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To reconcile Indian GST returns, match your sales invoices and credit/debit notes to GSTR-1, compare the resulting outward tax liability with GSTR-3B and tax paid, and match purchase invoices to GSTR-2B before checking the input tax credit (ITC) claimed in GSTR-3B. Keep the same GSTIN and tax period on both sides of each comparison: a late supplier filing, amended document, or reporting error can require a different fix.
Which records and returns should you compare?
Reconciliation is not one comparison. Check outward invoice reporting, outward tax liability, and purchase-side ITC separately. Use the same GSTIN and return period for each comparison, and trace a difference to its source record before changing a filed return.
| Check | Compare | What it helps identify |
|---|---|---|
| Sales and other outward supplies | Your invoice and credit/debit note register against GSTR-1 | Missing, duplicated, incorrectly reported, or amended outward records. GSTR-1 contains invoice-level details for registered buyers and specified categories, as well as amendments and summarized supply details. GST Portal GSTR-1 FAQ |
| Outward tax liability | Liability reported in GSTR-1 against GSTR-3B and tax paid | A difference in reported liability or payment. Some GSTR-1/IFF and GSTR-3B/3BQ differences may generate a DRC-01B intimation. GST Portal DRC-01B guidance |
| Purchase documents | Purchase invoices against GSTR-2B | Whether supplier-filed documents are reflected in the statement for the period you are checking. GSTR-2B depends on filed supplier documents and other specified inputs. GST Portal GSTR-2B FAQ |
| ITC claimed | Eligible ITC supported by your records and GSTR-2B against ITC claimed in GSTR-3B | Whether the claim differs from the available statement data; availability in GSTR-2B and the amount claimed in GSTR-3B are related but distinct checks. GST Portal DRC-01C guidance |
How to check a mismatch systematically
Use the following as a practical matching sequence. It is a workflow inferred from the records and portal procedures, not a formally prescribed GST Portal checklist.
- Align identity and period. Confirm the GSTIN and tax period for the invoice register, return, and statement you are comparing.
- Match document details. Check invoice number and date, supplier or recipient GSTIN, taxable value, tax rate and amount, place of supply, and supply category.
- Check notes and amendments. Match credit and debit notes, and establish whether a portal record is original or amended.
- Reconcile outward liability. Compare the GSTR-1 summary and resulting liability with GSTR-3B and the tax paid for the period.
- Investigate purchase-side gaps. If an invoice is absent from GSTR-2B, check whether and when the supplier filed it, then inspect the relevant statement period before concluding that ITC is missing or wrongly claimed.
Why might a purchase invoice be missing from GSTR-2B?
The invoice date alone does not determine which GSTR-2B contains a supplier document. The statement reflects supplier-filed documents according to filing windows, so a supplier who files later may cause a document to appear in a later statement than the period suggested by its issue date. The GST Portal’s examples illustrate that timing relationship; check the actual supplier filing and the relevant statement rather than treating absence from one period as proof that the invoice was never reported. GST Portal GSTR-2B FAQ
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How do you correct an error in GSTR-1?
Before filing the statement
For a draft GSTR-1, the portal guidance says uploaded invoice details can be modified or deleted before filing. Add or amend the records, generate the summary, inspect it, and then file. The portal guide also says e-invoice details update into GSTR-1 within a period of two days; allow for that workflow timing when checking imported data. GST Portal GSTR-1 preparation guide
After filing, before GSTR-3B for the same period
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 can 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. GST Portal GSTR-1 FAQ
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For an earlier-period invoice or note
The GSTR-1 workflow includes amendment tables for earlier-period invoices and notes. Use the table appropriate to the type of record; the portal guide says that, for a relevant amended invoice, only the differential liability is payable in the current tax period. The GSTR-1 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, return period, any extension notification, and record type before relying on that date. GST Portal GSTR-1 FAQ
What if GSTR-1 and GSTR-3B liability do not match?
First determine whether the difference comes from a missing or incorrect outward record, a note or amendment, or a discrepancy in the liability or payment reported in GSTR-3B. If the portal issues DRC-01B, provide the reconciliation in Part B through the portal. The GST Portal guidance says that failing to file the response can prevent filing GSTR-1/IFF for a subsequent tax period. The numerical threshold for an intimation is not established here, so do not assume a particular amount or percentage; check the current portal guidance and notice for the applicable period. GST Portal DRC-01B guidance
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What if GSTR-2B and ITC claimed in GSTR-3B differ?
Check whether the difference reflects supplier filing timing, a document or period mismatch, or an ITC claim that does not align with the statement. The GST Portal identifies DRC-01C as the process for an ITC difference between GSTR-2B availability and ITC claimed in GSTR-3B, with a Part B response. Consult the notice and current portal instructions for the response required in your case. GST Portal DRC-01C guidance
Using accounting or return-preparation software
Software can help import invoices and compare records, but it does not replace checking the GST Portal data or selecting the correct correction route. The portal recognizes third-party ASP applications through GSPs as one way to prepare GSTR-1. Before relying on a tool, assess whether it supports the return types and periods you use, matches invoice fields and notes, handles amendments, produces reconciliation exports and an audit trail, and has suitable security, access controls, and support. Confirm current features and total cost directly with the provider; no particular vendor’s capabilities or pricing are established here.
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Official guidance and period-specific rules
Portal procedures and statutory deadlines can change. The cited GST Portal pages were reviewed on 4 October 2026; verify the rule and workflow applicable to your return period before filing or advising.
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