November is one of the most demanding compliance periods of the financial year for tax practitioners and accountants. In addition to filing regular monthly returns for October 2026, businesses must complete all pending reconciliations and adjustments for the prior financial year, FY 2025-26, before 30 November 2026.
Because the festive holiday calendar falls directly around late October and early November, accounting teams need an organized schedule. Planning filings well before the due dates prevents last-minute portal congestion, interest charges, and permanent loss of eligible tax credits.
GST compliance calendar for November 2026
Statutory return deadlines for the October 2026 tax period follow the schedule notified under the CGST Act and CGST Rules:
| Due date | Form | Tax period | Filer type and statutory provision |
|---|---|---|---|
| 11 November 2026 | GSTR-1 | October 2026 | Monthly outward supply filers under Section 37(1) of the CGST Act. |
| 13 November 2026 | IFF (Invoice Furnishing Facility) | October 2026 | Optional facility for QRMP quarterly filers to pass B2B credits under GSTN IFF guidelines. |
| 14 November 2026 | GSTR-2B generation | October 2026 | Auto-generation of static ITC statement under Rule 60(7) of the CGST Rules. |
| 20 November 2026 | GSTR-3B | October 2026 | Monthly return filers under Rule 61(1)(i) of the CGST Rules. See details on GSTR-3B due date for October 2026. |
| 25 November 2026 | Challan PMT-06 | October 2026 | Monthly tax deposit for QRMP filers under Rule 61(3) of the CGST Rules. |
| 30 November 2026 | Statutory cut-off | FY 2025-26 | Final date for prior year ITC, credit notes, and amendments under Section 16(4) and Section 34(2). |
The 30 November 2026 annual cut-off for FY 2025-26
The date of 30 November carries special legal significance under the GST law. Under statutory amendments effective from 1 October 2022, several annual reconciliation timelines tie to 30 November following the end of the financial year, rather than the earlier September return due date:
- Availing missed input tax credit: Under Section 16(4) of the CGST Act, no registered person can avail ITC in respect of any invoice or debit note for supply of goods or services after the thirtieth day of November following the end of the financial year, or furnishing of the annual return under Section 44, whichever is earlier. For FY 2025-26 invoices, this deadline is 30 November 2026.
- Declaring credit notes: Under Section 34(2) of the CGST Act, suppliers who issue credit notes to reduce output tax liability for supplies made during FY 2025-26 must declare them not later than 30 November 2026.
- Rectifying outward supplies in GSTR-1: Under Section 37(3) of the CGST Act and GSTN GSTR-1 guidelines, no rectification of error or omission in respect of invoices of the previous financial year is allowed after 30 November.
- Reversal under Rule 37A: Under Rule 37A of the CGST Rules, where ITC was availed in GSTR-3B but the supplier failed to file their GSTR-3B by 30 September, the recipient must reverse such credit on or before 30 November 2026 to avoid interest under Section 50.
Common mistake: Waiting until the November return filing cycle in December to claim missing FY 2025-26 ITC. Section 16(4) sets 30 November 2026 as the legal ceiling. ITC for FY 2025-26 must be claimed in a return filed on or before 30 November 2026, which means it must be incorporated into the October 2026 GSTR-3B filed by 20 November 2026, or filed via GSTR-3B on or before 30 November 2026.
Worked example: tax impact of missing the 30 November deadline
Consider Mehta Engineering Works, a registered manufacturer with regular monthly filings. During an audit in late October 2026, the accounts team identifies two unprocessed vendor invoices from FY 2025-26 and one unadjusted credit note issued to a customer:
| Document reference | Document date | Taxable value | IGST / Tax amount | Status as of 23 October 2026 |
|---|---|---|---|---|
| Vendor invoice INV-8821 | 14 January 2026 | ₹2,50,000 | ₹45,000 | Appears in GSTR-2B, omitted in books |
| Vendor invoice INV-9104 | 28 February 2026 | ₹1,20,000 | ₹21,600 | Appears in GSTR-2B, omitted in GSTR-3B |
| Customer credit note CN-042 | 10 March 2026 | ₹1,00,000 | ₹18,000 | Sales return, omitted in GSTR-1 |
The total input tax credit at stake is calculated as follows:
Formula: Total eligible ITC = ₹45,000 + ₹21,600 = ₹66,600.
Formula: Output tax reduction from credit note = ₹18,000.
Total cash impact: ₹66,600 + ₹18,000 = ₹84,600.
If Mehta Engineering Works reports these transactions in the October 2026 returns before 30 November 2026, the business saves ₹84,600 in cash outflow. If the team delays filing past 30 November 2026, the ITC of ₹66,600 lapses permanently under Section 16(4), and the tax reduction of ₹18,000 on the credit note cannot be adjusted under Section 34(2).
Step-by-step filing plan for November 2026
To avoid bottlenecks during the festive season, follow this four-stage schedule:
- Stage 1 (Before 5 November 2026): Annual FY 2025-26 reconciliation. Run a full purchase register reconciliation against your FY 2025-26 GSTR-2B statements. Compile all unclaimed invoices, identify supplier filing gaps under Rule 37A, and prepare debit/credit note adjustments.
- Stage 2 (By 11 November 2026): File GSTR-1 for October 2026. Report all regular outward supplies for October 2026. Include any pending credit notes or amendments for FY 2025-26 outward supplies in Table 9B and Table 9A.
- Stage 3 (By 14 November 2026): Verify October GSTR-2B. Download the generated GSTR-2B statement. Verify that current vendor invoices are matched and that no auto-populated ineligible credits are incorrectly claimed in Table 4.
- Stage 4 (By 20 November 2026): File GSTR-3B for October 2026. Claim current October ITC in Table 4(A)(5), add eligible missing FY 2025-26 ITC, reverse any pending Rule 37A supplier defaults, and discharge net cash liabilities.
Penalties for filing after statutory due dates
Filing returns after the prescribed dates attracts both late fees and interest liabilities:
- Late fees under Section 47: Under Notification No. 4/2018-Central Tax and Notification No. 20/2021-Central Tax, late fee for GSTR-1 and GSTR-3B is ₹50 per day (₹25 under CGST and ₹25 under SGST), capped at ₹500 (₹250 CGST and ₹250 SGST) for nil returns.
- Interest under Section 50: Under Section 50(1) of the CGST Act, interest at 18 percent per annum is charged on the net tax liability paid through the electronic cash ledger from the day following the due date until the actual date of payment.
- Audit exposure under Section 74A: For FY 2024-25 onwards, Section 74A of the CGST Act governs demand proceedings for tax not paid, short paid, or ITC wrongly availed, allowing notices within 42 months from the annual return due date.
Frequently asked questions
What is the last date to claim missed FY 2025-26 ITC?
Under Section 16(4) of the CGST Act, the deadline to avail input tax credit for FY 2025-26 invoices is 30 November 2026, or the date of furnishing the annual return in Form GSTR-9, whichever is earlier.
Can credit notes for FY 2025-26 supplies be issued after 30 November 2026?
Under Section 34(2) of the CGST Act, credit notes relating to supplies made during FY 2025-26 cannot be declared in GST returns after 30 November 2026 to reduce tax liability.
What are the regular monthly return due dates in November 2026?
For monthly filers, GSTR-1 for the October 2026 tax period is due on 11 November 2026, while GSTR-3B for October 2026 is due on 20 November 2026.
Reconcile your purchase register before the 30 November cut-off
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Last checked: 23 October 2026. Sources: CBIC Tax Information Portal, GSTN Returns User Manual.