To add sales tax or VAT to a tax-exclusive (net) price, compute tax = net × rate ÷ 100 and the total as gross = net × (1 + rate ÷ 100). For example, $100 at 8.5% gives $8.50 tax and a $108.50 total. AnyTool Sales Tax & VAT Calculator does this live in Add tax mode, shows the worked formula, and lets you stack a second rate such as a city tax on top of the state rate.

When a price already includes tax, recover the pre-tax (net) value with net = gross ÷ (1 + rate ÷ 100), then the tax is gross − net. So a $108.50 tax-inclusive total at 8.5% breaks down to $100 net and $8.50 tax. AnyTool calls this Remove tax (reverse sales tax / VAT) mode — handy for separating the tax on a receipt or for tax-inclusive EU/UK VAT pricing.

In the US a price is often subject to state, county and city sales tax. These percentages stack additively, not compounded, so a 6% state rate plus a 2.5% city rate is a single 8.5% rate applied once — not 1.06 × 1.025. AnyTool lets you enable a second rate, sums the parts into the combined rate, applies it once, and shows how much of the tax each jurisdiction accounts for.

This tool handles consumption taxes — US sales tax, EU/UK VAT and similar — by adding, removing or finding a single rate on a price. For India’s Goods & Services Tax with CGST/SGST/IGST splits, use AnyTool’s GST Calculator; for personal income tax with brackets and deductions, use the Income Tax Calculator. Sales-tax and VAT rules also vary by jurisdiction, product and year, and many items are exempt or zero-rated, so confirm your local rate.