What is the GSTR-3B due date in October 2026?

For monthly filers, GSTR-3B for Sep 2026 is due on 20 October 2026. QRMP taxpayers file quarterly, by the 22nd or 24th of the month after the quarter depending on their state.

What is the GSTR-1 due date in October 2026?

For monthly filers, GSTR-1 for Sep 2026 is due on 11 October 2026.

When is TDS to be deposited in October 2026?

TDS deducted in Sep 2026 is to be deposited by 7 October 2026.

Do these dates include extensions?

No. They are the default statutory dates. When the government extends a date, the notification overrides what is shown here.

COMPLIANCE CALENDAR

GST, TDS, income tax and ROC due dates: October 2026

The main statutory due dates in October 2026 are: 7 October: Challan 281N; 11 October: GSTR-1; 20 October: GSTR-3B; 31 October: ITR / 3CEB, 138 / 140 / 144, Form 143. These are the default dates; an extension notified by CBDT, CBIC or MCA overrides them, and a date that falls on a Sunday or public holiday moves to the next working day.

Wed

Challan 281N · Deposit TDS / TCS · Sep 2026

Sat

GSTR-7 / GSTR-8 · GSTR-7 (GST TDS) / GSTR-8 (e-commerce TCS) · Sep 2026

Sun *

GSTR-1 · GSTR-1 (monthly) · Sep 2026

Tue

GSTR-6 · GSTR-6 (input service distributor) · Sep 2026
GSTR-1 · GSTR-1 (quarterly, QRMP) · Q2 FY 2026-27

Thu

ECR / ESI challan · PF and ESI payment with ECR · Sep 2026
ADT-1 · Auditor appointment (15 days from AGM) · FY 2025-26Assumes AGM on 30 September.

Sun *

CMP-08 · CMP-08 composition tax payment · Q2 FY 2026-27

Tue

GSTR-3B · GSTR-3B (monthly) with tax payment · Sep 2026Table 3.1 is locked to GSTR-1 from the July 2025 period: correct GSTR-1 through GSTR-1A before filing.

Thu

GSTR-3B · GSTR-3B (quarterly, QRMP) · Q2 FY 2026-2722nd for Category X states, 24th for Category Y states.

Fri

AOC-4 · Financial statements (30 days from AGM) · FY 2025-26Assumes AGM on 30 September.
LLP Form 8 · LLP statement of account and solvency · FY 2025-26

Sat

ITR / 3CEB · Income-tax return: audit cases and companies; transfer pricing report · FY 2025-26
MSME-1 · MSME-1 half-yearly return (Apr–Sep) · FY 2026-27
138 / 140 / 144 · TDS quarterly statement · Q2 FY 2026-27Forms 138 (salary), 140 (residents) and 144 (non-residents) replace 24Q, 26Q and 27Q.
Form 143 · TCS quarterly statement · Q2 FY 2026-27Form 143 replaces 27EQ and is now due on the same dates as the TDS statements.

* Falls on a Sunday, so the next working day applies. ROC dates assume the AGM is held on 30 September.

Common questions

What is the GSTR-3B due date in October 2026?: For monthly filers, GSTR-3B for Sep 2026 is due on 20 October 2026. QRMP taxpayers file quarterly, by the 22nd or 24th of the month after the quarter depending on their state.
What is the GSTR-1 due date in October 2026?: For monthly filers, GSTR-1 for Sep 2026 is due on 11 October 2026.
When is TDS to be deposited in October 2026?: TDS deducted in Sep 2026 is to be deposited by 7 October 2026.
Do these dates include extensions?: No. They are the default statutory dates. When the government extends a date, the notification overrides what is shown here.

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