Assessor's Office

Notice of Determination for Property Valuation Appeals

The Assessor’s deadline to mail determinations of property value appeals is August 15. If you disagree with the Assessor’s determination, you can file a written appeal to the Board of Equalization (BOE) on or before September 15.

• About your Notice of Determination
• Assessment Calendar

Senior Tax Exemption

Applications must be filed no later than July 15 for the exemption to apply to your tax bill the following year.
The Colorado Constitution establishes a property tax exemption for qualifying senior citizens, surviving spouses of senior citizens who previously qualified, and for disabled veterans.

• Senior Tax Exemption Qualifications, Amount, Forms, and Instructions

Business Personal Property

• Business Personal Property Overview
• About Business Personal Property Declarations

Ask a Question about Your Property

• Ask a question about your Business Personal Property.
  Business Personal Property value appeals are accepted as on-time June 15 through June 30 each year.
• Ask a Real Property question.
  Real property appeals are accepted as on-time May 1 through June 1 each year.
  Search for your Notice of Value (NOV) online.

Property Information, Mapping, & Data

Property Search

• Property Search
• Property Search Help

Property Data Download

• Downloadable Data Sets

Records Policies

• The Assessor’s Office policies reflect those of Boulder County, outlined in the Colorado Open Records Act (CORA).

Recent Sales

• Recent Sales Activity—lists of sales for specified time frames. These lists are not intended to be used for real property assessment appeals.

Learn more about:

• The Assessment Process
• Business Personal Property
• Agricultural Land
• Tax Exemptions for Seniors & Disabled Veterans
• Additional Resources