Sales Tax Decalculator

This article gives you a free Sales Tax Decalculator template to use in Excel.

What is a sales tax decalculator?

A sales tax decalculator will tell you the pre-tax price of a good or service when the total price and tax rate are known.

You can download our free Excel template to determine the pre-tax price.

How the decalculator works

The Excel de-calculator works by using a formula that takes the following steps:

Step 1: take the total price and multiply it by one minus the tax rate

Step 2: multiple the result from step one by the tax rate to get the dollars of tax

Step 3: subtract the dollars of tax from step 2 from the total price

See the screenshot below for an example of the tax de-calculator formula in action.

Download the Excel template.

Pre-tax price formula

Here is the formula for de-calculating the tax, or determining the pre-tax price of the good/service.

Pre-Tax Price  =  TP – [(TP x (1 – r) x r]


TP = Total Price

r = Tax rate

More Excel and finance resources

If you want to become an Excel power user please check out our Excel Resources to learn all the most important functions, formulas, shortcuts, tips and tricks.