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To claim input tax credit (ITC), do more than check that a GST invoice exists. Verify the prescribed document and invoice particulars, match the supplier’s report in GSTR-2B, prove that you received the goods or services, confirm business and taxable use, test blocked-credit and payment rules, observe the statutory deadline, and report only the supported amount in GSTR-3B. GSTR-2B helps reconciliation but is not legal approval of every amount shown.
What makes a GST purchase eligible for ITC?
Section 16(1) of the Central Goods and Services Tax (CGST) Act states:
“Every registered person shall, subject to such conditions and restrictions as may be prescribed and in the manner specified in section 49, be entitled to take credit of input tax charged on any supply of goods or services or both to him which are used or intended to be used in the course or furtherance of his business.”
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That entitlement is conditional. An invoice is evidence of a purchase and tax charge, not proof that every legal condition has been met. Review each document against all of these separate tests:
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| Eligibility axis | What you must establish |
|---|---|
| Document integrity | The document is one of the documents permitted for ITC, contains the required particulars, and identifies the correct supplier, recipient, tax and place of supply. |
| Supplier reporting | The supplier has furnished the relevant details and they have been communicated through the prescribed system; reconcile them with your GSTR-2B. |
| Receipt | You actually received the goods or services. For goods delivered in lots or instalments, receipt of the final lot is relevant. |
| Business and supply use | The purchase is used or intended for business and is attributable to taxable or zero-rated supplies where required. Apportionment may be necessary. |
| Specific restriction | No blocked-credit rule, non-business allocation, exempt-supply allocation, depreciation exclusion or other statutory restriction disqualifies the amount. |
| Payment and timing | The supplier-payment condition and the section 16(4) time limit are satisfied. |
| Return and reconciliation | The eligible amount is claimed in the applicable return, normally GSTR-3B, without duplication and with required reversals recorded. |
Step 1: Identify the document you are verifying
Domestic purchases
For an ordinary domestic purchase, start with the supplier’s tax invoice. A debit note can also support ITC where it is validly issued and relates to the underlying supply. Rule 36 of the CGST Rules specifies the documents on which credit may be availed; do not substitute an informal quotation, pro-forma invoice or payment receipt for a prescribed document.
Other transaction types
Imports, input-service-distributor credits and other prescribed situations can require different documents or workflows. Use the document specified for that transaction under Rule 36 and the applicable provisions rather than forcing every purchase into the domestic tax-invoice process. Keep the customs or distribution documentation together with the accounting entry when it applies.
Check the document’s status before calculating credit
- Confirm that the document is final, not a draft or pro-forma document.
- Determine whether it is an original invoice, a debit note or another prescribed document.
- Check whether a credit note, amendment or cancellation changes the amount you intend to claim.
- Make sure the document belongs to your registered entity and not to another group company, branch or personal purchaser.
Step 2: Check every required invoice particular
Rule 46 sets the tax-invoice particulars. Compare the document with the purchase order, delivery record and accounting entry rather than relying on a visual glance. At minimum, verify the following:
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|---|---|---|
| Supplier name, address and GSTIN | Match the legal supplier identity to the GST registration and your vendor master. | An incorrect supplier identity can make the document unreliable and cause a portal mismatch. |
| Invoice number and date | Record the exact number and date; compare them with the supplier’s report and your books. | These fields identify the document and determine timing tests. |
| Recipient details and GSTIN | For a registered recipient, ensure your legal name and GSTIN are correct. | A bill addressed to the wrong entity may not support your entity’s claim without correction. |
| Description of goods or services | Check that the description corresponds to what was ordered and received. | It supports the receipt and business-use tests. |
| Taxable value and tax amount | Recalculate or cross-check the taxable value, tax rate and tax charged against the transaction. | The claim cannot exceed the tax actually and validly charged. |
| Place of supply | For an inter-State supply, verify the relevant place-of-supply details and the tax type. | Incorrect tax treatment can require supplier correction before credit is taken. |
| QR code or IRN, where applicable | Check the applicable e-invoice requirement for the supplier and transaction; verify the QR/IRN when that regime applies. | Not every invoice has identical QR or IRN treatment, so apply the rule that covers that supplier and supply. |
Do not assume that a technically complete-looking PDF is valid merely because it contains a logo, stamp or payment reference. The legal particulars and the underlying transaction must agree.
Step 3: Match the invoice to the real transaction
Use a three-way comparison: the invoice, your purchase or expense record, and the supplier-reported data. Confirm the supplier, invoice number and date, taxable value, tax amount, goods or services and place of supply. Investigate differences instead of silently treating the invoice as eligible.
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- Open the source purchase order, contract or engagement record.
- Match quantities, service period, description and agreed price to the invoice.
- Compare the invoice with the goods-received note, delivery evidence or service-completion record.
- Compare the same fields with the corresponding GSTR-2B entry.
- Document the reason for any difference and obtain a corrected invoice, debit note or other supplier confirmation where necessary.
A mismatch is not automatically a permanent denial, but an unresolved mismatch is a reason to hold or investigate the claim. Keep an audit trail showing what was checked, who resolved it and which document supports the final amount.
Step 4: Use GSTR-2B as a reconciliation statement, not a guarantee
The GST Portal describes GSTR-2B as an auto-drafted, read-only, static ITC statement intended to help taxpayers take the right credit in GSTR-3B. It is generated from supplier-furnished information and other prescribed data. Use it as a controlled comparison to your books:
- Open the GSTR-2B period that covers the invoice.
- Search by supplier GSTIN, document number and document date.
- Compare taxable value, tax components, amendment indicators and any reversal or ineligibility information shown.
- Mark the document as matched, mismatched, not available or requiring legal review in your reconciliation file.
- For a missing or incorrect entry, contact the supplier and track the expected correction in a later statement.
An “available” amount in GSTR-2B is not blanket approval. You must still verify receipt, business use, taxable-use attribution, blocked-credit rules, payment and deadlines. Conversely, a “not available” or absent entry does not mean the portal has identified every possible legal issue. The portal’s indicators cover specified system scenarios; the recipient remains responsible for self-assessment.
Step 5: Prove that goods or services were received
Section 16 requires receipt of the goods or services. Preserve evidence appropriate to the transaction, such as a goods-received record, delivery acknowledgement, transport document, warehouse entry, acceptance certificate, timesheet, milestone approval, email confirmation or other service-completion record.
For goods supplied in lots or instalments, the Act provides that credit is available on receipt of the last lot or instalment. Do not claim the full credit merely because the first shipment arrived when the supply is contractually delivered in multiple lots.
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When receipt evidence is incomplete
- Place the invoice in an exception queue rather than treating payment alone as proof of receipt.
- Ask the responsible business owner or warehouse team to confirm what was received and when.
- For services, record the period, deliverable or milestone accepted.
- Separate amounts actually received from undelivered quantities when the evidence supports only part of the invoice.
Step 6: Test business use, taxable use and blocked credit
Business versus non-business use
ITC is generally for goods or services used or intended to be used in the course or furtherance of business. Section 17 requires apportionment where an input is partly for non-business use. If a purchase serves both business and personal or other non-business purposes, claim only the permitted business portion using a documented, reasonable allocation.
Taxable, zero-rated and exempt supplies
Section 17 also requires attribution between taxable or zero-rated supplies and exempt supplies. Where an input supports both, calculate and record the eligible portion and any required reversal under the applicable rules. A full invoice match in GSTR-2B does not remove this allocation requirement.
Blocked-credit categories
Section 17 contains categories for which credit is blocked or restricted, subject to the statutory exceptions. Check the nature and purpose of the purchase against those categories before claiming it. Do not rely on the supplier’s tax charge or a portal match to override a blocked-credit provision.
Depreciation exclusion
Section 16 also prevents claiming ITC on the tax component of the cost of capital goods or plant and machinery where depreciation has been claimed on that same tax component under income-tax law. Coordinate the GST claim with the fixed-asset and tax-depreciation records before finalising the return.
Step 7: Check the 180-day supplier-payment condition
Where the recipient does not pay the supplier the value of the supply plus tax within 180 days from the invoice date, section 16 generally requires an amount equal to the ITC availed to be paid back in the prescribed manner, with applicable interest. After payment is made, the credit can be re-availed. The specific 180-day condition does not apply to reverse-charge supplies.
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How to monitor it
- Capture the invoice date, taxable value and tax amount in the payables ledger.
- Track payments against the invoice, including part payments and approved set-offs.
- Flag unpaid balances as they approach 180 days.
- Record any required reversal and interest in the appropriate return and accounting records.
- When the supplier is paid, retain proof and schedule the eligible credit for re-availment in accordance with the applicable rules.
Do not confuse the 180-day payment condition with the separate deadline for first taking credit. Both tests can apply to the same invoice.
Step 8: Check the deadline for taking ITC
The usual section 16(4) deadline is 30 November following the end of the relevant financial year or the date of furnishing the relevant annual return, whichever is earlier. For example, an invoice belonging to a financial year ending 31 March must ordinarily be considered against the 30 November cut-off that follows that financial year, while also checking whether the annual return was furnished earlier.
Special rules may apply in particular situations, including cases involving cancellation of registration and subsequent revocation. Confirm the rule for your facts and the current law before filing. A late discovery in the books does not automatically extend the statutory period.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Step 9: Calculate, claim and reconcile in GSTR-3B
A registered recipient furnishes the section 39 return to take ITC. Before filing GSTR-3B, use a claim schedule that separates matched eligible credit, credit awaiting supplier correction, credit requiring apportionment, blocked or otherwise ineligible credit, and reversals.
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- Remove documents that fail the document, supplier-reporting or receipt test.
- Apply business/non-business and taxable/exempt apportionment.
- Remove blocked credit and any tax component on which depreciation has been claimed.
- Account for payment-related reversals, credit notes, amendments and other required adjustments.
- Compare the final schedule with the current GSTR-2B and the ledger.
- Enter only the supported amount in the relevant GSTR-3B fields and retain the reconciliation.
- Check that the same document has not been claimed in an earlier period, another registration or another return.
GSTR-2B is static and read-only. Save the statement used for the reconciliation and preserve the version of your working paper that explains additions, exclusions and reversals.
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How to handle common exceptions
Invoice is not in GSTR-2B
Check the supplier GSTIN, invoice number, date and reporting period first. Ask the supplier to verify its filing and amendment details. Keep the invoice in a pending-reconciliation list and do not treat portal absence as the only test; independently assess the legal conditions and follow the applicable current rule before claiming.
GSTR-2B amount differs from the invoice
Compare tax components, amendments, credit notes, document type and place of supply. Obtain a corrected document or supplier clarification. Claim only the amount that can be supported by the corrected records and applicable law.
Invoice appears in GSTR-2B but goods have not arrived
Hold the credit until receipt is established. Portal data cannot replace the section 16 receipt condition. For a lot-based supply, wait until the final lot where the Act requires that result.
Purchase is partly exempt-use or personal-use
Document the allocation method, claim the permitted business and taxable-use portion, and record the required reversal. Do not claim the entire tax merely because the supplier charged GST.
Supplier was paid after 180 days
Identify the amount and interest required to be paid back under the prescribed process, record the reversal, and retain payment proof for later re-availment when permitted. The reverse-charge exception should be checked before applying this specific condition.
Registration was cancelled or later revoked
Do not apply the ordinary deadline mechanically. Cancellation and revocation can involve special rules; verify the relevant notification and current statutory treatment for the registration and period concerned.
A practical invoice-review worksheet
| Checkpoint | Evidence to retain | Decision |
|---|---|---|
| Prescribed document | Tax invoice, debit note or other Rule 36 document | Pass, hold or reject |
| Rule 46 particulars | Invoice copy and field-level comparison | Pass or supplier correction required |
| Supplier reporting | GSTR-2B entry and reconciliation reference | Matched, pending or investigate |
| Receipt | Delivery, acceptance or service-completion record | Received, partial or not received |
| Business purpose | Purchase order, contract and cost-centre evidence | Business, mixed or non-business |
| Taxable-use allocation | Allocation calculation and reversal entry | Fully eligible, apportioned or exempt-use |
| Blocked-credit and depreciation review | Section 17 assessment and fixed-asset records | Eligible or restricted |
| Payment | Accounts-payable ageing and bank or settlement evidence | Within 180 days, reversed or re-availment pending |
| Deadline | Financial-year and annual-return timeline | Within section 16(4) period or expired |
| Return claim | GSTR-3B working and filed-return reference | Claimed once and reconciled |
Errors that cause avoidable ITC problems
- “It is in GSTR-2B, so it is automatically eligible.” The statement does not test receipt, business use, blocked credit, depreciation, payment or every statutory restriction.
- “It is absent from GSTR-2B, so no other review is needed.” Portal flags cover specified scenarios; maintain a complete legal and documentary assessment.
- Claiming before receipt. Invoice date or payment date does not replace evidence that goods or services were received.
- Ignoring mixed use. Section 17 apportionment can reduce the claim even where every invoice field matches.
- Overlooking blocked credit or depreciation. A tax charge on an invoice does not override these restrictions.
- Missing either time rule. Monitor both the 180-day payment condition and the section 16(4) claim deadline.
- Claiming twice. Reconcile invoice number, supplier and tax amount across periods, registrations and return workings.
- Failing to record reversals. Credit notes, payment-related reversals and allocation adjustments must be reflected in the reconciliation.
What to retain for an audit or notice
Keep a coherent file rather than an invoice alone: the prescribed document, purchase order or contract, receipt or acceptance evidence, supplier correspondence about corrections, GSTR-2B used for reconciliation, allocation calculations, payment ageing, reversal and re-availment records, and the GSTR-3B working that produced the claim. The file should allow another person to trace the amount from the invoice to the return and explain every exclusion.
Final decision rule
Claim ITC only when the document is permitted and complete, the supplier data is reconciled, receipt is proved, the purchase is used for eligible business purposes, section 17 restrictions and depreciation rules have been applied, payment and timing conditions are satisfied, and the amount is reported once in the return. If one of those tests is unresolved, classify the invoice as pending or ineligible until the facts or documentation are corrected.
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