GST input tax credit (ITC) is not automatic just because an invoice appears in your books or in GSTR-2B. A registered person may claim tax charged on goods or services used, or intended to be used, for business only after meeting the statutory conditions, retaining prescribed evidence, excluding blocked or non-business portions, observing the time limit and making any required reversals.
This guide explains the eligibility tests under the CGST framework, the records that support a defensible claim, the 180-day payment rule, the general 30 November deadline, and a document-level process for reconciling your books with GSTR-2B. State or Union Territory provisions, IGST rules, notifications and transaction-specific facts can change the result, so verify the current law and portal instructions before filing.
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What GST input tax credit means
ITC allows a registered person to set off eligible GST paid on inward supplies against output GST, subject to the Central Goods and Services Tax (CGST) Act, related rules and applicable IGST or state/UT provisions. Section 16(1) starts with two questions: are you a registered person, and were the goods or services used or intended for use in the course or furtherance of business? Even when both answers are yes, the conditions in section 16(2), the restrictions in section 17 and the document rules must still be satisfied. See the CBIC CGST Act.
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- The claimant is the correct registered person for the supply.
- The supply was actually received and has a business purpose.
- A prescribed tax document contains the required particulars.
- The supplier’s tax has been paid to the Government where the law requires it, and the recipient has furnished the relevant return.
- The credit is within the statutory time limit.
- No blocked-credit rule applies, and any non-business or exempt-use portion has been removed.
- Any payment-related reversal, duplicate claim or later re-availment has been recorded correctly.
For goods delivered in lots or instalments, section 16(2) links entitlement to receipt of the last lot or instalment. Do not treat a document date or a GSTR-2B entry as proof that every statutory condition has been met.
Eligibility tests to apply to every invoice
1. Confirm the claimant and the supply
Match the supplier document to the GSTIN that received the supply. Check the legal entity, registration status, place of supply and whether the expense belongs to that entity’s business. A document addressed to another GSTIN, an employee personally or an unrelated business cannot be claimed merely because your accounts team paid it.
2. Prove receipt and business use
Retain evidence that the goods arrived or the service was performed: a goods-received note, delivery record, service completion evidence, contract milestone, consumption record or other fact-specific proof. If an inward supply supports both business and private or other use, only the business portion can enter the credit calculation.
3. Hold a prescribed document
Depending on the transaction, the supporting document may be a supplier tax invoice, debit note, bill of entry for imported goods or a specified Input Service Distributor (ISD) document. The document must contain applicable particulars required by the law and rules. A purchase order, pro-forma invoice or payment advice by itself is not a substitute for the prescribed document. The document categories and particulars are set out in the CBIC ITC Rules.
4. Check tax payment and return conditions
Section 16(2) includes conditions concerning payment of tax to the Government, subject to the Act, and furnishing the recipient’s return. For reverse-charge supplies, separately verify the tax-payment and reporting steps that apply to the reverse-charge transaction; an ordinary supplier-upload match is not the whole test.
5. Test the deadline before filing
Apply the section 16(4) cut-off before carrying an old invoice into a current return. The general rule bars taking credit after 30 November following the end of the relevant financial year, or the date of furnishing the relevant annual return, whichever is earlier. The date belongs to the invoice or debit note’s financial year, not the month in which your bookkeeper discovers it.
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How the 30 November deadline works
For example, an invoice pertaining to financial year 2025–26 ordinarily cannot be claimed after 30 November 2026 if the relevant annual return has not already been furnished earlier. This is a general illustration of the statutory sequence, not a determination for a particular taxpayer.
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Business, exempt and blocked use: how to restrict credit
Non-business use
When an inward supply is partly for business and partly for another purpose, attribute only the business share. Keep a reasonable allocation method and the underlying usage evidence. An allocation made once and never revisited is difficult to defend when usage changes.
Taxable and exempt supplies
If an input supports both taxable (including zero-rated) and exempt supplies, apply the apportionment mechanism prescribed under section 17 and the rules. Maintain the calculation, turnover or other relevant inputs used, the period covered and the eventual adjustment. Do not assume that an expense used somewhere in a taxable business is wholly creditable if it also supports exempt activity.
Blocked credits under section 17(5)
Section 17(5) blocks specified categories, subject to the exceptions written into each clause. The Act includes examples involving specified motor vehicles and certain food, catering, club and insurance-related supplies. These are examples, not a universal “all vehicles” or “all insurance” rule: identify the exact clause, its exception and the facts of the purchase in the current CGST Act text.
| Question | Evidence or action | Result if unanswered |
|---|---|---|
| Is the supply for business? | Purpose note, contract, cost-centre and usage evidence | Remove non-business share |
| Does it support exempt output? | Taxable/exempt mapping and apportionment worksheet | Restrict the exempt-use portion |
| Is it a section 17(5) category? | Clause-by-clause review, including exceptions | Do not claim the blocked amount |
| Is the claim timely? | Invoice financial year, annual-return date and 30 November check | Hold or reject the late credit unless a specific relief applies |
Records to retain for an ITC claim
The ITC rules identify supplier tax invoices and debit notes, bills of entry for imported goods and specified ISD documents as supporting documents. The document should be readable, retrievable and linked to the accounting entry and return period. See the CBIC ITC Rules.
Account and record rules require a registered person to maintain records of tax payable, tax collected and paid, input tax and ITC claimed, along with registers of tax invoices, credit notes, debit notes and delivery challans. Records may be maintained electronically under the applicable rules. The CBIC Accounts and Records Rules set out the framework.
A practical claim file should connect the following items, while recognising that not every item is a separately prescribed document in every case:
- Original invoice, debit note, bill of entry or ISD document, including amendments and credit notes.
- Proof of receipt, such as delivery acknowledgement, inward register, service acceptance or import documentation.
- Purchase-book entry, payment reference and the GSTIN and tax amounts captured in your ledger.
- Business-purpose explanation and, where relevant, the non-business or exempt-use allocation.
- GSTR-2B line, supplier follow-up and resolution of any mismatch.
- Payment-age report showing whether the 180-day condition has been met.
- Return working papers showing credit claimed, reversed, carried forward or re-availed.
- Reviewer sign-off and a change history for corrections.
Retention period
Section 36 of the Act states a retention period tied to expiry of 72 months from the due date for furnishing the annual return for the relevant year, with longer retention in certain proceedings. Periods and exceptions can be amended and depend on the circumstances, so verify the current section 36 wording and any proceeding-related extension before destroying records.
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GSTR-2B is an auto-drafted, static and read-only ITC statement for a relevant period. The GST Portal says it is generated from supplier filings, including GSTR-1/1A and GSTR-5, ITC received through GSTR-6, and import information from ICEGATE for goods and specified SEZ supplies. Because it is static, later supplier amendments appear in the period in which the system reports them rather than continuously rewriting a past statement.
GSTR-2B is an important reconciliation input, not an eligibility certificate. The statement may not reflect every legal restriction, such as private use, blocked-credit clauses, apportionment, a time bar or the need for a payment-related reversal. The GST Portal expressly advises taxpayers to reconcile generated data with their own records and books of account. Read the GST Portal GSTR-2B FAQ.
Document-level GSTR-2B reconciliation workflow
- Freeze the source population. Export the purchase register, expense ledger, import register and credit-note register for the return period. Assign a unique internal key using supplier GSTIN, document number and document date.
- Match core fields. Compare GSTIN, document number, date, taxable value, each tax component and amendments or credit notes against the GSTR-2B line. Normalise spacing and numbering formats before treating a line as unmatched.
- Classify every difference. Mark it as timing, missing supplier upload, amendment, duplicate, wrong GSTIN or place-of-supply issue, import item requiring attention, or an internal recording error. Keep the explanation and the person responsible for resolution.
- Follow up with the supplier. Ask for a corrected filing or document where appropriate. Do not claim a missing line solely because the supplier promises to upload it; use the evidence and timing permitted by the law applicable to the claim.
- Apply the legal screen independently. Test receipt, business use, exempt-use apportionment, section 17(5), time limit, tax-payment conditions and the 180-day payment rule. A “matched” line can still fail this screen.
- Remove duplicate claims. Search prior-period working files and amendment lines so the same invoice is not claimed twice. Link a credit note to the original invoice and record its effect.
- Calculate reversals and re-availments. Post required reversals in the period prescribed, and re-avail only after the statutory condition that permits re-availment is satisfied. Keep the original claim and reversal linked.
- Reconcile to GSTR-3B. Tie the eligible net amount to the relevant GSTR-3B cells, including reverse-charge reporting where applicable, and have a reviewer sign the bridge from books to return.
- Archive the trail. Save the GSTR-2B download, matching file, exception log, supplier correspondence, calculations and final return acknowledgement in a retrievable location.
Useful reconciliation statuses
| Status | Typical meaning | Action before claim |
|---|---|---|
| Matched and eligible | Books and GSTR-2B agree and legal tests pass | Include in eligible ITC working |
| Matched, legally ineligible | Blocked, private, exempt-use or otherwise restricted | Exclude or apportion |
| Book-only | Supplier line missing or not yet reported | Investigate timing and filing; do not assume eligibility |
| 2B-only | Not recorded in your books or recorded under another key | Verify receipt, document and business purpose before recording |
| Exception | Amendment, duplicate, wrong GSTIN, import or credit-note issue | Resolve and preserve the explanation |
The 180-day supplier-payment rule
For non-reverse-charge inward supplies, the second proviso to section 16(2) and Rule 37 address failure to pay the supplier the value of the supply plus tax within 180 days from the invoice date. The corresponding credit is reversed or added to output tax liability with applicable interest under the rules. The unpaid proportion matters: a partial payment can require a proportionate treatment based on the applicable rule.
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This is not necessarily a permanent forfeiture. After paying the supplier, the recipient may re-avail the credit subject to the statutory conditions and the period in which re-availment is allowed. Maintain an ageing report, payment proof, reversal entry and later re-availment reference. Do not apply this supplier-payment workflow mechanically to reverse-charge transactions, which have their own tax-payment mechanics.
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Common failure modes and fixes
“It is in GSTR-2B, so I claimed it.”
Fix: run the independent eligibility screen. GSTR-2B does not know whether an employee used an asset privately, whether a section 17(5) exception applies, or whether you crossed the time limit.
“The invoice is in the purchase register, so the supplier must have filed it.”
Fix: compare document-level fields with the static statement and record supplier follow-up. A book entry cannot replace a missing statutory document or an unverified receipt.
“The entire mixed-use expense was credited.”
Fix: document the business share and the taxable/exempt allocation, then post the prescribed restriction or reversal.
“A late invoice can be carried indefinitely.”
Fix: run the 30 November or annual-return-earlier test when the invoice is first identified, and check whether the narrowly defined retrospective relief in Circular 237/31/2024-GST applies.
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“We paid late, so the credit is gone forever.”
Fix: reverse or add the affected amount with applicable interest as required, track payment and re-avail the credit only when the law permits.
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A monthly control checklist
- Close the purchase and import registers before downloading the period’s GSTR-2B.
- Match supplier GSTIN, document number/date, taxable value and tax components.
- Review amendments, debit notes, credit notes and prior-period claims.
- Separate reverse-charge and import items for their specific checks.
- Run business-use, exempt-use and section 17(5) tests.
- Review invoices approaching the 30 November or annual-return deadline.
- Age unpaid supplier balances and identify 180-day reversals.
- Reconcile eligible net ITC to GSTR-3B and obtain review approval.
- Save the statement, working file and exception evidence under the retention policy.
What to verify before filing
The CGST framework is the baseline, but the answer for a particular transaction can also depend on IGST provisions, corresponding state or UT law, notifications, circulars, the nature of the supply and the return period. Official pages and portal behaviour can change. Before filing or taking an old credit, check the current consolidated Act, rules, relevant circulars and GST Portal instructions, and obtain transaction-specific professional advice where the facts are disputed or material.
Frequently Asked Questions
Does a GSTR-2B entry by itself prove that ITC is claimable?
No. It is a static, read-only statement used for reconciliation. You must still verify receipt, business use, prescribed documents, blocked-credit and apportionment rules, deadlines, payment-related reversals and other statutory conditions.
What is the usual last date for claiming an old GST invoice?
The general section 16(4) rule is 30 November following the relevant financial year or the date of furnishing the relevant annual return, whichever is earlier. Limited retrospective relief discussed in CBIC Circular 237/31/2024-GST applies only to specified cases.
How long should GST ITC records be kept?
Section 36 ties the general period to 72 months from the due date for the relevant annual return, with possible longer retention in proceedings. Confirm the current wording and any applicable extension before disposal.
The Bottom Line
Claim GST ITC only after the legal eligibility tests, documentary checks and GSTR-2B reconciliation agree. Keep a traceable file from invoice and receipt through apportionment, payment, reversal and GSTR-3B reporting; that process is stronger evidence than a portal match alone.
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