IMS (Invoice Management System): A Complete Guide to Accept, Reject, and Pending Actions

IMS gives a recipient taxpayer a dashboard of every inward invoice reported by suppliers through their GSTR-1, before it flows into GSTR-2B. For each invoice, the recipient can accept, reject, or leave it pending. Accepted invoices flow into GSTR-2B as eligible ITC; rejected ones are excluded; pending ones roll forward without being consumed either way.

Accepting an invoice is a statement that the goods or services were received and the invoice is genuine — it becomes part of your GSTR-2B and, if otherwise eligible, your claimable ITC for the period. Rejecting excludes it entirely; you'd typically do this for an invoice that doesn't correspond to a real transaction, or duplicates one already recorded.

Leaving an invoice pending defers the decision — useful when goods haven't been received yet, or the invoice needs verification against a purchase order before you commit to claiming the credit. Pending invoices don't count toward GSTR-2B until actioned, so a large pending queue directly suppresses the ITC your GSTR-3B can claim that period.

Rule 37A requires reversing ITC already claimed on an invoice if the supplier subsequently fails to file — or files late and doesn't pay — the corresponding GSTR-3B. IMS is the point where this risk first becomes visible: a supplier's filing status feeds into whether an already-accepted invoice needs a reversal flag in a later period. Teams that only check IMS at filing time, rather than tracking supplier compliance continuously, find these reversals after the fact instead of before.

For a business or CA firm with hundreds or thousands of inward invoices a month, actioning each one individually in the GSTN portal isn't viable. The practical approach is bulk accept/reject/hold with clear rules — auto-accept invoices that match a purchase order and GSTIN with no anomaly, auto-flag ones that don't, and reserve manual review for the exceptions.