GSTR-3B
Summary return of sales, purchases & tax liability (self-declared).
Due
20th of the following month
FREQUENCY
Monthly
LATE FEE
Interest + ₹200/day late fee per return
IMPACT
ITC availability & cashflow
Step-by-step filing
- Compute total outward and inward supplies.
- Compute ITC admissible after reconciliation.
- Self-assess tax liability and pay via challan.
- File GSTR-3B on the portal before due date.
This is a summary return used to pay tax; its correctness affects cashflow and penalties.
Common pitfalls & how to avoid them
- Mismatch between supplier invoices and your purchase register — reconcile monthly.
- Wrong GSTIN/HSN entries — use validated exports to reduce errors.
- Forgetting to pay tax before filing GSTR-3B — schedule challans early to avoid interest.
Practical reconciliation checklist
Signed invoices (outward supplies) for the period
Purchase invoices with GSTIN of suppliers
Debit/Credit notes issued/received
Bank statements for the period (to support cash transactions)
E-way bill records (if applicable)
HSN summary reports for goods
Book of accounts / accounting export (CSV/XLS)
Challan/payment receipts for tax payments
Payment & Challans
Pay taxes using the e-challan on the GST portal (PMT-06). Keep payment receipts for reconciliation.
ITC Reconciliation
Use GSTR-2A/2B to reconcile eligible credits. 2B is auto-generated and more reliable for ITC claims.
Amendments & Corrections
Small invoice mistakes can be corrected via subsequent returns. Large corrections may require notices and additional documentation.
Frequently asked questions
What if I file late?
Late fees and interest apply; pay tax immediately and file to limit penalties.
Can I revise GSTR-3B?
You cannot revise old GSTR-3B, but corrections can be adjusted in later returns subject to reconciliation rules.