| Event Date | Act | Applicable Form | Obligation |
| 01/09/2019 | Income Tax | N.A. | Wef 1.9.19, TDS @5% u/s 194M on payments for contract/professional work more than 50 lacs pa by individual/HUF not required to deduct TDS u/s 194C& 194J. |
| 07/09/2019 | Income Tax | Form No.27C (TCS) | Submission of Forms received in Aug to IT Commissioner |
| 07/09/2019 | Income Tax | Challan No. ITNS-281 | Payment of TDS Deducted in August |
| 10/09/2019 | Goods and Services Tax | GSTR-8 | Return by e-commerce operators for Aug. |
| 11/09/2019 | Goods and Service Tax | GSTR-1 | Outward supplies of taxable goods and/or services for the Month of August 2019 turnover exceeding 1.5 Cr.) Monthly Return. |
| 13/09/2019 | Goods and Service Tax | GSTR-6 | Return by Input Service Distributor for August |
| 15/09/2019 | Income Tax | Challan No. ITNS-280 | Payment of 45% Advance Income Tax by All (except 44AD & 44ADA cases) |
| 15/09/2019 | Income Tax | Form 16B | Issue of Certificate of TDS on Payment made for purchase of property in July. |
| 20/09/2019 | Goods and Services Tax | Form GSTR-5 & 5A | Return of Inward & Outward Supplies for August by Non-Resident foreign taxable person |
| 20/09/2019 | Goods and Service Tax | GSTR-3B | Payment of GST & filing summary return for August by Regular & Casual Suppliers. |
| 30/09/2019 | Goods and Service Tax | CMP-02 | Availing of Composition Scheme for 2019-20 by Exclusive Suppliers of Services. (Extended date) |
| 30/09/2019 | Income Tax | Form 3CD, 3CA/3CB, 3CEB, Form 29B | E-filing of Tax Audit Report/MAT Audit Report |
| 30/09/2019 | Income Tax | ITR 1 to 7 | Filing of Income Tax returns by Cos, Partnership firms etc. (Audit applicable) |
| 30/09/2019 | Companies Act | BEN-2 | Disclosure by companies of ‘Significant Beneficial Owners’ (SBO). (extended due date) |
| 30/09/2019 | Goods and Services Tax | GSTR-7 | Monthly Return by Tax Deductor for August |
| 30/09/2019 | Income Tax | Form 26QB | Deposit of TDS on payment made for purchase of property in August. |