The Portal Will Block You: A CA's Survival Guide to ITC Reconciliation After GSTR-3B Hard-Locking



Quick Summary
The GSTR-3B portal is becoming stricter, with outward liability already non-editable and ITC hard-locking on the horizon. This means mismatches between your purchase register and GSTR-2B will become locked-in errors that cannot be fixed within GSTR-3B. The traditional method of manual reconciliation in Excel is becoming obsolete. This guide provides a 7-step checklist to ensure accurate ITC claims by catching problems early, before they enter the system, and preparing for future GST compliance changes.

If you're a practicing CA handling 30-50 GST clients, here's the question that should keep you up at night: what happens when Table 4 of GSTR-3B gets hard-locked? Outward liability in GSTR-3B is already non-editable since July 2025. The GSTN advisory dated 7th June 2025 made that permanent. No more "Proceed Anyway" buttons. No manual adjustments. If your GSTR-1 data doesn't match, the portal simply blocks you. Now, with the IMS (Invoice Management System) fully operational and the new "Rejecte
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