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Reconcile Indian GST data in layers: first match your books and issued documents to IRP e-invoices, then verify the e-invoice-fed records in GSTR-1, and finally explain the values that flow into GSTR-3B. For input-tax-credit review, check the recipient-side GSTR-2B for the relevant cut-off period rather than assuming that an invoice appears in the month printed on it.
The reliable result is not merely three matching totals. It is a documented trail from each invoice, debit note and credit note to its IRN status, GSTR-1 table, applicable period, GSTR-2B treatment where relevant and final GSTR-3B value. Portal data can be delayed, aggregated, manually edited or reported in a later period, so every difference needs a reason tied to an underlying document.
What each GST data set represents
These records are connected, but they are not interchangeable ledgers. A reconciliation fails when a taxpayer compares a document-level accounting report with a rate-level return summary, or compares a supplier’s outward-supply period with a recipient’s GSTR-2B cut-off.
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|---|---|---|---|
| Books and sales register | Invoices, debit notes, credit notes, taxable values, tax rates and tax amounts recorded by the business. | Establish the complete source population for the tax period and the commercial facts behind every adjustment. | Accounting records do not prove that an IRN was generated or that a return was filed. |
| IRP e-invoice data | Documents reported to an Invoice Registration Portal, with identifiers such as document number, document date, IRN and status. | Confirm which applicable documents received a valid IRN, whether a document was cancelled and what data was sent for GSTR-1 auto-population. | It covers only documents subject to e-invoicing and successfully reported to the IRP; it is not a complete outward-supply return. |
| GSTR-1 | The supplier’s outward-supply return, including auto-populated e-invoice records and supplies entered through other methods. | Check the correct table, period, classification, taxable value and tax against the source records. | Auto-populated records can be edited or deleted, and the final return can therefore differ from the original IRP feed. |
| GSTR-2B | A recipient-side, period-based statement containing specified supplier-filed invoices and notes, ISD information and IGST import information from ICEGATE. | Assess the supplier documents available for input-tax-credit review for the selected return month. | Appearance depends on supplier filing and the prescribed cut-off, not solely on the invoice date. |
| GSTR-3B | The summary return in which system-generated values can be populated from GSTR-1, IFF, 1A and GSTR-2B, as applicable. | Use the generated values and PDF breakup as a control, then support any edit with the underlying records and tax treatment. | Populated tiles are editable. The final filed value is not automatically correct merely because the portal generated it. |
The supplier-side GSTR-1/GSTR-3B comparison and the recipient-side GSTR-2B check answer different questions. Keep those workstreams separate in the reconciliation file, even when they concern the same supplier or invoice.
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Set the period and source population before comparing totals
Define the return period and cut-off
Write the exact month or quarter, the relevant GSTR-1 filing period and the GSTR-3B period at the top of the workpaper. Record the date on which the portal data was downloaded. This matters because an e-invoice may be created on one date, included in a return based on document date, and become visible in a recipient’s GSTR-2B only after the supplier files by the applicable cut-off.
Portal guidance says e-invoice details generally update the relevant GSTR-1 records within two days. Treat that as an operational update window, not permission to file a return without checking late-arriving records. If you download before the window has elapsed, label the file as provisional and refresh it before final review. The GST Portal GSTR-1 FAQ and e-invoice auto-population guide and the GSTR-1 creation guide describe the portal’s current workflow.
Identify documents that are actually in scope for e-invoicing
Start with every issued invoice, debit note and credit note in the books, then mark which documents were required to obtain an IRN under the notified conditions applicable to that taxpayer. Do not assume that every outward supply is an e-invoice. Applicability depends on the relevant notification, taxpayer status and turnover history; confirm the rule for the tax period being filed.
Keep non-e-invoice supplies in the source population. They still have to be reported in the appropriate GSTR-1 table even though no IRP record will exist for them.
Collect the evidence set
- Sales-register and outward-tax reports for the period, including invoices, debit notes and credit notes.
- IRP or IRP-authorized portal exports showing document number, document date, IRN and status.
- GSTR-1 table data, source indicators and any final return export.
- GSTR-2B for the recipient’s month, including its cut-off and download date, when input tax credit is being reviewed.
- System-generated GSTR-3B values and the downloadable PDF breakup.
- Notes explaining corrections, late reporting, cancelled IRNs, classification changes and manual entries.
Step-by-step reconciliation workflow
1. Build a document-level control register
Give each source document one row. At minimum, capture document number, document date, recipient GSTIN where relevant, document type, taxable value, tax rate, tax amount, place-of-supply or export classification where used by your return process, applicable GSTR-1 table, e-invoice applicability, IRN, IRN date, IRN status and the intended return period.
Use a stable key that does not depend only on a spreadsheet row number. A practical key combines document type, document number, document date and recipient GSTIN. Keep the original document number exactly as issued; do not silently normalize punctuation or leading zeroes. Record a separate matching status such as matched, missing in IRP, missing in GSTR-1, period difference, cancelled or manual edit.
2. Match the books to IRP records
For documents that should have an IRN, compare the source register with the IRP data using document number and date, recipient GSTIN where relevant, taxable value, tax rate and IRN/status. The exact matching columns are a practical control rather than a government-prescribed template; the objective is to prove that the document in the books is the same document reported to the IRP.
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Investigate each unmatched row before moving to return totals. A value difference may be a genuine amendment, a rounding or rate-level aggregation issue, a wrong document number or a record that was never reported. A matching IRN with a different taxable value is not a clean match merely because the document number agrees.
3. Reconcile IRP data to GSTR-1
GSTR-1 auto-population is based on document date, and the GSTN advisory explains that line information is aggregated at tax-rate level. Therefore, summarize your invoice ledger on the same basis before comparing totals. For example, if one invoice contains lines at two rates, compare the taxable value and tax for each rate and applicable table, not only the invoice grand total.
The portal’s e-invoice data is presented with source, IRN and IRN-date indicators. Review those fields alongside the amounts. A record that appears in the correct table but has no expected provenance field requires investigation rather than automatic acceptance.
| Supply or document category | GSTR-1 area identified in portal guidance | Reconciliation check |
|---|---|---|
| B2B supplies, including relevant reverse-charge categories | Tables 4A/4B; the portal guide also identifies 4C, 6B and 6C for applicable categories. | Confirm recipient GSTIN, document type, tax rate, reverse-charge treatment and taxable/tax amounts. |
| Exports | Table 6A. | Check export classification and document details against the books and the source document. |
| Credit and debit notes | Relevant 9B categories. | Match the note to its original transaction, date, taxable value, tax and IRN/status where e-invoicing applies. |
| Outward HSN summary | Table 12 in the v3 advisory. | Reconcile the rate- and HSN-level summary to the document population after the detailed tables are correct. |
The table mapping can change with portal updates and taxpayer circumstances. Use the current GST Portal instructions for the period rather than copying a prior month’s mapping without review.
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The GSTN advisory makes clear that e-invoice auto-population is a feed into specified GSTR-1 tables, not a replacement for preparing the return. Enter non-e-invoice supplies, exempt or other applicable outward supplies, and any other records required in their respective tables.
Before adding a manual row, search the GSTR-1 data for the same document. Duplicate entry is a common cause of an apparent excess when an IRP record arrived after a preparer had already typed the invoice. If the record exists but is wrong, correct the existing record according to the portal workflow instead of adding a second version.
5. Check the timing and the final state of GSTR-1
Refresh or re-download GSTR-1 after the normal auto-population window and after any late IRP activity. Compare the final return records—not just an early IRP export—to the books. The GST Portal provides online review, Excel or other download options, and the GSTN advisory also describes JSON and API access through a GST Suvidha Provider.
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Open the system-generated GSTR-3B values and download the PDF breakup before filing. Compare the outward-supply and tax figures to the final GSTR-1 position, taking into account the tax treatment and period applicable to each item. Do not expect a document-by-document display in a summary return; use the GSTR-1 control register and rate/table summaries to explain the bridge.
GSTR-3B values populated from GSTR-1, IFF, 1A and GSTR-2B are editable. When a tile is edited, the portal highlights the change and continues to show the system-computed value. Treat an override as a controlled adjustment: record the original generated amount, the final amount, the reason, the supporting documents and the person who reviewed it.
7. Perform the recipient-side GSTR-2B check
For input-tax-credit work, download GSTR-2B for the exact return month and note its prescribed cut-off. It includes specified supplier-filed invoices and credit/debit notes, ISD information and IGST import information from ICEGATE. A supplier’s late filing can cause an invoice to appear in a later GSTR-2B even when the invoice date is in an earlier month.
Classify a difference as a timing issue only after checking the supplier’s filing period and the cut-off. Do not treat every invoice absent from the current GSTR-2B as a permanently missing document, and do not claim that an invoice is available for the current period solely because it exists in your purchase register. Eligibility and tax treatment remain matters for the applicable GST rules and the taxpayer’s professional review.
8. Resolve exceptions and preserve the trail
For each unresolved row, attach the invoice or note, IRN evidence, relevant portal export, return-period decision and correction note. A reviewer should be able to start with the final GSTR-3B number and trace it back to the summary, GSTR-1 table, source document and—where applicable—IRP or GSTR-2B evidence.
Diagnose a difference using six comparison axes
When two reports disagree, test the dimensions in this order. This prevents a timing issue from being mislabelled as a tax-rate error and prevents an edited record from being mistaken for a missing IRP record.
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| Axis | Questions to ask | Evidence to retain |
|---|---|---|
| Document identity | Do number, date, recipient GSTIN, document type and IRN identify the same document? | Source invoice, IRP record and matching-key result. |
| Period and cut-off | Was the document dated, reported or filed in the period being compared? Did supplier filing occur before the GSTR-2B cut-off? | Document date, filing date, return period and GSTR-2B cut-off. |
| Status | Is the IRN valid, cancelled, absent or replaced? Was the GSTR-1 record edited or deleted? | IRN/status evidence, portal history where available and correction note. |
| Classification and table | Is the item B2B, export, reverse charge, credit/debit note or another category, and is it in the corresponding GSTR-1 table? | Tax invoice or note, tax treatment and table-level reconciliation. |
| Amount basis | Are you comparing line-level books with rate-level GSTR-1 aggregation? Do taxable value and tax agree after grouping? | Rate-wise ledger summary and return totals. |
| Source and provenance | Does the number come from books, IRP, final GSTR-1, GSTR-2B or system-generated GSTR-3B? Has anyone overwritten it? | Original download, final return export, generated PDF and override explanation. |
Exception handling: what to do when records do not match
An applicable invoice is missing from IRP data
- Confirm the invoice date, document type and whether the taxpayer was subject to e-invoicing for that transaction.
- Search for a spelling, numbering or recipient-GSTIN mismatch in the IRP export.
- Check whether an IRN was cancelled or whether a replacement document was issued.
- Check whether the corresponding GSTR-1 period was already filed and whether the invoice was entered manually.
- Do not generate a duplicate return row simply because the IRP search was inconclusive. Resolve the source document and IRN status first.
The IRP record exists but is absent from GSTR-1
Allow for the normal portal update window, then inspect the relevant GSTR-1 table and source fields. The IRP-authorized guidance says that data not auto-populated in GSTR-1 for the corresponding month should be manually entered by the registered person. Before doing so, search all relevant tables and confirm that the record is not already present under a different classification.
The GSTR-1 row was edited or deleted
The GSTN advisory states that editing or deleting an auto-populated GSTR-1 record clears the Source, IRN and IRN-date fields; the edited row is treated as separately uploaded. Preserve the original IRP record, the final edited row and the reason for the change. Because the IRP-side Excel file does not show later GSTR-1 edits, reconcile the final return export rather than relying on that Excel file alone.
An IRN is cancelled or a document is replaced
Mark the original document as an exception and confirm the current IRP and return status before filing. Trace any replacement invoice or note separately; never let a cancelled document and its replacement both contribute to the same outward-supply total unless the underlying tax treatment explicitly requires that result.
GSTR-2B does not contain a supplier invoice
Compare the supplier’s filing period and the GSTR-2B cut-off with the invoice date. Ask the supplier for filing evidence where appropriate and monitor the next statement. Keep the purchase-register entry, supplier document and GSTR-2B result distinct until the period in which the document is actually reported is established.
Totals differ only after grouping
Recalculate at tax-rate level and separate taxable value from tax. A line-level accounting report can contain several rates on one invoice, while the e-invoice feed aggregates item information at rate level. Recheck rounding, credit/debit-note signs and table classification before changing a valid source document.
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The portal’s provenance fields are useful controls. A Source value, IRN and IRN date show that a row came through the e-invoice flow. When a row is manually edited or deleted, those fields can be cleared. That does not automatically make the edited tax amount wrong, but it means the reviewer must rely on the invoice, correction explanation and final return evidence rather than treating the row as an untouched IRP feed.
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.” Apply that principle narrowly: correct an actual discrepancy, document why it was corrected and avoid changing a matching record merely to make a summary total look convenient.
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Download and file-management practices
Use a folder structure that separates the tax period and data source. For example, keep the books extract, IRP export, GSTR-1 final export, GSTR-2B, GSTR-3B PDF and exception log in one period folder, with the download date in each filename. Lock the original files and perform calculations in a working copy.
The GST Portal guide says Excel downloads containing fewer than 500 records are available immediately, while larger files may be prepared asynchronously. A delayed download is therefore not proof that records are missing. Wait for the portal-generated file, record when it was requested and compare its record count with the source population.
For high-volume periods, the GSTN advisory describes JSON download and API access through a GST Suvidha Provider. Whichever method you use, retain the raw response and the transformed spreadsheet so a later reviewer can distinguish portal data from calculations.
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Verify the dated e-invoice reporting rule before relying on it
An IRIS IRP production-release notice dated March 31, 2025 says 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. Because this is a time-sensitive operational rule, check the latest GSTN or authorized IRP advisory for the tax period before treating the 30-day limit as current for a particular taxpayer. The notice is available at IRIS IRP’s production-release advisory.
For general applicability questions, consult the current IRIS IRP e-invoicing mandate information together with current GSTN notifications. Neither a historical turnover figure nor a prior-month workflow is enough to establish that every document in the present period required an IRN.
Pre-filing review checklist
- The return period, download dates and relevant GSTR-2B cut-off are recorded.
- All issued invoices, debit notes and credit notes are in the source population, including documents not subject to e-invoicing.
- Every applicable e-invoice has been matched by document identity, amount and IRN/status.
- IRP records have been checked in the correct GSTR-1 tables and at the rate-level aggregation used by the portal.
- Non-e-invoice outward supplies have been entered in the appropriate GSTR-1 tables.
- Late, cancelled, missing, duplicate and manually edited records have an exception status and evidence.
- The final GSTR-1 export, rather than only an IRP Excel file, has been used for the supplier-side comparison.
- The system-generated GSTR-3B PDF has been reviewed, and each edited tile has a documented reason.
- Recipient-side GSTR-2B differences have been classified by supplier filing period and cut-off before any credit decision.
- The final totals agree to the underlying documents or have a written, reviewable explanation.
What a defensible reconciliation looks like
A defensible reconciliation does not force all three forms to show the same raw number. It explains the bridge: which book documents were required to be e-invoices, which IRNs were valid or cancelled, which records populated GSTR-1, which non-e-invoice supplies were added, how rate-level aggregation was calculated, why GSTR-3B was edited if necessary and when supplier filings caused documents to appear in GSTR-2B.
Finish by reviewing the applicable GST rules and the current portal guidance for the tax period. If classification, reverse-charge treatment, cancellation, filing period or input-tax-credit eligibility is disputed, obtain advice from a qualified GST professional before filing rather than resolving the difference by an unsupported manual adjustment.
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