Why HSN errors are so common
HSN mismatches between invoices and GSTR-1 are among the top reasons for portal warnings and buyer ITC issues. Manual entry across hundreds of line items makes typos inevitable.
Even a single wrong digit can map to an entirely different product category, affecting tax rate validation.
What auto-fetch actually does
HSN auto-fetch pulls registered HSN details from the GST portal for each GSTIN and stores them against your product and invoice lines. When you prepare GSTR-1, summaries inherit validated codes instead of free-typed values.
- Syncs HSN from the portal after OTP-authenticated login.
- Flags lines where invoice HSN does not match master data.
- Reduces rework before filing and post-filing amendments.
Best practices
Run an HSN sync at the start of each return period and after any major catalog change. Pair auto-fetch with a short manual review for new SKUs — automation handles repetition, humans handle exceptions.