GST Return Filing Due Dates 2026: Complete GST Filing Calendar for Businesses

18 June 2026

 

Missing a GST return deadline in 2026 is no longer a small compliance mistake. Late filing can trigger immediate daily penalties, high interest charges, blocked e-way bills, Input Tax Credit (ITC) mismatches, and even GST cancellation notices. For many businesses, especially startups and small companies, major tax hurdles begin with just one missed filing date.

The challenge is that GST compliance in India involves multiple returns, different frequencies, and separate rules for regular taxpayers, QRMP taxpayers, composition dealers, and e-commerce sellers. GSTR-1, GSTR-3B, GSTR-9, CMP-08 and GSTR-4 all follow different schedules, making it difficult to track deadlines without a proper system.

This comprehensive guide explains all the critical GST return filing due dates for FY 2026–27, who needs to file which return, late filing penalties, and how businesses can stay compliant.

What is GST Return Filing?

GST return filing is the process of reporting sales (outward supplies), purchases (inward supplies), tax collected, Input Tax Credit (ITC) and tax payments to the government through the official GST portal.

Every GST-registered business must file these returns within the prescribed due dates, even if there were no business transactions (Nil Return) during that period.

What Does the Government Track Through GST Returns?

  • Outward supplies (Sales)
  • Inward supplies (Purchases)
  • Final tax liability
  • Input Tax Credit (ITC) claims
  • E-way bill data alignment
  • Invoice matching (GSTR-2B)

New to Compliance? If your business is not yet registered under GST, it is critical to complete your GST Registration first to align your compliance calendar correctly.

Important GST Return Due Dates 2026 (FY 2026–27)

1. GSTR-1 Due Date (Outward Supplies / Sales)

GSTR-1 contains details of all sales invoices, debit notes, credit notes, and outward supplies.

  • Monthly Filers: 11th of the next month.
  • QRMP Quarterly Filers: 13th of the month following the end of the quarter.

Example: For April 2026, a monthly filer must submit GSTR-1 on or before 11 May 2026. Delayed filing will prevent your buyers from claiming their rightful ITC on time.

2. GSTR-3B Due Date (Summary Return & Tax Payment)

GSTR-3B is the core monthly or quarterly summary return where businesses declare their final tax liability, claim ITC, and pay the due taxes.

  • Monthly Filers: 20th of the next month.
  • QRMP Quarterly Taxpayers: Due dates are split by state categories to reduce server load.
Category Due Date Applicable States & Union Territories
Category X 22nd of the month following the quarter Chhattisgarh, Madhya Pradesh, Gujarat, Maharashtra, Karnataka, Goa, Kerala, Tamil Nadu, Andhra Pradesh, Telangana, operational UTs of Diu & Daman, Dadra & Nagar Haveli, Lakshadweep, and Puducherry.
Category Y 24th of the month following the quarter Jammu & Kashmir, Himachal Pradesh, Punjab, Uttarakhand, Haryana, Rajasthan, Uttar Pradesh, Bihar, West Bengal, Odisha, Sikkim, Arunachal Pradesh, Nagaland, Manipur, Mizoram, Tripura, Meghalaya, Assam, Jharkhand, UTs of Chandigarh, Ladakh, Andaman & Nicobar Islands, and New Delhi.

3. CMP-08 Due Date (Composition Scheme Statement)

Composition taxpayers do not file detailed monthly returns. Instead, they file a quarterly statement called CMP-08 to declare self-assessed tax.

  • Due Date: 18th of the month following the end of the quarter.
  • Applicable For: Small businesses and dealers registered under the GST Composition Scheme.

4. GSTR-4 Due Date (Annual Composition Return)

This is the mandatory annual return for taxpayers enrolled in the Composition Scheme.

Due Date: 30th April following the end of the financial year.

5. GSTR-9 Annual Return Due Date (Regular Taxpayers)

GSTR-9 is the annual GST return filed by regular taxpayers to consolidate their monthly/quarterly filings.

Due Date: 31st December following the end of the financial year.

Master GST Return Filing Calendar 2026

GST Return Form Applicable Taxpayers Filing Frequency Standard Due Date Deadline
GSTR-1 Regular Taxpayers Monthly / Quarterly 11th / 13th of the next month
GSTR-3B Regular Taxpayers Monthly / Quarterly 20th / 22nd / 24th of the next month
CMP-08 Composition Dealers Quarterly 18th of the month following the quarter
GSTR-4 Composition Dealers Annual 30th April following the FY
GSTR-9 Regular Taxpayers Annual 31st December following the FY

Late Fees and Penalties for Missing GST Due Dates

Failing to meet deadlines triggers immediate financial penalties and automatic interest calculations on the GST portal.

Daily Late Fees

  • Regular/Taxable Returns: ₹50 per day (₹25 CGST + ₹25 SGST) from the due date until filed.
  • Nil Returns (No Business Activity): ₹20 per day (₹10 CGST + ₹10 SGST).

Interest on Delayed Tax Payments

If you have an active tax liability and fail to pay it before the GSTR-3B due date:

  • An 18% annual interest rate applies to the net cash tax liability.
  • Interest is calculated on a daily basis from the exact day following the due date until the tax is paid.

What Happens If You Don't File GST Returns?

Continuous delay or avoidance of GST filing leads to strict departmental actions:

  • Departmental GST Notices: The tax department triggers automated compliance or mismatch notices (such as ASMT and DRC notices).
  • E-Way Bill Blocking: The portal automatically blocks your ability to generate E-Way bills if returns are missed for two consecutive terms, halting physical goods transportation.
  • Suspension of GSTIN: Long-term non-filing leads to systemic suspension, followed by permanent GST Cancellation proceedings by authorities.
  • ITC Mismatch for Buyers: Your sales invoices won't reflect in your client's GSTR-2B. Consequently, buyers will stop doing business with you to avoid losing their input credits.

Monthly vs Quarterly GST Filing (The QRMP Scheme)

The Quarterly Return Monthly Payment (QRMP) scheme is designed to lower the administrative burden on smaller enterprises.

  • Eligibility Criteria: Registered regular taxpayers with an aggregate annual turnover of up to ₹5 Crore in the preceding financial year.
  • Core Benefit: Reduces compliance overhead from 24 returns down to just 8 returns per year.
  • Important Catch: While return filing happens quarterly under QRMP, tax payments must still be calculated and deposited monthly using the PMT-06 challan.

Checklist: Documents Required for Accurate GST Filing

To ensure zero errors and clean cross-matching with the portal, maintain these records monthly:

  • Sales Invoices & Credit/Debit notes
  • Purchase Invoices with valid vendor GSTINs
  • Generated E-Way bills
  • Monthly Bank Statements
  • Internal ITC Reconciliation Reports (Books vs GSTR-2B data)

Common GST Filing Mistakes to Avoid

  • GSTR-1 and GSTR-3B Mismatch: Unmatched figures between these two returns trigger automatic notices under Rule 88C.
  • Excessive ITC Claims: Claiming input credits that are not visibly updated in your auto-populated GSTR-2B will invite scrutiny.
  • Neglecting Nil Returns: Forgetting that "No Sales = Mandatory Nil Return Filing" is one of the most common reasons small firms pile up thousands in late fees.
  • Incorrect HSN/SAC Codes: Wrongly coded inventory causes data errors during annual audits.

Frequently Asked Questions (FAQs)

What is the due date for GSTR-3B in 2026?

For monthly filers, it is the 20th of the following month. For QRMP quarterly filers, it is either the 22nd or 24th of the month following the quarter, depending entirely on which Indian state your business operates in.

Is GST return filing mandatory for Nil returns?

Yes, filing is absolutely mandatory. Even if your business had zero transactions or remained paused during a month, a Nil return must be submitted on time to avoid daily late fees.

Can GST returns be revised after submission?

No, filed GST returns cannot be directly edited or revised in India. Any corrections, omissions, or adjustments must be declared and settled in the return forms of the subsequent tax period.

Conclusion

GST return filing in 2026 is a critical driver of your business's credit credibility and operational continuity. Consistently keeping up with deadlines prevents unnecessary out-of-pocket penalty costs, strengthens vendor trust via seamless ITC flow, and ensures your company remains fully compliant with India's tax laws.

If you find yourself handling complex business changes, updating data, or facing unexpected filings, remember to execute a formal GST Amendment immediately to keep your tax profile completely accurate.