Goods & Services Tax (GST) Calculator
Compute GST inclusive and exclusive pricing, reverse tax calculations, and inspect CGST, SGST, and IGST breakdowns for all rate slabs.
Understanding Goods and Services Tax (GST) in India
Implemented on 1st July 2017 under the 101st Constitutional Amendment Act, the Goods and Services Tax (GST) subsumed multiple cascading central and state indirect levies—such as Central Excise Duty, Service Tax, State VAT, Entry Tax, and Luxury Tax—into a unified, consumption-based indirect tax system across India under the guiding principle of "One Nation, One Tax".
GST is structured as a destination-based tax levied at each stage of value addition throughout the supply chain. Because it provides a seamless flow of Input Tax Credits (ITC), businesses only pay tax on the incremental value they create, eliminating the tax-on-tax (cascading) effect that historically plagued Indian commerce.
The Three Types of GST: CGST, SGST, and IGST Explained
| Tax Type | Governing Body | Applicability | Revenue Sharing |
|---|---|---|---|
| CGST (Central GST) | Central Government of India | Intrastate sales (within same state) | Retained by the Union Government |
| SGST (State GST) | Respective State Government | Intrastate sales (within same state) | Retained by the seller's state |
| IGST (Integrated GST) | Central & Consuming State | Interstate transactions & imports | Collected by Centre; shared with destination state |
Mathematical Formulas for GST Calculations
Depending on whether your base price already includes taxes or requires tax addition, two distinct formulas apply:
GST Amount = [Base Price × GST Rate (%)] / 100
Total Price = Base Price + GST Amount
2. Removing GST (Inclusive Reverse Calculation):
Base Price = Total Price × [100 / (100 + GST Rate (%))]
GST Amount = Total Price - Base Price
Why You Cannot Simply Subtract the Percentage:
A common accounting error is trying to remove 18% GST by multiplying the gross amount by 0.18 and subtracting it. If a product costs ₹1,180 inclusive of 18% GST, subtracting 18% directly gives: 1,180 × 0.18 = 212.4, leaving ₹967.60, which is incorrect! Under the true statutory formula: 1,180 × (100 / 118) = ₹1,000.00, with exactly ₹180.00 in GST.
The Standard GST Rate Slabs in India
- 0% (Exempt): Essential food grains, fresh milk, vegetables, eggs, unbranded flour, salt, newspapers, and healthcare services.
- 0.25% & 3%: Special low rates applying to rough diamonds (0.25%) and gold, silver, and precious jewelry (3%).
- 5% Slab: Household essentials, packaged food items, edible oils, domestic LPG, tea, coffee, life-saving medicines, and railway/economy air transport.
- 12% Slab: Processed foods, business-class air tickets, computers, cell phones, processed fruit juices, and apparel above specified thresholds.
- 18% Slab: The standard rate covering over 60% of commercial transactions: enterprise IT services, financial banking fees, consumer electronics, restaurants, hotels, and telecom services.
- 28% Slab: High-end luxury and sin commodities: automobiles, air conditioners, high-end motorbikes, tobacco products, and aerated soft drinks.
Frequently Asked Questions
Who is required to register for GST in India?
Any business providing goods with an annual aggregate turnover exceeding ₹40 Lakhs (₹20 Lakhs for special category northeastern states) or supplying services exceeding ₹20 Lakhs (₹10 Lakhs in special states) must register for GST. In addition, all e-commerce sellers and interstate suppliers must register regardless of turnover.
How does Input Tax Credit (ITC) save money for businesses?
If you purchase raw materials worth ₹10,000 and pay ₹1,800 in GST, and subsequently sell the finished product for ₹15,000 collecting ₹2,700 in GST, you do not pay ₹2,700 to the government. Instead, you subtract your input credit: ₹2,700 - ₹1,800 = ₹900 net tax liability.
What is an HSN or SAC code on a GST invoice?
HSN (Harmonized System of Nomenclature) is an 8-digit international coding system used to classify physical goods. SAC (Services Accounting Code) is a 6-digit classification system used for services. They ensure the correct GST rate is applied across all jurisdictions.
Can unregistered consumers claim GST refunds?
No. Retail consumers paying GST on personal retail purchases cannot claim Input Tax Credit or refunds. Only registered businesses with a valid GSTIN (GST Identification Number) who file regular returns (GSTR-1 and GSTR-3B) can claim ITC.