How Do I Calculate Tax?

Formulas for Calculating Sales Tax Sales tax percent divided by 100 is the sales tax rate. List price multiplied by the sales tax rate equals the sales tax. List price plus sales tax equals total price with taxes, or. List price plus (list price multiplied by the sales tax rate), or. Total cost with tax is equal to list price multiplied by the sales tax rate.

How Do You Calculate Price After Tax?

How much sales tax is there, exactly? By moving the decimal point two spaces to the left, you can convert the tax percentage into a decimal. To get the sales tax cost, multiply the pre-tax amount by the freshly computed decimal number. To determine the overall cost, multiply the pre-tax value by the sales tax amount.