September 2026 is a critical month for Indian taxpayers, businesses, and various entities, with several important income tax compliance deadlines fast approaching. Missing these dates for tax payments, statements, or audit reports can lead to penalties or increased scrutiny from the Income Tax Department. Staying informed and preparing in advance is essential for smooth compliance.
Key Income Tax Deadlines in September 2026
September 7: TDS and TCS Payment Deadline
- Taxpayers must deposit Tax Deducted at Source (TDS) or Tax Collected at Source (TCS) for August 2026 with the Central Government.
- Government authorities collecting TDS/TCS should remit these amounts to the Central Government on the same day without an Income Tax challan.
- This date is also the deadline for uploading declarations received in Form No. 127 from buyers during August, as per Income Tax Rules, 2026.
September 14: TDS Certificate Issuance
- Taxpayers are required to issue Form No. 132, which relates to tax deducted at source during July 2026.
- Ensuring that relevant TDS documentation is issued within this timeline is crucial to prevent compliance issues.
September 15: Second Advance Tax Instalment & Other Filings
- This is a significant deadline for all taxpayers liable to pay advance tax. It marks the due date for the second instalment of advance tax for Tax Year 2026-27.
- Stock exchanges must submit Form 1 for August 2026 under the Income Tax Rules, 2026, for transactions where client codes were modified after registration.
- Government offices are also required to submit Form No. 137 by this date if TDS/TCS for August 2026 was paid without a challan.
September 30: Audit and Comprehensive Compliance Deadlines
- Taxpayers must submit the challan-cum-statement in Form No. 141 for tax deducted under Section 393 during August 2026.
- This date is particularly relevant for taxpayers mandated to furnish an audit report under Section 44AB for Assessment Year 2026-27. This applies to corporate or non-corporate assessees whose income tax return is due by October 31, 2026.
- Trusts, funds, hospitals, universities, and other educational or medical institutions covered by specific requirements must submit their audit reports using Form 10B or Form 10BB.
Keeping a diligent track of these September deadlines will help taxpayers ensure timely completion of their tax payments, statements, and documentation, thereby avoiding unnecessary penalties and compliance complications with the Income Tax Department.