Add sales tax or VAT to a net price, or reverse it to extract the net price and tax amount from a tax-inclusive gross price.
Mode 1 (add tax): enter the pre-tax price and the tax/VAT rate as a percent (e.g. 20 means 20%). You get the tax amount and the tax-inclusive gross price. Mode 2 (remove tax): enter the tax-inclusive price and the rate to break it down into the net price and the tax amount. Formula: gross = net × (1 + rate/100); net = gross / (1 + rate/100). Example: a $100 item with 20% VAT costs $120 gross including $20 tax. Results update live as you type.