Standard Operating Procedure: Scrutiny of GST Returns

The objective of this Standard Operating Procedure (SOP) is to establish a rigorous, standardized framework for the internal scrutiny of Goods and Services Tax (GST) returns. By systematically reconciling tax liabilities, input tax credits (ITC), and compliance filings, this process minimizes the risk of tax notices, interest penalties, and litigation. This procedure ensures that every transaction is audit-ready and aligned with the current provisions of the GST Act and rules.

Phase 1: Data Gathering and Preliminary Reconciliation

• Export GSTR-1, GSTR-3B, and GSTR-2B data for the relevant period from the GST portal.
• Extract the Sales Register and Purchase Register from the internal ERP/Accounting software.
• Perform a high-level summary check: Compare total tax liability declared in GSTR-1 vs. GSTR-3B.
• Ensure all amendments (if any) from previous tax periods have been captured and accounted for in the current filing.

Phase 2: Output Tax Liability Verification

• Reconcile the Sales Register with GSTR-1: Ensure every invoice value, tax rate, and HSN/SAC code matches the data uploaded.
• Verify the Place of Supply (POS): Confirm that Intra-state (CGST/SGST) and Inter-state (IGST) transactions are correctly classified to avoid jurisdictional disputes.
• Check for Zero-rated supplies: Validate that Export invoices/SEZ supplies are correctly flagged and supported by Shipping Bills/ARE-1 forms.
• Exempted and Nil-rated supplies: Confirm these are reported in the correct tables to avoid the need for unnecessary reversals.
• RCM Liability: Ensure that tax on Reverse Charge Mechanism (RCM) supplies has been paid in GSTR-3B and that the corresponding credit is claimed only after the payment.

Phase 3: Input Tax Credit (ITC) Verification

• Reconcile GSTR-2B with the Purchase Register: Ensure that every claimable credit is reflected in the auto-populated 2B statement.
• Vendor Compliance Check: Verify if vendors have filed their GSTR-1/IFF to ensure the credit is not restricted under Rule 36(4).
• Ineligible ITC: Filter the purchase register for blocked credits under Section 17(5) (e.g., food and beverages, membership of clubs, personal use) and ensure these are reversed.
• Reversal of ITC: Confirm mandatory reversals for common credits used for both taxable and exempt supplies (Rule 42/43).
• Payment status: Ensure the 180-day rule is met—verify that payments have been made to vendors; if not, ensure the corresponding ITC is reversed along with applicable interest.

Phase 4: Final Compliance and Filing

• Final Reconciliation Report: Generate a summary report highlighting differences between books and returns, with written explanations for any discrepancies.
• Cash vs. Credit Ledger: Verify that the tax paid in cash matches the challans generated and that the credit ledger balance is accurate post-filing.
• Documentation Archival: Save the GSTR-1 and GSTR-3B PDFs, the 2B statement, and the final reconciliation excel file in a centralized, time-stamped folder.

Pro Tips & Pitfalls

• Pro Tip: Maintain a "Monthly Reconciliation Log" that tracks differences due to timing (e.g., invoices dated in March but appearing in April 2B). This saves hours during an actual department audit.
• Pitfall - Misclassification: Many businesses fail by using incorrect HSN codes. Ensure your HSN master is updated periodically, as this is a primary trigger for system-generated scrutiny notices.
• Pitfall - Post-filing neglect: The most common mistake is filing the return and forgetting to update the status in the accounting software. Always link the GST filing date to your ledger entries.

FAQ

Q1: What should I do if I find a discrepancy between my books and GSTR-2B? A: Immediately communicate with the vendor to ensure they have uploaded the invoice. If the vendor has missed it, request them to file it in the next period. Do not claim the credit until it appears in your GSTR-2B.

Q2: Are there any penalties for late filing even if there is no tax liability? A: Yes, late filing of returns (even NIL returns) attracts a late fee per day under the GST Act. Always ensure NIL returns are filed on time.

Q3: How often should this scrutiny be performed? A: While GST returns are filed monthly, a comprehensive reconciliation should be performed monthly to ensure smooth preparation for the Annual Return (GSTR-9/9C).