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Reconcile the three records in layers, not by comparing their headline totals. Start with your books and issued documents, match applicable invoices and notes to IRP records, verify how those records reached GSTR-1, then compare the finalized GSTR-1 with the system-generated GSTR-3B. For recipient-side input-tax-credit checks, use the relevant GSTR-2B period and cut-off rather than the invoice date alone.
The practical objective is a documented explanation for every difference: timing, an invalid or cancelled IRN, a non-e-invoice supply, rate-level aggregation, classification, or a manual change. The workflow below is for Indian GST returns and IRP-registered e-invoices. E-invoicing applicability depends on notified conditions and turnover history; it does not apply automatically to every taxpayer.
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What each record represents
An e-invoice is generated and registered through an Invoice Registration Portal (IRP). The IRP data then feeds specified sections of GSTR-1. GSTR-1 remains the outward-supplies return, so supplies outside the e-invoice feed still have to be reported. GSTR-3B is the summary return: its tiles may be populated from GSTR-1, IFF or GSTR-1A for outward supplies and from GSTR-2B for input-tax-credit information, but the populated values are editable.
That data flow explains why equal totals are not guaranteed. The IRP feed is based on document date and is aggregated at tax-rate level. Your accounting system may retain line-level rows, while the return presents a rate-level summary. A supplier may file after the cut-off used for a recipient’s GSTR-2B, moving an input document to a later period. A person who edits or deletes an auto-populated GSTR-1 record creates a separately uploaded record rather than changing the IRP extract.
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Use the GST Portal GSTR-1 FAQ and e-invoice auto-population guide and the GSTR-1 creation guide for the portal’s current screens and file-download behavior. For the detailed mapping and edit rules, consult the GSTN Advisory on auto-population of e-Invoice details into GSTR-1 (version 3).
Set the scope before comparing numbers
Fix the return period and cut-off
Write down the financial month or quarter, the applicable GSTR-1 filing period, the GSTR-3B period, and the GSTR-2B cut-off used for the recipient review. Do not move a document between periods merely to make totals agree. A document belongs in the period determined by the applicable GST rules and the filing status for that period.
Confirm which documents required an IRN
Separate documents that were required to obtain an IRN from other outward supplies. Applicability is based on notified conditions and turnover history, so a ledger containing every invoice will normally include both e-invoice and non-e-invoice populations. Keep a field showing the reason a document is outside the IRP population, rather than treating its absence from the IRP report as an error.
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Export the accounting ledger and document register before making adjustments. Include invoices, debit notes, credit notes, exports and any reverse-charge transactions for the period. Preserve the export date and the accounting-system report parameters so a later reviewer can reproduce the population.
Gather the files and fields you need
| Source | What to capture | Why it matters |
|---|---|---|
| Books and issued-document register | Document number and date, recipient GSTIN where relevant, taxable value, tax rate, tax amount, document type and period | Defines the complete business population against which portal records are tested |
| IRP record or export | IRN, IRN status, IRN date, document identifiers and rate-level values | Shows which applicable documents were registered and what was sent to the portal |
| GSTR-1 online view or download | Table, source indicator, IRN and IRN-date fields, taxable value and tax totals | Confirms the record that will actually be filed, including non-e-invoice entries and edits |
| GSTR-2B for the recipient period | Supplier GSTIN, document number and date, taxable value, tax amounts, document type and statement period | Tests the input-tax-credit population using the prescribed cut-off |
| System-generated GSTR-3B PDF and tiles | Populated outward-supply and ITC values, plus any edited tile indicator | Provides the summary control used before filing and an audit trail for overrides |
Use stable identifiers for matching: document number and date, recipient GSTIN where applicable, taxable value, tax rate, and IRN or status. These fields form a practical reconciliation key; the GSTN material describes the underlying source and aggregation behavior rather than prescribing one mandatory spreadsheet layout.
Follow the seven-step reconciliation sequence
1. Build the source population
List every invoice, debit note and credit note issued in the selected period. Tag each row as e-invoice-required, e-invoice-not-required, or requiring an applicability decision. Include exports and reverse-charge categories that may use different GSTR-1 tables. Check that document numbers are unique and that credit and debit notes retain a link to the original transaction where your accounting records support one.
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2. Match the population to IRP records
Match the e-invoice-required rows to IRP data using the document number, document date, recipient GSTIN, taxable value, tax rate and IRN. Investigate a failed match instead of immediately creating another invoice. A different date, an incorrect GSTIN, a tax-rate split or a cancelled IRN can all produce an apparent absence.
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3. Verify the GSTR-1 tables and provenance
Review the actual GSTR-1 tables, not just the summary dashboard. The portal normally receives IRP details within two days, but the filing-period and document-date rules still control where a record appears. Check the Source, IRN and IRN-date fields on each auto-populated row.
| Transaction or population | GSTR-1 location identified in GST guidance |
|---|---|
| B2B supplies, including reverse-charge categories | Tables 4A and 4B; the portal guide also identifies 4C, 6B and 6C for relevant supplies |
| Exports | Table 6A |
| Credit and debit notes | Relevant 9B categories |
| Outward-supply HSN summary | Table 12 in the version 3 advisory |
Use the table appropriate to the transaction’s classification and the current return form. A correct value in the wrong table is still a reconciliation exception.
4. Add supplies that were never in the IRP feed
Enter non-e-invoice outward supplies in the appropriate GSTR-1 tables. The auto-populated feed is not a complete replacement for preparing GSTR-1. Before adding a missing row, search the return by document number, date and recipient GSTIN to ensure that the record is not already present under a different table or rate aggregation.
5. Compare the finalized GSTR-1 with GSTR-3B
Open the system-generated GSTR-3B values and download its PDF breakup. Compare outward taxable value and tax by the applicable categories, then compare the ITC sections with the recipient-side evidence. A GSTR-3B tile populated from GSTR-1, IFF, GSTR-1A or GSTR-2B is editable. An edited tile is highlighted, and the original system-computed value remains viewable.
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Treat every override as a controlled adjustment. Record the GSTR-1 table or GSTR-2B entry, the accounting document, the tax treatment and the reason the generated value was not used. Do not edit a tile solely to force it to equal a ledger total; resolve the underlying document or period issue first.
6. Check GSTR-2B timing for recipient-side ITC
For purchases, inspect the GSTR-2B statement for the period under review. It includes specified supplier-filed invoices and credit or debit notes, input-service-distributor information and IGST import information from ICEGATE. A supplier document can appear in a later GSTR-2B because the supplier filed it later or after the prescribed cut-off. Compare the supplier’s filing period and the statement cut-off before calling the document missing.
7. Resolve, document and retain exceptions
For every unmatched row, check the document date, the period’s GSTR-1 filing status, IRN validity or cancellation, table classification and any manual edit. GSTN-authorized IRP guidance says that data not auto-populated for the corresponding month should be entered manually in the relevant GSTR-1 period. Confirm that no corresponding record already exists before entering it. Keep the source invoice, IRN evidence, GSTR-1 export, GSTR-3B PDF, adjustment explanation and filing review together.
Use a consistent difference diagnosis
When totals differ, classify the exception before changing a return. The following axes turn a vague variance into a testable question.
| Diagnostic axis | Question to answer | Evidence to inspect |
|---|---|---|
| Document identity | Are number, date, recipient GSTIN and IRN the same? | Books, IRP record and GSTR-1 row |
| Period and cut-off | Was the document reported in this period, or did a supplier file after the recipient cut-off? | Document date, filing date, GSTR-2B statement period and return status |
| Status | Is the IRN valid, cancelled, missing or represented by a manually uploaded row? | IRP status, Source field, IRN date and edit history |
| Classification | Is the transaction in the correct B2B, export, note, reverse-charge or HSN table? | Document type, GSTIN, place-of-supply data and GSTR-1 table |
| Amount basis | Are you comparing line-level books with rate-level return aggregates? | Tax-rate summary, taxable value, tax amount and rounding policy in the ledger |
| Provenance | Which record is the filed value: books, IRP extract, final GSTR-1, GSTR-2B or generated GSTR-3B? | Timestamped exports and the GSTR-3B PDF |
Timing variance
A valid invoice may be absent from this month’s GSTR-2B because the supplier filed in a later period. Likewise, an IRP document may not yet be visible in GSTR-1 during the portal’s normal update window. Hold the exception for the applicable cut-off review rather than duplicating it.
Aggregation variance
If the ledger stores several line items at one rate, aggregate taxable value and tax by rate and table before comparing with GSTR-1. Then drill back to the invoice identifiers. This catches both harmless presentation differences and a real rate or classification error.
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Manual-edit variance
Editing or deleting an auto-populated GSTR-1 record clears its Source, IRN and IRN-date fields; the portal treats the resulting row as separately uploaded. The IRP-side Excel download continues to report the IRP data and does not incorporate later GSTR-1 edits. Therefore, that Excel file cannot by itself prove what the final edited return contains.
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Check the IRN status before re-entering a row. A cancelled or invalid record requires a document-level resolution and the applicable return treatment. Search the final GSTR-1 for an existing manual row first; duplicate entry can overstate outward supplies even when the IRP record is absent.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Review GSTR-3B overrides as a control, not a shortcut
The generated GSTR-3B PDF is a review aid. Save it before filing and compare each populated value with the finalized GSTR-1, the relevant GSTR-2B and the books. If a tile is changed, preserve the system-computed amount, the entered amount and a concise explanation tied to source documents.
- For outward supplies, tie the GSTR-3B value to the GSTR-1 tables after adding non-e-invoice supplies and resolving IRP exceptions.
- For ITC, tie the value to the GSTR-2B period, eligible categories and documented adjustments required by the taxpayer’s tax position.
- Recheck that a correction was not already reflected in another tile or table.
- Obtain the required internal review before filing when an override changes tax payable or credit claimed.
Portal-populated values remain editable, so a visual match to the generated number is not evidence that the number is correct. The support for the final value is the underlying document and the applicable period and tax treatment.
Handle common exception cases
An applicable invoice has no IRP match
- Confirm that the taxpayer and document type were subject to e-invoicing for the period.
- Recheck document number, date, recipient GSTIN, taxable value and tax rate for transcription differences.
- Check whether an IRN was generated and later cancelled or whether the portal update is still within its normal window.
- If the corresponding month’s GSTR-1 has no record, enter the supply manually in the correct table as advised by the IRP guidance, after searching for duplicates.
The IRP row is present but GSTR-1 is wrong
Compare the IRP row with the issued invoice and change only the document that is not as issued. The GSTN advisory states: “Taxpayers are advised to modify/update only those documents where the details auto-populated from e-Invoices are not as per the actual invoice issued.” Link the decision to the GSTN advisory and retain the original IRP evidence.
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A record was edited and the audit trail disappeared
The cleared Source, IRN and IRN-date fields indicate that the row is now treated as separately uploaded. Keep both the IRP extract and the final GSTR-1 export, annotate the reason for the edit, and do not use the IRP Excel file as a substitute for the final-return record.
Best Value
A supplier invoice is absent from GSTR-2B
Check the supplier’s filing period and the prescribed cut-off, then look in later GSTR-2B statements before concluding that the document was omitted. The GST Portal GSTR-2B FAQ explains the statement’s populated values and period behavior. Resolve eligibility and timing separately; presence in GSTR-2B is a system-data fact, not by itself a determination of the taxpayer’s entitlement.
Portal timing, downloads and the 30-day rule
Normal GSTR-1 update window
The GST Portal guides describe a general update period of two days for e-invoice details received from the IRP. Use that as an operational expectation, not a reason to postpone a statutory filing or to create a duplicate. If the period is near its filing deadline, capture the portal status and follow the current GSTN instructions.
Excel and machine-readable files
The portal provides online review, Excel or JSON downloads and, where available, API access through a GST Suvidha Provider. The creation guide states that Excel downloads of fewer than 500 records are prepared immediately; larger downloads may be prepared asynchronously. Retain the file-generation date and distinguish an IRP-side extract from a final GSTR-1 export.
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Invoice reporting restriction from April 1, 2025
An IRIS IRP production notice dated March 31, 2025 says that, effective April 1, 2025, taxpayers with aggregate annual turnover (AATO) of ₹10 crore or more must report invoices, credit notes and debit notes within 30 days of the invoice date, with IRN generation restricted outside that window. This is a time-sensitive operational rule. Verify the latest GSTN or IRP notice for the relevant tax period before relying on it, using the IRP release notice and current portal guidance.
Keep a review trail that another person can reproduce
Store one folder or controlled electronic record for each return period. Include the frozen books extract, list of documents subject to e-invoicing, IRP export, GSTR-1 table downloads, GSTR-2B, system-generated GSTR-3B PDF and a reconciliation workbook or report. For each exception, record the document identifier, difference, diagnosis, action, reviewer and date.
- Confirm the period, GSTIN and filing status on every export.
- Show separate totals for e-invoice-fed and manually reported supplies.
- Reconcile both rate-level aggregates and invoice-level identifiers.
- Flag cancelled, invalid, missing and manually edited records distinctly.
- Document GSTR-2B cut-off timing for supplier-side differences.
- Explain every GSTR-3B override and retain the system-computed value.
- Check for duplicate manual entries before filing.
For disputes about classification, eligibility or liability, use current GSTN instructions and obtain advice from a qualified tax professional. The reconciliation process demonstrates how records relate; it does not by itself decide whether a particular tax position or input-tax-credit claim is legally available.
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