GSTR-1 and GSTR-3B Due Dates 2026-27: Calendar, Late Fees & QRMP Guide
Full GSTR-1 & GSTR-3B calendar for 2026-27: monthly due dates, QRMP quarterly dates, late fees, interest, and 1-click GSTR report from BikriBook.
Platform Owner · · 4 min read
Missing GSTR-1 or GSTR-3B by even one day means late fee + 18% interest on your GST. In 2026-27, the calendar is non-negotiable.
This page gives you the full due-date calendar for monthly & QRMP filers, the exact late fee math, and how to get your GSTR-1 / 3B data ready in BikriBook in one click — instead of tallying registers at 11 PM on the 20th.
01 GSTR-1 vs GSTR-3B — 30 Sec Refresher
Return | What you report | Who files | Due date 2026-27 |
GSTR-1 | Outward supplies (your sales) — B2B, B2C, exports, CDNR, HSN summary | All regular taxpayers | 11th of next month (monthly) / 13th after quarter (QRMP) |
GSTR-3B | Summary + tax payable — outward tax, ITC, net payable, payment | All regular taxpayers | 20th of next month (monthly) / 22nd/24th after quarter (QRMP) |
GSTR-1 IFF | QRMP optional upload of B2B invoices for month 1 & 2 of quarter | QRMP filers only | 13th of next month (optional) |
If you file monthly, you file 24 returns a year (12 × GSTR-1 + 12 × GSTR-3B). QRMP cuts that to 8 if turnover ≤ ₹5 Cr — see below.
02 Full Calendar 2026-27 — Monthly Filers
Month (2026-27) | GSTR-1 Due | GSTR-3B Due | Day of Week* |
April 2026 | 11 May 2026 | 20 May 2026 | Mon / Wed |
May 2026 | 11 Jun 2026 | 20 Jun 2026 | Thu / Sat |
June 2026 | 11 Jul 2026 | 20 Jul 2026 | Sat / Mon |
July 2026 | 11 Aug 2026 | 20 Aug 2026 | Tue / Thu |
August 2026 | 11 Sep 2026 | 20 Sep 2026 | Fri / Sun |
September 2026 | 11 Oct 2026 | 20 Oct 2026 | Sun / Tue |
October 2026 | 11 Nov 2026 | 20 Nov 2026 | Wed / Fri |
November 2026 | 11 Dec 2026 | 20 Dec 2026 | Fri / Sun |
December 2026 | 11 Jan 2027 | 20 Jan 2027 | Mon / Wed |
January 2027 | 11 Feb 2027 | 20 Feb 2027 | Thu / Sat |
February 2027 | 11 Mar 2027 | 20 Mar 2027 | Thu / Fri |
March 2027 | 11 Apr 2027 | 20 Apr 2027 | Sun / Tue |
*Day varies by year — date is what matters. If due date falls on a holiday, CBIC sometimes extends — check CBIC notification.
03 QRMP — Quarterly Calendar (Turnover ≤ ₹5 Cr)
QRMP = Quarterly Return Monthly Payment. You file GSTR-1 & GSTR-3B once per quarter, but pay tax monthly via challan PMT-06 (by 25th).
Quarter (FY 26-27) | GSTR-1 (QRMP) Due | GSTR-3B Due (by state group) | PMT-06 Payment (M1, M2) |
Apr-Jun 2026 (Q1) | 13 Jul 2026 | 22 Jul — Category A states (incl. UP, Delhi) / 24 Jul — Category B | 25 May, 25 Jun |
Jul-Sep 2026 (Q2) | 13 Oct 2026 | 22 Oct / 24 Oct | 25 Aug, 25 Sep |
Oct-Dec 2026 (Q3) | 13 Jan 2027 | 22 Jan / 24 Jan | 25 Nov, 25 Dec |
Jan-Mar 2027 (Q4) | 13 Apr 2027 | 22 Apr / 24 Apr | 25 Feb, 25 Mar (Q4: 25 Mar final) |
IFF (Invoice Furnishing Facility) — optional upload of B2B invoices for month 1 & 2 of quarter by 13th — helps your customer get ITC early even though you file quarterly.
📅 Download: Want this as PDF? In BikriBook → Reports → GST Calendar → Download 2026-27 PDF & add to Google Calendar (1 click). Also check GST Return Status via bikribook.com/tools/gst-return-status.
04 Late Fee & Interest — Exact Math (2026)
Return | Normal Late Fee | Nil Return Late Fee | Max per Return (CBIC cap) | Interest |
GSTR-1 | ₹50/day (₹25 CGST + ₹25 SGST) | ₹20/day (₹10+₹10) | ₹10,000 (₹5k CGST+₹5k SGST) — reduced caps for turnover slabs sometimes | No interest (no payment in GSTR-1) |
GSTR-3B | ₹50/day | ₹20/day | ₹10,000 — lower caps (e.g., ₹2,000) notified for small turnover, check latest CBIC circular | 18% per year on net tax payable (cash portion) |
PMT-06 (QRMP payment) | Interest only if short-paid | — | — | 18% on short amount |
Example: GSTR-3B for Aug 2026 due 20 Sep. Filed 25 Sep (5 days late) with Tax payable ₹18,000: Late fee = 5 × ₹50 = ₹250 + Interest = 18,000 × 18% × 5/365 = ~₹44. Total ≈ ₹294.
Use BikriBook GST Late Fee Calculator → enter return, due date, filing date, tax → get exact fee + interest. Link: bikribook.com/tools/gst-late-fee-calculator
05 How to File on Time Without Manual Work
Step 1: Bill daily in BikriBook — Invoices auto-categorised B2B/B2C/CDNR + HSN summary. No month-end scrambling.
Step 2: On 5th of next month — Reports → GSTR-1 → Preview → Download JSON → Upload at gst.gov.in → Submit. Same for GSTR-3B → summary table ready.
Step 3: QRMP monthly — Reports → PMT-06 challan amount auto from invoices → Pay via GST portal by 25th.
Step 4: Set reminder — BikriBook dashboard shows ‘GSTR-1 due in 3 days’ badge. Add to phone calendar.
CA tip: Pro: On 10th & 19th, export GSTR-1 & 3B preview even if not filing — share Excel with CA early. CAs hate last-day dumps.
06 What Happens If You Miss the Due Date?
You can still file with late fee + interest. But: you cannot file GSTR-1 of the current month if previous GSTR-1/3B is pending; your buyer’s GSTR-2B (ITC) gets delayed; e-way bill generation gets blocked if you miss GSTR-3B for 2 consecutive months (Rule 59(6)).
Never miss again — BikriBook auto-prepares GSTR-1 JSON + GSTR-3B summary from your bills. bikribook.com/register • Try free 14 days → Also try: GST Late Fee Calculator & GST Return Status tools
Related: What is Pakka Bill? • e-Invoicing IRN Guide • HSN Code List
Frequently asked questions
- What is the due date for GSTR-1 and GSTR-3B?
- GSTR-1: 11th of next month (monthly filers). GSTR-3B: 20th (or 22nd/24th for QRMP under staggered dates). For QRMP quarterly filers, GSTR-1/IFF is due 13th after quarter, GSTR-3B 22nd/24th.
- What is QRMP scheme due date?
- Quarterly Return Monthly Payment: File GSTR-1/GSTR-3B quarterly if turnover ≤ ₹5 Cr. Due 13th (GSTR-1/IFF) and 22nd/24th (3B) of month after quarter-end. Pay tax monthly via PMT-06 by 25th.
- What is late fee for GSTR-1 and GSTR-3B?
- ₹50/day (₹20 for Nil) max ₹10,000 per return. Separate for each. Year-wise caps notified by CBIC. Use BikriBook GST Late Fee Calculator to compute.
- Can I file GSTR-3B after due date?
- Yes, with late fee + 18% interest on net tax (cash ledger). Cannot file GSTR-1 of current month if previous GSTR-1/3B pending.
- How does BikriBook help with due dates?
- BikriBook auto-generates GSTR-1 JSON (B2B, B2C, CDNR, HSN summary) and GSTR-3B summary from your invoices. Export & upload to portal — no manual entry.
