How to calculate GST in India

GST (Goods and Services Tax) is an indirect tax levied on the supply of goods and services in India. To add GST to a base price, multiply the amount by the applicable GST rate and add it to the original value. To remove GST from a GST-inclusive price, divide the total by (1 + rate) to find the taxable value and the embedded tax amount.

This free GST calculator is used by businesses, freelancers, accountants and CA firms across India to compute GST on invoices, quotations and purchase entries in seconds — with an automatic CGST, SGST and IGST split.

CGST, SGST and IGST explained

For an intra-state supply (buyer and seller in the same state), GST is split equally into Central GST (CGST) and State GST (SGST). For an inter-state supply (different states), a single Integrated GST (IGST) is charged at the full rate. This calculator switches the split automatically based on your selection.

GST for CA firms and accountants

Chartered Accountants and tax practitioners use this tool for quick client computations, reconciling input tax credit and verifying invoice tax values before filing GSTR-1 and GSTR-3B. For end-to-end client and compliance management, Hidesc helps CA firms track GST filings, due dates and tasks in one place.

Common GST rate examples (on ₹10,000 base)