GST Return Filing Checklist 2026 — GSTR-1, GSTR-3B & Annual Return
Filing GST returns accurately and on time is critical to avoid penalties of ₹50–₹200 per day and maintain a clean GST compliance record for future tenders, loans, and audits. This checklist covers everything you need for monthly/quarterly GSTR-1, GSTR-3B, and the annual GSTR-9 return.
Before Filing — Gather This Data
- ✅GST number (GSTIN) and password for the GST portal
- ✅All sales invoices for the period (with GSTIN of buyers where applicable)
- ✅All purchase invoices — supplier GSTIN, invoice number, date, taxable value, GST amount
- ✅Credit notes and debit notes issued/received during the period
- ✅Advance receipts for services (taxable in GSTR-3B)
- ✅Bank statement to reconcile TDS/TCS under GST
- ✅Electronic Cash Ledger balance (to check available cash for payment)
- ✅Electronic Credit Ledger (IGST, CGST, SGST ITC balance)
GSTR-1 — Outward Supplies (Monthly / Quarterly)
- ✅B2B invoices — with buyer GSTIN, invoice wise details
- ✅B2C large invoices — individual invoice above ₹2.5 lakh
- ✅B2C small invoices — state-wise aggregated (below ₹2.5 lakh)
- ✅Export invoices — with/without payment of tax (LUT/bond details)
- ✅Credit notes, debit notes, and amendments to past invoices
- ✅HSN-wise summary of outward supplies
- ✅Due date: 11th of the following month (monthly) | 13th of month after quarter (quarterly)
GSTR-3B — Summary Return (Monthly / Quarterly)
- ✅Total taxable outward supplies and GST liability
- ✅Total Input Tax Credit (ITC) claimed — IGST, CGST, SGST separately
- ✅Inward supplies liable to reverse charge
- ✅Net tax payable after ITC set-off
- ✅Payment of tax — via Electronic Cash Ledger
- ✅Due date: 20th of the following month
GSTR-9 — Annual Return
- ✅Consolidated summary of all outward and inward supplies for the year
- ✅ITC availed vs ITC reversed reconciliation
- ✅Tax paid during the year (split by month)
- ✅Details of demands and refunds
- ✅HSN-wise summary of inward and outward supplies
- ✅Due date: 31st December of the following financial year
Pro Tips
💡 Reconcile GSTR-2A before filing ITC
Always match your purchase invoices with GSTR-2A (auto-populated from supplier filings) before claiming ITC in GSTR-3B. ITC claimed in excess of GSTR-2A is subject to recovery with interest.
💡 File GSTR-1 before GSTR-3B
GSTR-3B liability is calculated based on GSTR-1 data. Always file GSTR-1 first each period to maintain consistency.
💡 Late fees are ₹50/day for GST
Late filing of GSTR-3B attracts ₹50/day (₹25 CGST + ₹25 SGST) for regular taxpayers and ₹20/day for NIL return filers. File on time to avoid accumulating penalties.
Frequently Asked Questions
What happens if I file GSTR-3B but not GSTR-1?
Filing GSTR-3B without GSTR-1 means your buyers cannot see your invoices in their GSTR-2A, blocking their ITC claims. This may affect business relationships and lead to disputes. Always file GSTR-1 on time.
Can I revise a GST return after filing?
GST returns cannot be revised once filed. Corrections are made through amendments in the subsequent period's GSTR-1 or through credit notes/debit notes.