September carries seven filings and is the month most commonly missed.
The tax audit report and Director KYC both fall on the 30th. They are unrelated obligations owed to different authorities that happen to share a date, and one is routinely forgotten because the other is consuming the week.
The night shift02:04 am
Current a/c ···4417 · 05 SepRENT UNIT 4₹40,000
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September 2026 filings
7 due dates
07Mon
TDS / TCS monthly depositIncome Tax · Monday
Challan 281
11Fri
GSTR-1 monthly returnGST · Friday
GSTR-1
15Tue
PF & ESI contributionLabour / PT · Tuesday
ECR
20Sun
GSTR-3B monthly returnGST · Sunday
GSTR-3B
21Mon
Professional tax depositLabour / PT · Monday
PT Challan
30Wed
Tax audit report filingIncome Tax · Wednesday
Form 3CA-3CD
30Wed
Director KYCMCA / ROC · Wednesday
DIR-3 KYC
Weekdays shown are the calendar day each date falls on. We do not adjust dates for weekends or holidays — ask us if a date falls awkwardly for you.
Who has to file these
Not every filing in September applies to every business. Below is what binds each one, taken from the same rule set behind the compliance checker.
Applicability
7 filings
Challan 281
TDS / TCS monthly depositAny entity holding a TAN and deducting tax at source.
07 Sep
GSTR-1
GSTR-1 monthly returnAny entity registered for GST.
11 Sep
ECR
PF & ESI contributionAny entity running a payroll.
15 Sep
GSTR-3B
GSTR-3B monthly returnAny entity registered for GST.
20 Sep
PT Challan
Professional tax depositAny entity running a payroll.
These are the obligations we track for the standard statutory position. Sector rules, state-level professional tax and one-off events can add to them, and extensions can move a date. Ask us before relying on this for a filing.
Want September's filings handled for you?
Send us your entity type and registrations. We will confirm which of these apply and take the filing off your desk.