Finance/Compliance Consultant
71046 Points
Posted on 06 November 2026
The tax is paid, so only interest is the issue:
• GSTR-3B can't be revised once filed. Table 6.1's period-wise breakup only helps the system compute interest on tax relating to earlier periods. Not filling it means the auto-calculated interest was not levied, but the liability for interest still exists.
• Interest under Sec 50(1): 18% a year on the tax for each missed invoice, from the due date of the original month's GSTR-3B to the date of payment in March 2025. Since you paid in cash or credit in March, compute interest invoice-wise for the delay period.
• Pay the interest voluntarily through DRC-03 ("voluntary payment – interest"), choosing the relevant periods. Keep the computation.
• Penalty: none for a voluntary, self-detected delay paid with interest before any notice (Sec 73(5)/(6)).
• Interest is payable only on the cash portion, if ITC was available in the ledger throughout (Rule 88B(1) for delayed returns). For missed invoices in a later return, interest is on the net tax liability paid in cash for that delayed tax.
• Prevention: reconcile books vs GSTR-1 vs e-invoice/e-way bill monthly. Missed B2B invoices also affect the buyer's ITC timing.