This article gives you a free Sales Tax Decalculator template to use in Excel.
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.
The Excel sales tax decalculator works by using a formula that takes the following steps:
Step 1: take the total price and divide it by one plus 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

Here is the formula for decalculating the tax or determining the pre-tax price of the good/service.
Pre-Tax Price = TP – [(TP / (1 + r) x r]
Where:
TP = Total Price
r = Tax rate
These types of formulas and functions are covered in detail in our free Excel crash course.
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