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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallTo fix a GST return mismatch, first identify which records differ and for which GSTIN and tax period. A GSTR-1 versus GSTR-3B liability discrepancy, an input tax credit (ITC) discrepancy, a wrong or missing GSTR-1 entry, and a portal upload error each have different remedies. Reconcile the underlying invoices before changing figures or paying tax, then use the correction or compliance route that fits the return’s filing status.
This guide covers Indian GST returns. Portal steps and deadlines can change; verify the live return tile and period-specific notifications before filing.
Identify the kind of mismatch before changing a return
Start with the GSTIN, tax period, and the two records that do not agree. Keep outward tax liability and recipient ITC separate: the portal uses different compliance paths for those discrepancies.
| What differs | What to compare | Likely route |
|---|---|---|
| GSTR-1 and GSTR-3B outward liability | Supplies and tax reported in GSTR-1 against liability reported or discharged in GSTR-3B | Reconcile the returns; if the portal issues an intimation, follow DRC-01B. |
| ITC discrepancy | Your purchase records and ITC claim against the supplier-reported statement and your return position | Check the underlying records and GSTR-2B; if intimated, follow DRC-01C. |
| Wrong or missing GSTR-1 entry | Filed invoice data against books and source invoices | Consider same-period GSTR-1A if available, or the applicable later-return amendment route. |
| Portal validation or upload error | Table totals, required fields, uploaded data, and error report | Correct the data or upload; do not assume the tax calculation itself is wrong. |
| Return tile blocked | Required returns for earlier periods and the same period | Check filing dependencies before treating the block as a new mismatch. |
The portal describes the GSTR-1 and GSTR-3B liability process in its DRC-01B FAQ and the ITC process in its DRC-01C FAQ.
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Reconcile the records and portal data
Match invoice details to your books
For each affected invoice, credit note, debit note, or amendment, compare the invoice number and date, recipient GSTIN, place of supply where relevant, taxable value, tax rate, and tax amounts. Check the filed return data against the source documents rather than adjusting a summary total to make two returns agree.
The portal’s GSTR-1 guidance describes invoice-level reporting and filing dependencies. Its GSTR-1 creation manual explains table-level validations.
Check GSTR-1 totals, required fields, and uploads
If GSTR-1 shows a table warning, compare the taxable values and tax amounts in Table 12 with the related supply tables. The portal warns when totals do not align; some combinations of populated tables also make Table 13 mandatory. Treat a warning as a prompt to trace the underlying entries, not as a reason to alter a total without support.
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If an offline upload produces an error report, download it and correct the listed records. The portal’s known-issues guidance says the GSTR-1 “Data mismatch” error can arise when no data or incomplete data was uploaded and advises uploading complete data. The GSTR-1 guidance also notes that duplicate supply invoices are not accepted and recommends checking recipient GSTIN validity.
Correct a GSTR-1 entry when the return status allows it
Use GSTR-1A before filing that period’s GSTR-3B
GSTR-1A is an optional facility available once for a tax period. After GSTR-1 is filed, or after its due date if later, it can be used to amend records already reported or add omitted records, provided GSTR-3B for that same period has not been filed. Changes made through GSTR-1A are auto-populated into the supplier’s GSTR-3B for that period.
For the recipient, supplies declared or amended through the supplier’s GSTR-1A appear as ITC in the next tax period’s GSTR-2B, not the same period’s GSTR-2B. That timing can account for a difference between a supplier correction and the recipient’s current-period statement. See the portal’s GSTR-1 and GSTR-1A guidance.
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If GSTR-3B is already filed
Do not assume GSTR-1A can revise a filed GSTR-3B. For corrections outside the same-period GSTR-1A window, check the applicable subsequent-return amendment rules and cutoff. The portal states that additions or amendments to previous-financial-year GSTR-1 invoices are not allowed after 30 November of the following financial year; verify the rule and any applicable notification for the period. The CBIC sectoral FAQs also address amendments.
Respond to DRC-01B or DRC-01C intimations carefully
DRC-01B for a GSTR-1 and GSTR-3B liability difference
The portal FAQ describes DRC-01B intimations for monthly filers after monthly GSTR-3B and for QRMP filers after quarterly GSTR-3B, as applicable. To reach the response, use Services > Returns > Return Compliance > Liability Mismatch DRC-01B.
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Read the intimation and reconcile its period and amount against the filed returns and books before deciding whether a correction or payment is appropriate. A difference alone does not establish that payment is due. If you use DRC-03 payment details in the response, the portal FAQ says the ARN must match the same GSTIN and relevant period, the DRC-03 must have been filed on or after DRC-01B Part A, and the payment cause must be “Liability mismatch – GSTR-1 to GSTR-3B.”
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After filing Part B, the FAQ says GSTR-1/IFF can be filed instantly. If the filing screen still appears blocked, it suggests logging out and back in after a few minutes. Follow the actual portal status and intimation for your case.
DRC-01C for an ITC difference
DRC-01C concerns an ITC mismatch; it is not the same process as DRC-01B. The portal FAQ explains that Part B is filed monthly or quarterly according to the GSTR-3B filing frequency. If responding with a DRC-03 ARN, check the same GSTIN, relevant intimation and period, issuance timing, and payment cause against the DRC-01C FAQ.
The existence of a mismatch does not by itself determine whether a particular amount should be claimed, reversed, or paid. Review the source records, applicable law, and the actual intimation before responding.
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Check filing dependencies and deadlines before retrying
A blocked return tile may reflect an unmet filing prerequisite rather than a new error in the current return. The portal describes dependencies involving prior GSTR-1 and GSTR-3B periods, and generally requires the same period’s GSTR-1 to be filed before its GSTR-3B. Check the relevant period and filing frequency in the portal’s GSTR-1 guidance.
The portal guidance gives the general GSTR-1 due date as the 11th day of the succeeding month for monthly filers and the 13th day of the month following the quarter for quarterly filers, unless the Government extends the date by notification. Confirm the live period tile and applicable notification rather than relying on a general date.
Keep a record of the resolution
For your own follow-up and accounting records, retain the reconciliation workings, source invoices and notes, filed return copies, portal notices, upload error reports, any DRC-03 ARN, and the final acknowledgement or ARN. The portal guidance explains filing and response mechanics; this is a practical recordkeeping checklist, not a universal evidence list prescribed by those pages.
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