In September 2025, several key income tax compliance deadlines fall due. On 7th September, taxpayers must deposit TDS/TCS for August 2025 and upload Form 27C declarations. By 14th September, TDS certificates under sections 194-IA, 194-IB, 194M, and 194S (for July 2025) must be issued. The 15th of September is a significant date with multiple obligations, including Form 24G (for Government offices), filing Form 3BB (stock exchanges), payment of the second instalment of advance tax for AY 2026-27, and the extended due date for filing returns of income for AY 2025-26 in non-audit cases. Various statutory statements, declarations, and options relating to sections 80GG, 80RRB, 80QQB, 115BAC, 115BAD, 115BAE, 115BBF, 89, and 89A are also due on this date. By 30th September, challan-cum-statements for TDS deducted in August must be submitted, along with multiple audit reports and certifications under different sections (including 44AB, 10B/10BB, 3AC, 3AD, 3AE, 3CE, 80JJAA, 115JB, and 115JC). September is therefore critical for tax payments, ITR filing, and audit/report submissions.
7 September 2025 –
Due date for deposit of Tax deducted/collected for the month of August, 2025. However, all sum deducted/collected by an office of the government shall be paid to the credit of the Central Government on the same day where tax is paid without production of an Income-tax Challan
7 September 2025 –
Uploading of declarations received in Form 27C from the buyer in the month of August, 2025
14 September 2025 –
Due date for issue of TDS Certificate for tax deducted under section 194-IA in the month of July, 2025
14 September 2025 –
Due date for issue of TDS Certificate for tax deducted under section 194-IB in the month of July, 2025
14 September 2025 –
Due date for issue of TDS Certificate for tax deducted under section 194M in the month of July, 2025
14 September 2025 –
Due date for issue of TDS Certificate for tax deducted under section 194S (by specified person) in the month of July, 2025
15 September 2025 –
Due date for furnishing of Form 24G by an office of the Government where TDS/TCS for the month of August, 2025 has been paid without the production of a challan
15 September 2025 –
Second instalment of advance tax for the assessment year 2026-27
15 September 2025 –
Due date for furnishing statement in Form no. 3BB by a stock exchange in respect of transactions in which client codes been modified after registering in the system for the month of August, 2025
15 September 2025 –
Return of income for the assessment year 2025-26 for all assessee other than (a) corporate-assessee or (b) non-corporate assessee (whose books of account are required to be audited) or (c) partner of a firm whose accounts are required to be audited or the spouse of such partner if the provisions of section 5A applies or (d) an assessee who is required to furnish a report under section 92E.
Note: The due date for furnishing the return of income for Assessment year 2025-26 has been extended from July 31, 2025, to September 15, 2025, vide Circular no. 06/2025, dated 27-05-2025
15 September 2025 –
Statement by scientific research association, university, college or other association or Indian scientific research company as required by rules 5D, 5E and 5F (if due date of submission of return of income is July 31, 2025)*
* The due date for furnishing the return of income for Assessment year 2025-26 has been extended from July 31, 2025, to September 15, 2025, vide Circular no. 06/2025, dated 27-05-2025. Accordingly, the due date for submission of this form/report shall stand extended to September 15, 2025
15 September 2025 –
Furnishing of statement for exercising the option to pay tax at a concessional rate under section 115BBF for income in the nature of royalty arising from patent developed and registered in India (if the assessee is required to submit return of income by July 31, 2025)*
* The due date for furnishing the return of income for Assessment year 2025-26 has been extended from July 31, 2025, to September 15, 2025, vide Circular no. 06/2025, dated 27-05-2025. Accordingly, the due date for submission of this form/report shall stand extended to September 15, 2025
15 September 2025 –
Furnishing of declaration by a taxpayer claiming deduction under section 80GG in respect of the rent paid for residential accommodation (if the assessee is required to submit return of income by July 31, 2025)*
* The due date for furnishing the return of income for Assessment year 2025-26 has been extended from July 31, 2025, to September 15, 2025, vide Circular no. 06/2025, dated 27-05-2025. Accordingly, the due date for submission of this form/report shall stand extended to September 15, 2025
15 September 2025 –
Reporting of details of funds received from eligible persons (either directly or through Alternative Investment Fund) in the previous year 2024-25 (if the assessee is required to submit return of income by July 31, 2025)*
* The due date for furnishing the return of income for Assessment year 2025-26 has been extended from July 31, 2025, to September 15, 2025, vide Circular no. 06/2025, dated 27-05-2025. Accordingly, the due date for submission of this form/report shall stand extended to September 15, 2025
15 September 2025 –
Furnishing of certificate by a resident individual being a patentee claiming deduction under section 80RRB in respect of royalty income on patents (if the assessee is required to submit return of income by July 31, 2025)*
* The due date for furnishing the return of income for Assessment year 2025-26 has been extended from July 31, 2025, to September 15, 2025, vide Circular no. 06/2025, dated 27-05-2025. Accordingly, the due date for submission of this form/report shall stand extended to September 15, 2025
15 September 2025 –
Furnishing of particulars for claiming relief under section 89 (if the assessee is required to submit return of income by July 31, 2025)*
* The due date for furnishing the return of income for Assessment year 2025-26 has been extended from July 31, 2025, to September 15, 2025, vide Circular no. 06/2025, dated 27-05-2025. Accordingly, the due date for submission of this form/report shall stand extended to September 15, 2025
15 September 2025 –
Furnishing of statement for exercising the option to claim relief under section 89A for income arising from retirement benefit account maintained in a notified country at the time of withdrawal or redemption (if the assessee is required to submit return of income by July 31, 2025)*
* The due date for furnishing the return of income for Assessment year 2025-26 has been extended from July 31, 2025, to September 15, 2025, vide Circular no. 06/2025, dated 27-05-2025. Accordingly, the due date for submission of this form/report shall stand extended to September 15, 2025
15 September 2025 –
Exercising the option to opt-out from the new tax regime under section 115BAC (if assessee is required to submit return of income by July 31, 2025)*
* The due date for furnishing the return of income for Assessment year 2025-26 has been extended from July 31, 2025, to September 15, 2025, vide Circular no. 06/2025, dated 27-05-2025. Accordingly, the due date for submission of this form/report shall stand extended to September 15, 2025
15 September 2025 –
Exercising the option to opt for alternative tax regime under section 115BAD by co-operative society (if assessee is required to submit return of income by July 31, 2025)*
* The due date for furnishing the return of income for Assessment year 2025-26 has been extended from July 31, 2025, to September 15, 2025, vide Circular no. 06/2025, dated 27-05-2025. Accordingly, the due date for submission of this form/report shall stand extended to September 15, 2025
15 September 2025 –
Exercising the option to opt for alternative tax regime under section 115BAE by co-operative society (if assessee is required to submit return of income by July 31, 2025)*
* The due date for furnishing the return of income for Assessment year 2025-26 has been extended from July 31, 2025, to September 15, 2025, vide Circular no. 06/2025, dated 27-05-2025. Accordingly, the due date for submission of this form/report shall stand extended to September 15, 2025
15 September 2025 –
Furnishing of details of attribution of capital gain taxable under section 45(4) to the capital asset remaining with the firm, AOP, or BOI after reconstitution (if the firm, AOP, or BOI is required to furnish return of income by July 31, 2025)
* The due date for furnishing the return of income for Assessment year 2025-26 has been extended from July 31, 2025, to September 15, 2025, vide Circular no. 06/2025, dated 27-05-2025. Accordingly, the due date for submission of this form/report shall stand extended to September 15, 2025
15 September 2025 –
Submission of a report from a Chartered Accountant for the previous year 2024-25 relating to arm’s length price of the remuneration paid by an eligible investment fund to the fund manager (if the assessee is required to submit return of income by July 31, 2025)*
* The due date for furnishing the return of income for Assessment year 2025-26 has been extended from July 31, 2025, to September 15, 2025, vide Circular no. 06/2025, dated 27-05-2025. Accordingly, the due date for submission of this form/report shall stand extended to September 15, 2025
15 September 2025 –
Furnishing of certificate by a resident individual being an author (including a joint author) claiming deduction under section 80QQB in respect of royalty income (if the assessee is required to submit return of income by July 31, 2025)*
* The due date for furnishing the return of income for Assessment year 2025-26 has been extended from July 31, 2025, to September 15, 2025, vide Circular no. 06/2025, dated 27-05-2025. Accordingly, the due date for submission of this form/report shall stand extended to September 15, 2025
30 September 2025 –
Due date for furnishing of challan-cum-statement in respect of tax deducted under section 194-IA in the month of August, 2025
30 September 2025 –
Due date for furnishing of challan-cum-statement in respect of tax deducted under section 194-IB in the month of August, 2025
30 September 2025 –
Due date for furnishing of challan-cum-statement in respect of tax deducted under section 194M in the month of August, 2025
30 September 2025 –
Due date for furnishing of challan-cum-statement in respect of tax deducted under section 194S (by specified person) in the month of August, 2025
30 September 2025 –
Due date for filing of audit report under section 44AB for the assessment year 2025-26 in the case of a corporate-assessee or non-corporate assessee (who is required to submit his/its return of income on October 31, 2025)
30 September 2025 –
Application in Form 9A for exercising the option available under Explanation to section 11(1) to apply income of previous year in the next year or in future (if the assessee is required to submit return of income on November 30, 2025)
30 September 2025 –
Statement in Form no. 10 to be furnished to accumulate income for future application under section 10(21) or section 11(1) (if the assessee is required to submit return of income on November 30, 2025)
30 September 2025 –
Furnishing of Audit report in Form no. 10B/10BB by a fund or trust or institution or any university or other educational institution or any hospital or other medical institution
30 September 2025 –
Furnishing audit report in Form 3AC by assessee claiming deduction under section 33AB for the previous year 2024-25 (if the assessee is required to submit return of income on October 31, 2025)
30 September 2025 –
Furnishing audit report in Form 3AD by assessee claiming deduction under section 33ABA for the previous year 2024-25 (if the assessee is required to submit return of income on October 31, 2025)
30 September 2025 –
Furnishing of report of audit of the accounts of an assessee, other than a company or a co-operative society, in Form No. 3AE under section 35D(4) for the previous year 2024-25 (if the assessee is required to submit return of income on October 31, 2025)
30 September 2025 –
Furnishing of report of audit of the accounts of an assessee, other than a company or a co-operative society, in Form No. 3AE under section 35E(6) for the previous year 2024-25 (if the assessee is required to submit return of income on October 31, 2025)
30 September 2025 –
Furnishing of statement containing the particulars of expenditures specified under Section 35D(2)(a) (if the assessee is required to submit return of income by October 31, 2025)
30 September 2025 –
Furnishing of audit report in Form 3CE under section 44DA by non-resident and foreign company for the previous year 2024-25 (if the assessee is required to submit return of income on October 31, 2025)
30 September 2025 –
Furnishing of audit report relating to computation of capital gains in case of slump sale (if the assessee is required to submit return of income on October 31, 2025)
30 September 2025 –
Furnishing of report in Form No. 10CCF certifying that the amount of deduction under section 80LA has been correctly claimed during the previous year 2024-25 (if the assessee is required to submit return of income on October 31, 2025)
30 September 2025 –
Furnishing report certifying the claim for additional employee cost under section 80JJAA during the previous year 2024-25 (if the assessee is required to submit return of income on October 31, 2025)
30 September 2025 –
Furnishing report under section 115JB for computing the book profits of the company during the previous year 2024-25 (if the assessee is required to submit return of income on October 31, 2025)
30 September 2025 –
Furnishing report under section 115JC for computing Adjusted Total Income and Alternate Minimum Tax of the person other than company during the previous year 2024-25 (if the assessee is required to submit return of income on October 31, 2025)
30 September 2025 –
Furnishing of Audit Report under clause (ii) of section 115VW for the previous year 2024-25
30 September 2025 –
Furnishing of audit report by the specified fund, being the investment division of an offshore banking unit, for the purpose of exemption under section 10(4D) (if assessee is required to submit return of income by October 31, 2025)
30 September 2025 –
Furnishing of certificate issued by Chartered Accountant certifying annual statement of exempt income of specified fund, being a category-III AIF, under section 10(23FF)
