| Event Date | Act | Applicable Form | Obligation |
| 05/10/2018 | Companies Act | DIR-3 KYC | Last Date to file DIR-3 KYC by director having DIN with approved status as on 31.03.2018.DIR-3 KYC can be filed till 5.10.18 with reduced late fee of Rs. 500. Normal late fee of Rs. 5000 shall be applicable wef 6.10.18. MCA Notification of 20.9.18. |
| 07/10/2018 | Income Tax | Form No.27C (TCS) | Submission of Forms received in Sep to IT Commissioner |
| 07/10/2018 | Income Tax | Challan No.ITNS-281 | Payment of TDS/TCS deducted/collected in Sep |
| 14/10/2018 | Income Tax | Form 16B | Issue of TDS Certificate for tax deducted under Sec. 194IA for the month of August |
| 14/10/2018 | Income Tax | Form 16C | Issue of TDS Certificate for tax deducted under Sec.194IB for the month of August |
| 15/10/2018 | Income Tax | Form 27EQ | TCS Returns by ALL Collectors. |
| 15/10/2018 | Providend Fund | Electronic Challan cum Return (ECR) | E-Payment of PF for Sep |
| 15/10/2018 | ESI | ESI Challan | Payment of ESI of Sep |
| 15/10/2018 | Income Tax | Form 16B | Issue of TDS certificate in case of payment /credit made in Aug for purchase of property u/s 194IA. |
| 15/10/2018 | Income Tax | Form No.15CC | Statement by Banks etc. in respect of foreign remittances during the quarter |
| 20/10/2018 | Goods and Service Tax | Form GSTR-3B | Payment of GST and filing of Return for Inward & Outward Supplies for Sep. by Regular & Casual Suppliers. |
| 20/10/2018 | Goods and Service Tax | Form GSTR-5 & 5A | Return of Inward & Outward Supplies for Sep. by Non-Resident foreign taxable person. |
| 30/10/2018 | Income Tax | Form 27D | Issue of QuarterlyTCS Certificates by ALL Collectors |
| 30/10/2018 | Income Tax | Form No.26QB | Payment of TDS for Purchase of Property for Sep |
| 30/10/2018 | ROC | AOC-4 | Annual Accounts filing on MCA |
| 30/10/2018 | Income Tax | Form 26QB | Challan-cum-statement in respect of tax deducted under Sec.194IA for the month of September |
| 30/10/2018 | Income Tax | Form 26QC | Challan-cum-statement in respect of tax deducted under Sec.194IB for the month of September |
| 31/10/2018 | Goods and Service Tax | Form GSTR-1 | Return of Outward Supplies for July, 2018 to September, 2018 by Regular Suppliers.(Turnover upto 1.5 cr.) |
| 31/10/2018 | Income Tax | ITR | ITR of Companies & a person whose accounts are required to be audited. |
| 31/10/2018 | Goods and Service Tax | Form GSTR-1 | Return of Outward Supplies for July, 2018 by Regular Suppliers. (Turnover exceed 1.50cr.) |
| 31/10/2018 | Income Tax | Return No.24Q, 26Q, & 27Q | TDS returns for Sep Quarter by All deductors |
| 31/10/2018 | Income Tax | Form 61 | E-filing of information of declarations in Form 60 received upto 30th Sep. |