Key takeaways
What this article covers, in order:
- What is HSN and SAC codes?
- Why it matters for your business
- A quick example
- How HelloBooks helps
- Frequently asked questions
The wrong code means the wrong rate — and a mismatch notice. Here is a plain-English explanation for Indian business owners.
What is HSN and SAC codes?
HSN codes classify goods and SAC codes classify services, and they decide the GST rate that applies.
GST in India is a destination-based tax split into CGST and SGST for sales within a state and IGST for inter-state sales. Following the rate overhaul effective 22 September 2025, most goods and services sit in a simplified two-slab structure (5% and 18%), with a higher 40% rate reserved for a short list of luxury and "sin" items, and essentials kept exempt.
Why it matters for your business
Understanding HSN and SAC codes keeps your invoices compliant, protects your input tax credit, and avoids notices from the department. It is the difference between a clean GSTR-9 and a reconciliation headache.
- HSN = Harmonised System of Nomenclature for goods.
- SAC = Services Accounting Code for services.
- The number of digits you must quote depends on your turnover.
A quick example
A textile trader quotes the correct HSN code on every invoice so the rate, the GSTR-1 summary and the buyer’s input tax credit all line up.
How HelloBooks helps
HelloBooks turns the compliance steps above into a few clicks. HelloBooks is free GST accounting software for Indian businesses: you can raise GST-compliant invoices with the correct HSN or SAC code, track input tax credit against your GSTR-2B, and file unlimited GSTR-1 and GSTR-3B returns from one dashboard.
- GST-ready invoicing with automatic CGST / SGST / IGST split and HSN or SAC codes.
- GSTR-2B reconciliation so you only claim the input tax credit you are actually entitled to.
- GSTR-1 and GSTR-3B filing free, with GSTR-9 generated ready to file and e-invoicing on higher plans.
- Due-date reminders so a late fee never catches you by surprise.
Thousands of founders, freelancers and accountants in India run their books on HelloBooks — you can start free, with no credit card.
Frequently asked questions
What exactly is HSN and SAC codes in GST?
HSN codes classify goods and SAC codes classify services, and they decide the GST rate that applies.
Is this the same across all Indian states?
GST is a national law, so the core rules are the same across India, but the state (SGST) half of the tax and your jurisdictional office depend on the place of supply.
Does HelloBooks handle this automatically?
Yes — HelloBooks applies the correct treatment on every invoice and carries it through to your GSTR-1 and GSTR-3B so you do not have to calculate it by hand.
