The most common reconciliation error is not a wrong formula. It is reading “Matched” as “eligible”. An invoice that agrees line for line between your purchase register and GSTR-2B has cleared one legal condition. Whether you may claim the credit in this month’s GSTR-3B depends on the others as well, and none of them is visible in the two files you are comparing.
This page is one part of our GSTR-2B reconciliation guide, which shows how the whole process fits together.
This guide lists the conditions we have checked against official text, says what a reconciliation can and cannot prove for each, and ends with a six-invoice example you can copy for your own working paper.
Four conditions reconciliation touches
| Condition | Where it comes from | What reconciliation shows | What only you can check |
|---|---|---|---|
| Supplier reported the invoice and it is in your GSTR-2B | Section 16(2)(aa), CGST Act; Rule 36(4), CGST Rules | Directly: the invoice is in 2B or it is not | Whether an IMS action of yours (such as Pending) is the reason it is missing |
| You received the goods or services | Section 16(2)(b), CGST Act | Nothing | Goods receipt note, delivery challan, service completion record |
| Claimed within the time limit | Section 16(4), CGST Act | Invoice date against the financial-year cut-off | Whether you have already filed the annual return, which can move the cut-off earlier |
| You paid the supplier within 180 days (not for reverse charge) | Rule 37, CGST Rules | Nothing | Payment ageing from your ledger, by invoice date |
Condition 1: the invoice is in your GSTR-2B
Since 1 January 2022, Section 16(2)(aa) allows ITC only if the invoice details were furnished by the supplier in the statement of outward supplies and communicated to you. Rule 36(4) says the same thing from the recipient’s side: no ITC on such invoices unless they were furnished by the supplier in GSTR-1 (or through the invoice furnishing facility) and communicated to you in GSTR-2B. Before that date there was a provisional buffer, at the end 5% of the eligible credit shown by suppliers; it no longer exists, so there is no allowance for “the supplier will file later”.
Timing matters for this condition. The supplier’s monthly GSTR-1 is due on the 11th, your GSTR-2B is generated on the 14th, and your GSTR-3B is due on the 20th (for quarterly QRMP filers the GSTR-3B dates are the 22nd or 24th, depending on the state). So the credit you can claim in a month is set by what suppliers had reported when your GSTR-2B was generated on the 14th, not by what they promise on the 15th.
IMS adds a second way for an invoice to be absent. Invoices you keep Pending in the Invoice Management System (IMS) do not become part of GSTR-2B or GSTR-3B. If you later change the action, you can recompute GSTR-2B before filing GSTR-3B and take the credit. That means an invoice missing from 2B may be the supplier’s omission or your own Pending action, and the fix is different for each. Our IMS accept, reject, pending decision tree and the guide on invoices stuck in IMS Pending walk through it.
Claiming beyond 2B has a price. When ITC claimed in GSTR-3B exceeds the ITC available in GSTR-2B by more than a pre-defined limit, you receive an intimation in Form DRC-01C and must file Part B to explain or reconcile the difference. If ITC is wrongly availed and utilised, interest under Section 50(3) is charged at 18% a year. See how to reply to a DRC-01C notice.
Condition 2: you received the goods or services
Section 16(2)(b) is one line: the recipient must have received the goods or services or both. GSTR-2B cannot tell you this, because the supplier reports what it billed, not what arrived at your gate. An invoice can be in 2B with the truck still on the road, or the service not yet completed.
In practice this condition is proved by your own records, so build the habit of checking them at reconciliation time rather than at notice time:
- For goods, match the invoice to a goods receipt note or gate entry dated on or before the day you claim.
- For services, keep a completion or acceptance record; an email confirming what was delivered and when is better than nothing.
- For invoices booked in advance (proforma-style entries, bills booked on dispatch), mark them in your register so they do not slip into the claim by default.
If an invoice is already in your GSTR-2B but the goods have not arrived, do not take the credit in that month’s GSTR-3B. Nothing in Section 16(2)(b) or Section 16(4), as described above, stops you claiming it in the month the goods arrive, as long as the Section 16(4) date has not passed. For an invoice that has not yet reached 2B, the IMS Pending action is the mechanism for holding it back; the decision tree shows when to use it.
Condition 3: the time limit in Section 16(4)
ITC on an invoice or debit note cannot be taken after 30 November following the end of the financial year to which it pertains, or the furnishing of the relevant annual return, whichever is earlier. For an invoice of financial year 2025-26 that means 30 November 2026, unless you file the annual return before that date, in which case the earlier date governs.
This is the one condition where reconciliation gives you a partial answer: sort your open items (missing from 2B, IMS Pending, goods received late) by invoice date, and anything from the previous financial year goes to the top of the list. The full playbook, with the year-end sweep, is in the post on the Section 16(4) time limit.
Condition 4: payment to the supplier within 180 days
Rule 37 applies to a person who has availed ITC on an inward supply, other than a supply on which tax is payable on reverse charge, and has not paid the supplier the value plus tax within 180 days from the date of the invoice. That person has to pay back an amount equal to the ITC availed, along with interest. If you later pay the supplier, you can re-avail the credit.
Nothing in GSTR-2B or your purchase register shows this, because it lives in your payables ledger. The check is an ageing report of unpaid supplier bills against invoice date, run every month, with anything approaching 180 days flagged before the deadline. For suppliers who are late in filing, payment terms and payment holds interact with this rule; the vendor payment hold SOP covers the commercial side.
Not covered here. Section 16(2) has further conditions than the ones above, and some credits are restricted or blocked for reasons that have nothing to do with reconciliation, such as the nature of the goods or services. We have not repeated those here because this guide only states what we have checked against the official text. Read Section 16 in full and ask your CA about any invoice where eligibility itself is doubtful.
Worked example: five invoices and one reversal
A trading firm reconciles its August 2026 purchases. GSTR-2B was generated on 14 September 2026 and GSTR-3B is due on 20 September 2026. Amounts below are the ITC (tax) figures.
| Invoice | ITC in books | ITC in 2B | Other checks | Claim in this GSTR-3B |
|---|---|---|---|---|
| INV-2201 | ₹36,000 | ₹36,000 | Goods received, paid | ₹36,000 |
| INV-2202 | ₹18,900 | Nil | Supplier has not reported it | ₹0 (chase supplier) |
| INV-2203 | ₹27,000 | ₹27,000 | Goods still in transit | ₹0 for now |
| INV-2204 | ₹12,150 | ₹12,600 | Invoice in hand shows ₹12,150 | ₹12,150 |
| INV-2205 | ₹9,000 | ₹9,000 | Dated Feb 2026 (FY 2025-26); limit is 30 Nov 2026 | ₹9,000 |
| Total to claim | ₹57,150 |
The total is ₹36,000 + ₹12,150 + ₹9,000 = ₹57,150. What happened row by row:
- INV-2202 fails Condition 1. Nothing to claim until the supplier reports it and it appears in a GSTR-2B. Follow the steps in what to do when a supplier has not filed GSTR-1.
- INV-2203 passes Condition 1 and fails Condition 2. The ₹27,000 is not lost; it can be claimed in the month the goods arrive, as long as the Section 16(4) date has not passed.
- INV-2204 is in 2B for ₹450 more than the invoice supports. Claim the lower figure, never above 2B, and ask the supplier to correct the reported value. GSTR-1A lets a supplier amend a current-period record after filing GSTR-1 and before filing GSTR-3B, but do not wait for the correction before filing.
- INV-2205 is an old invoice that reached 2B late. It is claimable now, and it shows why year-old open items matter: this one has under three months left.
Separately, the payables ageing throws up INV-1874, dated 12 March 2026, on which ITC of ₹54,000 was claimed in an earlier return. It is still unpaid and is 186 days old on 14 September 2026. That is past 180 days from the invoice date, so Rule 37 applies to the credit availed on it. Which return carries the reversal and the amount of interest are outside what we have verified; confirm both with your CA.
A pre-claim checklist for the 14th to the 20th
- Reconcile the purchase register against the new GSTR-2B. Every invoice in 2B but not yet in books, or the reverse, gets a reason. The day-by-day timeline shows how to spread this over the week.
- Check IMS for anything you left Pending. Decide accept or reject, then recompute GSTR-2B.
- Tick receipt for every matched invoice above a value you set, and for all bills booked on dispatch.
- Sort by invoice date and put prior-year items at the top of the follow-up list.
- Run the payables ageing and list anything past 150 days as an early warning for Rule 37.
- Set the claim in GSTR-3B Table 4(A)(5), “All other ITC”, so that it does not exceed the 2B figure for the eligible invoices.
Common mistake: treating the ITC total on the 2B summary as the amount to claim. That total is what suppliers reported. It has not been through Condition 2, 3 or 4, and it may contain invoices you have not received or have not paid for.
See which invoices are missing from your GSTR-2B
The tool compares your purchase register with GSTR-2B and puts each invoice in a bucket: matched, value mismatch, in books but missing from 2B, in 2B but not in books, or IMS Pending, with the rupee figure for each. It cannot tell you whether goods were received or suppliers paid; those checks stay with you. Your GSTR-2B and purchase register files are read in your browser and never uploaded to any server.
Related guides
- GSTR-2B reconciliation guide: the complete guide to ITC matching
- input tax credit meaning: conditions and how GSTR-2B decides it
- How accountants can automate GSTR-2B reconciliation
- GSTR-1 vs GSTR-2B mismatch: causes, investigation and fixes
- GSTR-2B vendor wise reconciliation guide
- GSTR-2B reconciliation for large businesses
Last checked: 30 September 2026. Sources: Notification 39/2021-Central Tax (Section 16(2)(aa)), Notification 40/2021-Central Tax (Rule 36(4)), CGST Act, Section 16, CBIC Circular 237/31/2024-GST (Section 16(4)), Notification 19/2022-Central Tax (Rule 37), GSTN IMS FAQ, GSTN advisory on DRC-01C, GSTN GSTR-3B user guide, Notification 13/2017-Central Tax (interest rate).