Before October 2024, GSTR-2B was something that happened to you. Your suppliers filed, the portal assembled a statement on the 14th, and your only options were to claim what it showed or explain later why you had not.
The Invoice Management System changed that. Since it went live on 14 October 2024, every inward document reported by your suppliers lands on an IMS dashboard first, and you act on it before GSTR-2B is generated. Your GSTR-2B is now built from your decisions rather than delivered to you.
That is a genuine improvement. It also creates a new way to lose money, because on IMS doing nothing is a decision, and it is not always the safe one.
The three actions
Every document arriving on the dashboard can be Accepted, Rejected, or kept Pending. There is no fourth option, and no action at all is treated as acceptance.
Accept. The document flows into your GSTR-2B and the credit is available. This is the right action for the overwhelming majority of documents, and if the invoice is correct there is nothing to think about.
Reject. The document does not flow into your GSTR-2B and no credit arises from it. Reject is for documents that should not be there at all. An invoice raised on your GSTIN by mistake, when it belongs to another entity. A duplicate. A supply you never received. A credit note issued in error which would wrongly reduce your credit.
Pending. The document is held. It does not enter this period’s GSTR-2B, and it stays on the dashboard for a later period, where you can accept it then.
Where the money is lost
The distinction that costs people money is between Reject and Pending, and it is the opposite of what the words suggest.
Reject is not “not now”. Reject is “never”. A rejected document is removed from your credit for good, and rejecting an invoice that was in fact valid means writing off the credit on it.
Pending is the right action for anything unresolved. Goods not yet received. An invoice under dispute on quality or quantity. A rate that looks wrong and needs checking. Documentation awaited. In every one of these cases the document may well turn out to be perfectly claimable, and Pending preserves that possibility while keeping the credit out of the current period.
If you are not certain, mark it Pending. Rejecting to tidy up a dashboard is how valid credit is destroyed, and it is not reversible by re-accepting later.
The second, quieter loss is inaction. No action means the document is treated as accepted and enters your GSTR-2B. If it was an invoice you should have rejected, you have now claimed credit you were not entitled to, and the fact that you never looked at the dashboard is not a defence.
What the supplier sees
The supplier gets a view of what recipients have done with his documents, and this is a bigger change to commercial behaviour than the credit mechanics.
A rejection is visible to the supplier. Where it is genuine, this is exactly right: the supplier finds out promptly that he raised an invoice on the wrong GSTIN and can correct it in the same cycle, instead of discovering it during the annual reconciliation.
Where the rejection is careless, it produces an argument. A supplier who has correctly supplied and correctly invoiced, and sees his invoice rejected, will call. Answering that call costs more time than reading the invoice properly would have.
This cuts the other way too. If you are the supplier, the supplier view is now a genuine control. Rejections appearing against your invoices are an early signal of a wrong GSTIN in your customer master, a duplicate in your billing run, or a customer disputing a supply. Checking it monthly is worth the ten minutes.
What IMS does not do
It is easy to over-read IMS, so the limits are worth stating.
It does not decide eligibility. Accepting a document confirms that the document is genuine and belongs to you. It says nothing about whether Section 17(5) blocks the credit, whether the place of supply lets you use it, or whether Rule 42 requires part of it to be reversed. Accepting a hotel invoice with a place of supply in another state puts it in your 2B, and the credit is still unusable.
It does not tell you whether the supplier paid. IMS is fed by GSTR-1. Rule 37A is about GSTR-3B. A supplier who files GSTR-1 faithfully and never files GSTR-3B produces a clean IMS dashboard and a Rule 37A exposure at the same time.
It does not replace reconciliation against your books. IMS shows you what suppliers reported. It cannot show you an invoice that is in your purchase register and in nobody’s GSTR-1, which is the single most valuable exception in any reconciliation, because that is the invoice on which you may be about to claim credit that does not exist. That gap only appears when you compare 2B against your own records.
So IMS is a triage layer sitting in front of reconciliation. It is not reconciliation.
Running it without it running you
Do it through the month, not on the 13th. Documents arrive continuously as suppliers file. Leaving the whole dashboard to the day before 2B is generated means either rushing it or defaulting to acceptance by inaction. Twenty minutes a week beats three hours in a panic.
Accept the ordinary majority in bulk, and spend your attention on the rest. Most documents match a purchase order and a goods receipt and need no thought. The value is in the residue.
Write down what Pending means in your organisation. Pending is only useful if somebody revisits it. Without an owner and a review date it becomes a place where credit ages quietly until Section 16(4) closes the window on 30 November. A monthly ageing of the pending queue is the control that makes Pending safe.
Never reject to reduce a count. The only reason to reject is that the document should not exist for you.
Reconcile after 2B is generated anyway. IMS improves the quality of what goes into 2B. It does not tell you what is missing from it.
The summary
IMS gives you control of your own GSTR-2B, which is a real improvement over having it assembled without you. The cost of that control is that inaction now has consequences. Accept what is right, reject only what should not exist, use Pending for everything unresolved and give the pending queue an owner, and keep doing a proper reconciliation against your books afterwards. The dashboard tells you what your suppliers said. Only your books can tell you what they left out.
