Sales tax Add a percent, or pull the tax back out of a total. Details Add a tax percent to a price, or pull the tax back out of a total that already includes it. The rate is not looked up. You type the percent that applies where you are. Category: Business Page: /tools/sales-tax-calculator Text: /tools/sales-tax-calculator.txt Limits Rates are not looked up. You type the percent that applies. Steps 1. Enter the amount and rate. 2. Choose add tax or extract tax. 3. Read net, tax, and total. Questions What is reverse tax? The amount already includes tax. Net is amount divided by 1 plus the rate. Can I stack two rates? Add them yourself and type the combined percent. Is this VAT advice? No. It is the percent math only.