Boulder (CO) Sales Tax

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The Boulder sales tax rate is 8.85%

Taxing jurisdiction Rate
Colorado state sales tax 2.90%
Boulder County sales tax 0.99%
City tax 3.86%
Special tax 1.10%
Combined Sales Tax 8.85%

Boulder sales Tax Calculator Colorado

To make it easier to calculate the Boulder (CO) Sales tax, we have created a calculator. All that you need to input is the zip code and the number of goods bought. The calculator will tell you how much you should approximately pay in sales tax. The tools are free to use and very simple.

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How does the Boulder sales tax compare to the rest of Colorado?

Adams Alamosa Arapahoe Archuleta Baca Bent Boulder Broomfield Chaffee Cheyenne Clear Creek Conejos Costilla Crowley Custer Delta Denver Dolores Douglas Eagle El Paso Elbert Fremont Garfield Gilpin Grand Gunnison Hinsdale Huerfano Jackson Jefferson Kiowa Kit Carson La Plata Lake Larimer Las Animas Lincoln Logan Mesa Mineral Moffat Montezuma Montrose Morgan Otero Ouray Park Phillips Pitkin Prowers Pueblo Rio Blanco Rio Grande Routt Saguache San Juan San Miguel Sedgwick Summit Teller Washington Weld Yuma

Each vendor in the USA needs to charge sales tax to the items and services that they sell. The Department of Revenue collects the sales tax proceeds from the vendors. The Boulder, CO sales tax rate is 8.85%. This includes 2.90% Colorado state sales tax, 0.99% Boulder County sales tax and 1.10% special tax.

A merchant adds the sales tax to all the qualifying sales completed in Boulder, CO. The Boulder sales tax should be clearly stated on the invoice. There are some specific goods and services are tax-exempt in Boulder (Colorado). Alcohol, tobacco and gas are subject to excise tax.


The 8.85% sales tax rate of the Boulder, CO applies to the following list of zip codes: 80301, 80302, 80303, 80304, 80305, 80306, 80307, 80308, 80309, 80310, 80314.

The vendor needs to check their district zip code to make sure that they are charging the right sales tax for the business transactions.

There are 87879 people in and around Boulder. It is important to be aware that zip-code boundaries do not always coincide with general boundaries. Therefore, when choosing sales tax rates, you should not focus only on zip-codes. In the event of a dispute, it is recommended that you contact the Internal Revenue Service to determine sales tax rates for you.

Alternative sales tax rate for Boulder

City Combined Tax State Rate County Tax City Tax Special Tax
Denver 8.81% 2.90% 0% 4.81% 1.10%

Popular questions about sales tax in Boulder

How do I calculate sales tax backwards?

Sometimes, people have a hard time figuring out the math behind sales taxes. This is especially true when people have the total transaction cost and the total sales tax. To figure out the sales tax percentage, we must do a bit of math, which is very simple and can be done via a phone calculator. Let’s assume that your total transaction with taxes is $106.25 and you know that the shelf price of the products purchased is $100.

The first thing that you do is subtract the cost of the goods from the total. In that case $106.25-$100=$6.25. Now you know that the sales taxes are $6.25. Then you divide the total sales tax by the shelf price of the cost of the goods bought, hence $100. So, ding the math, we have $6.25/$100 = 0.0625. We take the ratio number, and we multiply by 100%. Hence, we get : 0.00625*100%= 6.25%, which is the rate.

What states don`t have sales tax?

Sales taxes are regulated by state and federal laws. Since states control the amount of sales tax that they charge locally, some others have decided to omit sales taxes at all to facilitate transactions. There are municipalities, or cities that can impose their taxes. As of right now, there are 5 states in the USA that do not charge a state sales tax. These states are Alaska, Montana, Oregon, Delaware, New Hampshire.

How to charge sales tax?

Sales taxes are collected by the Department of Revenue. The taxes go to the General Fund, and it funds government expenses. Some parts of the sales tax fund state operations, such as K-12 education. The money can be used to fund other public services. The money collected from taxes is also used to pay the wages of jobs that are related to government agencies, such as police departments, libraries, museums, etc.

How to file sales tax?

You need to know all the applicable sales taxes that you should collect. You collect these taxes on each transaction. When it comes time to file your business quarterly returns, you declare your sales taxes collected and you pay them to the Department OF Revenue. You pay these taxes on January 15, April 15, July 15, and October 15. The type of sales taxes collected, and the rate depends on the business incorporation location and the applicable laws of that location.

How many states have sales tax?

45 states (do not levy these taxes in the states Alaska, Oregon, Delaware, Montana and New Hampshire) and the District of Columbia impose general sales taxes that apply to the sale or lease of most goods and some services, and states also may levy selective sales taxes on the sale or lease of particular goods or services. States may grant local governments the authority to impose additional general or selective sales taxes.