Reverse Sales Tax Calculator

How to use this calculator

This reverse sales tax calculator will calculate your pre-tax price or amount for you. You will need to input the following:

• Final price: Enter the final price or amount. This is the after-tax amount.
• Sales tax amount or rate: Enter either the sales tax amount in dollars (such as 10 for $10) or the sales tax rate (such as 8.5 for 8.5%0. Choose which one you are using in the drop-down menu.

Understanding your calculate results

Based on your inputs, the reverse sales tax calculator will determine what your pre-tax price or amount is.

• Pre-tax amount: This is the price or amount before any sales tax.
• Sales tax: This is the sales tax amount. For example, if an item costs $100, and the sales tax rate is 8%, then the sale tax is $8.
• Sales tax rate: This is the sales tax rate, which is a percentage to the pre-tax amount.
• Final price: The final price is the after-tax amount and includes the sales tax.

How do you find the original price before tax?

Using sales tax rate (percent)

If you know the final price and the sales tax rate, the formula for calculating the pre-tax price is:

For example, if the final price of an item is $25 and the sales tax rate is 9%, then the pre-tax price is:

Pre-tax price = Final price ÷ (1 + Sales tax rate) = $25 ÷ (1 + 9%) = $23.15

Using sales tax amount

If you know the final price and the sales tax amount in dollars, then the formula for calculating the pre-tax price is:

For example, if the final price of an item is $25 and the sales tax amount is $8, then the pre-tax price is:

Pre-tax price = Final price − Sales tax amount = $25 − $2 = $13

To calculate the sales tax rate, you would use the following equation:

In the above example, the sales tax rate would be $2 ÷ $16 = 8.7%.

Sales tax rates by state

Statewide sales taxes are collected by 45 states and the District of Columbia. In addition, in 38 states, an additional local sales tax is collected.

Below is a table from the Tax Foundation of the state level sales tax rates and the average local sales tax rates in those states.