File GSTR-3B
Summary return with tax payment.
GSTR-3B is the monthly summary return. It pulls outward supply totals from GSTR-1 and ITC from your reconciled GSTR-2B, then computes net tax due.
Workflow
1. Make sure GSTR-1 is filed and GSTR-2B reconciled for the same period.
2. Open **GST → Returns → GSTR-3B**. The numbers are pre-filled.
3. Review each table (3.1 outward, 4 ITC, 5 exempt, 6.1 payment).
4. If you owe tax, generate a challan via **Pay tax**. AskBooks creates the challan on the GST portal and gives you a payment link.
5. Once paid, the challan number auto-populates. Click **Submit & file**.
Late fee and interest
If you're filing past the due date, AskBooks adds the late fee (₹50/day for nil returns, ₹100/day otherwise) and interest at 18% on the unpaid tax. Both are clearly broken out before submission.