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GSTR-3B Due 20 November — Last Chance for Last Year’s ITC, Plus GST Relief You Missed

Meta description: GSTR-3B for October is due 20 November — the last clean chance to claim last year’s input tax credit. Plus the ₹10,000 GST notice relief, e-way bill changes and the audit ITR deadline.

Checked 13 November: there is no new CBDT or CBIC notification in the last 24 hours, and no extension to any November deadline — despite a Diwali-season appeal asking for one. Today itself is a due date (IFF, GSTR-5 and GSTR-6), and the date that matters most this week is 20 November: GSTR-3B for October, the last clean return in which most monthly filers can still claim input tax credit for FY 2025-26. This update covers that deadline step by step, the GST relief small businesses may have missed, and the changes coming in January and April.

November Deadlines — The Next 18 Days

GSTR-3B on 20 November — Your Last Clean ITC Window

Section 16(4) lets you claim input tax credit on an invoice for a financial year only up to 30 November of the next year, or the date you file the annual return, whichever is earlier. For FY 2025-26, that is 30 November — but the November GSTR-3B falls due in December, which is too late. For most monthly filers, the October GSTR-3B due 20 November is the last practical return for that credit. Work through these steps before you file:

1. File October GSTR-1 first if it is still pending

GSTR-1 was due 11 November and was not extended. A GSTR-3B filed against an unfiled or half-built GSTR-1 is the usual reason your liability and your customers’ ITC disagree. File GSTR-1 now, even late — the late fee is ₹50 a day (₹20 for a nil return).

2. Reconcile ITC with GSTR-2B and clear the IMS

Look for invoices in your books and GSTR-2B that were never claimed, supplier uploads still missing (chase those suppliers before 30 November), and IMS rows left pending or wrongly rejected. Do not rebuild your sales all week while the 20 November return approaches — freeze October sales, credit notes and e-invoices now.

3. Reverse credit where the supplier did not pay

Reverse ITC under Rule 37A where the supplier did not file GSTR-3B by 30 September. And do not claim blocked credits under Section 17(5) just because the deadline is close — a wrong claim now becomes a notice later.

4. Remember: you can no longer edit the liability in GSTR-3B

Since the July 2025 tax period, the tax auto-filled from GSTR-1 cannot be edited in GSTR-3B. Correct it through GSTR-1A before you file 3B. If you had no sales, no purchases with ITC and no tax to pay, you can file a nil GSTR-3B by SMS to 14409 — only when everything is zero.

What Late Filing Costs

Filing GSTR-3B even one day late costs a late fee of ₹50 a day (₹20 a day for a nil return), capped by turnover, plus 18% annual interest on tax paid late in cash under Section 50. Two consecutive missed GSTR-3Bs can also block e-way bill generation — check your block status after filing and use Update Block Status if the portal still shows blocked. A GSTR-3B cannot be filed more than three years after its due date, so the October return closes for good on 20 November 2029.

Two Changes Coming — Prepare Now

E-way bill numbers get longer from 1 January

GSTN Advisory 687 (4 November) extends e-way bill numbers from 12 to 14 digits, and consolidated e-way bill numbers from 10 to 11 digits, from 1 January 2027. Old numbers stay valid, and sandbox testing opens in November — check with your billing software or transporter so January invoices are not held up.

GSTR-3B edits are ending — from April 2027

CBIC has opened a public consultation (1–30 November) on an alternate mechanism for correcting GST liability and ITC. The proposal: from April 2027, liability is fixed only through GSTR-1, GSTR-1A or IFF, and ITC only through the Invoice Management System — no more direct edits in GSTR-3B. The habit to build now is simple: file GSTR-1 right, reconcile IMS every month, and stop treating GSTR-3B as the place to fix mistakes.

No Extension — Despite the Diwali Appeal

NCP leader Supriya Sule appealed to the Finance Minister on 3 November to extend the TDS, TCS and GST deadlines falling around Diwali, citing pressure on chartered accountants, tax practitioners, traders and small businesses. As of 13 November there has been no official announcement of any extension, and tax practitioners tracking the audit ITR note there has been no third date — CBDT moved it once, by Circular 07/2026, and has notified nothing since. Plan on the published dates. Meanwhile, the Confederation of All India Traders (CAIT) meets in New Delhi today, 13 November, pushing GST simplification, fewer notices and litigation, and a ‘One Trader-One Licence’ policy — watch for what comes out of it.

ITR for Audit Cases — 21 November, and Interest Is Already Running

For companies and other assessees whose accounts must be audited, the return for AY 2026-27 is due 21 November. If you did not pay self-assessment tax by 31 October, Section 234A has been charging 1% a month since then, and it runs until the return is furnished, not until the tax is paid. Section 234B charges separately on any shortfall in advance tax. There is no reason to drift towards 30 November — that date is only for transfer pricing cases. Miss 21 November and you fall into the belated-return window, which runs till 31 December.

Most Searched This Week — Quick Answers

Work in this order: file any pending GSTR-1 today, reconcile ITC with GSTR-2B and the IMS, then file GSTR-3B by 20 November and the audit ITR by 21 November. Those three filings cover the dates that cost the most if you miss them — and the ₹10,000 notice relief means the small stuff should stop turning into notices.

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