Reconcile these records in layers: start with your books and issued documents, match applicable invoices and notes to IRP records, verify the resulting GSTR-1 tables, then compare the final GSTR-1 and recipient-side GSTR-2B inputs with the system-generated GSTR-3B. Differences usually come from filing-period cut-offs, delayed portal updates, cancelled IRNs, non-e-invoice supplies, rate-level aggregation or manual edits. Resolve each difference against the underlying document before filing, and retain the evidence.
What you are reconciling—and why the figures differ
GSTR-1 is the outward-supplies return. GSTR-3B is the summary return used to declare liability and, where applicable, input tax credit. E-invoice data is an electronic-document feed from an Invoice Registration Portal (IRP) into specified GSTR-1 tables. GSTR-2B is a recipient-side statement of eligible input-tax-credit information based largely on supplier filings, along with other specified sources. These records are connected, but they are not interchangeable ledgers.
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The practical objective is not to force every report to show the same number. It is to prove that each amount is in the correct tax period, table, document status and tax category, and that any difference has a documented reason. The GST Portal says IRP data generally reaches GSTR-1 within two days, but a portal feed can still represent a different reporting period from the one in your books. A GSTR-3B tile populated by the system is also editable, so the final filed value may differ from the original system calculation.
Use the official guides for the period being filed: GSTR-1 FAQs and e-invoice auto-population, Creation of Outward Supplies Return in GSTR-1, the GSTN advisory on auto-population of e-Invoice details into GSTR-1, and the GSTR-2B FAQ. Portal labels and rules can change.
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Set the period, population and applicability before matching
Define the return period and cut-off
Write down the exact month or quarter, the filing due date, and the date on which you downloaded each report. Do not compare a book ledger through month-end with a GSTR-2B generated under a later supplier-filing cut-off. Keep the source period and the reporting period visible in your reconciliation workbook.
Confirm which documents require an IRN
Do not assume every outward supply is an e-invoice. Applicability depends on notified conditions and turnover history. Identify the taxpayer’s applicable mandate for the period, then separate documents that required an IRN from those that did not. Supplies outside the e-invoice population still need to be reported in the appropriate GSTR-1 tables.
Freeze the source population
Export the accounting-system list of issued invoices, debit notes and credit notes for the period. Include documents issued through branches or separate series, exports, reverse-charge categories and amendments that affect the period. Preserve the export as an unaltered file so later edits can be distinguished from the original population.
- Document number and document date
- Recipient GSTIN, where applicable
- Taxable value and tax amount by rate
- Supply classification, such as B2B, export, reverse charge or note
- IRN and IRN date, if an IRN was required
- Current document status, including valid, cancelled or amended
Match the books to IRP e-invoice records
Use stable identifiers first
Match on document number and date, recipient GSTIN where relevant, taxable value, tax rate and IRN. Document number alone is unsafe when different series or branches reuse numbers. Where a credit or debit note references an original invoice, retain that relationship in the working paper even though the portal table may aggregate the note separately.
Normalize the amount basis
Your books may store invoice lines while the GSTN advisory describes GSTR-1 e-invoice auto-population at tax-rate level. Summarize the accounting data by document, rate and applicable table before comparing totals. A line-level total can differ from a rate-level total merely because discounts, rounding or multiple rates are presented differently. Investigate the underlying tax value rather than treating a presentation difference as an error.
| Comparison axis | What to check | Typical question |
|---|---|---|
| Document identity | Number, date, recipient GSTIN and IRN | Are both systems referring to the same document? |
| Period and cut-off | Document date, supplier filing period and return month | Should this record appear in this period? |
| Status | Valid, cancelled, edited or missing | Was the IRN cancelled or replaced? |
| Classification | B2B, export, reverse charge, note and GSTR-1 table | Is it in the correct table? |
| Amount basis | Taxable value and tax by rate | Is the difference line-level versus rate-level aggregation? |
| Provenance | Books, IRP data, final GSTR-1, GSTR-2B and GSTR-3B | Which record is the authoritative explanation? |
This six-axis framework is a practical diagnostic method, not a prescribed GSTN reconciliation form. It prevents a total-only comparison from hiding a wrong table, period or status.
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Understand how e-invoices populate GSTR-1
Check the relevant tables, not only the summary
According to the GSTN advisory and GST Portal guide, IRP information can populate relevant GSTR-1 sections including B2B supplies and specified reverse-charge categories in tables 4A/4B (the portal guide also identifies 4C, 6B and 6C), exports in table 6A, credit and debit notes in the applicable 9B categories, and the outward HSN summary in table 12 in the version 3 advisory. Confirm the table mapping for your portal version and transaction type.
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Allow for the normal update window
The GST Portal states that e-invoice details generally update GSTR-1 within two days. If an invoice was recently reported to the IRP, first check whether that window has elapsed before classifying it as missing. The update period is operational guidance, not permission to delay a filing past its statutory deadline.
Know what an edit does to provenance
If you edit or delete an auto-populated GSTR-1 record, the Source, IRN and IRN date fields are cleared. The resulting record is treated as separately uploaded. The Excel download of IRP-side data does not incorporate later GSTR-1 edits, so it cannot, by itself, prove what the final edited return contains. Compare the final online GSTR-1 or final return export with the preserved IRP download.
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.” Use that instruction as a control: do not edit a correct auto-populated record merely to make a report total match another system.
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Add supplies that were never auto-populated
E-invoice auto-population is a feed into specified GSTR-1 tables, not a complete return-preparation service. Identify outward supplies that were not required to have an IRN, documents that were outside the IRP feed, and transactions that belong in tables not populated from the relevant e-invoice data. Enter those supplies manually in the correct GSTR-1 table.
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Before adding a manual record, search the applicable GSTR-1 table and the IRP-derived list for the same document. Duplicate entry can overstate outward supplies and tax. For each manual addition, retain the invoice or note, the reason it was outside auto-population, the table selected and the reviewer’s sign-off.
Reconcile the final GSTR-1 to GSTR-3B
Use the system-generated GSTR-3B PDF as a control
Review the GSTR-3B values populated from GSTR-1, IFF or GSTR-1A and GSTR-2B, then download the system-generated PDF breakup. Compare the relevant outward-supply and tax values with the final GSTR-1 after all valid manual additions, edits and deletions. The PDF is a review aid; it does not replace checking the underlying invoices and notes.
Investigate differences by category
- Timing: The document belongs to a different return period, or a supplier filed after the recipient’s GSTR-2B cut-off.
- Scope: A non-e-invoice supply was entered in GSTR-1 but was absent from the IRP population, or vice versa.
- Classification: The transaction is in an export, reverse-charge, B2B or note table that does not feed the comparison you are using.
- Status: An IRN was cancelled, a document was replaced, or the return contains a record that was manually changed.
- Aggregation: Books are line-level while GSTR-1 is summarized by tax rate.
- Override: A populated GSTR-3B tile was edited after the system calculation.
Document every override
GSTR-3B populated values are editable. An edited tile is highlighted, and the system-computed value remains viewable. Before filing, attach a short explanation to the working paper: the original system value, the final value, the source records reviewed, the applicable tax treatment and the person who approved the change. A difference is acceptable only when the underlying records support it.
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Use GSTR-2B correctly for recipient-side ITC checks
GSTR-2B is not a second copy of your purchase register. It includes specified supplier-filed invoices and credit or debit notes, ISD information and IGST import information from ICEGATE. Its period is determined by supplier filing and the prescribed cut-off, so a supplier’s invoice can appear in a later recipient GSTR-2B than the invoice date suggests.
Separate outward reconciliation from ITC reconciliation
Your sales ledger, IRP records and GSTR-1 answer whether your outward supplies were reported. GSTR-2B answers when specified inward-supply information became available in the recipient’s statement. Do not use a GSTR-2B timing difference to alter a supplier’s outward GSTR-1 without checking the supplier document and filing period.
Check the month’s cut-off before calling an invoice missing
- Record the invoice date, supplier GSTIN and supplier document number.
- Check the supplier’s reported period and filing date, where available.
- Confirm the GSTR-2B generation period and cut-off for the return month.
- Search the next relevant GSTR-2B before concluding that the supplier document was omitted.
- Investigate duplicate, cancelled or amended documents separately from timing differences.
The GSTR-2B FAQ and the system-generated GSTR-3B display should be checked for the specific month under review. Eligibility for credit and any disputed classification require the applicable GST rules and, where necessary, professional advice; a reconciliation file alone does not establish entitlement.
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Exception playbook: missing, cancelled or changed records
Missing e-invoice in GSTR-1
- Verify the invoice or note date and the taxpayer’s e-invoice applicability for that document.
- Search the IRP record using the document number, date and recipient details; confirm whether an IRN exists.
- Check whether the relevant GSTR-1 period was already filed and whether the normal portal update window had elapsed.
- Inspect the final GSTR-1 table and source fields for a manual edit or deletion.
- If the corresponding record is genuinely absent, enter it manually in the relevant GSTR-1 period, following the IRP guidance at IRIS IRP’s FAQ.
- Search again before saving to avoid creating a duplicate, then retain the invoice, IRN evidence, entry details and reviewer approval.
Cancelled IRN
Check the cancellation status and the replacement or corrected document. Do not leave both the cancelled document and its replacement as valid outward supplies merely because both appear in different exports. Reconcile the final GSTR-1 record to the valid commercial document and explain the cancellation in the file.
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Because editing clears the Source, IRN and IRN-date fields, link the edited record to the original invoice and IRP evidence outside the portal. Compare the final return, not only the IRP-side Excel file. Record what was changed and why the original auto-populated value was not the actual invoice value.
Discrepancy that remains unresolved
Use GST-system feedback channels for a portal-data discrepancy, while continuing to preserve the accounting and filing evidence. Do not “solve” an unresolved mismatch by entering a second document or by editing a correct record solely to obtain a desired total.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Reporting deadlines and a time-sensitive e-invoice restriction
An IRP release notice dated March 31, 2025 states that, effective April 1, 2025, taxpayers with aggregate annual turnover 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 dated operational rule, not a universal statement about every taxpayer. Verify the latest official advisory, the taxpayer’s turnover history and the document’s applicability before relying on it. The notice is available at IRIS IRP’s e-invoice portal advisory.
Do not confuse the two-day GSTR-1 feed window with the 30-day IRN-reporting restriction. The first describes a usual portal update interval after IRP reporting; the second concerns the latest time certain taxpayers may generate an IRN. They address different events.
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- Lock the population: Export invoices, debit notes and credit notes, and label the tax period, extraction date and accounting version.
- Mark applicability: Identify documents requiring IRNs and those legitimately outside the e-invoice population.
- Obtain IRP evidence: Download or review the IRP-derived GSTR-1 data, noting document status, IRN and IRN date.
- Normalize totals: Summarize books by document, tax rate and GSTR-1 classification so the comparison uses the same basis.
- Match documents: Resolve number/date, GSTIN, value, rate and IRN mismatches before comparing grand totals.
- Review GSTR-1: Check each relevant table, source fields, manual additions and the portal’s update status.
- Complete non-e-invoice reporting: Add eligible supplies not auto-populated, after searching for duplicates.
- Finalize GSTR-1: Preserve the final return export or online review evidence after all edits.
- Review GSTR-3B: Download the system-generated PDF, compare populated values and investigate every edited tile.
- Check GSTR-2B: For recipient-side ITC work, apply the correct supplier-filing cut-off and inspect later statements for timing differences.
- Clear exceptions: Resolve missing, cancelled, amended and duplicate records against primary documents.
- Approve and retain: Keep the books export, IRP data, final GSTR-1, GSTR-2B, GSTR-3B PDF, adjustment explanations and approval together.
What a defensible reconciliation file contains
- A period cover sheet showing the return month or quarter, filing dates and report-download dates.
- The unaltered accounting export and the IRP-derived download or JSON used for comparison.
- A match status for every document: matched, missing, duplicate, cancelled, amended, outside scope or timing difference.
- Separate totals for taxable value and tax by rate and GSTR-1 table.
- A list of manual GSTR-1 entries and edits, with the reason and supporting document.
- The final GSTR-1 review or export, rather than only an IRP-side Excel file.
- The system-generated GSTR-3B PDF and explanations for edited values.
- For ITC review, the relevant GSTR-2B and notes on supplier filing-period cut-offs.
- Reviewer name, review date and evidence of approval before filing.
For downloads, the GST Portal guide notes that Excel files containing fewer than 500 records are available immediately, while larger files may be prepared asynchronously. Record when a large-file request was made and when the file was actually retrieved so the audit trail distinguishes a delayed download from delayed portal data.
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Common mistakes that create avoidable mismatches
Comparing only grand totals
A matching total can conceal a wrong recipient GSTIN, table or tax rate. Always review document identity and classification before accepting a total.
Treating the IRP Excel file as the final return
The IRP-side export does not include later GSTR-1 edits. Use it to establish the feed, then reconcile to the final return record.
Assuming every sale should have an IRN
E-invoicing applicability is conditional. Separate mandated documents from other outward supplies and report the latter through the appropriate GSTR-1 process.
Entering a missing record without searching again
Portal delays, table filters and manual edits can make an existing record appear absent. Verify the document, period and final table before manual entry.
Changing a correct auto-populated value for convenience
Edits remove provenance fields. Modify only when the auto-populated data does not match the actual invoice, and preserve the reason and evidence.
Using GSTR-2B as an invoice-date report
GSTR-2B is cut-off based. A supplier’s filing period can determine when the document appears, so investigate later periods before labeling it missing.
When to obtain professional help
Escalate a reconciliation when the difference affects tax classification, reverse-charge treatment, export reporting, cancellation and replacement of documents, or disputed input-tax-credit eligibility. The official portal material explains data flow and controls; it does not determine a taxpayer’s liability or entitlement in a fact-specific dispute. Keep the issue list, source documents and portal evidence available for your tax adviser.
Quick Recap
Official references
- GST Portal: GSTR-1 FAQs and e-invoice auto-population
- GST Portal: Creation of Outward Supplies Return in GSTR-1
- GST Portal/GSTN: Advisory on auto-population of e-Invoice details into GSTR-1, version 3
- GST Portal: FAQs for Form GSTR-2B
- IRIS IRP: FAQ powered by IRISIRP
- IRIS IRP: E-invoicing Mandate Under GST
- IRIS IRP: E-Invoice 30-Day Reporting Restriction advisory dated March 31, 2025
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