HSN code on GST invoices: the 2026 rules

Quoting HSN codes on invoices is not optional once you cross certain turnover thresholds. Getting the digit count right keeps your GSTR-1 HSN summary accurate and avoids notices.

The digit requirement at a glance

"Aggregate turnover" means your total PAN-level turnover in the previous financial year — across all GSTINs, not just one state.

Where the HSN code must appear

• On every tax invoice line item.
• In your GSTR-1 HSN summary table (HSN-wise outward supplies).
• In your e-invoice JSON if e-invoicing applies to you.
• In marketplace catalogues, which feed your MTR/sales reports.

Common mistakes that trigger notices

• Using a 2-digit code where 6 are required.
• Different HSN codes for the same product across invoices.
• HSN in invoices not matching the HSN summary in GSTR-1.
• Copy-pasting a competitor's code without checking your exact product.

Stay compliant in three steps

1. Look up each product's HSN with the free finder.
2. Record the code in your product master so every invoice is consistent.
3. Reconcile your HSN summary with your invoices before filing GSTR-1.

Frequently asked questions