMP scheme.
1. Monthly GSTR-1 (Turnover > ₹1.5 Crores or Normal Monthly Filers)
Due Date: Eleventh ($11^\text{th}$) day of the succeeding month.
Example: For September 2026 sales, the due date is October 11, 2026. For October 2026 sales, the due date is November 11, 2026.
2. Quarterly GSTR-1 under QRMP Scheme (Turnover up to ₹5 Crores)
Due Date: Thirteenth ($13^\text{th}$) day of the month succeeding the quarter.
Q1 (April – June 2026): July 13, 2026
Q2 (July – September 2026): October 13, 2026
Q3 (October – December 2026): January 13, 2027
Q4 (January – March 2027): April 13, 2027
Pro-Tip on IFF (Invoice Furnishing Facility): QRMP taxpayers can upload their B2B invoices in the first two months of a quarter using the optional IFF facility by the $13^\text{th}$ of the following month, ensuring their buyers can claim matching Input Tax Credit immediately without waiting for quarter-end.
Part B: GSTR-3B Due Dates (Summary Return & Tax Payment)
GSTR-3B filing follows a staggered structure based on annual turnover and the state/union territory where the business is registered. This prevents system server bottlenecks on the GST portal.
1. Large Taxpayers (Turnover > ₹5 Crores in Previous Financial Year)
Filing Frequency: Monthly
Due Date: Twentieth ($20^\text{th}$) of the succeeding month.
Example: September 2026 GSTR-3B is due on October 20, 2026.
2. MSMEs with Turnover up to ₹5 Crores (Monthly Filers)
Due Date: Twentieth ($20^\text{th}$) of the succeeding month.
3. MSMEs under QRMP Scheme (Quarterly GSTR-3B Filers)
For MSMEs filing quarterly, the due date falls on the $22^\text{nd}$ or $24^\text{th}$ of the month following the quarter, categorized by state groups:
Category-1 States ($22^\text{nd}$ of the month following quarter): Chhattisgarh, Madhya Pradesh, Gujarat, Daman and Diu, Dadra and Nagar Haveli, Maharashtra, Karnataka, Goa, Kerala, Tamil Nadu, Telangana, Andhra Pradesh, Andaman and Nicobar Islands, Lakshadweep, and Puducherry.
Q2 (July–September 2026) Due Date: October 22, 2026
Q3 (October–December 2026) Due Date: January 22, 2027
Category-2 States ($24^\text{th}$ of the month following quarter): Himachal Pradesh, Punjab, Chandigarh, Uttarakhand, Haryana, Rajasthan, Uttar Pradesh, Bihar, Sikkim, Arunachal Pradesh, Nagaland, Manipur, Mizoram, Tripura, Meghalaya, Assam, West Bengal, Jharkhand, and Odisha.
Q2 (July–September 2026) Due Date: October 24, 2026
Q3 (October–December 2026) Due Date: January 24, 2027
Part C: Composition Scheme Due Dates (CMP-08 & GSTR-4)
For micro-enterprises registered under the Composition Levy Scheme (turnover up to ₹1.5 Crores with lower tax rates and no ITC benefits):
Form CMP-08 (Quarterly Statement-cum-Challan for Tax Payment):
Q1 (Apr–Jun 2026): July 18, 2026
Q2 (Jul–Sep 2026): October 18, 2026
Q3 (Oct–Dec 2026): January 18, 2027
Q4 (Jan–Mar 2027): April 18, 2027
Form GSTR-4 (Annual Return for Composition Dealers):
Due Date for FY 2025–26: April 30, 2026
Part D: Annual Returns (GSTR-9 and GSTR-9C)
Annual compliance wraps up the financial year by reconciling all monthly/quarterly statements with audited financial statements.
GSTR-9 (Annual Return): Mandatory for all regular registered taxpayers whose aggregate turnover exceeds ₹2 Crores.
Due Date for FY 2025–26: December 31, 2026
GSTR-9C (Reconciliation Statement & Self-Certified Audit): Mandatory for taxpayers with an aggregate turnover exceeding ₹5 Crores.
Due Date for FY 2025–26: December 31, 2026
Comprehensive Master Table: GST Return Due Dates 2026–27
| Return Form | Purpose | Applicable Taxpayer | Filing Frequency | Due Date Reference |
| GSTR-1 | Outward Supplies (Sales) | Turnover > ₹1.5 Cr | Monthly | $11^\text{th}$ of next month |
| GSTR-1 (QRMP) | Outward Supplies (Sales) | Turnover up to ₹5 Cr | Quarterly | $13^\text{th}$ of month post-quarter |
| GSTR-3B | Summary Return & Tax Payment | Turnover > ₹5 Cr | Monthly | $20^\text{th}$ of next month |
| GSTR-3B (QRMP) | Summary Tax Payment | Turnover up to ₹5 Cr | Quarterly | $22^\text{nd}$ or $24^\text{th}$ post-quarter |
| CMP-08 | Tax Payment Statement | Composition Dealers | Quarterly | $18^\text{th}$ of month post-quarter |
| GSTR-4 | Annual Return | Composition Dealers | Annually | April 30 of next FY |
| GSTR-9 | Annual Return Summary | Regular Taxpayers | Annually | December 31 of next FY |
| GSTR-9C | Audit & Reconciliation | Turnover > ₹5 Cr | Annually | December 31 of next FY |
Penalties, Late Fees, and Interest for Non-Compliance
Failing to meet GST return deadlines triggers statutory penalties under the Central Goods and Services Tax (CGST) and State Goods and Services Tax (SGST) Acts:
Late Fees (Section 47):
For GSTR-1 and GSTR-3B: ₹50 per day (₹25 CGST + ₹25 SGST) for active returns, capped at maximum limits based on turnover. For NIL returns, it is reduced to ₹20 per day.
For GSTR-9 Annual Return: ₹200 per day (₹100 CGST + ₹100 SGST).
Interest on Delayed Tax Payment (Section 50):
An interest rate of 18% per annum is charged on net cash tax liability for delayed payments, calculated day-by-day from the due date until the actual date of payment.
E-Way Bill Blocking:
Under Rule 138E, if a taxpayer fails to file GSTR-3B or GSTR-1 for two consecutive reporting periods, the system automatically blocks e-way bill generation, crippling business logistics and supply chains.
Best Practices for MSMEs to Avoid GST Notices
Reconcile GSTR-2B with Purchase Registers Monthly: Never claim Input Tax Credit (ITC) blindly. Ensure that your purchase ledger matches what suppliers have uploaded in their GSTR-1, reflecting in your GSTR-2B.
Automate Invoicing: Integrate cloud accounting and billing software that syncs directly with the GST portal via APIs to eliminate manual data entry errors.
Keep Cash Flow Reserves: Set aside GST collected from customers immediately in a separate sub-account so that tax payments on the $20^\text{th}$ or quarterly dates never strain operational liquidity.
Frequently Asked Questions (FAQs)
Q1. Is GSTR-3B due on the same date for all MSMEs across India?
No. While monthly filers face a uniform deadline of the $20^\text{th}$, quarterly QRMP filers have staggered deadlines on the $22^\text{nd}$ or $24^\text{th}$ depending on their registered state jurisdiction.
Q2. What happens if I miss filing GSTR-1 on time?
Aside from late fees of ₹50 per day, your customer will not see those invoices reflected in their GSTR-2B, which will cause them to delay payments or cut your ITC claims, damaging business relationships.
Q3. Can I revise a GST return after submission?
No, India’s GST portal does not currently support the revision of filed returns. Errors or omissions made in a return must be rectified in the subsequent month or quarter’s return through adjustments.
Disclaimer: This article is for general informational and educational purposes only and does not constitute professional chartered accountancy or legal advice. Tax regulations are subject to statutory amendments notified by the CBIC.
