| Due Date of Filing | Act | Perticulars | Applicable Form | Download Form |
| 07-05-2026 | Income Tax Act 2025 | Due date for deposit of Tax deducted/collected for the month of April, 2026. 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 a challan. | . | Download |
| 07-05-2026 | Income Tax Act 2025 | Declaration under section 394(2) of the Income-tax Act 2025 to be made by a buyer for obtaining goods without collection of tax in the month of April, 2026 | . | Download |
| 10-05-2026 | GST ACT 2017 | Due date for filing GSTR-7 to be filed by the person who is required to deduct TDS under GST Act for the month of April 2026 | GSTR-7 | Download |
| 10-05-2026 | GST ACT 2017 | Summary of Tax collected at source from E-Commerce Operator under GST act for the month of April 2026 | GSTR-8 | Download |
| 11-05-2026 | GST ACT 2017 | GST Filing of monthly Statement of Outward Supplies by a registered person with aggregate turnover exceeding INR 5 Crores during the preceding financial year or any registered person has opted to file a monthly return for April 2026 | GSTR-1 | Download |
| 13-05-2026 | GST ACT 2017 | Details of B2B Supply of a registered person with turnover less than INR 5 Crores during the preceding year and who has opted for quarterly filing of return under QRMP. | GSTR-1 IFF | Download |
| 13-05-2026 | GST ACT 2017 | Details of Input Tax Credit (ITC) received and distributed by an Input Service Distributors (ISD) for April 2026. | GSTR-6 | Download |
| 13-05-2026 | GST ACT 2017 | Summary of outward taxable supplies and tax payable by a non-resident taxable person for April 2026. | GSTR-5 | Download |
| 15-05-2026 | Income Tax Act 2025 | Due date for issue of TDS Certificate for tax deducted under section 194-IA, 194-IB, 194M and (Income-tax Act, 1961) in the month of March, 2026 | . | Download |
| 15-05-2026 | Income Tax Act 1961 | Due date for furnishing of Form No - 137 (IT act 2025) Formerly 24G (Income-tax Rules, 1962) by an office of the Government where TDS/TCS for the month of April, 2026 has been paid without the production of a challan | FN 137 | Download |
| 15-05-2026 | . | Monthly statement in prescribed Form by stock exchange in respect of transactions in which client codes been modified after registering in system for the month of April, 2026 | . | Download |
| 15-05-2026 | Income Tax Act 1961 | Quarterly statement of TCS deposited for the quarter ending March 31, 2026 | 27EQ4 | Download |
| 15-05-2026 | . | Due date for furnishing statement by a recognised association in respect of transactions in which client codes have been modified after registering in the system for the month of April, 2026 | . | Download |
| 20-05-2026 | GST ACT 2017 | Summary of outward taxable supplies and tax payable by a person supplying OIDAR services for April 2026. | GSTR-5A | Download |
| 20-05-2026 | GST ACT 2017 | GST Filing of returns by a registered person with aggregate turnover exceeding INR 5 Crores during the preceding financial year for April 2026. | GSTR-3B | Download |
| 25-05-2026 | GST ACT 2017 | Payment of GST by Registered person opted to file return under QRMP Scheme for April 2026 | PMT-06 | Download |
| 28-05-2026 | GST ACT 2017 | Statement of inward supplies received by persons having Unique Identification Number (UIN) for April 2026 | GSTR-11 | Download |
| 30-05-2026 | Income Tax Act 1961 | Issue of TCS certificates for the 4th Quarter of the Financial Year 2025-26 | . | Download |
| 30-05-2026 | Income Tax Act 1961 | Due date for e-filing of annual statement of reportable accounts as required to be furnished under section 285BA(1)(k) (Income-tax Act, 1961) (in Form No. 61B) for calendar year 2025 by reporting financial institutions | SFT FY 2025-26 | Download |
| 30-05-2026 | Income Tax Act 2025 | Challan-cum-statement of deduction of tax under section 393(1) of the Income-tax Act 2025 [Table Sl. No. 2(i), 3(i), 6(ii) & 8(vi) in the month of April, 2026 | . | Download |
| 31-05-2026 | . | Application for allotment of PAN where a person’s total income exceeds the maximum amount not chargeable to income-tax during any Financial Year and no PAN has been allotted to him. | . | Download |
| 31-05-2026 | Income Tax Act 2025 | Application for allotment of PAN in case of person being managing director, director, partner, trustee, author, founder, karta, chief executive officer, principal officer or office bearer of the person referred to in prescribed Rule or any person competent | pan | Download |
| 31-05-2026 | Income Tax Act 1961 | Quarterly statement of TDS deposited for the quarter ending March 31, 2026 | 24Q4+26Q4 | Download |
| 31-05-2026 | Income Tax Act 1961 | Due date for furnishing of statement of financial transaction (in Form No. 61A) as required to be furnished under sub-section (1) of section 285BA (Income-tax Act, 1961) with respect to the financial year 2025-26 | SFT-61A | Download |
| 31-05-2026 | Income Tax Act 1961 | Statement in Form no. 10 (Income-tax Rules, 1962) to be furnished to accumulate income for future application under Section 10(21) or Section 11(1) (Income-tax Act 1961) (if the assessee is required to submit return of income on or before July 31, 2026) | FN-10 | Download |
| 31-05-2026 | Income Tax Act 1961 | Application in Form 9A (Income-tax Rules, 1962) for exercising the option available under Explanation to Section 11(1) (Income-tax Act 1961) to apply income of previous year in the next year or in future (if the assessee is required to submit return of income on or before July 31, 2026) | FN-9A | Download |
| 31-05-2026 | Income Tax Act 1961 | Statement of donation in Form 10BD (Income-tax Rules, 1962) to be furnished by reporting person under Section 80G(5)(iii) or section Section 35(1A)(i) (Income-tax Act 1961) in respect of the financial year 2025-26 | FN-10BD | Download |
| 31-05-2026 | Income Tax Rules 1962 | Certificate of donation in Form no. 10BE (Income-tax Rules, 1962) as referred to in Section 80G(5)(ix) or Section 35(1A)(ii) (Income-tax Act 1961) to the donor specifying the amount of donation received during the financial year 2025-26. | FN-10BE | Download |
