Add GST to a base price, or work out the base price and GST amount hidden inside a GST-inclusive price.
GST (Goods and Services Tax) in India is levied at four main slab rates — 5%, 12%, 18%, and 28% — depending on the category of goods or services. To add GST to a base price, you simply multiply by the rate; to find the base price hidden inside a GST-inclusive price, you divide the total by (1 + rate/100).
For transactions within the same state, GST is split equally into CGST (Central GST) and SGST (State GST) — for example, an 18% GST bill would show as 9% CGST + 9% SGST. For transactions between different states, the full amount is instead charged as IGST (Integrated GST) to a single head.
CGST and SGST apply together for sales within the same state, splitting the GST revenue between central and state governments. IGST applies for sales between different states, and the revenue is later apportioned between the states involved.
GST rates are assigned by category under India's GST rate schedule — everyday essentials are often at 5% or exempt, standard goods and services at 12-18%, and luxury or sin goods at 28% (sometimes with additional cess). Check the current official GST rate list for your specific item.
Yes — the Maximum Retail Price on packaged goods is required to be GST-inclusive, meaning the tax is already built into that number.