GST Calculator India
Add or remove GST from any amount. Supports all GST rates — 5%, 12%, 18%, and 28%. See CGST and SGST split instantly.
Understanding GST in India
The Goods and Services Tax (GST) is a comprehensive indirect tax that was introduced in India on 1st July 2017, replacing multiple cascading taxes such as VAT, service tax, excise duty, and several state-level levies. GST is levied on the supply of goods and services across India under a unified framework governed by the GST Council, which is chaired by the Union Finance Minister and includes representatives from all state governments. The implementation of GST was one of the most significant tax reforms in independent India, aiming to create a single national market by eliminating tax barriers between states.
GST in India follows a dual structure with Central GST (CGST) collected by the central government and State GST (SGST) collected by the respective state government on intra-state transactions. For inter-state transactions, Integrated GST (IGST) is levied by the central government, which is then apportioned between the central and destination state governments. The GST rates are organized into four main slabs: 5% for essential goods and services, 12% for standard goods, 18% for most services and manufactured goods, and 28% for luxury and sin goods. Additionally, some essential items like fresh food, milk, and healthcare are exempt from GST entirely.
GST Calculation Formulas
Adding GST: GST Amount = Base Amount × GST Rate / 100
Total = Base Amount + GST Amount
Removing GST: Net Amount = Gross Amount × 100 / (100 + GST Rate)
GST Amount = Gross Amount − Net Amount
Where:
- CGST = GST Amount / 2 (for intra-state transactions)
- SGST = GST Amount / 2 (for intra-state transactions)
- IGST = Full GST Amount (for inter-state transactions)
GST Rate Slabs Explained
The 5% GST slab covers essential items such as packaged food items, sugar, tea, coffee, edible oils, coal, fertilizers, economy class air travel, and small restaurants without input tax credit. The 12% slab includes processed food, computers, mobile phones, business class air travel, and work contracts. The 18% slab, which is the most commonly applicable rate, covers most services including IT services, financial services, telecom, restaurants with air conditioning and input tax credit, branded garments, and most manufactured goods. The 28% slab applies to luxury items including automobiles, tobacco products, aerated drinks, consumer durables like washing machines, and entertainment services.
CGST, SGST, and IGST Breakdown
Understanding the CGST-SGST-IGST split is crucial for businesses filing GST returns. When a transaction occurs within the same state (intra-state supply), the applicable GST rate is split equally between CGST and SGST. For example, an 18% GST intra-state transaction results in 9% CGST and 9% SGST. For inter-state transactions (supply between two different states), the full rate is charged as IGST. This calculator shows the CGST and SGST split by default. The IGST amount would equal the total GST amount shown. Businesses must correctly identify whether a transaction is intra-state or inter-state to apply the right tax heads.
Example Calculations
Example 1: Adding 18% GST to ₹10,000
A service provider bills ₹10,000 for IT consulting services at 18% GST.
- GST Amount = ₹1,800
- CGST (9%) = ₹900
- SGST (9%) = ₹900
- Total Invoice Amount = ₹11,800
Example 2: Removing 28% GST from ₹1,28,000
A customer wants to know the base price of a product billed at ₹1,28,000 inclusive of 28% GST.
- Net Amount = ₹1,00,000
- GST Amount = ₹28,000
- CGST (14%) = ₹14,000
- SGST (14%) = ₹14,000
Example 3: Adding 5% GST to ₹500 (Essential Goods)
A retailer sells packaged food worth ₹500 at 5% GST.
- GST Amount = ₹25
- CGST (2.5%) = ₹12.50
- SGST (2.5%) = ₹12.50
- Total Amount = ₹525
GST Registration and Compliance
Businesses with an annual turnover exceeding ₹40 lakh (₹20 lakh for service providers and special category states) must register for GST. Registered businesses must file monthly or quarterly returns (GSTR-1 for outward supplies, GSTR-3B for summary return) and an annual return (GSTR-9). The Composition Scheme is available for small businesses with turnover up to ₹1.5 crore, allowing them to pay a flat rate of 1-6% without claiming input tax credit. E-invoicing is mandatory for businesses with turnover exceeding ₹5 crore, and e-way bills are required for movement of goods valued above ₹50,000.
Input Tax Credit Under GST
One of the key advantages of GST is the seamless flow of Input Tax Credit (ITC) across the supply chain. Businesses can claim credit for GST paid on their purchases and set it off against their GST liability on sales. This eliminates the cascading effect of taxes that existed in the pre-GST regime. ITC can be claimed on goods and services used for business purposes, subject to certain restrictions. Blocked credits include GST on personal use, food and beverages, outdoor catering, club memberships, and motor vehicles (with exceptions). Proper documentation through tax invoices and timely filing of returns is essential to claim ITC without issues during GST audits.