For Indian GST, the core filing sequence is to report outward supplies in GSTR-1, reconcile purchase-side details against GSTR-2B, then report eligible input tax credit (ITC), reversals and tax liability in GSTR-3B. GSTR-2B helps with reconciliation; it does not, by itself, establish that every listed invoice qualifies for credit. Check the GST Portal for the filing frequency and due date that apply to your registration and tax period.
How the three returns fit together
Each form has a different role in the filing cycle. GSTR-1 reports outward supplies, GSTR-2B provides a system-generated view of inward-supply information, and GSTR-3B is where taxpayers report liability and credit for the period. The sequence matters: supplier reporting and later amendments can change what appears in a recipient’s GSTR-2B.
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| Form or statement | Role in the process | What to check |
|---|---|---|
| GSTR-1 | Report relevant outward-supply details for the tax period. | Correct period, invoice details, amendments and completeness of the draft. |
| GSTR-2B | Provide inward-supply information based on supplier filings and other specified data feeds. | Compare invoice-level entries with purchase records; investigate missing, amended, duplicate or mismatched items. |
| GSTR-3B | Report self-assessed tax liability, eligible credit, and applicable reversals or ineligible credit. | Reconcile with records and apply the legal eligibility rules rather than relying only on generated summaries. |
The GST Portal explains the forms and their operation in its GSTR-1 guide and GSTR-2B FAQs.
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In practical terms, this is a reporting-and-reconciliation workflow, not a single button that turns every purchase invoice into credit. GSTR-1 is the supplier-side outward-supply report; the recipient uses the resulting information visible in GSTR-2B as one input to its checks. GSTR-3B then reflects the taxpayer’s own assessment of liability, eligible ITC and required adjustments. Keep the three stages connected by period and supporting records so that a difference can be traced to its source rather than copied forward unexplained.
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First identify your return profile and tax period
Before preparing a return, confirm your registration type, applicable filing frequency and the exact tax period. GSTR-1 is required for normal and casual registered taxpayers making outward supplies, subject to the exclusions described by the portal. The portal also says a nil GSTR-1 is required when there is no business activity.
Qualifying taxpayers may have quarterly GSTR-1 filing available. The portal says taxpayers who opt for quarterly filing also file GSTR-3B quarterly. Do not assume your own frequency from another taxpayer’s pattern: confirm it in your GST Portal account and for the particular period. The portal’s GSTR-1 description includes a ₹5 crore threshold in explaining quarterly eligibility; treat that as an eligibility criterion described by the portal, not as a universal rule for every return profile.
A reliable starting check is to match the return tile to the taxpayer and period you intend to file. Verify the financial year, tax period and whether the account is set up for the expected frequency before gathering figures. If your filing profile or eligibility for quarterly returns is uncertain, use the portal’s current guidance for that registration rather than inferring it from the amount or timing of another business’s returns. The portal’s description of the ₹5 crore threshold is useful context, but it does not replace checking the applicable eligibility conditions.
Also distinguish a nil return from no filing obligation. The portal says a nil GSTR-1 is required when there is no business activity. If a return tile is required for your profile and period, the lack of transactions is not, on its own, a reason to skip it. Follow the relevant portal instructions for a nil filing, including the separate GSTR-3B nil-return guidance where applicable.
Prepare and file GSTR-1
- Select the period: Sign in to the GST Portal and choose the applicable return period. Check the registration profile and filing frequency before entering figures.
- Prepare outward-supply details: Enter the invoices and other relevant outward-supply information for the period. The portal lists online preparation, an offline utility and preparation through third-party ASP/GSP tools as available methods.
- Review the draft: Check the period, invoice-level information, amendments and completeness against your books and source documents. Correct errors before submission.
- File the return: Complete the portal’s filing process for the selected return. Keep the filed return and supporting records with your tax-period documentation.
The GST Portal describes GSTR-1 preparation and filing options in its GSTR-1 guide. A nil return is still a filing obligation where applicable; no business activity does not by itself mean you can ignore the return.
Before you move from preparation to filing, use a short period-end review. Confirm that the draft covers the correct tax period, compare the reported outward-supply details with the underlying records, and check that amendments have been assigned to the intended period. If you use an offline utility or an ASP/GSP tool, the same review still matters: a preparation method does not remove the responsibility to check the content of the draft. Save the final filed return and the records used to prepare it together, so you can later explain how reported figures were assembled.
Do not treat the fact that a return can be prepared in more than one way as evidence that the methods have identical controls. A portal workflow may suit a taxpayer who wants to prepare directly; an offline utility or third-party tool may fit a different preparation process. Whichever route you choose, evaluate it for support for your return type and filing frequency, the ability to preserve amendments and records, and a clear review step before filing.
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Reconcile GSTR-2B with purchase records
GSTR-2B is built from information filed by suppliers in GSTR-1, IFF or GSTR-1A, together with other specified data feeds, including certain import information. Treat it as a reconciliation statement: compare each relevant entry with invoices, debit notes, credit notes, goods or services received, and the corresponding purchase records.
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- Invoice present and matching: Verify the document, receipt, business use and other eligibility conditions before including credit.
- Invoice missing: Check that the supplier’s details and filing period are correct, and follow up with the supplier where appropriate. A missing entry calls for investigation and a current-law eligibility check; it does not prove that credit is automatically available or permanently lost.
- Amended or added entry: Match the revised details to the original record and note the period in which the change appears.
- Duplicate entry: Determine whether the records represent one transaction reported more than once or distinct documents. Do not claim credit twice for the same supply.
- Credit note or mismatch: Reconcile the adjustment with the underlying transaction and records before deciding its effect on the claim.
The GST Portal’s GSTR-2B FAQs explain that its summaries classify data according to specified scenarios. They are a reconciliation aid, not a complete legal eligibility decision.
To check ITC in GSTR-2B in a controlled way, start with the correct portal period and compare the statement against a purchase register for that same period. A useful reconciliation record connects the supplier and document details to the underlying invoice or debit note, the amount in the books, the amount or status in GSTR-2B, and the resolution of any difference. This makes it easier to distinguish a genuine mismatch from an item that is simply reported in a different period.
When a line does not match, avoid changing the claim before you understand the cause. Check the original document and purchase record first; then determine whether the variance is associated with a supplier amendment, a credit note, a duplicate or a missing record. Record what was checked, what remains unresolved and what follow-up is needed. This is useful whether the final decision is to include credit, exclude it, make an adjustment or revisit it after supplier reporting changes.
GSTR-2B includes information from supplier reporting and other specified feeds, so a missing item can have several possible explanations. Verify the supplier identity, document details and relevant period, then ask the supplier to check its reporting or correction where appropriate. Keep the follow-up linked to the invoice, rather than treating a general conversation as a resolution. If the entry appears after a supplier correction, link the later statement entry to the original purchase record and note the period in which it becomes visible.
Check ITC eligibility invoice by invoice
Before claiming credit, assess the particular document and transaction under the rules that apply to your registration and circumstances. A GSTR-2B entry is not automatic approval: the portal says its “ITC not available” summary covers specified scenarios only, and other legal provisions may also make credit unavailable.
- Entitlement: Confirm that the taxpayer and transaction are entitled to credit under the applicable GST rules.
- Prescribed document: Keep the supporting tax invoice, debit note, bill of entry or other prescribed document. CBIC’s Input Tax Credit Rules set out documentary requirements.
- Receipt: Confirm that goods or services were received as required for the claim.
- Permitted use and restrictions: Check whether the supply is used in a way that qualifies and whether a blocked-credit rule or another restriction applies.
- Supplier reporting and reconciliation: Review the corresponding GSTR-2B entry and resolve material discrepancies against source records.
- Payment and reversals: Address applicable payment, reversal and apportionment requirements. CBIC’s rules describe a reversal consequence where the recipient fails to pay the supplier within the prescribed period.
- Claim deadline: Confirm the time limit for the invoice or debit-note financial year and the relevant facts, amendments and annual-return status.
The CBIC sectoral FAQs contain an older formulation referring to September and the annual return. A November 2025 Telangana Commercial Taxes Department handbook on blocked credit discusses the later 30 November formulation for applicable years. Those materials do not settle every transitional or amended-law situation. Check the consolidated legislation and notifications for the invoice year and circumstances rather than treating either formulation as a universal deadline.
Think of the eligibility review as a set of separate questions, not a single check mark. A document may appear in GSTR-2B and still need a review of receipt, use, restrictions, payment conditions, apportionment or other applicable rules. Conversely, an absent entry is a reconciliation issue that needs follow-up and current-law review; the statement alone does not establish that a claim is permanently lost or that it can be taken without further checks. The portal’s “ITC not available” classifications cover specified situations, not every possible reason credit may be unavailable.
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Pay attention to non-payment and reversal requirements as well. CBIC’s rules describe a reversal consequence where the recipient does not pay the supplier within the prescribed period. The exact treatment should be checked against the applicable rule and circumstances; do not assume that the initial credit decision settles later payment-related obligations. Where apportionment or another adjustment applies, capture it separately so the amount reported in GSTR-3B can be traced to the underlying calculation.
The deadline for claiming ITC needs invoice-year-specific checking. The materials reviewed do not support treating either the older September/annual-return wording or the later 30 November formulation as universally applicable across all years and transition situations. Confirm the consolidated legislation, amendments and notifications relevant to the invoice or debit-note year and the annual-return status before relying on a cut-off date.
Report eligible credit and liability in GSTR-3B
Use the portal’s generated summaries to support reconciliation, then make your own self-assessment. Report eligible credit and liability in the relevant GSTR-3B tables, account for applicable reversals and ineligible credit, and discharge the resulting tax liability through the prescribed process. The portal identifies relevant tables for available and unavailable entries, but the taxpayer remains responsible for applying the law to the transaction facts.
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- Separate eligible from ineligible amounts: Record credit only after the applicable conditions and restrictions have been checked; identify reversals and other required adjustments separately.
- Complete the return: Enter the required liability and credit figures in GSTR-3B for the selected period, using portal summaries as a cross-check rather than as a substitute for review.
- Review and file: Check the return against the reconciliation and records, file it through the portal, and retain the filed return and supporting calculations.
- Pay the balance due: Discharge any tax liability through the portal’s prescribed payment process and retain the payment record.
For a nil filing, follow the portal’s GSTR-3B nil-return instructions where that procedure applies.
Before filing GSTR-3B, compare the figures you are about to report with the supporting reconciliation, not only with a generated summary. Make sure eligible credit is separated from unavailable credit and from amounts that require reversal or another adjustment. If a discrepancy is still under investigation, document the issue and apply the treatment required by the facts and current rules rather than assuming the portal’s classification resolves it.
After filing, retain the filed return, payment record if a balance was due, and the reconciliation that supports the reported figures. A clear trail should let you move from the GSTR-3B amount back to the relevant purchase documents and eligibility decisions. That trail also helps you identify whether a later supplier correction changes what appears in a subsequent GSTR-2B, without confusing that later statement with the return already prepared for an earlier period.
Correct GSTR-1 data and understand the timing
GSTR-1A is an optional facility the GST Portal describes for adding or amending details for the same tax period after GSTR-1 has been filed or after its due date, whichever is later, and before GSTR-3B is filed for that period. Changes made through GSTR-1A flow into the taxpayer’s GSTR-3B. For the recipient, ITC related to added or amended records appears in the next period’s GSTR-2B. That timing can create a period mismatch between the original purchase record and the statement in which the correction becomes visible, so track amendments by supplier and period.
This timing is a practical reason to maintain a link between the original invoice and the amended or added record. When the recipient later reviews GSTR-2B, an entry may appear in the next period because the supplier used GSTR-1A; do not mistake the later appearance for a second supply or claim credit twice. Reconcile the corrected details to the underlying transaction and decide the treatment for the relevant period under the applicable rules.
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Find the due date for your return
GSTR-1 and GSTR-3B due dates depend on filing frequency, return period and applicable notifications or extensions. The GST Portal does not establish one due date for every taxpayer. To check the relevant date, select the financial year and return period in the GST Portal Returns Dashboard and review the due date shown for the required return tile. Recheck the dashboard for the period you are actually filing.
A date remembered from a prior period or another taxpayer’s filing pattern may not be the date that applies to your return. Use the dashboard for the specific financial year and tax period, and confirm the tile for the required return. This avoids treating a general calendar or a different filing frequency as a substitute for the portal’s period-specific information.
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For recurring preparation, maintain a period-wise record that connects each purchase document to its supplier, GSTR-2B status, eligibility decision, adjustment and GSTR-3B treatment. Whether you use a spreadsheet, accounting system or a filing tool, evaluate it on practical controls rather than a claim that it guarantees eligibility.
- Does it support the return type and filing frequency you use?
- Can it reconcile invoice-level records against GSTR-2B?
- Does it preserve amendments, credit notes, reversals and the reason for each adjustment?
- Can you export records and retain an audit trail?
- Are access controls and data handling appropriate for tax and supplier records?
- Is a qualified reviewer available for eligibility questions that turn on transaction-specific facts?
For complex or disputed transactions, seek advice from a qualified GST practitioner who can review the documents and circumstances. A software match can flag a difference, but it cannot resolve every legal question about whether a credit is claimable.
A spreadsheet may be enough for a process that can reliably track documents, periods and decisions; an accounting system or filing tool may be more suitable where invoice volumes, recurring reconciliations or review handoffs make manual tracking difficult. These are workflow comparisons, not claims that a particular category of tool guarantees compliance. Assess whether the option supports your return type and frequency, captures invoice-level differences, handles amendments and credit notes, records reversals, and allows useful exports and an audit trail.
Also evaluate who can access tax and supplier data and how the tool handles it. If a reviewer needs to assess fact-specific eligibility, confirm that the workflow gives them the records and context needed to do so. A matching feature can surface a discrepancy, but it cannot establish receipt, permitted use or the legal effect of a restriction without considering the transaction. Software is an optional workflow aid; it does not replace the taxpayer’s checks or qualified advice where the facts call for it.
Common filing problems and the next check
- A purchase invoice is absent from GSTR-2B: Verify the supplier identity, invoice details and relevant period; check whether the supplier has filed or corrected the details, then follow up and assess the applicable rules.
- A GSTR-2B amount differs from your books: Trace the difference to the original document, amendment, credit note or duplicate before changing the claim.
- A corrected supplier record appears in a later statement: Link it to the original transaction and apply the period treatment that follows the correction’s appearance.
- The return tile or due date is unclear: Confirm the financial year, period, return profile and frequency on the Returns Dashboard instead of relying on a general calendar.
- The portal marks credit as available but the facts are uncertain: Review restrictions, receipt, documentation, payment and other conditions before including it.
Another common process problem is carrying a difference forward without recording why it remains open. For an unresolved invoice, note the mismatch, the supplier follow-up and the next check. This gives the next period’s preparer a basis to distinguish a newly reported correction from a duplicate, and prevents an unresolved item from being treated as automatically eligible just because it eventually appears in a statement.
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Frequently Asked Questions
How do I file GST returns in India?
Confirm your registration profile, filing frequency and tax period first. Prepare and review outward-supply details in GSTR-1, reconcile purchase-side information against GSTR-2B, then report self-assessed liability, eligible ITC and applicable reversals or ineligible credit in GSTR-3B. Use the GST Portal for the due date and filing instructions for the specific period.
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How do I claim input tax credit in GST?
Review ITC invoice by invoice. Check that you are entitled to credit, have a prescribed supporting document, received the goods or services as required, and have considered use restrictions, supplier reporting, payment or reversal obligations, apportionment and the applicable claim deadline. A GSTR-2B entry is a reconciliation input, not automatic legal approval.
How do I check ITC in GSTR-2B?
Select the relevant period and compare GSTR-2B entries with purchase records and supporting documents. Investigate missing, amended, duplicate, credit-note or mismatched items, and record how each difference is resolved. Use the statement to support reconciliation, then apply the eligibility rules to the facts before reporting credit in GSTR-3B.
Why is an invoice missing from GSTR-2B?
GSTR-2B reflects supplier filings and other specified data feeds, so first verify the supplier, invoice details and period in your records. Check with the supplier about filing or correcting the details where appropriate. A missing entry needs follow-up and a current-law eligibility review; it does not by itself prove that credit is automatically claimable or permanently lost.
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No. The GST Portal’s summaries classify information according to specified scenarios, and other legal restrictions may also apply. Check the document, receipt, use, restrictions, payment and reversal conditions, and other requirements relevant to your circumstances before claiming credit.
When is the due date for GSTR-1 or GSTR-3B?
The date depends on the taxpayer’s filing frequency, return period and applicable notifications or extensions. Select the financial year and period in the GST Portal Returns Dashboard and check the due date shown for the required return tile. Do not assume one general date applies to every taxpayer.
What should I do if a supplier corrects an invoice after filing GSTR-1?
The GST Portal describes GSTR-1A as an optional facility for adding or amending same-period details after GSTR-1 filing or its due date, whichever is later, and before GSTR-3B for that period is filed. The changes flow into the supplier’s GSTR-3B; the recipient sees ITC for added or amended records in the next period’s GSTR-2B. Link the changed record to the original transaction and reconcile the timing.
The Bottom Line
File the return for the profile and period that apply to you, reconcile GSTR-2B with purchase records, and assess ITC against the documents and legal conditions invoice by invoice. Report eligible credit, liability and required adjustments in GSTR-3B, and verify due dates and claim deadlines against current portal guidance and the law applicable to the relevant period. A portal match or software reconciliation can assist, but neither replaces the eligibility review.
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