Tamil Nadu GST Calculator 2026
Calculate CGST, SGST, and IGST for transactions in Tamil Nadu. Registration threshold: ₹20 Lakhs.
Calculate GST for Tamil Nadu
Enter your transaction amount and GST rate to instantly calculate CGST, SGST (for intra-state) or IGST (for inter-state transactions).
Open Tamil Nadu GST CalculatorGST in Tamil Nadu — Complete Guide
The Goods and Services Tax (GST) in Tamil Nadu follows India's unified indirect tax system implemented on July 1, 2017. Tamil Nadu (TN) has a GST registration threshold of ₹20 Lakhs annual turnover.
GST Structure in Tamil Nadu
When you make a sale within Tamil Nadu (intra-state), the GST is split equally between CGST (Central GST) and SGST (Tamil Nadu State GST). For example, on an 18% GST item:
- CGST: 9% goes to the Central Government
- SGST: 9% goes to Tamil Nadu State Government
For inter-state sales (from Tamil Nadu to another state), IGST (Integrated GST) of 18% is charged instead, which is later distributed between central and destination state governments.
GST Rates Applicable in Tamil Nadu
- 0% (Exempt): Essential items like fresh food, healthcare services
- 5%: Basic necessities, economy hotel stays, transport
- 12%: Standard goods, processed food, business class travel
- 18%: Most services, electronics, standard goods
- 28%: Luxury items, automobiles, tobacco
GST Breakdown Examples for Tamil Nadu (2026)
Here is how GST applies to a ₹10,000 base value at each slab for an intra-state sale within Tamil Nadu, split equally into CGST (central) and SGST (Tamil Nadu).
| GST rate | Base value | CGST | SGST | Total GST | Invoice total |
|---|---|---|---|---|---|
| 5% | ₹10,000 | ₹250 (2.5%) | ₹250 (2.5%) | ₹500 | ₹10,500 |
| 12% | ₹10,000 | ₹600 (6%) | ₹600 (6%) | ₹1,200 | ₹11,200 |
| 18% | ₹10,000 | ₹900 (9%) | ₹900 (9%) | ₹1,800 | ₹11,800 |
| 28% | ₹10,000 | ₹1,400 (14%) | ₹1,400 (14%) | ₹2,800 | ₹12,800 |
For inter-state sales from Tamil Nadu, the same total is charged as a single IGST line instead of CGST + SGST.
Tamil Nadu GST Registration Requirements
Businesses in Tamil Nadu must register for GST if:
- Annual turnover exceeds ₹20 Lakhs
- Making inter-state taxable supplies
- Selling through e-commerce platforms
- Input service distributors
Tamil Nadu GST FAQs
When is GST registration mandatory in Tamil Nadu?
Businesses in Tamil Nadu (TN) must register for GST once annual turnover crosses ₹20 Lakhs. Registration is also required for inter-state supplies and e-commerce sellers regardless of turnover.
How much GST is charged on a ₹10,000 sale in Tamil Nadu?
At the standard 18% rate, a ₹10,000 intra-state sale in Tamil Nadu carries ₹1,800 GST — split as ₹900 CGST and ₹900 SGST — for a ₹11,800 invoice total.
What is the difference between CGST, SGST and IGST in Tamil Nadu?
For sales within Tamil Nadu, GST is split into CGST (to the central government) and SGST (to Tamil Nadu). For sales from Tamil Nadu to another state, a single IGST is charged instead and later shared with the destination state.