Boulder's Local Taxes & Fees: The Rules That Matter

Every city handles local taxes & fees a little differently. In Boulder, Colorado, there are 3 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Affordable Housing Linkage Fee

Boulder's commercial linkage fee, codified in BRC §9-13, charges new non-residential development by square foot to fund affordable housing. Rates vary by use (office, retail, industrial) and are updated periodically by city council.

Key details: Code: BRC §9-13. Charge basis: Per square foot. Highest tier: Office. Revenue use: Affordable housing fund.

Failure to pay the linkage fee blocks building permit issuance and certificate of occupancy. Underpayments discovered later trigger back-fee assessment with interest and possible permit revocation.

Mansion Tax (Measure ULA)

Boulder imposes no real estate transfer tax or mansion tax on high-value home sales. Colorado's Constitution restricts real estate transfer taxes after 1992, leaving Boulder without an LA-style ULA-type funding stream.

Key details: Boulder mansion tax: None. Constitutional limit: Article X §20. Year of limit: 1992. Alternative funder: Linkage fee.

There is no Boulder mansion tax to violate. Mistaken collection by a title company should be refunded; complaints go to the Colorado Division of Real Estate.

If you are coming from a city with tighter rules, you will find Boulder gives residents more flexibility on mansion tax (measure ula).

Business Tax Classification

Boulder businesses collect city sales tax on retail sales, plus dedicated taxes including the renewed Climate Action Plan Tax. Combined Boulder, county, and state retail sales tax exceeds nine percent on most tangible goods.

Key details: City code: BRC Title 3. Climate Action Tax: Renewed 2022. First adopted: 2007. Sales tax license: Required.

Failure to register, collect, or remit Boulder sales tax leads to back taxes, interest, late penalties, license revocation, and personal liability for responsible officers under Boulder finance code.

The Bottom Line

Boulder's local taxes & fees rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Boulder is broadly strict or permissive.

All of the above reflects Boulder's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.