Why does GSTR-1 tax liability differ from GSTR-3B in Tally Prime?

Mismatches happen due to 4 common reasons: 1. Unresolved 'Uncertain Transactions' in GSTR-1 report. 2. Manual CGST/SGST vs IGST ledger selection errors. 3. Backdated voucher edits after GSTR-1 filing. 4. Unadjusted credit notes.

What is Form DRC-01B and what happens if I ignore it?

Form DRC-01B is an automated Rule 88C notice issued when GSTR-1 tax liability exceeds GSTR-3B payment by a specified threshold. If ignored for 7 days, the portal blocks GSTR-1/IFF filing for the next period and initiates recovery under Section 79.

How can TrulyInvoice AI prevent GST reconciliation errors?

TrulyInvoice AI auto-extracts line items, HSN rates, and tax figures from vendor PDFs, posting verified F9 Purchase Vouchers directly into Tally Prime via Port 9000 local sync in 15 seconds.

How to Fix Mismatch Between GSTR-1 and GSTR-3B in Tally (2026)

Q: How do I fix Uncertain Transactions in Tally Prime GSTR-1 report?

Go to Gateway of Tally > Display > Statutory Reports > GST Reports > GSTR-1. Drill down into 'Uncertain Transactions (Corrections needed)', fix missing GSTINs or tax ledgers, and save the vouchers.

Quick Summary: How Do I Fix a GSTR-1 and GSTR-3B Mismatch in Tally Prime?

In Tally Prime, go to Gateway of Tally > Display More Reports > GST Reports > GSTR-1 & GSTR-3B. Drill down into 'Uncertain Transactions (Corrections needed)', fix party GSTINs or tax ledger mismatches, and re-export returns. To respond to a Form DRC-01B portal notice, pay the tax via DRC-03 or submit Part B justification within 7 days.

Rule 88C Notice: Form DRC-01B is issued if GSTR-1 sales liability exceeds GSTR-3B tax paid.
7-Day Reply Deadline: Must respond via Form DRC-03 or Part B explanation within 7 days.
Uncertain Transactions: Clearing exceptions in Tally lowers GSTR-1 vs 3B discrepancy to zero.
DRC-01C Penalty Prevention: Resolving purchase errors prevents ITC recovery proceedings.

1. Why Mismatches Occur Between GSTR-1 and GSTR-3B in Tally

Under GST law, GSTR-1 is a statement of outward sales supplies, while GSTR-3B is the monthly tax payment summary. Tax liability reported in GSTR-1 should match the tax paid in GSTR-3B Table 3.1.

In Tally Prime, discrepancies arise primarily due to four operational issues:

Uncertain Transactions: Vouchers with missing GSTINs, incorrect HSN codes, or unmapped UQCs are excluded from GSTR-1 export files.
Tax Ledger Swaps: Selecting IGST instead of CGST/SGST for intra-state sales (or vice-versa).
Backdated Voucher Edits: Editing sales vouchers after GSTR-1 has already been exported and filed on the GST portal.
Unadjusted Credit/Debit Notes: Entering sales returns without linking original invoice reference details in Tally.

2. Step-by-Step SOP to Resolve Mismatches in Tally Prime

Step 1: Open GSTR-1 & GSTR-3B Reports

Press Alt+G and type GSTR-1. Note the total tax liability figure under Total Taxable Amount and Total Tax Amount. Then open GSTR-3B and compare Table 3.1 liability.

Step 2: Clear Uncertain Transactions

Drill down into Uncertain Transactions (Corrections needed). Select transactions with errors (e.g. Tax head mismatch or Information mismatch in voucher), make the required ledger corrections, and save.

Step 3: Update Section 7 & Set Status

If place of supply differs, select the voucher and press Alt+S (Update Section 7 / Set GST Status) to re-categorize the transaction as Inter-State or Intra-State.

3. How to Respond to Form DRC-01B Portal Notices (Rule 88C)

If your GSTR-1 sales liability exceeds GSTR-3B payment beyond the system threshold, the GST portal issues an automated Form DRC-01B (Part A) intimation notice. You have 7 calendar days to take action:

Option A: Pay Shortfall via DRC-03

If tax was genuinely underpaid, deposit the tax plus Section 50 interest via Form DRC-03. Enter the DRC-03 ARN in Part B of DRC-01B on the GST portal.

Option B: Submit Part B Justification

If the discrepancy is due to a reporting error or credit note timing, navigate to Services > Returns > Return Compliance > Liability Mismatch (DRC-01B) and submit Part B explaining the reason.

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Data entry mistakes in vendor bills (wrong tax ledgers or miscalculated GST amounts) create mismatches between purchase registers and GST returns.

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