GST Reconciliation — GSTR-1 vs GSTR-3B Mismatch and Notices

GST reconciliation is the process of matching and resolving differences between various GST returns filed by the taxpayer. The GSTN system compares data across returns and flags mismatches — which can lead to demand notices, interest and penalties. Understanding reconciliation is essential for every GST-registered business. Here is the complete guide.

Key GST Reconciliation Types

1. GSTR-1 vs GSTR-3B — Outward Supply Reconciliation

• GSTR-1 reports: Detailed invoice-level outward supply data (sales)
• GSTR-3B reports: Summary of outward supplies and tax paid
• GSTN compares these automatically — if GSTR-1 shows higher turnover/tax than GSTR-3B, a demand is raised
• Common causes of mismatch: Forgot to include invoices in GSTR-3B; incorrect rate applied in GSTR-3B; GSTR-1 amendments not reflected in GSTR-3B

2. GSTR-2B vs Purchase Register — ITC Reconciliation

• GSTR-2B (auto-populated from suppliers' GSTR-1) shows ITC available
• Compare with the business's purchase register — identify invoices in purchase register but not in GSTR-2B (supplier not filed GSTR-1)
• ITC claimed in GSTR-3B cannot exceed 105% of GSTR-2B (now 100% from November 2021)
• Excess ITC claimed → reversed by GSTN with 18% interest and demand under DRC-07

3. GSTR-9 vs GSTR-3B — Annual Reconciliation

• GSTR-9 (Annual Return) reports the annual figures — which must match with the sum of monthly GSTR-3B data for the year
• Differences must be disclosed in GSTR-9C (audit reconciliation) and tax paid in DRC-03

GST Notices for Mismatch

• DRC-01: Notice for short payment of tax — issued when GSTR-1 shows higher tax than GSTR-3B (SCN — Show Cause Notice)
• DRC-01A: Intimation to pay before SCN — less formal, taxpayer can pay to avoid SCN
• Response must be filed within 30 days — with explanation or payment of difference + interest

How to Rectify Mismatches

• For GSTR-1 errors: File GSTR-1A (amendment return) to correct the data
• For GSTR-3B under-payment: Pay the differential tax via DRC-03 (voluntary payment)
• For ITC excess claim: Reverse ITC in subsequent GSTR-3B and pay interest
• For supplier non-filing: Follow up with supplier to file their GSTR-1; ITC is blocked until they file

Conclusion

GST reconciliation — both monthly (GSTR-1 vs GSTR-3B) and annual (GSTR-9) — is essential for preventing tax notices and protecting ITC claims. SPOTON provides complete GST reconciliation services, DRC-01 response and GSTR-9/9C filing for businesses across Kerala. Contact us for expert GST compliance services.