1. What is GST?
Goods and Services Tax (GST) is a comprehensive indirect tax levied on the supply of goods and services across India. Introduced on July 1, 2017, it replaced a complex web of central and state taxes including VAT, service tax, excise duty, octroi, and CST. GST is a destination-based consumption tax — the tax revenue goes to the state where the goods or services are consumed, not where they are produced.
2. GST Slabs in 2025
GST in India is structured into five main tax slabs. The applicable rate depends on the type of goods or services:
| GST Rate | Category Examples | Tax Split (Intra-state) |
|---|---|---|
| 0% (Nil) | Fresh fruits & vegetables, milk, eggs, bread, salt, textbooks, newspapers, healthcare, education | 0% CGST + 0% SGST |
| 5% | Packed food items, tea, coffee (without milk), sugar, edible oil, medicine, railway transport, small restaurants | 2.5% CGST + 2.5% SGST |
| 12% | Butter, cheese, fruit juices, mobile phones, umbrella, business class air travel, hotel rooms (₹1,000–2,500) | 6% CGST + 6% SGST |
| 18% | IT services, telecom, branded garments, hotel rooms (₹2,500–7,500), restaurant (AC), financial services | 9% CGST + 9% SGST |
| 28% | Luxury cars, tobacco, aerated drinks, casino/gambling, hotel rooms above ₹7,500, cement | 14% CGST + 14% SGST |
3. CGST + SGST vs IGST
GST is divided differently depending on whether the transaction happens within a state or across states:
- Intra-state (within same state): The total GST is split equally into CGST (Central GST) and SGST (State GST). For example, on an 18% GST item sold within Maharashtra: 9% CGST goes to the central government and 9% SGST goes to Maharashtra.
- Inter-state (across states) or imports: IGST (Integrated GST) is charged at the full rate. The central government collects IGST and distributes the state portion to the destination state.
Example: A Gujarat-based manufacturer sells ₹1,00,000 worth of goods to a buyer in Gujarat (intra-state). Rate = 18%. Invoice shows: Base price ₹1,00,000 + CGST ₹9,000 + SGST ₹9,000 = Total ₹1,18,000.
4. When Must Your Business Register for GST?
GST registration is mandatory if:
- Goods suppliers: Aggregate turnover exceeds ₹40 lakh in a financial year (₹20 lakh for special category states like Jammu & Kashmir, Uttarakhand, Himachal Pradesh, etc.)
- Service providers: Aggregate turnover exceeds ₹20 lakh (₹10 lakh for special category states)
- Inter-state suppliers: Any business selling goods or services across state lines (no threshold exemption)
- E-commerce operators: Businesses selling through platforms like Amazon, Flipkart, or running their own e-commerce site
- Casual taxable persons: Businesses operating temporarily (e.g., exhibitions, trade fairs)
5. Composition Scheme (Simplified GST)
Small taxpayers can opt for the composition scheme, which offers lower compliance requirements:
| Business Type | Turnover Limit | Effective Tax Rate |
|---|---|---|
| Manufacturers | ₹1.5 crore | 1% (0.5% CGST + 0.5% SGST) |
| Restaurant services | ₹1.5 crore | 5% (2.5% CGST + 2.5% SGST) |
| Other suppliers | ₹1.5 crore | 1% (0.5% CGST + 0.5% SGST) |
| Service providers (w.e.f. 2019) | ₹50 lakh | 6% (3% CGST + 3% SGST) |
Key restrictions: Composition dealers cannot claim input tax credit (ITC), cannot issue tax invoices, and cannot supply inter-state or through e-commerce platforms.
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Open GST Calculator →6. Input Tax Credit (ITC)
One of GST's core features is the seamless flow of input tax credit. When you purchase goods or services for your business, the GST you pay (input tax) can be set off against the GST you collect from your customers (output tax).
ITC conditions:
- The supplier must have filed GSTR-1 and the recipient must have filed GSTR-2B
- The goods/services must be used for business purposes
- ITC cannot be claimed on: motor vehicles (except certain cases), food & beverages, membership fees, insurance (personal use)
- ITC must be claimed within the due date of filing September return for the preceding financial year
7. GST Returns Timeline
Key GST returns for regular taxpayers:
| Return | Due Date | Purpose |
|---|---|---|
| GSTR-1 | 11th of next month | Outward supply details (sales) |
| GSTR-3B | 20th of next month | Summary return + payment of tax |
| GSTR-9 | 31st December | Annual return (for turnover > ₹2 crore, with audit) |
| GSTR-9C | 31st December | Reconciliation statement (audited by CA for turnover > ₹5 crore) |
8. Conclusion
Understanding GST is essential for every Indian business owner. From choosing the right slab to filing returns on time, getting GST right saves you from penalties and helps you claim the input tax credit you're entitled to. Use the SmartUtilz GST Calculator for quick and accurate GST computations for your business.