It is the 15th. The reconciliation shows an invoice you booked, received goods against, and possibly already paid for, and it is not in GSTR-2B. The law is unambiguous about what that means for this month: ITC is available only on invoices the supplier furnished in GSTR-1 and that were communicated to you in GSTR-2B (Section 16(2)(aa), and Rule 36(4) from 1 January 2022). What the law does not tell you is why the invoice is absent, and that is the part that decides how fast you can recover the credit.
For the other causes of a GSTR-2B mismatch and how to fix each one, see our guide to common reconciliation errors.
Step 1: confirm it is really missing
Many “missing” invoices are present in 2B under a slightly different identity. Run three quick checks before you blame anyone.
- Search 2B by supplier GSTIN and amount, not by invoice number. If you find the amount with a different number, it is a format difference; see why invoice numbers fail to match.
- Search by invoice amount across all suppliers. A mistyped GSTIN in your register sends the invoice to the wrong supplier and leaves an unexplained line under the right one.
- Check the other sections of the file. The Excel download contains B2B, B2BA, CDNR and CDNRA tables. An invoice that the supplier amended can sit in B2BA, and a document you booked as an invoice can be a debit note in CDNR.
Only when all three come back empty is the invoice truly absent from the statement.
Step 2: identify the cause
| Cause | How to tell | What to do | Claim this month? |
|---|---|---|---|
| 1. You kept the record Pending in IMS | The record shows on your IMS dashboard with action Pending | If goods are received and the invoice is correct, Accept and recompute GSTR-2B before filing GSTR-3B; see invoices stuck in IMS Pending | Yes, after recompute |
| 2. Your books are wrong | Same supplier and amount is in 2B under another number or GSTIN | Correct the register from the invoice copy and re-run the match | Yes, it is already in 2B |
| 3. Supplier has not filed GSTR-1 | Nothing at all from that GSTIN for the month; check the supplier’s filing status | Written follow-up, payment hold where your terms allow it | No |
| 4. Supplier filed but left this invoice out, or reported it wrongly | Supplier’s other invoices are in 2B; this one is not, or is there with a wrong GSTIN or number | Ask the supplier to add or correct it (GSTR-1A while their GSTR-3B is pending, or an amendment later) | No |
| 5. Supplier filed late, or files quarterly | Supplier says it is filed, but after your 2B was generated on the 14th, or the supplier is a quarterly filer whose return is not due yet | Get the filing date in writing; check each new GSTR-2B | No; when it appears in a GSTR-2B |
What each timing rule means for causes 3 and 5
A monthly filer’s GSTR-1 is due on the 11th of the next month. A quarterly filer’s GSTR-1 is due on the 13th of the month after the quarter. Your GSTR-2B is generated on the 14th. So a supplier who files after the 14th has missed your statement for that month, even if by only a day or two, and a quarterly filer has no GSTR-1 due at all until the month after the quarter ends. Ask which return the supplier is on, and when the invoice will be reported, before you send anything sharp. We have not verified how the invoices of a quarterly filer’s first two months reach a recipient’s GSTR-2B, so check the current GSTN advisory for quarterly filers if the supplier is one.
What GSTR-1A can and cannot do for you
GSTR-1A lets a supplier amend or add current-period records after filing GSTR-1 and before filing GSTR-3B. That is why the supplier message below asks for it explicitly and asks for it early: once the supplier has filed their GSTR-3B for the period, that route is closed. We have not verified exactly how a GSTR-1A record reaches a recipient’s already-generated GSTR-2B, so do not plan the 20th around it. If it does not show up when you recompute, carry the invoice forward and check each new statement. The guide to amended invoices and GSTR-1A covers the amendment side.
Do not claim it on the promise that the supplier will file. If you claim ITC in GSTR-3B beyond what GSTR-2B shows and the gap crosses the pre-defined limit, you receive a Form DRC-01C intimation and must file Part B. Interest at 18% a year applies if ITC is wrongly availed and utilised. The 5% provisional buffer that once allowed this was removed from 1 January 2022. See how to reply to DRC-01C.
Step 3: write to the supplier once, with everything in it
Send one message per supplier covering all their missing invoices, with the number, date, taxable value and tax for each, and the return you expect it to appear in. Suppliers act faster on a specific list than on “please check your filing”. Here is a message you can copy:
Note the last paragraph. It states a fact about your own claim, not a threat: you cannot claim the credit until the invoice is in your GSTR-2B. That keeps the conversation about a return, not about payment terms. If the supplier is a repeat offender, the commercial tools are in the payment hold SOP, and the escalation ladder is in what to do when a supplier has not filed GSTR-1.
Worked example: five missing invoices, three of them not really missing
A hardware distributor’s August 2026 books carry ITC of ₹4,80,000 and output tax of ₹5,20,000. After matching, five invoices worth ₹1,17,000 of ITC have no match in GSTR-2B; everything else (₹3,63,000 of ITC) matched. Triage on the 15th of September:
| # | Invoice | ITC | Cause found | Claim this month? |
|---|---|---|---|---|
| 1 | Fasteners supplier, INV 4471 | ₹28,800 | Left Pending in IMS | Yes, after Accept and recompute |
| 2 | Packaging supplier, BR/0312 | ₹41,400 | Supplier has not filed GSTR-1 | No |
| 3 | Tools supplier, 2026/778 | ₹14,850 | In 2B as 778; books had 2026/778 | Yes, already in 2B |
| 4 | Paint supplier, PT-2291 | ₹9,900 | GSTIN mistyped in books | Yes, already in 2B |
| 5 | Cable supplier, CB-118 | ₹22,050 | Supplier files quarterly; return not yet due | No; when it appears in a GSTR-2B |
| Total | ₹1,17,000 |
Claimable now from these five: ₹28,800 + ₹14,850 + ₹9,900 = ₹53,550. Waiting on suppliers: ₹41,400 + ₹22,050 = ₹63,450. Check: ₹53,550 + ₹63,450 = ₹1,17,000.
Now the cash effect on the 20th. If the accountant had treated all five as missing, ITC claimed would be ₹3,63,000 and cash payable ₹5,20,000 − ₹3,63,000 = ₹1,57,000. After triage, ITC claimed is ₹3,63,000 + ₹53,550 = ₹4,16,550, and cash payable is ₹5,20,000 − ₹4,16,550 = ₹1,03,450. The triage kept ₹53,550 in the bank for a month, and only two suppliers needed a message.
The wait-listed ₹63,450 goes on a carry-forward sheet. It is not written off: the credit can still be claimed once it appears in a GSTR-2B, as long as the Section 16(4) limit is open, that is, before 30 November following the end of the invoice’s financial year or the annual return date, whichever is earlier. The full mechanics are in the post on the Section 16(4) time limit.
Two traps while you wait
Holding payment does not stop the 180-day clock. Under Rule 37, if you have availed ITC on a supply (other than one on reverse charge) and have not paid the supplier the value plus tax within 180 days from the invoice date, the ITC has to be paid back with interest, and it can be re-availed once you pay. A payment hold is a cash-flow tool; put a reminder on the invoice date, not on the day the supplier files.
If you already paid the supplier, keep the bank proof with the invoice and your follow-up emails. They do not create an entitlement to ITC without the 2B entry, but they show the timeline if the same invoice is queried later.
Get the missing-invoice list in minutes
The tool separates invoices that are in your books but missing from GSTR-2B, invoices that are only in GSTR-2B, and IMS Pending, so that you can see the false gaps (causes 1 and 2) before contacting anyone. It cannot read your live IMS dashboard or the supplier’s filing status, so those two checks stay manual. Your GSTR-2B and purchase register files are read in your browser and never uploaded to any server.
Related guides
- GSTR-2B mismatch: common reconciliation errors and how to fix each one
- how to find GSTR-2B mismatches: finding them in three passes: totals, supplier, invoice
- duplicate invoice in GSTR-2B: spotting and fixing duplicates
Last checked: 30 September 2026. Sources: Notification 39/2021-Central Tax (Section 16(2)(aa)), Notification 40/2021-Central Tax (Rule 36(4)), CBIC Circular 237/31/2024-GST (Section 16(4)), Notification 19/2022-Central Tax (Rule 37), GSTN GSTR-1 user guide, GSTN GSTR-3B user guide, GSTN IMS FAQ, GSTN GSTR-1A FAQ, GSTN advisory on DRC-01C, GSTN FAQ on 2B tables, Notification 13/2017-Central Tax (interest rate).