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GST calculator
Add goods and services tax to a price, or work backwards from a GST-inclusive bill to the net amount.
The two formulas
Adding GST: Total = Net × (1 + rate)
Removing GST: Net = Total ÷ (1 + rate)
A common mistake is to remove GST by subtracting the rate from the total. 18% off ₹11,800 gives ₹9,676, which is wrong; dividing by 1.18 gives the correct ₹10,000.
Current rate structure
Since 22 September 2025 most goods and services fall into two main slabs, 5% and 18%, with a 40% rate for a short list of luxury and sin goods. Essentials are exempt or nil-rated, and a few items keep special rates, such as 3% on gold. Within a state the tax is split equally into CGST and SGST; on sales between states the full amount is charged as IGST.
Questions
How do I find the rate for my product?
Rates are set by HSN code for goods and SAC code for services. Look up the code on the official GST portal or ask your tax professional.
Who has to register for GST?
Businesses above the turnover threshold for their state and category, and certain businesses regardless of turnover, such as those making inter-state taxable supplies of goods.