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Sales and Use Tax

NEW: The City of Boulder is considering changes to the Revenue Code related to the taxation of Remote Sellers for consideration at its May 18 council meeting. View the proposed changes here 2021 Proposed Revenue Code Changes Related to Taxation of Remote Sellers pdf. Comments are requested by April 26.

NEW: The City of Boulder is considering changes to the Revenue Code related to the taxation of Electronic Smoking Devices for consideration at its June 15 council meeting. View the proposed changes here 2021 Proposed Revenue Code Changes Related to Taxation of Electronic Smoking Devices pdf. Comments are requested by May 7.

The new Boulder Online Tax System is live! Here’s what you need to know:

  1. Access the new site here:
  2. Boulder Online Tax help videos and articles are here:
  3. We want to help you. We are experiencing high volumes of calls and emails. We will respond to your voicemail or email as soon as possible and in the order in which they were received.



Dear Taxpayer,   

Mitigating the poten tial spread of COVID-19 to ensure the health and well-being of our staff and community is fundamental to providing service excellence. That is why, beginning today, the City of Boulder is implementing several precautionary social distancing measures . Please note the following important updates:   

  • 1. The Sales Tax building will be closed to the public until further notice. However, staff will be working between the hours of 8am and 5pm Monday through Friday and will continue to respond to voicemails and emails in the order in which they are received. For faster service, please contact us via email at [email protected] .  

  • 3. If you have not done so already, please create a web logon for Boulder Online Tax at . Once online, you can file and pay your taxes, amend returns, add/cease locations, and more. In order to create a web logon, you will need a letter or tax return with your new eight-digit Account Number and a Letter ID. If you do not have this letter, please contact Sales Tax staff at [email protected] for assistance.  

  • 5. Taxpayers may find that check payments mailed to PO Box 791 do not clear your bank account as quickly as normal. For faster deposit times, please make sure that payments are mailed to the address below, or pay online at .  

City of Boulder Sales Tax  

Dept 1128  

Denver, CO 80263-0001  

6. Payments postmarked on or before the 20 th of the month will be considered timely and will not be assessed penalties and interest.    

  •   If you are unable to pay online or mail a check, please contact Sales Tax staff at [email protected] to make alternate arrangements. Please keep in mind that taxes paid to a vendor or retailer are public monies held in trust for the sole use of the City of Boulder. Please ensure that you are remitting these monies on or before the due date on your tax return.   

Leer este mensaje en espanol haga clic aquí pdf  

Sales Tax FAQs

Guidance Regarding Marketplace Facilitators

Background : The 2019 Colorado General Assembly passed, and the governor signed HB19-1240, the legislation that implements an economic nexus standard remote (out-of-state) sellers and that imposes new tax collection responsibilities on both in-state and out-of-state businesses. This legislation pertains only to state-collected taxes and does not impact locally collected home-rule taxes such as the city of Boulder’s salestax.

The Colorado Department of Revenue has implemented a portion of this legislation with respect to Marketplace Facilitators – an online business that contracts with local businesses to facilitate local businesses’ sales on the Marketplace Facilitator’s internet platform, and that collects payment from purchasers/customers and then transmits it to the local business. These new Marketplace Facilitator rules are effective October 1, 2019.

More information on the new State rules for Marketplace Facilitators can be found here

Additional information on the state’s implementation of HB19-1240 can be found here

City of Boulder Nexus Standards for Online Retailers and Marketplace Facilitators:

The City of Boulder is a home rule city that collects and administers city sales tax locally. The city has not amended its code or otherwise changed its physical presence standards. However, the City of Boulder is aware that several marketplace facilitators are changing their tax collection methodology in light of the State of Colorado’s implementation of HB19-1240. While the City of Boulder has not amended its nexus standards, any business that voluntarily collects City of Boulder taxes must remit those taxes directly to the City of Boulder.

Guidance for Marketplace Facilitators:

Marketplace facilitators that voluntarily elect to collect City of Boulder taxes for their sellers may choose to remit said taxes to their sellers, or directly to the City of Boulder. If a marketplace facilitator chooses to remit taxes directly to the City of Boulder, it must apply for a City of Boulder Sales and Use Tax (Business) license. Please indicate that the business is a marketplace facilitator voluntarily remitting taxes on behalf of its sellers in the “Nature of Business” section of the application. 

Guidance for Boulder Businesses Using Marketplace Facilitators:

City of Boulder businesses that use marketplace facilitators have a responsibility to confirm with their marketplace facilitators that the marketplace facilitator is licensed with the city and collecting and remitting city of Boulder sales tax on all sales sourced to Boulder. Local businesses that make sales of tangible personal property and taxable services are ultimately liable for the sales taxes due on those sales.

Using a marketplace facilitator does not relieve a City of Boulder licensed business from the responsibility to file tax returns. Please indicate any sales conducted through a marketplace facilitator in the following deduction fields:

• For Sales and Use Tax Returns: “Sales to Other Licensed Dealers for Purpose of Taxable Resale”

• For other return types: “Other”

For any questions, please feel free to contact Sales and Use Tax staff at [email protected]

Does my business have nexus in Boulder? (Wayfair)

Boulder is a locally-collected/administered home-rule city, and as such the state's new rules do not apply to the city's nexus criteria.

The City of Boulder has not amended its code or otherwise changed its physical presence standards.

Currently, the City of Boulder has not followed or otherwise conformed with Colorado's approach to changing its nexus standards and licensing requirements. However, Boulder and other Colorado home-rule cities are currently in discussions about the implications of Colorado's emergency rule for home-rule city tax collection by remote sellers.

Our nexus standards are still outlined in the city code as follows:

BRC 3-1-1. - Definitions Engaged in business in the city means performing or providing services, or selling, leasing, renting, delivering, or installing tangible personal property for storage, use, or consumption within the city.

Engaged in business in the city includes, without limitation, any one of the following activities by a person: (a) Directly, indirectly, or by a subsidiary, maintaining a building, store, office, salesroom, warehouse, or other place of business within the city; (b) Sending one or more employees, agents, or commissioned sales persons into the city to solicit business or to install, assemble, repair, service, or assist in the use of its products, or for demonstration, or for any other reason; (c) Maintaining one or more employees, agents, or commissioned sales persons on duty at a location within the city; (d) Owning, leasing, renting, or otherwise exercising control over real or personal property within the city; or (e) Making more than one delivery into the city within a twelve-month period by any means other than a common carrier.

Important information about new sales tax policy and system changes in 2020 


New - City Manager Rule Defining Postmark Date as Proof of Timely Filed and Paid pdf

For the purposes of determining penalties and interest, timely remittance of a return and payment may be evidenced by the postmark date if mailed. Section 3-2-4, "Vendor Liable for Tax,"B.R.C. 1981

New - City Manager Rule Establishing Minimum Requirements for an Application for a Sales and Use Tax License (Business License) or Exempt Institution License pdf

>Any statement on a license application that is later found to be incorrect, false, misleading, or incomplete, shall be considered cause to revoke the license. Chapter 3-17, "General Provisions for Tax Compliance," B.R.C. 1981

What does the Sales & Use Tax Staff do?

Our main purpose is to provide customer service in order to assist the Boulder taxpaying community with sales, use and various other tax reporting requirements required by Chapters 3-1 through 3-7 of the Boulder Revised Code (B.R.C, 1981). The division provides business licensing services and collects and accounts for a variety of tax revenues.

Key Functions of the Sales & Use Tax Division include:

  • Collection of sales, use and other taxes; provide tax return preparation and business licensing assistance; process and account for tax returns filed.
  • Provide construction use tax reconciliation return filing support; process and review tax returns.
  • Tax collection and delinquent filing processes - contact delinquent taxpayers and work with them to bring the accounts into compliance.
  • Conduct tax audits - the division has an active audit program designed to educate taxpayers in order to improve reporting compliance and to recover unpaid tax revenue.
  • Conduct new business reviews - an educational opportunity between the taxpayer and the City to educate and assist businesses in understanding tax reporting requirements they may not be familiar with and to answer tax related questions.
  • Provide information - answer various tax related reporting and licensing questions from taxpayers.
  • Provide information regarding the sales and use tax portion of the Boulder municipal code.

Why do I need a license to start a business?

The City of Boulder Revised Code requires that all types of businesses in Boulder be licensed and approved by the City before operating. If a business has more than one location in the city, each location needs a separate license.

What is my filing frequency?

Filing frequency is determined by average tax due. Please notify us via email if the business needs a filing frequency change.

If average tax due is: Filing Frequency:
$300 or more per month File Monthly
$15-$300 per month File Quarterly
$15 or less per month File Annually

On which types of sales should I charge sales tax?

Sales tax should be charged on all retail sales of tangible personal property, rentals, and leases of equipment. Some services such as cable TV, telephone, maintenance contracts, gas and electric are also taxable.

What is use tax?

Use tax information can be found here: TR 43: Use Tax.

How do I file an amended return?

Beginning February 10, 2020 taxpayers will be able to amend returns online in Boulder Online Tax. Please contact Sales Tax staff for guidance or questions. 

303-441-3050 or [email protected] 

How do I print filed tax returns?

Beginning February 10, 2020 taxpayers will be able to print copies of previously filed tax returns online in Boulder Online Tax. Please contact Sales Tax staff for guidance or questions. 

303-441-3050 or [email protected] 

Watch a Boulder Tax Seminar


Now available ON DEMAND! Watch the entire Tax Seminar at your convenience by clicking on the link below.  The City of Boulder's Sales Tax Seminars are designed to give the viewer/attendee an over-view of the Sales/Use Tax code for the City of Boulder as well as filing requirements.  - Marijuana Tax Seminar

If you have any questions regarding topics covered in the webinar, feel free to give us a call Monday-Friday 8 a.m. to 5 p.m. at 303-441-3051.