Tax Consultant
1470 Points
Posted on 07 July 2026
The biggest issue for most clients is that once you ACCEPT an invoice in IMS, the ITC gets locked in Table 4A and you cannot edit it manually in GSTR-3B anymore. If the supplier later amends the invoice (value or GSTIN correction), the amendment does not auto-update the accepted figure.
The fix requires:
1. Supplier to file an amendment in GSTR-1 Amendment (Table 9A/9B)
2. The correction to reflect in the NEXT month's GSTR-2B
3. You to then re-process in IMS
Means a 1-2 month lag on any supplier correction, during which your GSTR-3B has a wrong ITC figure and you either pay more tax or risk a mismatch notice.
The second pain point: PENDING status in IMS. Many practitioners set invoices to PENDING thinking it is a neutral state. It is not , PENDING means you have not acted and the ITC is excluded from auto-population until you accept or reject. If you file GSTR-3B with auto-populated ITC without processing all pendings, you miss legitimate credits.
For a step-by-step IMS workflow and GSTR-2B reconciliation process, this [GST return filing guide](https://taxgarden.in/gst-return-filing) covers the IMS actions and credit claim flow.