The Invoice Management System has turned input tax credit from something a business claims into something it must actively approve, invoice by invoice. With GSTR-2B now built from the actions a taxpayer takes inside the IMS, silence has a price, and the reconciliation that used to happen at the margins now sits at the centre of monthly compliance.
For most of the GST era, input tax credit flowed in one direction: a supplier filed, the system populated a statement, and the recipient claimed what appeared. The Invoice Management System changes the grammar of that process. From October 2025, the recipient is no longer a passive reader of an auto-populated statement but an active gatekeeper, required to look at each inward invoice, credit note and debit note and decide whether to accept it, reject it, or keep it pending. The credit a business can claim is now the credit it has consciously approved.
The mechanism is deceptively simple. Documents uploaded by suppliers land in the recipient's IMS dashboard. Records marked 'Accepted' flow into GSTR-2B and become eligible input tax credit; records 'Rejected' do not; records left 'Pending' are deferred for one tax period before they must be addressed. GSTR-2B continues to be generated on the fourteenth of the month, but it is now a function of these actions, and it can be regenerated if a taxpayer acts in the IMS after the fourteenth but before filing GSTR-3B. The statement is no longer a given; it is an output of what the business does.
The most consequential rule is the one that governs inaction. If a taxpayer takes no action on an invoice before filing GSTR-3B, the system applies deemed acceptance and the invoice is treated as accepted. That is convenient for genuine supplies, but it is dangerous for everything else, because an incorrect, duplicate or disputed invoice that is ignored rather than rejected can slide into the credit base by default. Under the IMS, doing nothing is itself a decision, and not always the one the taxpayer would have chosen.
The October 2025 enhancements add both flexibility and discipline. Taxpayers can now accept a credit note while reversing only the input tax credit that genuinely needs reversing, instead of being forced into a full reversal; they can attach remarks when rejecting or pending a record, and those remarks are visible to the supplier, turning the IMS into a channel for reconciliation rather than a silent ledger. Rejected documents push the supplier toward correction through GSTR-1A or a later amendment, which then reappears in the recipient's IMS for fresh action.
The grey area is operational rather than doctrinal. For a business with thousands of monthly invoices, active management of every record is a resourcing question, and deemed acceptance quietly converts a staffing gap into a tax exposure. Credit notes demand particular care, because an accepted credit note carries a reversal that must be computed correctly, and a rejected one leaves the supplier's liability unsettled. The interface is new enough that process, not interpretation, is where most errors will be made in the first cycles.
The disciplined response is to treat the IMS as a monthly control, not a year-end reconciliation: fix responsibility for review, set internal cut-offs well before the GSTR-3B date, build a rule for handling credit notes and a protocol for rejections that keeps suppliers informed, and reconcile the IMS position against the books before anything is filed.
