As September was the quarter end (i.e. 2nd quarter of FY 2021-22 Jul-Sep, 2021), hence there are various due dates in the month of October 2021. Below is the GST compliance calendar with all due dates for GST in the month of October 2021.
| Particulars | Period | Due date |
| GSTR-3B | Sep, 2021 | Oct 20th, 2021 |
| GSTR-1 | Sep, 2021 | Oct 11th, 2021 |
| GSTR-1 | Jul-Sep, 2021 | Oct 13th, 2021 |
| GSTR-5 | Sep, 2021 | Oct 20th, 2021 |
| GSTR-6 | Sep, 2021 | Oct 13th, 2021 |
| GSTR-8 | Sep, 2021 | Oct 10th, 2021 |
| GSTR-3B | Jul-Sep, 2021 | Oct 22nd*, 24th**, 2021 |
| IFF (Optional) | Sep,2021 | NA |
| CMP-08 | Jul-Sep, 2021 | Oct 18th, 2021 |
| Other Forms | ||
| GSTR-5A | Sep,2021 | Oct 20th, 2021 |
| GSTR-7 | Sep,2021 | Oct 10th, 2021 |
| RFD-10 | 18 Months after the end of quarter for which refund is to be claimed | |
| ITC-04 | Half Yearly | Oct 25th, 2021 |
*in the States of Chhattisgarh, Madhya Pradesh, Gujarat, Maharashtra, Karnataka, Goa, Kerala, Tamil Nadu, Telangana or Andhra Pradesh or the Union territories of Daman and Diu and Dadra and Nagar Haveli, Puducherry, Andaman and Nicobar Islands and Lakshadweep.
**in the States of Himachal Pradesh, Punjab, Uttarakhand, Haryana, Rajasthan, Uttar Pradesh, Bihar, Sikkim, Arunachal Pradesh, Nagaland, Manipur, Mizoram, Tripura, Meghalaya, Assam, West Bengal, Jharkhand or Odisha or the Union territories of Jammu and Kashmir, Ladakh, Chandigarh and Delhi.
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