1. Understanding the Monthly GST Filing Timeline
For normal taxpayers in India, monthly compliance follows a strict calendar rhythm: GSTR-1 (Outward Supplies) is due by the 11th of the following month, the static GSTR-2B statement is generated on the 14th, and GSTR-3B (Summary Tax Return and Payment) must be filed by the 20th. Missing these deadlines triggers cumulative late fees under Section 47 and mandatory interest at 18% per annum under Section 50.
2. Pre-Filing Invoice Validation Checklist
Before compiling GSTR-1, verify the following details: (a) Verify that all B2B customer GSTINs are valid and active; (b) Confirm that correct HSN codes (minimum 6 digits for turnovers above ₹5 Crore) are assigned; (c) Validate that the Place of Supply (POS) matches the delivery state to ensure accurate CGST/SGST vs. IGST classification.
3. Maximizing Input Tax Credit via GSTR-2B Matching
Under Section 16(2)(aa) of the CGST Act, taxpayers cannot claim Input Tax Credit unless the corresponding invoice has been uploaded by the supplier and appears in GSTR-2B. Reconcile purchase registers against GSTR-2B to identify supplier defaults, blocked credits under Section 17(5), and reverse charge liabilities under Section 9(3).
4. Preparing GSTR-3B and Cash Ledger Offset
Once ITC is verified, calculate your net tax liability in GSTR-3B. Ensure electronic credit ledger balances are utilized in the correct statutory sequence (IGST credit first against IGST, then CGST/SGST) before generating a PMT-06 challan to pay any cash balance via net banking or UPI.
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