GSTR-3B Reset Advisory and GSTR-1 HSN Auto-Population: What Changed

GSTN has issued two separate advisories affecting GST return filing: one on resetting and re-filing GSTR-3B for taxpayers with data discrepancies, and another on auto-populating the HSN-wise summary in Table 12 of GSTR-1 from e-invoices. The GSTR-3B reset was a one-time correction facility for specifically notified taxpayers in April 2024 and is now closed. The GSTR-1 HSN auto-population feature, by contrast, has continued to evolve HSN reporting in Table 12 is now mandatory, entered only via dropdown, and split across separate B2B and B2C tabs.

GSTR-3B Reset and Re-Filing Advisory (April 2024)

On 9th April 2024, GSTN issued an advisory enabling certain taxpayers to reset and re-file GSTR-3B returns after discrepancies were found between data saved in the GST system and data actually filed specifically in ITC availment and tax liability payment fields.

What happened, and to whom:

• The GST Council’s Grievance Redressal Committee reviewed the issue and, as a facilitation measure, decided to reset the affected returns to give those taxpayers a chance to correct the discrepancy.
• Only taxpayers identified by GSTN as affected were notified individually by email; the relevant returns appeared on their GST dashboard for re-filing.
• Affected taxpayers had 15 days from notification to re-file with correct data.
• Difficulties during re-filing could be escalated to the jurisdictional tax officer or via a GST grievance redressal ticket.

Current status:

This was a one-time facility limited to taxpayers GSTN specifically notified in 2024, not a standing or repeatable process. If you weren’t contacted at the time, this facility does not apply to your filings, and the 15-day window for those who were notified has long since closed. We’re keeping this section as a reference record useful if you’re verifying your own filing history from that period or if a similar reset facility is reopened in the future, since the mechanics would likely be similar.

Official advisory: GST Portal: Advisory on Reset and Re-filing of GSTR-3B

GSTR-1 HSN Auto-Population in Table 12: What’s Changed Since 2024

GSTN first enabled auto-population of HSN-wise summary data from e-invoices into Table 12 of GSTR-1 in 2024, pulling HSN codes, descriptions, and values directly from e-invoice data to reduce manual entry. Since then, the table has changed substantially twice.

What the original 2024 feature did:

• Table 12 summarizes outward supplies by HSN code.
• The GST system automatically pulled HSN-wise data from e-invoices generated during the filing period.
• Auto-populated data still required review and reconciliation against actual records before final submission; manual corrections were possible if discrepancies were found.

What’s changed since (current as of FY 2026-27):

• Manual HSN entry discontinued. Since the GSTN advisory dated 22nd January 2025 (Phase 3 of the HSN reporting rollout), HSN codes can no longer be typed in directly; they must be selected from a portal dropdown, which then auto-populates the matching description.
• Table 12 split into two tabs. From the May 2025 return period, Table 12 divides into 12A (B2B supplies) and 12B (B2C supplies), reported separately.
• Reporting digit length is turnover-based. Businesses with aggregate annual turnover up to ₹5 crore report 4-digit HSN codes; above ₹5 crore, 6-digit codes are required.
• HSN and document reporting are now mandatory, not advisory. Table 12 (HSN Summary) and Table 13 (Document Summary) moved from warning-only validation to mandatory fields; incomplete entries now trigger filing errors rather than warnings.
• GSTR-3B values are now hard-locked from GSTR-1 data. This tightens the consequence of getting Table 12 wrong: errors no longer stay contained to GSTR-1 they flow directly into your GSTR-3B liability and can affect your buyers’ ITC through GSTR-2B.

Practical implication:

If your filing process still treats Table 12 as a soft, auto-filled convenience feature from 2024, it’s worth a process check. The mandatory validation and B2B/B2C split mean Table 12 now needs the same level of pre-filing review as your other GSTR-1 tables.

Official advisory: GST Portal: Advisory on Auto-Population of e-Invoice Details into GSTR-1

How These Two Advisories Relate to Your GST Filing Workflow

Both advisories sit inside the same broader shift: GSTN is steadily reducing manual entry points and increasing automated cross-validation between GSTR-1 and GSTR-3B. The reset advisory addressed a one-time discrepancy between saved and filed data; the HSN auto-population changes address ongoing accuracy in outward-supply reporting. Together, they’re part of why reconciliation discipline between GSTR-1, GSTR-2B, and GSTR-3B matters more with each filing cycle not less. For ITC-side reconciliation specifically, see our guide on GST input tax credit rules and ITC claiming strategies, which covers the GSTR-2B matching requirements this page doesn’t repeat.

How MBG Supports GST Return Filing Accuracy

Keeping pace with GSTN’s phased changes to GSTR-1 and GSTR-3B validation rules takes ongoing process discipline, not a one-time fix. MBG’s GST Advisory and Compliance team helps businesses build the reconciliation and review steps these changes now require — from HSN classification accuracy to GSTR-1/GSTR-3B data consistency. To review your current filing process, connect with our GST advisory team.

Additional Resources

• GST Input Tax Credit Rules and ITC Claiming Strategies for Businesses
• Invoice Management System in GST
• Impact of GST Compliance Quality on Working Capital Efficiency
• RCM Liability/ITC Statement: A Complete GST Compliance Guide