5 Tax Deadlines in September: Are You Ready?

September 2026 packs in multiple tax deadlines — TDS deposits, advance tax, and audit reports. Missing even one can trigger penalties, interest charges, or worse, a scrutiny notice from the Income Tax Department. Here's what you must do and by when.

Here's what happened: The Income Tax Department has multiple compliance deadlines in September 2026, including TDS/TCS deposit by the 7th and advance tax instalment by the 15th.. Taxpayers liable for a tax audit — businesses above ₹1 crore turnover, professionals above ₹50 lakh — must submit their audit report by September 30.. Missing these deadlines triggers penal interest under Sections 234B and 234C at 1% per month, plus a flat penalty of up to ₹1.5 lakh for audit report delays..

What you should do: Check your Form 26AS and AIS on the income tax portal this week to verify all TDS credits are correctly reflected before the 7th.. Calculate your advance tax liability now — if your total tax due for FY2026–27 exceeds ₹10,000, pay at least 45% by September 15 to avoid Section 234C interest.. If you run a business or professional practice, confirm with your CA that your tax audit report will be filed by September 30 to avoid penalties..

Even if your employer deducts TDS, freelance income, rent received, or capital gains can push your personal advance tax liability above ₹10,000 — making you individually responsible for September 15 payment.

For readers weighing their credit and loan options, our personal loan guide and CIBIL score resources put this update in context.