Due date for deposit of Tax deducted/collected for the month of August 2026. However, all sums deducted/collected by an office of the government shall be paid to the credit of the Central Government on the same day on which tax is paid without production of an Income-tax Challan.
10 September 2026
GSTR-7 for August 2026 to be filed by persons liable to Tax Deduction at Source (TDS)
GSTR-8 for August 2026 to be filed by E-Commerce Operators liable to Tax Collection at Source (TCS)
11 September 2026
GSTR-1 for August 2026 to be filed by all registered taxpayers not under the QRMP scheme
13 September 2026
GSTR-6 for August 2026 to be filed by Input Service Distributors (ISDs)
Uploading B2B invoices using Invoice Furnishing Facility (IFF) under the QRMP scheme for August 2026 by taxpayers with aggregate turnover of up to INR 50 million
GSTR-5 for August 2026 to be filed by Non-Resident Foreign Taxpayers
14 September 2026
Issue of certificate in Form No. 132 (Income-tax Rules, 2026) under section 395(4) of the Income-tax Act, 2025 for tax deducted at source under section 393(1) [Table Sl. No. 2(i), 3(i), 6(ii) & 8(vi)] of the Income-tax Act, 2025 in the month of July 2026
15 September 2026
Statement in Form 1 (Income-tax Rules, 2026) by the stock exchange for the month of August 2026, in respect of transactions in which client codes have been modified after registering in the system
Due date for furnishing Form No. 137 (Income-tax Rules, 2026) by an office of the Government where TDS/TCS for the month of August 2026 has been paid without the production of a challan
Second installment of advance tax for the Tax Year 2026-27
20 September 2026
GSTR-5A for August 2026 to be filed by Non-Resident Online Database Access and Retrieval (OIDAR) service providers
GSTR-3B for August 2026 to be filed by all registered taxpayers not under the QRMP scheme
25 September 2026
Payment of tax through GST PMT-06 by taxpayers under the QRMP scheme for August 2026
30 September 2026
Furnishing of audit report in Form No. 3CE (Income-tax Rules, 1962) under section 44DA (Income-tax Act, 1961) by a non-resident and foreign company for the previous year 2025-26 (if the assessee is required to submit return of income on October 31 2026)
Furnishing of the report in Form No. 3CEA (Income-tax Rules, 1962) relating to computation of capital gains in case of slump sale taxable under section 50B (Income-tax Act, 1961) (if the assessee is required to submit return of income on October 31 2026)
Furnishing report under section 115JB (Income-tax Act, 1961) in Form No. 29B (Income-tax Rules, 1962) for computing the book profits of the company during the previous year 2025-26 (if the assessee is required to submit return of income on October 31 2026)
Furnishing audit report in Form No. 3AC (Income-tax Rules, 1962) by assessee claiming deduction under section 33AB (Income-tax Act, 1961) for the previous year 2025-26 (if the assessee is required to submit return of income on October 31 2026)
Furnishing of report of audit of the accounts of an assessee, other than a company or a co-operative society, in Form No. 3AE (Income-tax Rules, 1962) under section 35D(4) (Income-tax Act, 1961) for the previous year 2025-26 (if the assessee is required to submit return of income on October 31 2026)
Furnishing audit report in Form No. 3AD (Income-tax Rules, 1962) by assessee claiming deduction under section 33ABA (Income-tax Act, 1961) for the previous year 2025-26 (if the assessee is required to submit return of income on October 31 2026)
Furnishing of report of audit of the accounts of an assessee, other than a company or a co-operative society, in Form No. 3AE (Income-tax Rules, 1962) under section 35E(6) (Income-tax Act, 1961) for the previous year 2025-26 (if the assessee is required to submit return of income on October 31 2026)
Furnishing of audit report in Form no. 3CE (Income-tax Rules, 1962) under section 44DA (Income-tax Act, 1961) by a non-resident and foreign company for the previous year 2025-26 (if the assessee is required to submit return of income on October 31 2026)
Furnishing of statement in Form No. 3AF (Income-tax Rules, 1962) containing the particulars of expenditures specified under Section 35D(2)(a) (Income-tax Act, 1961) (if the assessee is required to submit the return of income on or before October 31 2026)
Furnishing of certificate in Form No. 10-IJ (Income-tax Rules, 1962) issued by a Chartered Accountant certifying the annual statement of exempt income of the specified fund, being a category-III AIF, under section 10(23FF) (Income-tax Act, 1961) (if the assessee is required to submit the return of income on or before October 31 2026)
Furnishing of Audit Report in Form No. 10CCB (Income-tax Rules, 1962) by assessee claiming deduction under section 80-I, 80-IA, 80-IB or section 80-IC (Income-tax Act, 1961) (if the assessee is required to submit the return of income on or before October 31 2026)
Furnishing report in Form No. 10DA (Income-tax Rules, 1962) certifying the claim for additional employee cost under section 80JJAA (Income-tax Act, 1961) during the previous year 2025-26 (if the assessee is required to submit return of income on or before October 31 2026)
Application in Form No. 171 (Income-tax Rules, 2026) for updating details by a person who is already registered as an income-tax practitioner under the Income-tax Act, 1961, holding a valid certificate of registration as on March 31 2026
Furnishing of the report in Form No. 3CEA (Income-tax Rules, 1962) relating to computation of capital gains in case of slump sale taxable under section 50B (Income-tax Act, 1961) (if the assessee is required to submit return of income on October 31 2026)
Furnishing report under section 115JB (Income-tax Act, 1961) in Form No. 29B (Income-tax Rules, 1962) for computing the book profits of the company during the previous year 2025-26 (if the assessee is required to submit return of income on October 31 2026)
Furnishing report under section 115JC (Income-tax Act, 1961) in Form No. 29C (Income-tax Rules, 1962) for computing Adjusted Total Income and Alternate Minimum Tax of the person other than company during the previous year 2025-26 (if the assessee is required to submit return of income on October 31 2026)
Furnishing of Audit Report in Form No. 66 (Income-tax Rules, 1962) by tonnage tax company under clause (ii) of section 115VW (Income-tax Act, 1961) for the previous year 2025-26 (if the company is required to submit return of income on October 31 2026)
Furnishing of the audit report in Form No. 10-IL (Income-tax Rules, 1962) by the specified fund, being the investment division of an offshore banking unit, for the purpose of exemption under section 10(4D) (Income-tax Act, 1961) (if assessee is required to submit return of income on or before October 31 2026)
7 October 2026
Due date for deposit of tax deducted/collected for the month of September 2026. However, all sums deducted/collected by an office of the government shall be paid to the credit of the Central Government on the same day on which tax is paid, without production of challan
Due date for deposit of TDS for the period July 2026 to September 2026 when the Assessing Officer has permitted quarterly deposit of TDS under section 392(1) or 393(1) [Table Sl. Nos. (1)(i) and (ii), and 5(ii) and (iii)] of the Income-tax Act, 2025
Due date for furnishing Form No. 137 (Income-tax Rules, 2026) by an office of the Government where TDS/TCS for the month of September 2026 has been paid without the production of a challan.
Uploading of declarations received in Form No. 127 (Income-tax Rules, 2026) from the buyer in the month of September 2026.
Upload the declarations received from recipients in Form No. 121 (Income-tax Rules, 2026) during the quarter ending September 2026.
10 October 2026
GSTR-7 for September 2026 to be filed by persons liable to TDS
GSTR-8 for September 2026 to be filed by E-Commerce Operators liable to TCS
11 October 2026
GSTR-1 for August 2026 [AS1.1]by all registered taxpayers not under the QRMP scheme
13 October 2026
GSTR-6 for September 2026 to be filed by ISDs
Uploading B2B invoices using IFF under the QRMP scheme for August [AS2.1]2026 by taxpayers with aggregate turnover of up to INR 50 million
GSTR-5 for September 2026 to be filed by Non-Resident Foreign Taxpayers