How to File GST Returns (GSTR-1 and GSTR-3B): A Practical Guide
Most regular GST taxpayers file two main returns: GSTR-1, which reports outward supplies invoice by invoice, and GSTR-3B, a summary return through which tax is paid. Filing them accurately and on time keeps input tax credit flowing to your customers and protects you from interest, late fees and notices.
Documents and information you will need
- Sales register with invoice-wise details, credit notes and debit notes
- Purchase register and GSTR-2B for the period
- Details of advances, exports, SEZ supplies and reverse charge transactions
- Electronic cash and credit ledger balances
Step-by-step process
- Close and reconcile your books for the period. Record all sales, purchases, credit and debit notes. Reconcile sales with e-invoices and e-way bills where applicable.
- Prepare GSTR-1. Report B2B invoices with customer GSTINs, B2C supplies, exports, credit and debit notes, advances and amendments in the relevant tables. Upload through the portal or the offline tool, or through the IFF facility if you are a quarterly filer.
- File GSTR-1 by its due date. Review the summary, then file with DSC or EVC. Your customers see these invoices in their GSTR-2B, so delays affect their credit.
- Reconcile input tax credit with GSTR-2B. Match your purchase register with GSTR-2B. Claim only eligible credit reflected in GSTR-2B and follow up with suppliers on missing invoices.
- Prepare GSTR-3B. Enter outward supply totals (which should agree with GSTR-1), eligible ITC, reversals, reverse charge liability and interest if any. Check the auto-populated figures carefully.
- Pay tax and file GSTR-3B. Offset liability using ITC and pay the balance in cash through a challan, then file the return with DSC or EVC.
- Keep reconciliation workpapers. Retain monthly reconciliations of GSTR-1, GSTR-3B, GSTR-2B and books. They are your best defence against scrutiny notices.
Frequently asked questions
What happens if I file late?
Late fees and interest apply, and continued non-filing can block e-way bill generation and lead to cancellation of registration.
Can I revise a filed GSTR-3B?
GSTR-3B cannot be revised once filed; corrections are generally made in later returns within the time allowed by law.
Who can file quarterly?
Eligible small taxpayers can opt for the Quarterly Return Monthly Payment (QRMP) scheme, filing returns quarterly while paying tax monthly.
Start with a free consultation, or a no-risk pilot.
Tell us what you need. We reply within one working day, and sign an NDA before you share anything sensitive.