Failure to submit documentation, returns, and taxes before the deadlines may result in penalties or scrutiny by the Income Tax Department.
Tax deadlines in September 2026
September 7 : Taxpayers must deposit TDS or TCS collected for the month of August 2026. The TDS/TCS collected by the government authorities shall by paid to the Central Government on the same day without production of an Income Tax challan.
This is also the deadline for uploading declarations received in Form No. 127 from the buyer in the month of August under the Income Tax Rules, 2026
September 14 : Form No. 132 for tax deducted at source in the month of July 2026 must be issued by this date.
September 15 : Taxpayers must pay their second instalment of advance tax for the Tax Year 2026-27. It is also the last date to submit the statement in Form 1 for August 2026 under the Income Tax Rules, 2026. The statement is issued by the stock exchange for transactions in which client codes have been modified after being registered in the system.
September 15 is also the due date for government offices to submit Form No. 137, where TDS/TCS for the month of August 2026 has been paid without any challan being produced.
September 30 : Taxpayers need to submit challan-cum-statement in Form No. 141 for tax deducted under section 393(1) for August 2026.
An audit report under section 44AB for the Assessment Year 2026-27 must be filed if the taxpayer is a corporate or non-corporate assessee who must submit their ITR by October 31, 2026.
Trusts, funds, hospitals, universities, or any other educational or medical institution must submit an audit report using Form No. 10B/10BB.
By keeping these dates in mind, taxpayers can ensure compliance with Income Tax rules.
