What is GST?
Goods and Services Tax (GST) is India's single indirect tax on the supply of goods and services. Common rates are 5%, 12%, 18% and 28%. For sales within a state, GST is split equally into CGST (central) and SGST (state); for inter-state sales it is charged as IGST at the same total rate.
Add GST vs Remove GST
- Add GST — you have the base price and want the final price. GST = base × rate. Use this to bill a customer.
- Remove GST — you have the final (inclusive) price and want the base. Base = total ÷ (1 + rate). Use this to find the pre-tax value of a receipt.
Formula
Add: GST = Amount × Rate% | Remove: Base = Amount ÷ (1 + Rate%)
Frequently asked questions
How are CGST and SGST calculated?
For a within-state sale, the total GST is split equally — e.g. 18% becomes 9% CGST + 9% SGST.
Can I use a custom rate?
Yes — type any rate in the custom box for special cases like 3% (gold) or 0.25%.