Calculate GST with CGST, SGST, and IGST breakdown. All 12 GST rates, reverse GST calculator, multi-item invoice, and trader brokerage GST. Updated for 2026.
Enter the GST-inclusive amount to extract the base price and tax components.
Add multiple line items to calculate GST for an entire invoice.
Calculate GST on brokerage, transaction charges, and trading costs. GST at 18% applies on brokerage and service charges — NOT on trade value or STT.
Understanding the GST calculation formula helps you verify invoices and budget accurately. There are two primary formulas depending on whether the amount is GST-exclusive or GST-inclusive.
GST Amount = Base Amount × (GST Rate / 100)
Total Amount = Base Amount + GST Amount
Total Amount = Base Amount × (1 + GST Rate / 100)
Base Amount = Total Amount / (1 + GST Rate / 100)
GST Amount = Total Amount - Base Amount
CGST = GST Amount / 2
SGST = GST Amount / 2
Each component = Total GST Rate / 2
IGST = Base Amount × (GST Rate / 100)
India's GST system has 12 distinct tax rates. Most online GST calculators only show 4 rates (5%, 12%, 18%, 28%), but our calculator supports all 12 including the special rates for gold, diamonds, and luxury goods.
Traders — including stock traders, commodity traders, and retail traders — have specific GST obligations. Here's what every trader needs to know about GST in 2026.
GST at 18% is levied on brokerage charges, transaction charges, and SEBI regulatory fees. However, STT (Securities Transaction Tax) and stamp duty are NOT subject to GST. This is a common confusion among traders — use our Trader GST tab above to calculate the exact breakdown.
For F&O trades, GST applies only on the service charges — brokerage, transaction charges, and SEBI fees. The premium amount or contract value is NOT subject to GST. STT on F&O is also exempt from GST.
Intraday trading attracts the same GST rules as delivery trading. GST at 18% on brokerage and transaction charges. The key difference is that intraday trades have lower brokerage rates (often flat Rs 20 per trade), so the GST amount is smaller.
Commodity trading on MCX/NCDEX attracts GST on brokerage at 18%. If you're trading physical commodities, the applicable GST rate depends on the commodity's HSN code.
Traders with annual turnover exceeding Rs 40 lakh (Rs 20 lakh for services, Rs 10 lakh for special category states) must register for GST. Stock traders providing advisory services need GST registration if turnover exceeds Rs 20 lakh.
Registered traders can claim ITC on GST paid on business expenses like office rent, computer equipment, internet bills, and data subscriptions. This reduces their net GST liability.
This table shows the GST rate applicable on commonly purchased items. Use this as a reference when calculating GST for your invoices.
| Item / Service | GST Rate | CGST | SGST |
|---|---|---|---|
| Restaurant (Non-AC, no alcohol) | 5% | 2.5% | 2.5% |
| Restaurant (AC or with alcohol) | 18% | 9% | 9% |
| Smartphone | 12% | 6% | 6% |
| Laptop / Computer | 18% | 9% | 9% |
| IT / Software Services | 18% | 9% | 9% |
| Freelance / Consulting | 18% | 9% | 9% |
| Stock Brokerage | 18% | 9% | 9% |
| Car (Hatchback) | 28% + 1% Cess | 14% | 14% |
| Car (SUV) | 28% + 22% Cess | 14% | 14% |
| Gold Jewellery | 3% | 1.5% | 1.5% |
| Hotel Room (Rs 1,000-7,500) | 12% | 6% | 6% |
| Electricity (Residential) | Nil | - | - |
The Composition Scheme allows small businesses to pay GST at a flat rate on turnover instead of collecting it on each sale. Here's who qualifies and what they pay:
| Business Type | Composition Rate | Turnover Limit |
|---|---|---|
| Manufacturers | 1% | Rs 1.5 crore |
| Restaurants (no alcohol) | 5% | Rs 1.5 crore |
| Other Service Providers | 6% | Rs 50 lakh |
| Traders (Goods) | 1% | Rs 1.5 crore |
Limitations: Cannot claim ITC, cannot make inter-state sales, cannot sell through e-commerce platforms, and cannot supply non-taxable goods.
HSN (Harmonized System of Nomenclature) codes classify goods, and SAC (Services Accounting Codes) classify services. These codes determine the applicable GST rate on your product or service.
GST Exclusive: GST Amount = Amount × (Rate / 100). Total = Amount + GST. GST Inclusive (Reverse): Base Amount = Total / (1 + Rate/100). GST = Total - Base. For example, Rs 10,000 at 18% exclusive = Rs 1,800 GST = Rs 11,800 total.
Traders charge GST on the sale value of goods based on the HSN code rate. They can claim Input Tax Credit (ITC) on GST paid on purchases. For stock traders, GST at 18% applies only on brokerage and service charges — NOT on the trade value or STT. Use our Trader GST tab to calculate exact costs.
A reverse GST calculator extracts the base amount and GST from a GST-inclusive price. Use it when you receive an invoice with GST included and need to find the pre-tax value. Formula: Base = Total / (1 + Rate/100). For Rs 11,800 at 18%: Base = Rs 10,000, GST = Rs 1,800. Our calculator has a dedicated Reverse GST tab for this.
CGST (Central GST) and SGST (State GST) are each half the total GST rate for intra-state transactions. For 18% GST: 9% CGST + 9% SGST. IGST (Integrated GST) is the full rate for inter-state transactions. The central government collects IGST and distributes it between centre and state.
Yes, GST at 18% is applicable on brokerage charges, transaction charges, and SEBI fees. STT (Securities Transaction Tax) is NOT subject to GST. For example, Rs 20 brokerage = Rs 3.60 GST = Rs 23.60 total. Our Trader GST tab calculates the exact breakdown.
India has 12 GST rates: 0% (exempt), 0.1% (gold/silver), 0.25% (rough diamonds), 1% (gems), 1.5% (cut diamonds), 3% (jewellery), 5% (essential goods), 6% (composite supply), 12% (smartphones, processed food), 18% (most goods and services), 28% (luxury), 40% (sin goods). Most calculators only show 4 — we support all 12 plus custom rates.
Freelancers with annual turnover above Rs 20 lakh (Rs 10 lakh for special category states) must register for GST. Most digital and professional services fall under the 18% GST slab. Freelancers exporting services can claim zero-rated supply with a Letter of Undertaking (LUT).
Yes, registered businesses can claim ITC on GST paid on business purchases. Requirements: valid GST invoice, supplier has filed returns, goods/services used for business, and you have filed GSTR-3B. ITC reduces your net tax liability — you only pay the difference between output tax and input tax.
The Composition Scheme is for small businesses with turnover up to Rs 1.5 crore (Rs 75 lakh for special states). Flat rates: 1% for manufacturers/traders, 5% for restaurants, 6% for service providers. Benefits: simplified returns. Limitations: no ITC, no inter-state sales, no e-commerce sales.
At 18% GST on Rs 1,00,000 exclusive: GST = Rs 18,000. Intra-state: CGST Rs 9,000 + SGST Rs 9,000. Inter-state: IGST Rs 18,000. Total = Rs 1,18,000. If inclusive (Rs 1,00,000 includes GST): Base = Rs 84,745.76, GST = Rs 15,254.24.
GST replaced VAT, Service Tax, and other indirect taxes from July 1, 2017. VAT was state-specific with varying rates; GST is a unified national tax. GST has input tax credit across the entire supply chain, eliminating the cascading effect of taxes that existed under VAT.
GST applies only on brokerage and transaction charges for F&O trades, NOT on the contract value or premium. STT is exempt from GST. At 18% GST on Rs 100 brokerage = Rs 18 GST. Total charge = Rs 118. Use our Trader GST tab to calculate exact costs including SEBI charges and stamp duty.