Key takeaways
What this article covers, in order:
- What is the CGST / SGST / IGST split?
- Why it matters for your business
- A quick example
- How HelloBooks helps
- Frequently asked questions
Getting this split wrong is the most common reason invoices get rejected. Here is a plain-English explanation for Indian business owners.
What is the CGST / SGST / IGST split?
Every GST transaction is split into components depending on whether the sale is inside a state or across states.
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 the CGST / SGST / IGST split keeps your invoices compliant, protects your input tax credit, and avoids notices from the department. Small mistakes here are what trigger mismatches and penalties later.
- CGST + SGST apply to sales within the same state.
- IGST applies to inter-state sales and imports.
- The total rate is the same either way — only the split changes.
A quick example
A Mumbai shop selling to a Mumbai customer charges CGST + SGST. The same shop selling to a Delhi customer charges IGST at the same total rate.
How HelloBooks helps
You do not have to track any of this on a spreadsheet — HelloBooks does it for you. 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 the CGST / SGST / IGST split in GST?
Every GST transaction is split into components depending on whether the sale is inside a state or across states.
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.
