Sales Tax Calculator

1. Enter the base amount (price before tax). 2. Enter your tax rate (e.g., 10% sales tax, 20% VAT). 3. Optionally add a discount percentage. 4. Choose whether the amount includes tax or not. The calculator instantly displays the subtotal, discount, tax amount, and final total.

There are two everyday tax questions, and this calculator handles both. "Adding tax" starts from a pre-tax price and works out the final amount a customer pays. For example, a $100 item with 10% tax becomes $110. This is what you need when pricing a product or quoting a client. "Removing tax" (also called back-calculating) starts from a tax-inclusive total and separates the original price from the tax portion. If a receipt shows $110 including 10% tax, the base price is $110 ÷ 1.10 = $100, and the tax is $10. This is useful for bookkeeping, expense claims, and reconciling invoices where only the final figure is shown.

Different countries use different names for consumption tax, but the arithmetic is identical — you apply a percentage rate to a price. Sales tax is common in the United States and is typically added at the point of sale. VAT (Value Added Tax) is used across the UK, the EU, and many other regions and is usually included in the displayed price. GST (Goods and Services Tax) works similarly in countries like India, Australia, and Canada. Because rates vary by region and product category, always enter the rate that applies to your specific situation. This tool performs the math accurately for any rate you provide, but it does not know your local tax rules — treat the results as a calculation aid, not tax advice. For filing or compliance questions, check your local tax authority or a qualified accountant. All calculations run in your browser and nothing is stored.