Formulas
Adding GST: GST = value × rate. Removing GST: taxable value = inclusive amount ÷ (1 + rate); GST = inclusive amount − taxable value. Within a State the tax is split equally between CGST and SGST/UTGST; between States it is charged as IGST. Related guides: GST invoice rules, composition vs regular scheme.
Frequently asked questions
What are the GST rates now?
Since 22 September 2025 most goods and services fall in the 5% or 18% slab, with 40% on specified luxury and sin goods, and special rates for items such as gold (3%).
Is GST charged on the discount?
Discounts shown on the invoice reduce the taxable value. Post-sale discounts can reduce value through a credit note, subject to conditions.
Can a composition dealer charge GST?
No. A composition taxpayer issues a bill of supply and cannot collect tax from customers.
Tool last reviewed 10 November 2026. Results are estimates for general guidance and are not professional advice.
Have a tax, GST or business question?
Call, WhatsApp or email CA Dilbagh Singh and team, from Delhi, anywhere in India or abroad.