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: multiply 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.


Sales Tax Decalculator


Example of calculating sales tax


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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


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These types of formulas and functions are covered in detail in our free Excel crash course.


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