Reconcile GST records in three separate checks: match sales invoices and notes to GSTR-1, compare outward tax liability in GSTR-1 with GSTR-3B and tax paid, then match purchase invoices to GSTR-2B and the input tax credit (ITC) claimed in GSTR-3B. Keep the GSTIN and tax period aligned in each comparison. The right correction depends on whether the return is still a draft, the same-period GSTR-3B is yet to be filed, or the error belongs to an earlier period.
Which GST records should you reconcile?
Start by identifying what does not match. GSTR-1 is the outward-supplies statement; GSTR-2B is the ITC statement based on supplier-filed documents and other specified inputs; GSTR-3B is where you report liability and claim eligible ITC. These comparisons answer different questions, so a mismatch in one does not automatically establish an error in another.
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- Sales reporting: Compare issued sales invoices and credit or debit notes with GSTR-1 for the same GSTIN and tax period. GSTR-1 includes invoice-level details for registered buyers and specified categories, amendments, and summarized supply details. See the GST Portal GSTR-1 FAQ and GSTR-1 user guide.
- Outward tax liability: Compare the liability arising from outward supplies reported in GSTR-1 with the liability in GSTR-3B and the tax paid. The GST Portal says a difference beyond its predefined limit may generate a DRC-01B intimation; the applicable threshold is not stated in the available official guidance cited here. See the DRC-01B guidance.
- Purchases and ITC: Compare purchase invoices with GSTR-2B, then check whether the ITC claimed in GSTR-3B is eligible and consistent with the available statement. A supplier’s filing date can affect which GSTR-2B contains a document. See the GST Portal GSTR-2B FAQ.
How to find the source of a mismatch
Use the same GSTIN and period on both sides of a comparison. Then trace any difference back to the invoice, note, supplier filing, or return entry before changing a filed record. This checklist is a practical way to investigate; it is not a prescribed GST Portal checklist.
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- Compare taxable value, tax rate and amount, place of supply, and supply category.
- Check credit and debit notes, and confirm whether each record is original or amended.
- Reconcile the GSTR-1 summary and outward tax liability with GSTR-3B and tax paid.
- For a purchase document absent from GSTR-2B, check whether the supplier filed it and whether it appears in an appropriate later statement before concluding that ITC is missing or incorrectly claimed.
Common causes include an omitted invoice, an incorrect invoice field, an amendment, a credit or debit note, or a supplier filing after the period you first checked. The underlying records and portal data determine which correction route applies.
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Why an invoice may be missing from GSTR-2B
GSTR-2B reflects supplier-filed documents according to filing windows, so the invoice date alone does not determine the monthly statement in which a document appears. The GST Portal FAQ illustrates documents appearing in a later GSTR-2B based on when the supplier filed, regardless of the document’s issue date. Its examples are historical workflow illustrations, not a current filing calendar. Check the supplier’s filing and the appropriate GSTR-2B period before treating the absence as an ITC error.
Keep three facts distinct: whether a supplier document is reflected in GSTR-2B, whether ITC is eligible, and whether the amount claimed in GSTR-3B is correct. If you receive an ITC-mismatch intimation, the GST Portal identifies DRC-01C as the process for a difference between GSTR-2B ITC availability and ITC claimed in GSTR-3B, with a Part B response. The detailed process is not established by the cited FAQ listing; consult the current portal guidance for your case. See the DRC-01C guidance.
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How to correct a wrong or missing GSTR-1 entry
Before filing GSTR-1
While the return is still a draft, the GST Portal says uploaded invoice details can be modified or deleted. Add or amend the records, generate the summary, inspect it, and then file the statement. The portal guide also says e-invoice details update into GSTR-1 within a period of two days. See the GSTR-1 user guide.
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After filing GSTR-1, before filing same-period GSTR-3B
GSTR-1A is an optional facility to add missed records or amend records for the same tax period. The GST Portal FAQ says it becomes available after GSTR-1 is filed or its due date, whichever is later, and may be furnished before GSTR-3B for that period is filed. Changes flow into the taxpayer’s GSTR-3B. For recipients, records added or amended through GSTR-1A are reflected in the next tax period’s GSTR-2B. See the GSTR-1 FAQ.
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For an earlier-period error
The GSTR-1 workflow includes amendment tables for earlier-period invoices and notes. For a relevant amended invoice, the portal says only the differential liability is payable in the current tax period; the correct amendment table depends on the record type. The FAQ states a previous-financial-year cutoff of 30 November of the following financial year, but its page includes historic examples. Verify the statutory provision, relevant period, any extension notifications, and record type before relying on that date. See the GSTR-1 FAQ and GSTR-1 user guide.
What to do when GSTR-1 and GSTR-3B liability differ
First confirm that the periods match and that the difference is not explained by an amendment, a note, or an omitted or misclassified supply. Compare the resulting outward liability with the GSTR-3B liability and tax paid. A portal-generated DRC-01B is an outward-liability mismatch intimation, not a substitute for tracing the underlying figures.
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The GST Portal’s DRC-01B guidance says to submit the reconciliation in Part B through the portal. It also states that failure to file the response can prevent filing GSTR-1 or IFF for a subsequent tax period. Follow the current portal notice and applicable rules for the response. The cited guidance does not establish a numerical threshold, so do not infer one from this article. See the DRC-01B guidance.
When software may help
Accounting or return-preparation software can assist with importing invoices and comparing records, but it does not determine whether an item is legally eligible for ITC or which correction is valid for a particular period. The GST Portal recognizes preparation through third-party ASP applications via GSPs as one option. If evaluating a tool, check supported return types and periods, invoice-matching fields, handling of notes and amendments, reconciliation exports and audit trail, the portal or GSP/ASP workflow, security and access controls, support, and current total price. Features and pricing vary by provider; no particular vendor is assessed here.
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