GST Return Filing Due Dates 2026-27 — Complete Monthly Calendar

Why GST Return Filing Deadlines Matter for Your Business

If you run a small business in India, filing your GST returns on time isn’t just a legal requirement—it’s a financial lifeline. Miss a deadline, and you could face late fees, interest charges, or even a temporary suspension of your GST registration. For small businesses operating on tight margins, these penalties can quickly eat into profits.

In 2026-27, the GST regime continues to evolve, with new rules for e-invoicing and input tax credit (ITC) matching. Staying ahead of deadlines ensures you maintain a clean compliance record, which is crucial when applying for loans, tenders, or even expanding your business.

This guide breaks down every GST return filing due date for 2026-27, explains who needs to file what, and shares actionable tips to avoid common pitfalls. Bookmark this page and check back monthly—we’ll update it if the government announces any changes.

Understanding GST Return Types and Who Needs to File Them

Not all GST returns are the same. The type of return you file depends on your business model, turnover, and whether you’re registered under the regular scheme or the composition scheme. Here’s a quick breakdown:

If you’re unsure which return applies to you, check your GST registration certificate or consult a GST consultant. Filing the wrong return can lead to rejection and penalties.

Key Terms Explained

• GSTR-1: A monthly or quarterly return that lists all your outward supplies (sales). This is the foundation for your buyers to claim ITC.
• GSTR-3B: A summary return where you declare your total sales, ITC claimed, and tax paid. It’s the most common return for regular taxpayers.
• GSTR-4: A simplified annual return for businesses under the composition scheme, which pays tax at a fixed rate (e.g., 1% for manufacturers).
• Input Tax Credit (ITC): The tax you’ve paid on purchases that you can deduct from the tax you owe on sales. ITC matching is now stricter, so ensure your suppliers file GSTR-1 on time.

Monthly GST Return Filing Calendar for 2026-27 (Regular Taxpayers)

For businesses with an annual turnover exceeding ₹5 crore, GSTR-1 and GSTR-3B must be filed monthly. Here’s the exact due date calendar for 2026-27:

Note: For taxpayers with turnover ≤ ₹5 crore, GSTR-1 is filed quarterly. The due dates are the 13th of the month following the quarter-end (e.g., Q1 ends 30 June, so GSTR-1 is due 13 July).

Quarterly GST Return Filing for Small Businesses (Turnover ≤ ₹5 Crore)

Small businesses with a turnover of up to ₹5 crore can opt for the QRMP scheme (Quarterly Return Monthly Payment), which allows them to file GSTR-1 and GSTR-3B quarterly while paying tax monthly. This reduces compliance burden but requires careful cash flow planning.

QRMP Scheme: How It Works

The QRMP scheme is voluntary but beneficial for businesses with seasonal sales or irregular cash flows. Here’s what you need to know:

• You must opt in via the GST portal by the end of the first month of the quarter.
• Monthly tax payments (via challan) are due on the 25th of each month.
• GSTR-1 is filed quarterly (due 13th of the month after quarter-end).
• GSTR-3B is filed quarterly (due 22nd or 24th of the month after quarter-end, depending on your state).

For example, if you opt into QRMP for Q1 (April-June 2026):

• Monthly tax payments: 25 April, 25 May, 25 June 2026.
• GSTR-1 due: 13 July 2026.
• GSTR-3B due: 22 July 2026 (for most states).

States like Mizoram, Nagaland, and Tripura have a later due date of 24th for GSTR-3B.

GST Composition Scheme: Annual Return Deadlines

Businesses registered under the composition scheme pay tax at a fixed rate (e.g., 1% for manufacturers, 5% for restaurants) and file fewer returns. However, their compliance requirements are annual.

For example, for Q1 (April-June 2026), CMP-08 is due 18 July 2026. The annual GSTR-4 for 2026-27 is due 30 April 2027.

E-Way Bill Due Dates and Validity Rules

An e-way bill is a digital document required for transporting goods worth over ₹50,000. It must be generated before the movement starts and is valid for a specific period based on distance:

E-way bills must be generated before the goods are moved. For example, if you transport goods on 15 May 2026, the e-way bill must be generated by 14 May 2026 (or earlier if the validity period is short).

Common E-Way Bill Mistakes to Avoid

• Incorrect vehicle number: Update the vehicle details on the e-way bill portal if the transporter changes the vehicle mid-journey.
• Expired validity: If your goods are delayed, you can extend the validity by updating the e-way bill before it expires.
• Missing details: Ensure the recipient’s GSTIN, invoice number, and HSN code are accurate to avoid rejection.
• No e-way bill for exempted goods: Some goods (like fruits, vegetables, or milk) are exempt from e-way bills. Check the e-way bill portal for the latest list.

Input Tax Credit (ITC) Reconciliation: A Monthly Must-Do

One of the biggest reasons for GST notices is mismatched ITC. The GST system cross-references your GSTR-3B with your suppliers’ GSTR-1 to ensure the credits you claim are valid. If there’s a mismatch, you’ll receive a notice asking for an explanation.

How to Reconcile ITC Monthly

1. Download GSTR-2B: This auto-generated statement lists all ITC available to you based on your suppliers’ GSTR-1 filings. It’s available on the 12th of every month.
2. Compare with your records: Check if the ITC in GSTR-2B matches your purchase invoices. Flag discrepancies (e.g., missing invoices, incorrect GSTINs).
3. Follow up with suppliers: If a supplier hasn’t filed GSTR-1, request them to do so immediately. You can’t claim ITC for invoices not reported by your supplier.
4. Reverse excess ITC: If you’ve claimed ITC incorrectly, reverse it in your next GSTR-3B using Form DRC-03.

For example, if your supplier files GSTR-1 late in May 2026, the ITC for that invoice won’t appear in your May GSTR-2B. You can claim it in June GSTR-2B instead.

Penalties for Late GST Filing in 2026-27

Late filing of GST returns attracts two types of penalties: late fees and interest. Here’s what you need to know:

No interest if tax is paid on time

For example, if you file GSTR-3B for April 2026 on 25 May 2026 (5 days late), the late fee is ₹50 × 5 = ₹250. If you owe ₹10,000 in tax, you’ll also pay interest of ₹10,000 × 18% × (5/365) ≈ ₹24.66.

When Does GST Registration Get Suspended?

If you don’t file returns for two consecutive tax periods (or six months), your GST registration may be suspended. The GST department can block your GSTIN, preventing you from:

• Issuing tax invoices.
• Claiming ITC.
• Making interstate sales.

To reactivate your registration, you’ll need to file all pending returns and pay any penalties or interest.

Automating GST Compliance: Tools and Tips

Managing GST deadlines manually is error-prone, especially if you have multiple branches or high transaction volumes. Here are the best tools and strategies to stay compliant:

Top GST Compliance Software for Small Businesses

• Zoho Books: Automates GSTR-1 and GSTR-3B filing, syncs with the GST portal, and generates e-way bills. Pricing starts at ₹8,999/year.
• Tally.ERP 9: A widely used accounting software with built-in GST compliance. The latest version supports QRMP scheme and e-invoicing. Pricing starts at ₹18,000 (one-time).
• ClearTax: Offers GST filing, e-way bill generation, and ITC reconciliation. Plans start at ₹999/month.
• Sage 50cloud: Suitable for small businesses with inventory management needs. Pricing starts at ₹12,000/year.

Free Tools and Resources

• GST Portal: The official GST portal offers free return filing, e-way bill generation, and ITC matching tools.
• GST Suvidha Providers (GSPs): Authorized third-party apps like eWay Bill Portal and GST Suvidha Kendra help with return filing and compliance.
• Excel Templates: The GST portal provides downloadable Excel templates for GSTR-1, GSTR-3B, and GSTR-4. These are useful for businesses with simple transactions.

What to Do If You Miss a GST Deadline

Mistakes happen. If you miss a GST deadline, here’s your step-by-step recovery plan:

Step 1: File the Return ASAP

Even if you can’t pay the tax immediately, file the return to avoid further late fees. The late fee for GSTR-3B is capped at ₹5,000, but interest continues to accrue until the tax is paid.

Step 2: Pay Late Fees and Interest

Late fees can be paid via the GST portal under “Payment” > “Create Challan.” Interest is calculated as 18% per annum on the unpaid tax. For example, if you owe ₹50,000 and file 10 days late, interest is ₹50,000 × 18% × (10/365) ≈ ₹246.58.

Step 3: Apply for Condonation of Delay (If Applicable)

If you have a genuine reason for missing the deadline (e.g., natural calamity, technical glitches), you can apply for condonation of delay via Form DRC-01. The GST department may waive late fees but not interest. Submit the form on the GST portal with supporting documents.

Step 4: Rectify Errors in Subsequent Returns

If you underreported sales or overclaimed ITC, correct it in your next return. Use Form DRC-03 to pay any additional tax or reverse excess ITC.

GST Return Filing for E-Commerce Sellers

E-commerce operators (like Amazon, Flipkart, or Meesho sellers) have additional compliance requirements. Here’s what you need to know:

Key Returns for E-Commerce Sellers

• GSTR-8: Filed monthly by e-commerce operators collecting TCS (1% on sales). Due 10th of the next month.
• GSTR-1: Filed monthly or quarterly (depending on turnover) to report outward supplies.
• GSTR-3B: Filed monthly or quarterly to declare tax liability and ITC.

For example, if you sell on Amazon and your turnover is ₹8 crore, you must file:

• GSTR-8: 10th of every month (e.g., 10 June 2026 for May sales).
• GSTR-1: 11 June 2026 (monthly).
• GSTR-3B: 20 June 2026.

TCS Compliance for E-Commerce

E-commerce operators must deduct 1% TCS on the gross value of sales (excluding GST) and deposit it to the government by the 10th of the next month. For example, if you sell goods worth ₹1,00,000 on Amazon in May 2026, Amazon will deduct ₹1,000 as TCS and deposit it by 10 June 2026.

You can claim this TCS as a credit in your GSTR-3B. Ensure the TCS amount appears in your GSTR-2B to avoid mismatches.

GST and E-Invoicing: What’s Changing in 2026-27

E-invoicing is now mandatory for businesses with a turnover exceeding ₹5 crore. From 1 October 2026, the threshold will be reduced to ₹2 crore. Here’s what you need to know:

E-Invoicing Deadlines and Requirements

• Applicability: Businesses with turnover > ₹2 crore must generate e-invoices for B2B sales.
• Due Date: E-invoices must be generated before or at the time of supply (i.e., before issuing the invoice).
• IRN Generation: Each e-invoice must have a unique Invoice Reference Number (IRN) generated via the e-invoice portal.
• IRP Validation: The Invoice Registration Portal (IRP) validates the e-invoice and issues a QR code and IRN.

For example, if you issue an invoice on 15 May 2026, the e-invoice must be generated and validated by the IRP before 15 May 2026. The IRN and QR code must be printed on the invoice.

Penalties for Non-Compliance

• ₹10,000 per invoice: If you fail to generate an e-invoice, the GST department can impose a penalty.
• GSTIN suspension: Repeated non-compliance can lead to suspension of your GST registration.
• ITC rejection: Suppliers who don’t generate e-invoices may find their buyers unable to claim ITC for those invoices.

State-Wise GST Return Due Dates: Does Your State Have a Different Deadline?

Most states follow the standard GST due dates, but some have slight variations for GSTR-3B. Here’s a state-wise breakdown for 2026-27:

For example, if you’re in Mizoram and file GSTR-3B for April 2026, the due date is 24 May 2026 (instead of 20 May). Always check the GST portal for updates, as due dates can change.

Common GST Filing Mistakes and How to Avoid Them

Even experienced businesses make mistakes with GST filings. Here are the most common errors and how to fix them:

1. Mismatched Invoice Numbers

Problem: If your invoice numbers don’t match between your books and GSTR-1, the GST portal will flag it as a mismatch.

Solution: Use a consistent numbering format (e.g., INV-2026-001) and update your accounting software accordingly.

2. Incorrect HSN Codes

Problem: Using the wrong HSN code (e.g., 4 digits instead of 6) can lead to ITC rejection.

Solution: Refer to the official HSN code list and update your product master in your accounting software.

3. Not Reporting Nil-Rated or Exempt Supplies

Problem: Forgetting to report nil-rated (0% GST) or exempt supplies in GSTR-1 can trigger a mismatch notice.

Solution: Include a separate table for nil-rated/exempt supplies in GSTR-1, even if the amount is zero.

4. Claiming ITC for Non-GST Invoices

Problem: Claiming ITC for invoices without GST or from unregistered suppliers can lead to penalties.

Solution: Only claim ITC for invoices with a valid GSTIN and GST amount. For purchases from unregistered suppliers, pay tax under reverse charge mechanism.

5. Late Payment of Tax

Problem: Paying tax after the due date incurs interest charges of 18% per annum.

Solution: Set up automatic payments via NEFT/RTGS or use the GST portal’s challan system to pay tax on time.

“The key to GST compliance is consistency. Reconcile your books monthly, automate wherever possible, and never ignore a GST notice. Proactive compliance saves you time, money, and stress.” — Rajesh Kumar, GST Practitioner, Delhi

Frequently Asked Questions