GST Due Date for April 2026: GSTR-3B, GSTR-1 and QRMP
Every GST deadline falling in April 2026 — what is due, who has to file, and what happens if you miss. Updated 11 April 2026.
Next upcoming deadline: GSTR-3B for March 2026 — due 20 April 2026
This is the last GSTR-3B of FY 2025-26 for monthly filers. File early to avoid portal congestion and ensure your ITC claim window stays open.
All GST deadlines in April 2026
April is one of the busiest GST months because it closes out the previous financial year (FY 2025-26) and opens the new one. Here is every return that is due during April 2026:
| Date | Return | Who files | Status |
|---|---|---|---|
| 11 Apr 2026 | GSTR-1 (March 2026) | Monthly filers (turnover > ₹5 Cr) | Past |
| 13 Apr 2026 | GSTR-1 / IFF (Q4 FY25-26) | QRMP quarterly filers | Past |
| 18 Apr 2026 | CMP-08 (Q4 FY25-26) | Composition scheme dealers | Past |
| 20 Apr 2026 | GSTR-3B (March 2026) | Monthly filers (all categories) | Upcoming |
| 22 Apr 2026 | GSTR-3B (Q4 FY25-26) | QRMP — Category X states | Upcoming |
| 24 Apr 2026 | GSTR-3B (Q4 FY25-26) | QRMP — Category Y states | Upcoming |
| 25 Apr 2026 | PMT-06 (March 2026) | QRMP monthly tax payment | Upcoming |
GSTR-3B due date for March 2026: 20 April 2026
If you are a monthly GSTR-3B filer, your return for the tax period March 2026 must be filed by 20 April 2026. This applies regardless of turnover — there is no state-wise staggering for monthly filers, only for QRMP quarterly returns.
March GSTR-3B is especially important because it is the final return of FY 2025-26. Any ITC you forgot to claim in earlier months can still be claimed here, subject to the cut-off under Section 16(4) — for FY 2025-26, the outer limit to claim ITC is 30 November 2026 or the date of filing your annual return, whichever is earlier. See our detailed Input Tax Credit guide for the rules.
GSTR-1 for March 2026: was due 11 April 2026
Monthly GSTR-1 filers were required to file their March 2026 return by 11 April 2026. If you missed it, file immediately — every day of delay adds a late fee of ₹50 (₹25 CGST + ₹25 SGST), or ₹20/day for nil returns. The more important cost is that your customers cannot claim ITC on your March invoices until your GSTR-1 is filed, which blocks their GSTR-2B.
QRMP Q4 FY 2025-26: GSTR-1 was due 13 April 2026
Quarterly GSTR-1 (or IFF) for Q4 FY 2025-26 (January–March 2026) was due on 13 April 2026 for QRMP scheme filers with turnover up to ₹5 crore. GSTR-3B for the same quarter is due on 22 or 24 April depending on your state category.
- Category X (22 April 2026): Chhattisgarh, Madhya Pradesh, Gujarat, Maharashtra, Karnataka, Goa, Kerala, Tamil Nadu, Telangana, Andhra Pradesh, Daman & Diu, Dadra & Nagar Haveli, Puducherry, Andaman & Nicobar, Lakshadweep.
- Category Y (24 April 2026): Himachal Pradesh, Punjab, Uttarakhand, Haryana, Rajasthan, Uttar Pradesh, Bihar, Sikkim, Arunachal Pradesh, Nagaland, Manipur, Mizoram, Tripura, Meghalaya, Assam, West Bengal, Jharkhand, Odisha, Jammu & Kashmir, Ladakh, Chandigarh, Delhi.
CMP-08 for composition dealers: was due 18 April 2026
Composition scheme taxpayers had to file CMP-08 (quarterly statement of self-assessed tax) for Q4 FY 2025-26 by 18 April 2026. The annual GSTR-4 for composition dealers is due by 30 June 2026.
What if you miss the 20 April GSTR-3B deadline?
Missing GSTR-3B triggers three costs simultaneously:
- Late fee: ₹50 per day (₹25 CGST + ₹25 SGST), or ₹20/day for nil returns, capped based on turnover.
- Interest: 18% per annum on the net tax liability, calculated from 21 April until the date of actual payment.
- ITC block: You cannot file the next month's GSTR-3B until the previous month is filed. Consecutive defaults can block e-way bill generation and eventually cancel your registration.
Full breakdown in our GST late fees and penalties guide.
What to do right now (April 2026 checklist)
- Reconcile March 2026 purchases against your GSTR-2B before filing GSTR-3B — this is your last chance to catch missed ITC for FY 2025-26 cleanly.
- File GSTR-3B by 18 April, not 20 April. A 2-day buffer protects you from portal downtime on the deadline day.
- Pay tax before filing. The return cannot be submitted until your electronic cash/credit ledger has sufficient balance.
- Check year-end reversals: Section 17(5) blocked credits, personal-use apportionment, and ineligible ITC should all be reversed in March GSTR-3B.
- Set up reminders for May: April 2026 GSTR-1 is due 11 May, and April GSTR-3B is due 20 May.
Tip: March GSTR-3B is also the return where most freelancers discover forgotten receipts. Sahaj keeps every scanned invoice tagged and ready, so your year-end ITC claim is complete, not guesswork.
Looking ahead: May 2026 GST deadlines
For FY 2026-27 planning, here are the key May 2026 deadlines:
- 11 May 2026: GSTR-1 for April 2026 (monthly filers)
- 20 May 2026: GSTR-3B for April 2026 (monthly filers)
- 25 May 2026: PMT-06 for April 2026 (QRMP monthly tax payment)
The full year calendar is in our GST filing deadlines 2026 guide.
Key takeaways
- The only major deadline still upcoming in April 2026 is GSTR-3B for March 2026, due 20 April.
- March GSTR-3B closes out FY 2025-26 — use it to clean up any missed ITC for the year.
- QRMP GSTR-3B for Q4 is due 22 or 24 April based on your state category.
- Late filing costs ₹50/day + 18% interest, plus it blocks your May returns until cleared.
- Track receipts year-round with Sahaj so March GSTR-3B is just a review, not a scramble.
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