Sales Tax Calculator

^(*) All rates used here are for teaching purposes only.

Using this calculator you can find the 'Final Price including Tax ($)' by entering the 'Sale Tax' ($) and the 'Before Tax Price ($)'. So, we think you reached us looking for answers like:

What is Final Price including Tax of an item, given: Before Tax Price = $100 and Sale Tax = 7.5 percent (%)?

What is the Tax of an item, given: Sale Tax = 7.5 percent (%) and Before Tax Price = $100?

See the solutions to these problems below.

State Sales Taxes

As of January 1, 2021(for references only)

US State	Percent (%)
Alabama	4.00
Alaska	0.00
Arizona	5.60
Arkansas	6.50
California	7.25
Colorado	2.90
Connecticut	6.35
Delaware	0.00
D.C.	6.00
Florida	6.00
Georgia	4.00
Hawaii	4.00
Idaho	6.00
Illinois	6.25
Indiana	7.00
Iowa	6.00
Kansas	6.50
Kentucky	6.00
Louisiana	4.45
Maine	5.50
Maryland	6.00
Massachusetts	6.25
Michigan	6.00
Minnesota	6.875
Mississippi	7.00
Missouri	4.225

US State	Percent (%)
Montana	0.00
Nebraska	5.50
Nevada	6.85
New Hampshire	0.00
New Jersey	6.625
New Mexico	5.125
New York	4.00
North Carolina	4.75
North Dakota	5.00
Ohio	5.75
Oklahoma	4.50
Oregon	0.00
Pennsylvania	6.00
Rhode Island	7.00
South Carolina	6.00
South Dakota	4.50
Tennessee	7.00
Texas	6.25
Utah	6.10
Vermont	6.00
Virginia	5.30
Washington	6.50
West Virginia	6.00
Wisconsin	5.00
Wyoming	4.00

How to work out sales taxes - Step by Step

Here are the solutions to the questions stated above:

1) You purchase a item for 100 dollars and pay 7.5 % (percent) in tax. How much is tax and the final retail price including tax?

Firstly, if the tax is expressed in percent, divide the tax rate by 100. You can do this by simply moving the decimal point two spaces to the left. In this example, we do 7.5/100 = 0.075
Now, find the tax value by multiplying tax rate by the item value:

tax = 100 × 0.075

tax = 7.5
Finally, add tax to the before tax price to get the final price including tax:

The final price including tax = 100 + 7.5 = 107.5

Sales tax Formula (Final Price)

Final price including tax = before tax price × (1 + ^{tax rate (%)} / ₁₀₀)

or, if the tax is alread expressed in decimal,

Final price including tax = before tax price × (1 + tax rate)

2) You buy a item for 107.5 dollars after tax was added. You know that the applicable tax rate is 7.5%. How much is the before tax price?

Divide the percentage added to the original by 100. Here, a sales tax of 7.5 percent was added to the bill to make it 107.5. So, divide 7.5 by 100 to get 0.075.
Add one to the percentage, expressed as a decimal. In this example, add one to 0.075 to get 1.075.
Divide the final amount by the result of the previous step to find the original amount before the percentage was added. In this example, divide 107.5 by 1.075 to find the amount before the sales tax was added, which equals 100.

Sales tax Formula (Before Tax Price)

Before Tax Price ($) = Final price / (1 + ^{tax rate(%)} / ₁₀₀)

or, if the tax is alread expressed in decimal,

Before Tax Price ($) = ^{Final price} / _{(1 + tax rate)}

To find more examples, just choose one at the bottom of this page

More about sale taxes

Tax rates vary widely by jurisdiction and range from less than 1% to over 10%. Tax is collected by the seller at the time of sale. A sales tax is imposed at the retail level. In cases where items are sold at retail more than once, such as used cars, the sales tax can be charged on the same item indefinitely. To determine the (total) tax rate you should identify the total amount of tax you must charge. If, for example, a state has a two percent tax rate, a given county two percent and a city one percent, the total tax rate applicable is five percent: 2 + 2 + 1 = 5.