# GST / VAT / Sales Tax Calculator > Add or remove GST, VAT, or sales tax from any price instantly. Includes country rate presets and reverse (tax-inclusive) calculation — free, private, and processed locally. The GST / VAT / Sales Tax Calculator adds tax to a net price or strips it out of a tax-inclusive total, with rate presets for the UK, EU, Australia, India, Canada, and more. It shows the net, tax, and gross breakdown instantly and processes everything locally. - **Live tool:** https://www.toolnova.org/finance-tools/gst-vat-sales-tax-calculator - **Category:** Finance Calculators (https://www.toolnova.org/finance-tools) - **Price:** Free - **Requirements:** Runs in a modern web browser · No signup · No install ## What this tool does - Add tax (net → gross) or remove tax (gross → net) - Country rate presets (UK, Australia, India, EU, Canada & more) - Custom rate support for any region - Instant net, tax amount, and gross breakdown - Reverse VAT / tax-inclusive calculation - 100% client-side — no data leaves your browser ## How to use GST / VAT / Sales Tax Calculator 1. **Pick a direction** — Choose to add tax to a net price or remove tax from a gross total. 2. **Set the rate** — Select a country preset or type a custom rate for your region. 3. **Enter the amount** — Add the price and see net, tax amount, and gross calculated instantly. 4. **Use the result** — Copy the figures for an invoice, quote, or expense record. ## Common use cases - A shop owner adds the correct VAT to a product price. - A freelancer extracts the tax portion from a gross client payment. - A traveler works out the pre-tax cost of a purchase for a refund claim. - An accountant checks a tax-inclusive total against the net figure. ## About ### Adding vs removing tax Adding tax takes a net price up to the gross a customer pays; removing (reverse) tax works backward from a gross total to find the net and the tax hidden inside it. Mixing these up is a common invoicing error — the calculator keeps the two directions explicit. ### The reverse calculation trap You can't find the tax in a gross amount by simply taking the rate off the total — the math works on the net figure, not the gross. Reverse mode applies the correct formula so a 20% VAT is properly extracted from an inclusive price. ### Right rate, right region GST, VAT, and sales tax rates vary by country and sometimes by product. Presets get common rates right instantly, while custom rates cover regional or reduced rates, so the breakdown always matches your jurisdiction. ## FAQ ### How do I add VAT or GST to a price? Multiply the net (pre-tax) amount by the tax rate to get the tax, then add it to the net. For example, £100 + 20% VAT = £100 × 0.20 = £20 tax, so the gross price is £120. Select 'Add Tax', enter your amount and rate, and the calculator does this for you. ### How do I remove VAT or GST from a total (reverse calculation)? Divide the gross (tax-inclusive) amount by 1 plus the rate. For example, to remove 20% VAT from £120: £120 ÷ 1.20 = £100 net, and the tax portion is £20. Choose 'Remove Tax' to run this reverse calculation automatically. ### What tax rate should I use for my country? This tool includes common presets — UK VAT 20%, Australia GST 10%, India GST 18%, Canada GST 5%, and more — but rates vary by product category and region. Use the custom rate field to match your exact local rate, and confirm with your local tax authority for compliance. ### Is my financial data saved? No. All calculations run entirely in your browser. Amounts and results are never uploaded, logged, or shared. ### How do I remove VAT from a total? Switch to reverse mode and enter the gross amount — the tool extracts the net price and the tax it contains using the correct formula. --- ToolNova — free, privacy-first browser tools. Most tools process data locally on your device. See https://www.toolnova.org/llms.txt for the full directory.