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GST Compliance Calendar for October 2025: Key Due Dates

As October rolls in, so do the GST deadlines that keep businesses on their toes. Whether you?re a small business owner, a tax professional, or managing a larger enterprise, staying ahead of these dates is key to avoiding penalties and keeping your compliance game strong. At Taxilla, we?re all about simplifying GST for you. This calendar breaks down the essential due dates for October 2025 in a straightforward way so you can plan ahead and focus on growing your business.

Why October 2025 Is a Big Month for GST

October marks the end of the July?September quarter, which means a mix of monthly and quarterly filings for businesses under the GST regime. If your annual turnover exceeds ?5 crore, you?re likely filing monthly returns such as GSTR-3B and GSTR-1. Smaller businesses under the Quarterly Return Monthly Payment (QRMP) scheme or Composition Scheme have their own set of deadlines. Missing these can lead to penalties and interest (commonly ?200 per day subject to applicable caps, plus interest on late payments at 18% per annum). This guide helps you lock in the dates and avoid penalties.

October 2025 GST Due Dates: Your Month at a Glance

Key GST due dates ? October 2025
Date Form / Return Who Needs to File? Details
October 10 GSTR-7 & GSTR-8 TDS deductors & TCS collectors For September 2025 transactions. GSTR-7 is for those deducting TDS under GST; GSTR-8 is for e-commerce operators collecting TCS.
October 11 GSTR-1 (Monthly) Businesses with turnover > ?5 crore Summary of outward supplies for September 2025. File early to avoid portal congestion.
October 13 GSTR-1 (Quarterly) QRMP scheme taxpayers Outward supplies for July?September 2025.
October 13 GSTR-5 & GSTR-6 Non-residents & Input Service Distributors GSTR-5 for non-resident taxpayers; GSTR-6 for ISDs distributing input tax credit (for September 2025).
October 18 CMP-08 Composition Scheme taxpayers Quarterly tax payment for July?September 2025.
October 20 GSTR-3B (Monthly) & GSTR-5A Businesses with turnover > ?5 crore & OIDAR providers GSTR-3B summarizes tax liability for September; GSTR-5A for OIDAR supplies.
October 22 GSTR-3B (Quarterly) QRMP filers in Category X states Tax summary for July?September for Category X states (see state list below).
October 24 GSTR-3B (Quarterly) QRMP filers in Category Y states Tax summary for July?September for Category Y states (see state list below).
October 25 ITC-04 Businesses with turnover > ?5 crore Half-yearly statement of goods sent/received for job work (April?September 2025).
October 28 GSTR-11 UIN holders For refund claims on inward supplies for September 2025.
October 31 QRMP Opt-in / Opt-out Small taxpayers (turnover ? ?5 crore) Last day to choose or exit the QRMP scheme for the October?December quarter. (Decision on the GST portal; no return filing required on this date.)

Note on State Categories

Category X states: Chhattisgarh, Madhya Pradesh, Gujarat, Maharashtra, Karnataka, Goa, Kerala, Tamil Nadu, Telangana, Andhra Pradesh, and Union Territories such as Daman & Diu, Dadra & Nagar Haveli, Puducherry.
Category Y states: Himachal Pradesh, Punjab, Haryana, Rajasthan, Uttar Pradesh, Bihar, West Bengal, Jharkhand, Odisha, and Union Territories such as Chandigarh, Delhi, Jammu & Kashmir, Ladakh.

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Tips to Nail Your GST Compliance This October

  • Start early. Gather invoices, purchase records, and bank statements at least a week before each deadline. Use an Excel tracker or GST software to streamline data collection.
  • Double-check ITC claims. Reconcile GSTR-3B ITC with supplier details in GSTR-2B to reduce mismatch notices.
  • Stay updated. The GST Council may extend deadlines or issue notifications?verify on the GST portal or trusted advisory channels.
  • Use the right tools. Automation platforms (including Taxilla?s GST solutions) reduce manual errors, speed up reconciliations, and simplify filings. Learn more at Taxilla ? India GST.
  • Plan for cash flow. QRMP taxpayers should ensure sufficient liquidity for the quarterly tax payment.
  • If you miss a deadline, act fast. File as soon as possible to minimize penalties; explore condonation options only when necessary. 

Common Pitfalls to Avoid

  • Mixing up dates: Monthly and quarterly filers have different deadlines; Category X/Y state distinctions also matter for QRMP filers.
  • Ignoring small returns: Forms such as GSTR-7, GSTR-8, or ITC-04 may appear minor but can trigger notices if skipped.
  • Tech glitches: The GST portal can slow near deadlines?file a day or two early when possible.

Why Compliance Matters

Timely GST compliance helps avoid penalties and interest, preserves your business reputation, enables seamless ITC claims, and reduces the risk of authority scrutiny. Organized filings also build trust with vendors and clients who depend on your GSTIN for their own compliance.

How Taxilla Can Help

Taxilla provides tools to simplify filings, reconcile data automatically, and manage complex tasks such as ITC-04 for job work. Whether you?re a solo entrepreneur or a large enterprise, our India GST services are built to save time and reduce risk. Contact Taxilla for a consultation or to explore automation options.

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What?s your biggest GST challenge this October? Are you juggling multiple deadlines or worried about ITC mismatches? Contact us at Taxilla we?re here to help.

Last updated: September 30, 2025. Always verify deadlines with the official GST portal as dates may change due to official notifications.

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