IMS and the End of Provisional ITC: How GST Credit Is Decided Now

Credit used to be something you calculated

For most of GST’s life, input tax credit was arithmetic. You added up the GST on your purchase invoices, you claimed it, and if something did not match you sorted it out later. There was a cushion — a percentage of unmatched credit you could take provisionally — and the cushion absorbed the ordinary friction of suppliers filing late.

That cushion is gone. Credit is now restricted to what appears in your GSTR-2B, and what appears in your GSTR-2B is decided by what you did, or did not do, in the Invoice Management System.

Which turns input tax credit from an arithmetic exercise into an operational one. Somebody has to open the dashboard. Every month. Before the 14th.

Almost everything written about IMS is written for enterprise finance teams with a reconciliation function and an ERP. This is written for the business with forty staff and one person who does the GST.

What IMS is, in one paragraph

When your supplier saves or files a document in GSTR-1, IFF or GSTR-1A, that document appears on your IMS dashboard on the GST portal. You take a view on each one. Your GSTR-2B is then generated from the accepted and deemed-accepted records. It is a communication channel between supplier and recipient that the statute has made consequential.

The four outcomes, and what each one does

That default was designed for convenience, and for a business whose supplier data is clean it works fine. For a business with a long tail of small suppliers it means the portal is making your credit decisions for you.

When to use each one

• Accept — the invoice is yours, the goods or services arrived, the value and tax match your records, and the credit is eligible. This is the overwhelming majority of records and should be quick.
• Reject — the invoice is not yours at all, the GSTIN is wrong, it is a duplicate, or it is a credit note you genuinely dispute. Rejection is a statement that the document does not belong in your account.
• Pending — you have the invoice but you are not ready to claim. Goods in transit at the month end, an invoice under dispute, a service not yet performed, or a document you simply have not verified. This is the honest answer far more often than people use it.
• No action — should never be a choice. If it happens, it should be because the record was fine and you accepted it, not because nobody opened the dashboard.

Pending is the underused option

Small businesses tend to treat IMS as a binary — accept or reject — and end up accepting things they should have held.

The classic case is goods in transit. Your supplier invoices on 29 March, the material arrives on 4 April. Credit is not available until you have received the goods, so accepting that invoice into the March 2B and claiming it is a claim you are not entitled to yet. Pending is exactly the right answer, and the record comes back for you in April.

The same applies to a disputed invoice, a partial delivery, or anything you have not had time to verify. Pending is not an admission of disorganisation; it is the correct treatment for a document that is not yet claimable.

Rejecting a credit note is a commercial act

One action in IMS reaches out of your account and into somebody else’s, and it is worth being deliberate about.

When a supplier issues a credit note, they are reducing their output liability and you are expected to reverse the corresponding credit. If you reject that credit note, the reduction does not hold and the liability goes back to the supplier.

From your side that may be entirely correct — you never agreed the return, the quantity is wrong, the credit note relates to a different order. But from the supplier’s side it lands as an unexplained increase in their GST liability, and the first they know of it is when their own return does not balance.

So the sequence is: call the supplier, agree the position, then act in IMS. Rejecting first and explaining afterwards turns a reconciliation difference into an argument, usually with somebody who is also a customer.

The dates that govern the month

Two mechanics worth knowing. If you act in IMS after the 2B has been generated, you must trigger a recompute of GSTR-2B for the change to take effect — the recomputation is not automatic. And GSTR-2B for a period is not generated until the GSTR-3B for the previous period has been filed, so a business that has fallen behind on 3B stops receiving 2Bs and compounds its own problem.

Taxpayers on the QRMP scheme receive GSTR-2B quarterly rather than monthly, but records still land on the IMS dashboard as suppliers file, so the review work is still monthly even where the return is not.

A monthly routine that fits a small business

Half a day a month, done in the same order every time.

• Day 12 to 13 — open IMS and export the full list. Do not work in the browser; work in a sheet against your purchase register — which means the bookkeeping has to be current by the 12th, not by the 20th.
• Match on GSTIN, invoice number, date, taxable value and tax. Most records will match cleanly and can be accepted in bulk.
• For each unmatched record, decide which of three buckets it is in: it is ours and correct but late in our books, it is ours but not yet claimable, or it is not ours.
• Accept the first bucket, mark the second Pending, reject the third.
• For any invoice in your books that is not on the IMS dashboard at all, the supplier has not filed. Chase them now, before the 13th, not after the 2B has been generated. Groups that distribute common credit should also check their Input Service Distributor position, which now interacts with this.
• Day 14 — check the generated 2B against the position you intended. Investigate any difference before it becomes a 3B problem.
• Day 15 to 19 — finalise the 3B working, then file.
• Keep the exported dashboard, your matching sheet and your notes on the rejections. This is the file you will want if a mismatch notice arrives eighteen months from now. If you would rather not own the routine at all, a virtual accountant can run it as part of the monthly close.

If half a day a month is not available — and for most owner-managed businesses it is not — this is precisely the work that belongs with monthly bookkeeping or managed GST return filing. The cost of getting it wrong is not the fee; it is the credit.

The supplier problem, and how to manage it without enterprise tooling

Under the current design your credit depends on your supplier’s filing discipline. That is a commercial exposure, not just a compliance one, and small businesses can manage it with a spreadsheet.

• Keep a simple score per supplier: how many of their invoices appeared in IMS before the 13th, each month, for the last six months.
• Suppliers who are consistently late are a cash-flow cost to you. Say so, in those terms, at the next commercial conversation.
• For new suppliers, check GST filing status on the portal before the first significant order. It takes a minute and it is public.
• Put a payment term in the purchase order that ties the final release to the invoice appearing in your 2B. This is common practice and it works.
• Do not let the same supplier be a problem for six months running without escalating it. The credit you lose does not come back.

The deadline behind all of this

Credit for a financial year cannot be claimed indefinitely. The outer limit is 30 November following the end of the financial year, or the date of filing the annual return, whichever is earlier.

So an invoice you left Pending in June 2026 and never came back to is claimable until 30 November 2027, and then it is not. Anything sitting in Pending needs a review before that date, every year, without fail. A Pending pile that nobody sweeps is just a slower way of losing the credit.

Credit blocked by a supplier’s error is also a refund question in some situations, and worth raising before the year closes. There is a second outer limit worth knowing: GST returns can no longer be filed after three years from their due date. A business that has stopped filing does not get to catch up forever.

Key takeaways

• No action equals acceptance. Ignoring the dashboard is claiming the credit, not deferring it.
• Provisional credit is gone. If it is not in your 2B, you cannot claim it.
• 2B is generated on the 14th; act before then, and recompute if you act after.
• Pending is the correct answer for goods in transit and unverified invoices, and it is badly underused.
• Rejecting a credit note moves liability back to your supplier — agree it on the phone first.
• Credit for a financial year dies on 30 November following that year, or on the annual return date if earlier.

Frequently asked questions