Running a business in India means keeping track of multiple tax and regulatory deadlines every month. Missing these can result in penalties and interest, which is why staying updated with the compliance calendar is important.
Here is a simplified list of all the important due dates in September 2025.
Key Compliance Dates – September 2025
7 September – TDS / TCS Payment (August 2025)
Businesses must deposit Tax Deducted at Source (TDS) and Tax Collected at Source (TCS) for August.
10 September – Professional Tax on Salaries (August 2025)
Professional Tax (PT) is state-specific. The due date may differ based on the state in which your business operates.
11 September – GSTR-1 (Monthly) for August 2025
All monthly GST filers need to file their GSTR-1 return for outward supplies.
13 September – GSTR-1 IFF (Optional) for QRMP Scheme (August 2025)
Quarterly filers under the QRMP scheme can upload invoices using the Invoice Furnishing Facility (IFF).
15 September
- Advance Tax Payment (July–September 2025 Quarter) – Second installment for FY 2025-26.
- PF & ESI Returns and Payment (August 2025) – Employers must deposit Provident Fund and ESI contributions.
- Income Tax Return (ITR) for Non-Audit Cases (FY 2024-25) – Due date for individuals and non-corporates who are not subject to tax audit.
20 September – GSTR-3B (Monthly) for August 2025
Monthly GST payment and return filing.
25 September – GST Challan Payment (Quarterly Filers)
For businesses under the QRMP scheme, GST challan must be paid if available ITC is not sufficient.
27 September – AOC-4 Filing for One Person Companies (FY 2024-25)
OPCs need to file their annual financial statements in Form AOC-4.
30 September
- Audit Report (Form 3CB-3CD/3CA-3CD) (FY 2024-25) – Due date for filing tax audit reports for corporates and non-corporates.
- Annual General Meeting (AGM) for Companies – Last date for holding the AGM.
- DIR-3 KYC (Directors/LLPs) – Mandatory KYC filing for all directors and designated partners.
- TDS Payment in Forms 26QB/26QC/26QD/26QE (August 2025) – TDS on property, rent, contractor payments, and crypto assets.
📌 Why Tracking Compliance Dates Matters
- Avoids penalties and late fees.
- Ensures smooth financial and regulatory operations.
- Builds credibility with tax authorities and stakeholders.
✅ Pro Tip: Always prepare documents at least a week before the due date. This avoids last-minute technical glitches and ensures timely filing.
Final Thoughts
September 2025 brings multiple tax, GST, and corporate compliance deadlines. Businesses should mark these dates in advance and prepare the necessary returns and payments. If you find compliance tracking difficult, working with a professional tax consultant or Virtual CFO can save both time and money.
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This article is only a knowledge-sharing initiative and is based on the Relevant Provisions as applicable and as per the information existing at the time of the preparation. In no event, RMPS & Co. or the Author or any other persons be liable for any direct and indirect result from this Article or any inadvertent omission of the provisions, update, etc if any.
Published on: September 1, 2025