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Reconcile each GSTIN and tax period from your books to the filed return and portal statements before you submit a refund claim. Match outward invoices to GSTR-1, purchases to GSTR-2B and GSTR-3B, and—when claiming an IGST refund on exported goods—export invoices to shipping bills and customs data. This process can identify and correct specific mismatches that the GST Portal and Rule 96 recognise; it cannot guarantee that every refund will be processed by a particular date.
What GST reconciliation can—and cannot—prevent
Invoice reconciliation is a controlled comparison between your accounting records and the documents already reported to the GST system. It is designed to find omissions, duplicates, wrong identifiers, period differences and value or tax errors while a correction is still possible. For a goods exporter seeking refund of IGST paid, the comparison has a direct legal consequence: Rule 96 of the Central Goods and Services Tax Rules, 2017 links the refund application’s deemed-filing date to correction of a mismatch between shipping-bill data and the corresponding GSTR-1 data.
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That rule does not make reconciliation a universal refund guarantee. The official material does not establish a national statistic for how often mismatches cause delays, nor a standard refund timeline that applies to every taxpayer. Other checks, such as export-manifest validation, return validity, bank or customs processing and eligibility conditions, can also affect a claim.
Use reconciliation to make the records agree before filing, document every exception and give the person responsible a clear correction route.
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Build one controlled workpaper for each GSTIN and period
Do not combine several registrations or tax periods in one unchecked spreadsheet. Create a separate reconciliation for each GSTIN and return period, with a book-side file and a return/system-side file.
Book-side records
- Sales and purchase registers for the period.
- Issued invoices, debit notes and credit notes, including cancelled or amended documents.
- Export invoices, shipping bills or bills of export and customs records where relevant.
- Accounting entries for advances, subsequent adjustments and tax payments.
- E-invoice data downloaded from the invoice-registration system, where e-invoicing applies.
Return- and portal-side records
- The filed GSTR-1 and its amendment details.
- Downloaded GSTR-2B for the relevant period.
- GSTR-3B workings and filed summary.
- Any invoice-action information from the Invoice Management System (IMS).
- Refund utility output, shipping-bill statements or portal error reports, when an export refund is involved.
The GST Portal supports online GSTR-1 preparation, an offline utility and filing through application service providers or GST Suvidha providers. Whichever method you use, retain the source export, the version submitted, the acknowledgement and evidence of each correction.
Step 1: Reconcile outward invoices to GSTR-1
Include every relevant GSTR-1 category
Start with the issued-document register and map each row to the appropriate GSTR-1 table. Depending on the transaction, that includes invoice-level registered supplies, applicable unregistered-supply summaries, exports, credit and debit notes, amendments, advances and later adjustments. Check the HSN or SAC summary where it applies. A nil period still requires GSTR-1 according to the GST Portal FAQ, so a zero-value return should be tied to a documented zero-activity check rather than left unreviewed.
Match the fields, not just the invoice total
At minimum, compare:
- Recipient GSTIN and legal name.
- Document number, document type and document date.
- Taxable value, tax rate and each tax component.
- Place of supply and supply category.
- Credit-note or debit-note references and the invoice being adjusted.
- Export status, port information and other export identifiers where applicable.
- Amendment number and the version of the transaction ultimately reported.
Use a stable key such as GSTIN plus document type and number, then investigate date and amendment differences separately. A total that happens to agree can still hide a wrong recipient GSTIN or an invoice reported under the wrong category.
Give every exception a defined label
Classify each difference so it has an owner and a correction path:
- Present in books but missing from GSTR-1.
- Present in GSTR-1 but missing from books.
- Duplicate document.
- Wrong recipient GSTIN, document number or date.
- Taxable value or tax amount difference.
- Incorrect supply category or place of supply.
- Credit/debit note not reported or not linked correctly.
- Amendment missing, incomplete or reported in the wrong period.
These are practical control labels, not a list of separately named statutory refund defects. They make it possible to distinguish a bookkeeping correction from a return amendment or a supplier/customer follow-up.
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Correct before filing whenever possible
The GST Portal states that draft invoice details can be modified or deleted until GSTR-1 is filed. Resolve omissions and duplicates at this stage if the underlying transaction supports the change. The portal also validates invoice-series duplication for a GSTIN within a financial year; a duplicate series entry can fail validation.
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Step 2: Reconcile purchases to GSTR-2B, then decide GSTR-3B credit
Match supplier data to your purchase register
For every purchase invoice, debit note and credit note, compare the supplier GSTIN, document number and date, taxable value, tax amount and amendment status with GSTR-2B. Mark the result as matched, absent, duplicated, amended, covered by a credit note, disputed, ineligible or awaiting supplier action.
GSTR-2B describes Table 3 as the available-input-tax-credit summary, including credit that may be availed and credit to be reversed, and Table 4 as not-available ITC for specified cases. Use those classifications as an input to the review, not as an automatic approval of every unmatched amount.
Separate reporting-period timing from a missing invoice
An invoice’s date does not by itself determine when it appears in your GSTR-2B. The supplier’s furnishing of the document in the relevant GSTR-1, GSTR-1A or Invoice Furnishing Facility (IFF) filing controls the applicable recipient statement. If a supplier files an older invoice in a later return, it can appear in the recipient’s next applicable GSTR-2B.
For an absent item, first check the supplier’s filing period and whether an amendment or credit note changed the record. Then request the supplier’s correction or filing evidence. Do not force a timing difference into the wrong GSTR-3B period merely to make the spreadsheet balance.
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Apply legal eligibility separately
The portal’s Table 4 covers specified unavailable-credit scenarios; it is not an exhaustive statement of every statutory restriction. Before including an amount in GSTR-3B, assess the applicable conditions under GST law, including business use, documentation, time limits and reversal requirements. Check for duplicate credit across periods and across amended documents. If a credit is later reversed or becomes eligible after a correction, record the reason and the period of the adjustment.
Step 3: Review e-invoice and IMS activity
Verify auto-populated e-invoice data
For taxpayers covered by e-invoicing, details from the Invoice Registration Portal auto-populate specified GSTR-1 tables for B2B, export and credit/debit-note records. Auto-population is not a final review: the portal permits edits. Download the e-invoice details and compare them with the accounting invoice, then regenerate the GSTR-1 summary after any edit so the summary reflects the changed records.
Investigate records that appear in the accounting system but have no corresponding e-invoice, as well as e-invoices with a different value, tax amount, recipient GSTIN or document number. Keep the invoice-registration reference with the reconciliation evidence.
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The GST Portal’s IMS guidance explains that recipient actions on invoice records can affect GSTR-2B and the resulting ITC treatment. Review whether a record was accepted, rejected or left in another available status, and inspect the effect of amendments. Because portal behaviour and labels can change, use the current IMS guidance for the tax period being filed rather than relying on an old screenshot or process note.
Step 4: Add an export-refund reconciliation when claiming IGST on goods
Identify the refund route first
The GSTR-1 guidance identifies two materially different export routes. Compare them before preparing a claim:
| Route | Refund basis | Core records to reconcile | Tax-payment treatment |
|---|---|---|---|
| Export with payment of IGST | Refund of IGST paid on eligible exported goods | Export invoice, GSTR-1 export entry, shipping bill or bill of export and customs data | IGST is paid and the export data is used for the refund process |
| Export without payment of IGST | Refund of eligible unutilised input tax credit | Export records, relevant returns, ITC ledger and the separate refund application records | Goods are exported under the applicable undertaking or bond route without charging IGST |
The available guidance identifies the alternatives but does not establish which route is preferable for a particular taxpayer. Eligibility, cash-flow needs, documentation and current law must be assessed for the specific business.
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Match the export identifiers exactly
For an IGST-paid goods refund, compare the GSTR-1 export entry with the shipping bill, bill of export and customs records. The GST Portal’s entry instructions call for the invoice number and date, port code, shipping-bill number and date, total invoice value, whether GST was paid and the taxable value. Check spelling, punctuation, leading zeroes and date formats; a visually similar identifier can still fail a system match.
Understand the Rule 96 mismatch effect
Rule 96 treats the shipping bill as the refund application for IGST paid on exported goods, subject to the rule’s other requirements, including export-manifest and valid-return conditions. Where shipping-bill information and GSTR-1 information do not match, the rule states that the application “shall be deemed to have been filed on such date when such mismatch in respect of the said shipping bill is rectified by the exporter.”
Consequently, reconcile before filing and, if a mismatch is reported, correct the exact shipping bill or return data through the permitted process and retain proof of rectification. This provision concerns the IGST-paid export-of-goods route; it is not a general rule for every GST refund claim.
Prepare the refund utility from the filed return
Use invoice details consistent with the GSTR-1 version actually filed, including later amendments. Portal troubleshooting material identifies three concrete errors:
- “Invoice not found in return”: verify that the invoice is in the relevant GSTR-1 export table and that the GSTIN, number and period are correct.
- “Invoice value is not as per return”: compare the utility’s total invoice value and taxable value with the filed GSTR-1 values, including amended values.
- “Invoice type is not matching as per return”: select the same export or document classification that appears in the return.
Spreadsheet software can change date formats when a utility file is opened or saved. Validate the date format and the shipping-bill and invoice identifiers in the final file before upload.
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Do not mark a mismatch resolved merely because someone changed a spreadsheet cell. For each exception, record:
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- GSTIN, tax period and document reference.
- Book-side amount and return or statement amount.
- Issue category and the person responsible.
- Correction route: book entry, supplier follow-up, return amendment, portal action or refund-utility correction.
- Date of action, acknowledgement or reference number.
- Evidence that the corrected return, statement or utility now agrees.
Save the final registers, filed-return acknowledgement, GSTR-2B download, amended records, export statements and refund submission with the workpaper. This is a sound record-control practice; it should not be described as a quoted portal retention mandate unless a current law or notification specifically requires it.
Use a short pre-filing control checklist
- Confirm the GSTIN, tax period and filing frequency on every file.
- Reconcile all issued sales documents to GSTR-1, including notes, amendments, exports, advances and applicable HSN/SAC data.
- Resolve duplicate invoice numbers and portal validation errors before filing where possible.
- Download GSTR-2B and match supplier GSTIN, document details, values, amendments and credit notes to the purchase register.
- Investigate absent records by checking the supplier’s filing period rather than assuming the invoice is permanently missing.
- Apply ITC eligibility rules and check for duplicate claims before finalising GSTR-3B.
- Review e-invoice auto-population, any edits and the regenerated GSTR-1 summary.
- Review IMS actions and their effect on GSTR-2B and ITC.
- For IGST-paid goods exports, match GSTR-1 to shipping-bill and customs data and test the refund utility using the filed return’s values.
- Close every exception with evidence and preserve the acknowledgement.
Timing and filing-period cautions
The GSTR-1 FAQ gives ordinary due-date patterns of the 11th of the succeeding month for monthly filers and the 13th after quarter-end for quarterly filers, subject to extensions. Verify the notification and portal calendar for the tax period you are filing; a due-date pattern from an earlier period should not be treated as a permanent deadline.
Likewise, a later supplier filing, amendment facility, IMS action or refund-utility rule can change how a record appears. Use the current portal instructions for the relevant period and keep the date of the guidance used in your workpaper.
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The invoice is in the books but absent from GSTR-1
Confirm that it belongs in the period and table selected, then check draft-versus-filed status. If the return is still open, add or correct the record. If it is filed, use the applicable amendment route and document the reporting period.
The invoice is absent from GSTR-2B
Ask the supplier when and where it was furnished, check subsequent GSTR-1, GSTR-1A or IFF filings and wait for the next applicable statement where the rules require it. Do not claim or defer ITC solely on the invoice date.
The refund utility cannot find an export invoice
Compare the utility row with the filed GSTR-1 export entry character by character, including document type, number, date and GSTIN. Check whether an amendment created the version you need and correct the return or utility through the permitted route.
Shipping-bill and GSTR-1 data disagree
Identify which system contains the incorrect identifier or value, correct it through the authorised process and retain the rectification evidence. Under Rule 96, the deemed filing date is tied to rectification of the mismatch for that shipping bill, subject to the rule’s other conditions.
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