Report on September 2025 Tax Compliance Deadlines

1. Executive Summary & Introduction

September 2025 marks a crucial period for tax compliance in India, presenting a convergence of statutory obligations for both direct and indirect taxes. The month is defined by the extended due date for Income Tax Return (ITR) filing for a significant segment of taxpayers, the third installment of advance tax payments, and the regular monthly and quarterly Goods and Services Tax (GST) return submissions. This report provides a detailed, authoritative analysis of these deadlines, recent regulatory circulars from the Central Board of Direct Taxes (CBDT) and the Central Board of Indirect Taxes and Customs (CBIC), and the broader implications for taxpayers and compliance professionals.

A clear understanding of the fiscal timeline is essential for navigating these requirements. The compliance obligations discussed herein pertain to the Financial Year (FY) 2024-25, which spanned from April 1, 2024, to March 31, 2025. The income earned during this period is assessed and taxed in the subsequent Assessment Year (AY) 2025-26. This report goes beyond a simple calendar of dates to provide a comprehensive analysis of the underlying regulatory environment, strategic considerations, and the quantifiable impact of non-compliance, making it a vital resource for finance managers, tax professionals, and compliance officers.  

2. Income Tax Compliance Deadlines

2.1. The Extended Income Tax Return (ITR) Filing Deadline

The government has provided a significant administrative relief by extending the ITR filing deadline for the Financial Year 2024-25 (Assessment Year 2025-26) to September 15, 2025. This extension applies specifically to taxpayers who are not required to get their accounts audited, such as salaried individuals, pensioners, and other non-audit cases. The original deadline for these taxpayers was July 31, 2025.  

It is important to note that this extension does not apply universally. For taxpayers whose accounts are subject to a mandatory tax audit, the due date for filing their ITR remains unchanged at September 30, 2025. Similarly, businesses that are required to furnish a transfer pricing report have a due date of  

November 30, 2025.  

The decision to extend the deadline to September 15, 2025, was not a routine administrative measure but a direct response to a series of systemic challenges that have complicated the compliance process for the current assessment year. A formal representation from the Chandigarh Chartered Accountants Taxation Association (CCATAX) highlighted several critical issues faced by taxpayers and professionals. These included persistent technical glitches on the Income Tax Department’s e-filing portal, such as server crashes, session timeouts, upload failures, and significant data mismatches between the Annual Information Statement (AIS) and Form 26AS.  

These technical disruptions, coupled with a three-month delay in the release of the ITR and Tax Audit utilities for FY 2024-25, created a severely compressed compliance window. The delays in utility rollout and frequent changes in schema and formats forced software vendors and tax professionals to repeatedly update their systems, leaving a technically insufficient period for accurate and error-free submissions. Furthermore, natural calamities, including severe rains and floods in various states, added to the operational difficulties by causing power outages and disrupting connectivity. The measurable impact of these difficulties is evident in the filing statistics; as of August 20, 2025, only 3.35 crore returns had been filed, representing a shortfall of over 4 crore returns compared to the previous year’s figures for a similar period. This shortfall clearly demonstrated that the required daily filing rate to meet the original deadline was operationally unfeasible, making the extension a necessary corrective action to ensure the integrity of the tax administration process.  

2.2. Advance Tax Payment Deadlines

In addition to ITR filing, September is a key month for advance tax compliance. The third installment of estimated tax for the financial year 2025-26 is due on September 15, 2025. This obligation applies to individuals and corporations who are required to pay tax in a phased manner throughout the year under the “pay-as-you-earn” system. Timely payment of this installment is critical to avoid interest and other penalties for late payment.  

2.3. TDS & TCS Compliance Deadlines

Tax Deducted at Source (TDS) and Tax Collected at Source (TCS) obligations also fall within September’s calendar. The monthly deadline for depositing TDS deducted and TCS collected during the month of August 2025 is September 7, 2025. A notable exception exists for payments of TDS on the sale of immovable property (Form 26QB), rent (Form 26QC), and payments to contractors and professionals (Form 26QD), where the deadline is

30 days from the end of the month of deduction. Consequently, the due date for such deductions made in August 2025 is  

September 30, 2025.  

A significant regulatory development is CBDT Circular No. 9/2025, issued on July 21, 2025. This circular provides much-needed relief to deductors and collectors who have faced issues due to the Permanent Account Number (PAN) of deductees being inoperative because it was not linked with Aadhaar. The circular clarifies that a deductor will not face a demand for short deduction if the tax was deducted at a lower rate, provided the PAN is made operative by linking with Aadhaar on or before a stipulated deadline. Specifically, for payments made between April 1, 2024, and July 31, 2025, this relief is applicable if the PAN is made operative by September 30, 2025. For transactions on or after August 1, 2025, the PAN must be made operative within two months from the end of the month of the transaction. This circular represents a strategic move by the CBDT to alleviate systemic hardships and demonstrate a responsive approach to enforcement, prioritizing compliance over immediate penalty collection in this specific, high-friction scenario.  

2.4. Key Documentation for ITR Filing (AY 2025-26)

The extended ITR deadline provides taxpayers with an opportunity to meticulously prepare their returns. The persistent data mismatches and technical issues on the e-filing portal mean that taxpayers cannot rely solely on the auto-populated data. A thorough reconciliation of information is critical to avoid future notices and demands from the tax department. Essential documents to be gathered and cross-verified include Form 16, Form 26AS, the Annual Information Statement (AIS), the Taxpayer Information Summary (TIS), bank statements, and proofs for tax-saving investments and expenditures.  

3. Goods and Services Tax (GST) Compliance Deadlines

3.1. GSTR-1 & GSTR-3B: The Core Returns

The core of GST compliance in September revolves around the filing of returns for the August 2025 tax period. For businesses with an annual turnover exceeding ₹5 crore, the due date for filing GSTR-1 (outward supplies) for the month of August is September 11, 2025. Following this, the due date for filing the summary return  

GSTR-3B for August is September 20, 2025.  

For taxpayers who have opted for the Quarterly Return Monthly Payment (QRMP) scheme, which is available for businesses with a turnover of up to ₹5 crore, the quarterly due dates apply. For the July-September 2025 quarter, the due date for GSTR-1 is October 13, 2025. The deadline for  

GSTR-3B for this quarter is staggered by state, falling on either October 22 or October 24, 2025. This system of staggered due dates is a deliberate administrative strategy to prevent system overload and ensure the stability of the GST Network (GSTN) by distributing the filing burden throughout the month.  

3.2. Specialized GST Return Deadlines

Several other specialized GST returns are also due in September for the preceding month of August. Entities that are required to deduct GST at source must file GSTR-7 by September 10, 2025. Similarly, e-commerce operators who collect Tax at Source (TCS) on supplies made through their platforms are required to file  

GSTR-8 by September 10, 2025.  

In a recent advisory, the CBIC urged the public and media to refrain from speculating on potential changes in GST rates ahead of the GST Council meeting scheduled for September 3-4, 2025. This public statement is a form of proactive market communication, signaling the government’s awareness of the economic impact of tax policy announcements and its efforts to prevent volatility and manage public expectations.  

3.3. The Maharashtra GSTR-3B Extension: A Case Study

The GST administration demonstrated a remarkable degree of agility and responsiveness by extending the GSTR-3B filing deadline for the month of July 2025. While the standard due date was August 20, 2025, the CBIC extended it to August 27, 2025, for taxpayers in specific Maharashtra districts, including Mumbai City, Mumbai Suburban, Thane, Raigad, and Palghar. This targeted extension was granted due to “incessant rains and disruption of public life” in these regions. This measure, following established precedents for providing relief during natural calamities, showcases the GST system’s capacity for issuing swift, geographically-specific notifications to mitigate the impact of unforeseen external events. This contrasts with the broader, more complex issues affecting the Income Tax portal, which required formal representation from a professional body to secure a nationwide extension.  

4. Consequences of Non-Compliance

Failing to meet tax compliance deadlines can result in significant financial penalties. The structure of these penalties is designed to incentivize timely filing and payment across all tax types.

4.1. Penalties for Delayed Income Tax Filing & Payment

• Late Filing Fee (Section 234F): If a taxpayer fails to file their ITR by the due date, a late filing fee is imposed. For taxpayers with a total income exceeding ₹5 lakh, the penalty is ₹5,000. For those with a total income up to ₹5 lakh, the fee is capped at a reduced amount of ₹1,000. This tiered penalty structure demonstrates a progressive approach by the tax authorities, aiming to place a lighter financial burden on lower-income taxpayers while encouraging compliance across all income brackets.  
• Interest on Late Payment (Section 234A): In addition to a late filing fee, taxpayers are liable to pay interest at a rate of 1% per month or part of a month on the unpaid tax amount. This interest accrues from the ITR due date until the return is filed and the tax is paid in full.  

4.2. Penalties for Delayed TDS/TCS Compliance

• Late Filing Fees (Section 234E): A late fee of ₹200 per day of delay is charged for the late filing of a TDS or TCS return. This fee is capped at the total amount of TDS or TCS that was required to be deposited.  
• Penalty by Assessing Officer (Section 271H): A more severe penalty, ranging from ₹10,000 to ₹1,00,000, can be imposed by the Assessing Officer for the non-filing of a TDS/TCS return or for providing incorrect details.  
• Interest on Late Deduction or Deposit (Section 201): Interest is a mandatory charge for delayed TDS actions. It is levied at 1% per month if tax is not deducted on time and at 1.5% per month if the tax is deducted but not deposited with the government on time. The combination of a fixed daily fee and a per-month interest penalty on the tax amount creates a dual-pronged enforcement mechanism. The daily fee incentivizes quick filing, while the interest component penalizes the retention of government funds, regardless of the filing status.  

4.3. Penalties for Delayed GST Compliance

• Late Fees: A daily late fee of ₹50 is charged for a normal GSTR-3B return, while a reduced fee of ₹20 per day is applicable for a Nil return. The maximum late fee is tiered based on the business’s annual turnover, with a ceiling of up to   ₹10,000 for businesses with turnover exceeding ₹5 crore. The penalty for a nil return is a strategic measure by the tax department to ensure that all taxpayers, even those with no transactions, remain active in the system, which helps maintain a clean and up-to-date registry and simplifies compliance monitoring.  
• Interest: A delayed payment of GST attracts an interest charge of 18% per annum, calculated on the net tax liability from the day after the due date until the payment is made.  

5. Strategic Recommendations & Proactive Compliance

Navigating the complexities of tax compliance in September 2025 requires a proactive and strategic approach. It is a high-risk strategy for taxpayers to rely on the government to announce extensions, as the reasons for such extensions—systemic failures and natural disasters—are unpredictable. A robust compliance strategy must account for potential system instability and external shocks.

Taxpayers should view the extended ITR filing deadline as an opportunity for meticulous preparation. The known challenges with data mismatches between AIS and Form 26AS underscore that these documents should be treated as a guide, not a final record. A thorough, line-by-line reconciliation of pre-filled data with personal books of accounts, bank statements, and other financial records is the only way to mitigate the risk of future penalties and demand notices from the tax department.  

For businesses affected by the inoperative PAN issue, leveraging the relief provided by CBDT Circular No. 9/2025 is a critical priority. Deductors must immediately communicate with affected parties to ensure the PAN-Aadhaar linkage is completed by September 30, 2025, to avoid the imposition of penalties for short deduction.

6. Appendices

6.1. Comprehensive September 2025 Tax Calendar (India)

Date	Compliance Obligation	Relevant Form / Return	Applicable Tax	Primary Sources
September 7	Monthly TDS/TCS Deposit	Challan	Income Tax
September 10	GSTR-7 Filing (TDS Deductors)	GSTR-7	GST
September 10	GSTR-8 Filing (E-commerce operators)	GSTR-8	GST
September 11	GSTR-1 Filing (Monthly)	GSTR-1	GST
September 15	ITR Filing for non-audit cases	ITR forms	Income Tax
September 15	Third Installment of Advance Tax	Form 1040-ES	Income Tax
September 20	GSTR-3B Filing (Monthly)	GSTR-3B	GST
September 30	ITR Filing for audit cases	ITR forms	Income Tax
September 30	TDS Deposit on property/rent without TAN	Form 26QB, 26QC, 26QD	Income Tax
September 30	PAN-Aadhaar linkage for Circular No. 9/2025 relief (for transactions from 01.04.24 to 31.07.25)	N/A	Income Tax

6.2. Table of Non-Compliance Penalties

Tax Type	Nature of Default	Relevant Section	Penalty / Fee / Interest Rate	Primary Sources
Income Tax	Late ITR Filing	234F	₹5,000 (Income > ₹5 Lakh); ₹1,000 (Income ≤ ₹5 Lakh)
Income Tax	Late Payment	234A	1% per month on unpaid tax amount
TDS / TCS	Late Filing of Return	234E	₹200 per day of delay (capped at tax amount)
TDS / TCS	Late Deduction	201	1% per month
TDS / TCS	Late Deposit of Deducted Tax	201	1.5% per month
GST	Late Filing of GSTR-3B	N/A	₹50 per day (Normal); ₹20 per day (Nil)
GST	Late Payment of Tax	N/A	18% per annum on net tax liability