GST VAT Calculator

GST and VAT explained

GST (goods and services tax) and VAT (value-added tax) are consumption taxes charged as a percentage of the price of goods and services. They are collected by businesses at each stage of the supply chain, but the business can usually reclaim the tax it paid on its own purchases, so the final consumer bears the cost. The United Kingdom and the European Union use VAT; India, Australia, Canada, New Zealand and Singapore use GST. The arithmetic is identical.

The price before the tax is the net amount, the price with the tax is the gross amount, and the tax is the difference. The calculator gives all three from either starting point.

Adding and removing tax

To add tax to a net price, multiply by the rate. ₹10,000 with 18 percent GST is ₹1,800 of GST, so the gross amount is ₹11,800. To remove tax from a gross price, divide by 1 plus the rate. ₹11,800 ÷ 1.18 = ₹10,000, and the GST inside is ₹1,800. For a 20 percent VAT-inclusive price of £250, the net amount is £208.33 and the VAT is £41.67. Adding 20 percent to £250 instead gives £300, a different situation.

Take care to start from the right number. If the price on a bill is already tax-inclusive, use "Remove GST/VAT". If a supplier quotes a price "plus tax", use "Add GST/VAT". Mixing them up is the most common source of invoice errors.

CGST, SGST and IGST in India

India's GST has three components. For a sale within one state, the tax is split equally between the central government (CGST) and the state government (SGST). For a sale from one state to another, the whole amount is charged as IGST. With 18 percent GST on ₹10,000, an intra-state sale carries ₹900 CGST and ₹900 SGST, while an inter-state sale carries ₹1,800 IGST. The calculator shows these amounts under the results so you can copy them into an invoice.

The rates themselves are decided by the GST Council and grouped by goods and services, and they have been revised over time. Choose the rate that applies to your product or service from the current official schedule, or from your accountant, and enter it in the rate box. The quick buttons are only shortcuts, not a rate table.

Practical uses

Invoices are the main use: a tax invoice shows the net amount, the tax and the gross amount, and often needs the tax broken out by rate. The calculator helps you check a supplier's bill and prepare your own. It also helps compare prices from sellers who quote with and without tax, and estimate the tax content of an expense for reclaim. When a supplier gives you a discount as well as charging tax, apply the discount first with the Discount Calculator and then add GST or VAT to the reduced price.

• Copy the summary into an email or invoice draft.
• Check that line-item totals match the invoice total when there are several rates.
• Keep the tax separate from revenue in your books, since you owe it to the tax authority.
• Confirm whether a price shown in a shop or on a website is tax-inclusive.

Pricing for tax-inclusive markets

If you sell to consumers in a tax-inclusive market, the price on the shelf is the gross price. To know your real revenue, remove the tax: a ₹1,180 item at 18 percent GST earns you ₹1,000. Use that net revenue in the Profit Margin Calculator, otherwise your margin will look better than it is. The Sales Tax Calculator is the same maths with a per-item quantity, and the Percentage Calculator is useful for checking any figure by hand.

Limits

The calculator applies one flat rate to the amount. It does not model input-tax credits, reverse charge, composition schemes, exemptions, cess or rounding rules at line level, and it cannot know the correct rate for your goods. For filings and formal invoices, follow your tax authority's guidance or your accountant's advice. The calculation runs in your browser and nothing you enter is stored or sent.