How to use the GST / VAT Calculator tool
- Choose add or remove“Add tax” when your price excludes tax. “Remove tax” when the price already includes it and you want to know the tax part.
- Enter the amountType the price or invoice amount.
- Pick the rateClick a common rate or type any custom rate.
- Read the breakdownSee the net amount, the tax and the total. For India, the tax is also split into CGST and SGST.
Features
- Tax-exclusive and inclusiveWorks forwards (add tax) and backwards (extract tax from a gross price).
- Any rateWorks for Indian GST, UK and EU VAT, Australian GST, Gulf VAT and any other percentage-based sales tax.
- CGST/SGST splitFor intra-state sales in India, the tax is divided equally between central and state GST.
- Clear formulaThe calculation is shown so you can double-check or reuse it on invoices.
GST and VAT in brief
GST (Goods and Services Tax) and VAT (Value Added Tax) are consumption taxes charged as a percentage of the price of goods and services. Businesses collect the tax from customers and pass it on to the government, usually after deducting the tax they paid on their own purchases. The names differ by country: India, Australia, New Zealand, Canada and Singapore use “GST”, while the UK, the EU and the Gulf states use “VAT”. The arithmetic is the same.
How to add GST or VAT
Tax = Net price × Rate ÷ 100 · Total = Net price + Tax
Example: a product priced at 1,000 before 18% GST: tax = 1,000 × 18 ÷ 100 = 180, so the total is 1,180.
How to remove GST or VAT from a total
A common mistake is to subtract 18% from a tax-inclusive price. That gives the wrong answer because the tax was calculated on the net price, not the total. The correct formula is:
Net price = Total ÷ (1 + Rate ÷ 100) · Tax = Total − Net price
Example: a total of 1,180 including 18% GST: net = 1,180 ÷ 1.18 = 1,000, so the tax is 180. Subtracting 18% of 1,180 would wrongly give a tax of 212.40.
India: GST rates and CGST/SGST
Since 22 September 2025 (“GST 2.0”), most goods and services in India fall into two main slabs, 5% and 18%, with a special rate of 40% for a small group of luxury and “sin” goods. Some items are exempt (0%), and special rates such as 3% apply to gold and jewellery. Always check the current rate for your specific product or service code (HSN/SAC) on the official GST portal or with your tax advisor.
- Intra-state sale (seller and buyer in the same state): the tax is split equally into CGST (central) and SGST (state). 18% GST becomes 9% CGST + 9% SGST.
- Inter-state sale (different states): the full rate is charged as IGST. Untick the CGST/SGST option to see the single figure.
Standard VAT/GST rates in other countries
| Country / region | Standard rate |
|---|---|
| United Kingdom (VAT) | 20% |
| Germany (VAT) | 19% |
| France (VAT) | 20% |
| Australia (GST) | 10% |
| United Arab Emirates (VAT) | 5% |
| Singapore (GST) | 9% |
Reduced rates often apply to food, books, children’s goods and other essentials. Rates change over time, so confirm the current rate with the relevant tax authority. This calculator is for general information and is not tax advice.