How to Calculate GST in India: Add vs Remove GST Formulas & Slabs

The GST Council categorizes goods and services into four major standard tax tiers: - 0% (Exempt): Essential unbranded food grains, fresh produce, milk, books, healthcare. - 5%: Household essentials, edible oil, tea, coffee, spices, life-saving medicines, economy air travel. - 12%: Business computers, processed food items, processed dairy, mobile phones. - 18%: Standard business services, IT services, financial services, software, restaurants, capital goods. - 28%: Luxury cars, tobacco products, carbonated beverages, five-star hotel stays.

When quoting a pre-tax amount and calculating the total bill: GST Amount = (Base Price × GST Rate) / 100 Total Price = Base Price + GST Amount Example: A SaaS software license costs ₹10,000 with 18% GST: - GST Amount = (10,000 × 18) / 100 = ₹1,800 - Final Bill = 10,000 + 1,800 = ₹11,800

When you know the gross inclusive total and need to extract the pre-tax base price and tax component: Base Price = Gross Amount / (1 + (GST Rate / 100)) GST Amount = Gross Amount - Base Price Example: You purchased an item for ₹5,900 inclusive of 18% GST: - Base Price = 5,900 / (1 + 0.18) = 5,900 / 1.18 = ₹5,000 - GST Component = 5,900 - 5,000 = ₹900

- Intra-State Transaction (Seller and Buyer in same state): Tax is split 50/50 between Central GST (CGST) and State GST (SGST). For an 18% slab, 9% goes to CGST and 9% goes to SGST. - Inter-State Transaction (Seller and Buyer in different states): The entire 18% is billed as Integrated GST (IGST) directly to the Central Government.