GST Compliance Calendar October 2021

This post provides GST Compliance Calendar for the month of October 2021. GST compliance has been and will continue to be a challenging task. With many deadlines approaching this month, take note of these dates and stay GST compliant. Below mentioned return forms are to be filed for monthly (Sept’21)/ Quarterly (July’21-Sept’21) returns.

GST Compliance Calendar


  • The due dates are subject to change as and when notified by government.

*Applicable for the states- Chhattisgarh, Madhya Pradesh, Gujarat, Maharashtra, Karnataka, Goa, Kerala, Tamil Nadu, Telangana and Andhra Pradesh, the Union territories of Daman and Diu, Dadra and Nagar Haveli, Puducherry, Andaman and Nicobar Islands and Lakshadweep

**Applicable for the states-Himachal Pradesh, Punjab, Uttarakhand, Haryana, Rajasthan, Uttar Pradesh, Bihar, Sikkim, Arunachal Pradesh, Nagaland, Manipur, Mizoram, Tripura, Meghalaya, Assam, West Bengal, Jharkhand and Odisha, the Union territories of Jammu and Kashmir, Ladakh, Chandigarh and Delhi

Important points for filing of September Return

Our Comments

Reconciliation of the following should be done before filing the returns for Sept’2021

  • GSTR-3B vs GSTR-2A/2B-ITC availed as per GSTR 3B and ITC available as per GSTR 2A shall be reconciled GSTIN wise and invoice-wise, and adjustments thereof shall be accounted for before filing of return
  • GSTR-1 vs GSTR-3B- Outward Supply reported as per GSTR 3B and GSTR 1 for FY 20-21 should be reconciled, any differences found shall be rectified before filing of return.
  • ITC as per rule 36(4) – 5% of the eligible credit as per GSTR-2A/2B-Provisional Credit claimed and the credit actually claimable as per Rule 36(4) of CGST rules shall be matched and accordingly adjusted before filing of return.
  • Re-computation of reversal under Rule 42 and 43Reversal or claim of the Input Tax Credit which is determined on re-computation of reversal on completion of the financial year is required to be accounted for before filing of returns.
  • GST credit note – GST credit note pertaining to supplies made in FY 2020-21 can be issued not later than the due date of filing of GSTR-3B for Sep 2020 month i.e. Oct 20, 2020. Therefore, GST credit notes pertaining to FY 20-21, if any pending, shall be issued and reported before filing of return for recording any tax adjustments pertaining to the same.
  • GSTR vs books of Accounts
  • Sales and Purchases as per the Books of Accounts and as per the returns filed shall be reconciled to account for differences, if any.
  • Expenses on which GST is paid as per GSTR-3B and expenses on which GST is payable on Reverse Charge basis as per Books of accounts

Note: The above points should be kept in mind to avoid any scrutiny notices being issued by the department. It should be also done to identify any liability which has been declared by the vendor but credit is not taken on the same by the due date for filing returns for September or the due date of filing annual returns whichever is earlier.

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October 2021