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What input tax credit is—and when entitlement starts
Input tax credit is the mechanism that lets a registered person offset eligible GST paid on business purchases against GST payable on outward supplies. Registration by itself does not make every purchase creditable. Section 16 of the Central Goods and Services Tax (CGST) Act provides the entitlement framework for tax charged on goods or services used, or intended to be used, in the course or furtherance of business, subject to conditions, restrictions and deadlines in the Act and rules.
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For each purchase, treat entitlement as a series of gates rather than as an automatic result of an invoice appearing in your accounting system:
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- Prescribed document: you must hold the applicable tax invoice, debit note, bill of entry or other document recognised by the ITC rules.
- Receipt: the goods or services must actually have been received. Keep practical evidence suited to the transaction.
- Correct tax and particulars: supplier, recipient, document, value, rate, tax and other required invoice details must be accurate.
- Supplier reporting and statement review: compare the purchase with the relevant GSTR-2B entry, while remembering that the statement is not a legal certificate of eligibility.
- No statutory bar: screen for blocked credits, mixed-use apportionment, non-payment consequences, duplicate claims and the applicable time limit.
- Return compliance: claim the amount in the relevant GSTR-3B period and retain evidence of the calculation and filing.
These checks are cumulative. A missing condition can make an otherwise genuine business expense wholly or partly ineligible.
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Documents that support an ITC claim
The document you retain must match the nature of the transaction. A GSTR-2B line is an electronic statement for reconciliation; it does not replace the underlying source document.
| Document | When it applies | What to verify and retain |
|---|---|---|
| Supplier tax invoice | Ordinary taxable purchase of goods or services | Supplier and recipient GSTIN details, unique number and date, description, taxable value, tax rate and amount, and place of supply where relevant. Keep the complete invoice, including any pages or annexures. |
| Debit note | Supplier increases taxable value or tax on an earlier supply | Link it to the original invoice, confirm the additional tax is correctly reported, and record the date on which the debit note is received and considered. |
| Bill of entry | Imported goods | Retain the bill of entry and related import records, and reconcile the tax amount available as import credit with your books. |
| Input Service Distributor (ISD) document | Credit distributed by an ISD to a registered unit | Keep the ISD document and the allocation working that explains the recipient registration and amount distributed. |
| Other prescribed document | Specific transactions covered by the rules | Confirm that the document type is permitted for that transaction and that its required particulars are present. |
Invoice rules determine the particulars that must appear. Check the document against those rules rather than relying on a purchase order, payment receipt or email alone. If an invoice is corrected or amended, retain both the original and the correction so the audit trail is understandable.
A practical monthly workflow for claiming ITC
- Collect the source document. Obtain the invoice, debit note, bill of entry or ISD document before putting the transaction into the claim queue. Scan or download the complete record and assign a consistent internal reference.
- Confirm the transaction occurred. Match the document to a purchase order, contract, delivery receipt, goods-received note, service-completion evidence or another record appropriate to the supply. For services, retain evidence that the work was performed; for goods, retain delivery or inward records.
- Establish business use. Record the cost centre, project or function receiving the purchase. If the item serves both business and non-business purposes, identify the allocation method before claiming. Do the same where it supports both taxable and exempt supplies.
- Check invoice particulars and arithmetic. Compare supplier GSTIN, your GSTIN, document number and date, taxable value, rate, tax amount and place of supply where relevant with the accounting entry. Investigate differences before filing.
- Reconcile supplier reporting. Compare the purchase-register line with the corresponding GSTR-2B document. Track missing, amended, duplicated, cancelled or credit-noted documents in an exception log. GSTR-2B is read-only; you cannot edit it to insert a supplier document that is absent.
- Apply eligibility rules. Remove blocked credits, private portions, exempt-supply portions, duplicates and any amount affected by a statutory reversal or time limit. Do not treat a matching GSTR-2B line as sufficient by itself.
- Calculate the claim and reversals. Preserve the invoice-level calculation showing gross tax, excluded amounts, apportioned credit, temporary reversals and any credit re-availed later under the applicable rules.
- Prepare GSTR-3B. Use the reconciled working to populate the applicable ITC tables and the tables for reversals or ineligible credit. Check the current form instructions and portal workflow for the filing period.
- File and archive. Save the filed return, acknowledgement, calculation version and supporting exception resolutions with the source documents. Lock the period against duplicate re-use of the same invoice.
How to reconcile your purchase register with GSTR-2B
GSTR-2B is an auto-drafted, read-only statement generated from supplier and other reported data. It is useful evidence of what has been reported to the portal, but it does not test every legal condition. Your reconciliation should therefore compare data fields and then apply a separate eligibility review.
| Reconciliation field | What to compare | Typical exception |
|---|---|---|
| Supplier identity | Supplier GSTIN in the purchase register versus the statement | Wrong GSTIN, branch registration or a supplier amendment. |
| Document number and date | Invoice or debit-note number and date, normalising spaces and punctuation without changing the original record | Duplicate number, typo, amended document or a document reported in another period. |
| Taxable value and tax | Taxable value, integrated/central/state or union-territory tax components, rate and total | Rounding difference, partial credit, debit note or supplier data-entry error. |
| Place of supply | Place of supply where it affects tax treatment or allocation | Inter-state versus intra-state classification that does not agree with the invoice. |
| Amendment and credit-note status | Whether the original document was amended or reduced | Credit claimed on an original invoice after a reducing credit note has been reported. |
| Eligibility status | Your legal assessment, including blocked-credit and apportionment checks | Document appears in GSTR-2B but is unavailable under the Act or rules. |
| Duplicate status | Invoice number, supplier and amount against prior periods and ledgers | Same invoice posted twice or claimed once in two returns. |
Use clear exception statuses such as “matched—eligible,” “matched—hold,” “missing from 2B,” “amount mismatch,” “amended,” “duplicate” and “ineligible.” For a missing or mismatched line, contact the supplier, retain the correspondence and record the period in which the correction is expected. Do not alter the downloaded statement to make it agree with your books.
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The portal guidance also identifies cases represented as unavailable in GSTR-2B and warns that other forms of ineligibility require taxpayer self-assessment. Reconciliation is an internal control, not a safe harbour.
Determine the amount that can actually be claimed
Start with the tax shown on valid source documents, then remove or adjust amounts that fail a statutory test. A useful working paper has one row per document and separate columns for:
- gross tax charged;
- business-use percentage, if an allocation is needed;
- taxable-supply percentage, if the purchase supports taxable and exempt outputs;
- blocked-credit amount under the current section 17(5) categories;
- temporary reversal or hold amount;
- eligible credit for the current GSTR-3B;
- credit re-availed later, with the reason and supporting date.
Do not net unrelated adjustments into one unexplained figure. A reviewer should be able to start at the invoice tax and follow each exclusion to a rule, calculation and document.
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Mixed business and non-business use
Where an asset, service or common input serves both business and non-business purposes, apportion the credit using the method required by the current Act and rules. Keep the allocation basis—such as usage records, floor area, headcount or another factually appropriate measure—and update it when use changes.
Taxable and exempt supplies
Common inputs used for taxable and exempt supplies may require proportionate reversal. Maintain the turnover or other data used in the calculation and the period in which the adjustment was made. The correct formula and annual true-up depend on the applicable provisions for the period.
Blocked credits
Section 17(5) lists categories of blocked credit and includes exceptions. Read the current wording for the exact purchase rather than assuming that a business purpose overrides the restriction. Flag blocked categories at invoice entry so they cannot flow into the claim by default.
Non-payment of supplier
Section 16 and the ITC rules contain consequences when the recipient does not pay the supplier the value plus tax within the specified statutory period, subject to the law’s details and exceptions. Monitor unpaid invoices, calculate any required reversal under the current text and retain payment evidence. Check the prevailing provision before calculating interest or a re-availment date.
Time limit
Section 16(4) ties the ordinary cutoff to the due date for the return for September following the relevant financial year or filing of the relevant annual return, whichever is earlier, subject to statutory exceptions and amendments. The applicable result can differ by financial year and invoice, so check the current provision and notifications before accepting a late document.
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Report eligible credit in GSTR-3B
Prepare GSTR-3B from the final working, not directly from an unreviewed GSTR-2B download. Enter eligible inward-supply credit in the appropriate ITC tables and report reversals or permanently ineligible amounts in the applicable reversal or other-ineligible rows. Retain a copy of the draft calculation showing how the figures tie to the purchase register and the statement.
Before submission, perform four controls:
- tie each claimed amount to invoice-level records or a documented aggregate calculation;
- check that reversals in the return agree with the reversal schedule;
- confirm that credit notes, amendments and prior-period corrections have not been counted twice;
- save the filed return, payment or offset details, acknowledgement and the exact working version used.
Portal labels and form instructions can change. Use the instructions displayed for the filing period and confirm whether a correction belongs in the current return or a later permitted period.
Records to retain and how long to keep them
CBIC’s accounts guidance requires records covering input tax and ITC claimed, including registers of tax invoices and related documents. Electronic records are permitted. The displayed guidance cross-references section 36 for the preservation period rather than stating one universal number; check the current Act and any extension that applies when proceedings are pending.
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- source invoice, debit note, bill of entry or ISD document;
- purchase order, contract, delivery or service-completion evidence;
- purchase register or accounting entry showing taxable value and each tax component;
- downloaded GSTR-2B and the reconciliation file, including exception notes;
- business-use and taxable/exempt allocation support;
- payment evidence where non-payment affects entitlement;
- GSTR-3B calculation, filed return and acknowledgement;
- reversal and subsequent re-availment workings;
- supplier correspondence resolving missing or incorrect reporting.
Cross-reference these records with a stable invoice ID. If a document is replaced, retain the prior version and record who approved the replacement and why.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Paper versus electronic recordkeeping
There is no rule-based requirement to buy a particular paper register. Choose the format that lets your staff retrieve records, protect them from alteration and produce a complete trail.
| Control area | Paper files | Electronic records |
|---|---|---|
| Accessibility | Immediate for a well-indexed physical file, but limited to the location where it is stored. | Searchable by supplier, invoice, period or status when indexing is consistent. |
| Reconciliation speed | Manual comparison and higher risk of transcription. | Spreadsheet or accounting-system matching can identify duplicates and value differences quickly. |
| Backup | Requires secure duplicate storage; loss or damage can be difficult to recover. | Use controlled backups and test restoration rather than relying on one device. |
| Access control | Physical keys, custody logs and restricted rooms. | Role-based permissions, strong authentication and access logs. |
| Audit trail | Corrections should be dated, initialled and traceable without obscuring the original. | Preserve version history, change logs and read-only period locks. |
| Production for review | Can be slow when an examiner requests many periods. | Export a complete, readable set with a field index and evidence of system integrity. |
A paper purchase book can help a small team track receipt of invoices, but it cannot establish eligibility and cannot substitute for the prescribed source documents, reconciliation or filed returns.
Design an ITC register that prevents duplicate claims
At minimum, record these fields for each document:
- internal record ID and accounting period;
- supplier legal name and GSTIN;
- invoice or debit-note number and date;
- nature of supply and cost centre;
- taxable value and each tax component;
- place of supply where relevant;
- receipt date and evidence location;
- GSTR-2B period, match status and exception reason;
- business-use and taxable-use allocation;
- blocked, reversed, eligible and re-availed amounts;
- GSTR-3B period and table reference;
- reviewer, approval date and links or file paths to the evidence set.
Use period locks after filing. If a late supplier correction is received, open a new adjustment record that points to the original rather than overwriting the original claim.
Fix common reconciliation and documentation problems
| Problem | Likely cause | Practical response |
|---|---|---|
| Invoice is in the books but absent from GSTR-2B | Supplier has not reported it, reported it in another period or used the wrong GSTIN. | Place the line on hold, contact the supplier, retain correspondence and reassess in the permitted period after correction. Do not edit GSTR-2B. |
| Amount in GSTR-2B differs from the invoice | Data-entry error, amendment, rounding or debit/credit note. | Compare the original and amended documents, obtain a corrected source document where required and claim only the amount supported by the current record. |
| Same invoice appears twice | Duplicate supplier reporting or duplicate posting in the ledger. | Use supplier GSTIN plus document number and date as a duplicate key, investigate and retain the resolution before filing. |
| Invoice has no receipt evidence | Goods-received or service-completion control was skipped. | Obtain appropriate delivery or completion support; if receipt cannot be established, hold the credit until the facts are resolved. |
| Purchase has private or exempt use | Allocation was not identified at entry. | Document the use split, apply the prescribed apportionment or reversal and retain the calculation. |
| Credit was claimed, but supplier remains unpaid | Invoice aged beyond the statutory payment condition. | Review the current section 16 and rule requirements, calculate any reversal and monitor when re-availment becomes permissible. |
| Old invoice discovered near the deadline | Late receipt, missed reconciliation or unresolved exception. | Check the section 16(4) cutoff and applicable exceptions for that financial year before including it. |
Year-end and review checklist
Before closing a financial year, run a separate review rather than relying on monthly matching alone:
- search for invoices posted without a source document or receipt evidence;
- compare the annual purchase register with all relevant GSTR-2B periods and filed GSTR-3B figures;
- review open supplier mismatches and document their expected resolution;
- recalculate mixed-use and taxable/exempt allocations using final available data;
- identify unpaid invoices that may trigger a statutory adjustment;
- check credit notes, debit notes, amendments and import documents for unprocessed changes;
- scan for duplicate invoice numbers across branches and periods;
- review invoices approaching the section 16(4) deadline;
- confirm that electronic backups can be restored and that staff access is limited to business need;
- preserve the final reconciliation, adjustment schedules and return acknowledgements with the year file.
When a GST professional review is worthwhile
Consider a GST practitioner or chartered accountant when a transaction involves a blocked-credit exception, substantial common-input apportionment, imports, ISD distribution, repeated supplier mismatches, a large reversal, a disputed payment condition or an approaching time limit. Give the adviser the invoice, contracts, receipt evidence, ledger, GSTR-2B, reconciliation exceptions and draft return working. A professional review cannot cure a missing document, but it can help apply the current Act, rules and notifications to complicated facts.
Final pre-filing checklist
- Every claimed line has the correct prescribed source document.
- Receipt and business-use evidence is filed.
- Supplier, invoice, value, tax and place-of-supply data have been checked.
- GSTR-2B exceptions are resolved, held or documented.
- Blocked, private-use, exempt-use, duplicate and time-barred amounts are excluded or adjusted.
- Payment-related conditions and required reversals are reviewed.
- The eligible-credit schedule ties exactly to the GSTR-3B figures.
- The filed return, acknowledgement and working papers are stored with the evidence set.
This process makes the claim explainable: a reviewer can move from the return to the reconciliation, from the reconciliation to the books, and from the books to the original transaction documents.
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