Indian GST Calculator (Add / Remove GST)
Calculate GST inclusive and exclusive amounts in real time. Features standard 0%, 3%, 5%, 12%, 18%, and 28% tax slabs with instant itemized invoice breakdown.
Itemized Tax Invoice Breakdown
Formal tax invoice summary compliant with GST Rules
Comprehensive Guide to Goods and Services Tax (GST) in India
Updated with latest CBIC circulars, reverse charge mechanisms, and HSN slabs
Implemented on July 1, 2017, under the principle of "One Nation, One Tax", India's Goods and Services Tax (GST) replaced a complex web of cascading indirect taxes, including Central Excise Duty, Service Tax, State VAT, Entry Tax, and Luxury Tax. GST is a destination-based consumption tax collected at every step of value addition with seamless Input Tax Credit (ITC) mechanisms.
Understanding the Four Components of GST
Depending on whether a sale happens within the same state or across state borders, the GST framework is split into distinct categories:
Levied by the Central Government on intra-state supplies of goods and services. Constitutes exactly 50% of the total GST rate.
Collected by the respective State Government or Union Territory without legislature on intra-state sales.
Levied on all inter-state transactions (goods moving between two states) and imports. Collected by the Centre and shared with the destination state.
Levied on demerit and luxury goods (e.g., pan masala, motor vehicles, aerated drinks) over and above the 28% peak GST slab.
GST Rate Slabs in India: 2026 Reference Matrix
| Slab Rate | Category | Representative Goods & Services |
|---|---|---|
| 0% (Nil) | Exempt Essentials | Fresh milk, fresh vegetables, unbranded food grains, bread, salt, curd, jaggery, hearing aids. |
| 3% (Special) | Precious Metals | Gold, silver, diamonds, platinum bullion, and gold jewelry ornaments. |
| 5% | Basic Necessities | Packaged food, sugar, tea, coffee, edible oil, life-saving medicines, economy flight tickets, renewable energy equipment. |
| 12% | Standard Goods | Computers, frozen meat products, butter, cheese, ghee, fruit juices, apparel above ₹1,000, business class air travel. |
| 18% | General & Services | IT software, banking services, telecom, broadband, restaurants, capital goods, hair oil, toothpaste, industrial machinery. |
| 28% | Luxury & Sin Goods | Automobiles, high-end motorcycles, air conditioners, refrigerators, cement, tobacco, online gaming, aerated soda. |
How Reverse GST (Inclusive) Calculation Works
When you purchase a retail product, the displayed Maximum Retail Price (MRP) already includes GST. When an accountant or business owner needs to record the purchase in their ledger to claim Input Tax Credit, they must extract the Base Price and GST Amount using the following mathematical derivation:
1. Formula for Base Price (Exclusive of GST):
Base Price = (MRP × 100) ÷ (100 + GST Rate)
2. Formula for GST Amount:
GST Amount = MRP − Base Price
Worked Example: If an electronic gadget has an MRP of ₹11,800 under the 18% slab:
• Base Price = (₹11,800 × 100) ÷ (100 + 18) = ₹11,800 ÷ 1.18 = ₹10,000.
• GST Amount = ₹11,800 − ₹10,000 = ₹1,800 (split as ₹900 CGST and ₹900 SGST).
Frequently Asked Questions (FAQs)
Who is required to register for GST in India? ▾
Businesses supplying goods with an annual turnover exceeding ₹40 Lakhs (₹20 Lakhs for special category northeastern states) and service providers exceeding ₹20 Lakhs (₹10 Lakhs in special states) must register for GST. E-commerce sellers and businesses making inter-state supplies must register mandatorily irrespective of turnover.
What is Input Tax Credit (ITC)? ▾
Input Tax Credit allows a registered business to reduce the GST paid on purchases (raw materials, capital equipment, professional services) from the GST collected on output sales, eliminating double taxation and cascading costs.
Are petrol and diesel covered under GST? ▾
No. Five petroleum products (crude oil, high-speed diesel, petrol, natural gas, and aviation turbine fuel) and potable alcohol are temporarily outside GST. They continue to attract Central Excise Duty and State VAT.
What is the Composition Scheme in GST? ▾
Small taxpayers with an annual turnover up to ₹1.5 Crore can opt for the Composition Scheme to pay tax at a flat subsidized rate (1% for manufacturers/traders, 5% for restaurants, 6% for service providers) and file quarterly returns, but they cannot collect GST from customers or claim ITC.