Prepare and validate GSTR-1

GSTR-1 is the outward supplies return. ThynkTax builds it from the invoices in the period and runs 50+ validation checks.

Steps

1. GST → Returns → New → GSTR-1
2. Choose client + period
3. ThynkTax loads all draft outward invoices for the period.
4. Click Validate - runs the rule library (B2B GSTIN format, HSN coverage, IGST vs CGST+SGST, place-of-supply consistency, etc.).
5. Fix errors / acknowledge warnings.
6. Click Prepare - the return is moved to PREPARED status, ready for review.
7. CA review → Approve - Tier 2 agent approval gate.
8. File - submits via GSP; ARN returned and stored in the return record.

Where to find values

• B2B section - auto-populated from invoices with a recipient GSTIN
• B2C-Large - invoices > ₹1 lakh with no recipient GSTIN, in inter-state
• B2C-Small - everything else
• Credit / Debit Notes - auto-classified from invoice type
• Exports - invoices marked as export at import time
• HSN summary - auto-aggregated from line items
• Document summary - invoice numbering audit

Late-fee preview

If you're past the due date, ThynkTax shows the late fee that will apply on filing. You can choose to file anyway or defer.

Amendments

Amendments to filed GSTR-1 go in GSTR-1A (post-filing amendment for the same period) or in the next month's GSTR-1 (amendment of prior period).