For any business registered under GST, missing a filing deadline is not just a paperwork problem — it means late fees, interest, blocked input tax credit, and in serious cases, cancellation of your GST registration.
Yet every month, thousands of businesses pay avoidable penalties simply because they weren’t tracking their due dates properly.
This guide gives you a complete, clear picture of every GST return, its deadline, and what happens if you miss it — so you can stay compliant without the stress.
Why GST Filing Compliance Matters More Than Ever
The GST system has become increasingly automated and interconnected. Your GSTR-1 data directly impacts your buyer’s ITC. Your GSTR-3B determines your tax payment. Mismatches between returns trigger automated notices.
The Income Tax Department and GST authorities now share data. Non-compliance in GST can raise red flags in your income tax assessments as well.
Staying on top of GST deadlines is no longer optional — it is a core business discipline.
Types of GST Returns — Who Files What
Before deadlines, understand which returns apply to you.
GSTR-1 Details of all outward supplies (sales). Filed by all regular taxpayers. This data flows directly into your buyers’ GSTR-2B and determines their ITC eligibility.
GSTR-3B Monthly self-declaration of summary sales, ITC claimed, and net tax paid. This is the primary return through which you pay your GST liability.
GSTR-2B Auto-generated ITC statement based on your suppliers’ GSTR-1 filings. You do not file this — it is generated for you. But you must reconcile it before claiming ITC in GSTR-3B.
GSTR-9 Annual return summarising all monthly/quarterly returns for the full financial year. Filed once a year.
GSTR-9C Reconciliation statement and self-certified audit report. Required for taxpayers with aggregate turnover above ₹5 crore.
CMP-08 Quarterly return for Composition Scheme taxpayers. A simple statement of tax payable.
GSTR-4 Annual return for Composition Scheme taxpayers.
GSTR-5 For non-resident taxable persons operating temporarily in India.
GSTR-6 For Input Service Distributors (ISD).
GSTR-7 For persons required to deduct TDS under GST.
GSTR-8 For e-commerce operators required to collect TCS under GST.
GST Filing Deadlines — FY 2026-27
GSTR-1 — Outward Supply Details
| Turnover | Frequency | Due Date |
| Above ₹5 crore | Monthly | 11th of the following month |
| Up to ₹5 crore (QRMP opted) | Quarterly | 13th of month after quarter end |
| QRMP — IFF (optional monthly) | Monthly | 13th of the following month |
So, for April 2026 sales, GSTR-1 is due by 11th May 2026 for monthly filers.
GSTR-3B — Summary Return & Tax Payment
| Turnover | Frequency | Due Date |
| Above ₹5 crore | Monthly | 20th of the following month |
| Up to ₹5 crore — Category A States | Quarterly | 22nd of month after quarter end |
| Up to ₹5 crore — Category B States | Quarterly | 24th of month after quarter end |
Category A States: Chhattisgarh, Madhya Pradesh, Gujarat, Maharashtra, Karnataka, Goa, Kerala, Tamil Nadu, Telangana, Andhra Pradesh, the Union Territories of Daman and Diu, Dadra and Nagar Haveli, Puducherry, Andaman and Nicobar Islands, Lakshadweep.
Category B States: Himachal Pradesh, Punjab, Uttarakhand, Haryana, Rajasthan, Uttar Pradesh, Bihar, Sikkim, Arunachal Pradesh, Nagaland, Manipur, Mizoram, Tripura, Meghalaya, Assam, West Bengal, Jharkhand, Odisha, the Union Territories of Jammu and Kashmir, Ladakh, Chandigarh, Delhi.
QRMP Scheme — Tax Payment for Small Taxpayers
Taxpayers under the QRMP (Quarterly Return Monthly Payment) scheme must pay tax every month using PMT-06 challan even though returns are filed quarterly.
| Month | PMT-06 Due Date |
| First month of quarter | 25th of the following month |
| Second month of quarter | 25th of the following month |
| Third month — tax paid via GSTR-3B | 22nd or 24th (as applicable) |
GSTR-9 — Annual Return FY 2025-26
| Taxpayer | Due Date |
| All regular taxpayers (turnover above ₹2 crore) | 31st December 2026 |
| Taxpayers with turnover up to ₹2 crore | Optional but recommended |
GSTR-9C (Reconciliation Statement) is due on the same date — 31st December 2026 — for taxpayers with aggregate turnover above ₹5 crore.
Composition Scheme Deadlines
| Return | Period | Due Date |
| CMP-08 | April–June 2026 | 18th July 2026 |
| CMP-08 | July–September 2026 | 18th October 2026 |
| CMP-08 | October–December 2026 | 18th January 2027 |
| CMP-08 | January–March 2027 | 18th April 2027 |
| GSTR-4 | Full year | 30th June 2026 |
Other Important GST Returns
| Return | Who Files | Due Date |
| GSTR-5 | Non-resident taxable person | 13th of following month |
| GSTR-6 | Input Service Distributors | 13th of following month |
| GSTR-7 | TDS deductors under GST | 10th of following month |
| GSTR-8 | E-commerce operators (TCS) | 10th of following month |
Penalties for Missing GST Deadlines
This is where non-compliance gets expensive.
Late Fee
GSTR-1 and GSTR-3B:
- ₹50 per day of delay (₹25 CGST + ₹25 SGST)
- ₹20 per day if there is NIL tax liability (₹10 CGST + ₹10 SGST)
- Maximum late fee capped at ₹10,000 per return
GSTR-9 (Annual Return):
- ₹200 per day of delay (₹100 CGST + ₹100 SGST)
- Maximum — 0.25% of turnover in the state
Interest on Late Tax Payment
If you file GSTR-3B late and have unpaid tax:
- 18% per annum on the outstanding tax amount
- Calculated from the due date until the actual date of payment
This adds up very quickly on large tax amounts.
Blocked ITC
If your supplier does not file GSTR-1 on time, the corresponding ITC will not appear in your GSTR-2B — and you cannot claim it. This means your supplier’s non-compliance directly costs your business money.
Cancellation of GST Registration
If returns are not filed for six consecutive months (for monthly filers) or two consecutive quarters (for quarterly filers), the GST officer can initiate cancellation of your registration.
Reinstating a cancelled registration is a time-consuming and difficult process.
ITC Reconciliation — The Step Most Businesses Skip
Before filing GSTR-3B every month, always reconcile your purchase register with GSTR-2B.
If a supplier has not filed their GSTR-1, their invoices will not appear in your GSTR-2B. You can only claim ITC that is reflected there. Claiming ITC beyond what GSTR-2B shows can result in notices, reversal of ITC, and interest.
Make supplier follow-up and ITC reconciliation a fixed part of your monthly GST process — not an afterthought.
Practical GST Compliance Calendar — Monthly Checklist
By the 11th: File GSTR-1 (monthly filers) — upload all sales invoices
By the 13th: File IFF under QRMP if applicable — upload B2B invoices for the month
By the 14th: GSTR-2B is auto-generated — download and reconcile with your purchase register
By the 20th: File GSTR-3B (monthly filers above ₹5 crore) — pay net GST liability
By the 22nd / 24th: File GSTR-3B (QRMP quarterly filers) — at end of each quarter
By the 25th: Pay PMT-06 challan (QRMP scheme — first and second month of each quarter)
Tips to Never Miss a GST Deadline
Set calendar reminders for the 10th, 11th, 13th, and 20th of every month. These are your core GST dates. Treat them like salary day — non-negotiable.
Use accounting software with GST integration. Tools that automatically pull invoice data and generate return-ready reports save enormous time and reduce errors.
Don’t wait for the last day. GST portal traffic is highest on due dates — slowdowns and technical glitches are common. Filing 2 to 3 days early protects you from portal issues.
Reconcile ITC every month, not once a year. Catching a mismatch in month two is far easier than untangling twelve months of discrepancies during the annual return.
Maintain a vendor compliance tracker. Know which of your key suppliers are consistent GSTR-1 filers. Your ITC depends on their compliance, not just yours.
Engage a professional for quarterly reviews. Even if you manage monthly filings in-house, having a CA review your GST position every quarter catches issues before they become costly.
What to Do If You’ve Already Missed a Deadline
Don’t panic — and don’t delay further.
File your overdue return as soon as possible. The late fee is fixed per day, so every day you wait makes it worse. Pay the applicable late fee and interest along with the return.
If you have received a notice for non-filing, respond within the stipulated time. Ignoring a GST notice never makes it go away — it escalates it.
In cases of genuine hardship, you can approach the GST officer for waiver of penalties under the provisions of the Act. Such waivers are discretionary but have been granted in cases with legitimate reasons.
Final Thoughts
GST compliance is not complicated — it is consistent. Businesses that stay on top of their monthly filings, reconcile their ITC regularly, and maintain clean records rarely face penalties or notices.
The ones that struggle are the ones who treat GST as a once-in-a-while task rather than a monthly financial discipline.
Build the habit. Set the reminders. File on time. It costs far less than the alternative.









