Generate, validate, and submit your monthly outward supply return.
When to file
GSTR-1 is the outward-supply return. Quarterly filers (turnover < ₹5 cr) submit by the 13th of the following quarter. Monthly filers submit by the 11th of the following month.
Generate the return
Go to **GST → Returns → GSTR-1**. Pick the return period; AskBooks aggregates every sales invoice, debit/credit note, and export entry, splits them by HSN summary and B2B/B2C classification, and produces the JSON GSTR-1 file.
Validate
The validator catches the usual issues: missing HSN codes, GSTIN format errors, place-of-supply mismatches, and tax computation drift. Fix each, hit **Re-run**, and proceed once it's clean.
Submit
Click **Submit to GSTN**. AskBooks uses your saved GST API token to push the JSON. On success, the ARN appears immediately. If the GSTN portal is busy, the submission queues and retries automatically — you'll get an email when it lands.
Amendments
Filed last month and need to fix a row? Use **GSTR-1 Amendments**: pick the original invoice, edit, and the system files an amendment row in next month's return.