Sales & Use Tax

Sales & Use Tax

2023 Boulder County Sales & Use Tax Brochure

Boulder County collects sales & use tax on retail sales as well as county building permits and motor vehicle registration by applying the voter-approved tax rate as follows:

Tax PurposeRateStart DateExpirationResolution
Transportation Improvements 0.085%7/1/2009Perpetuity2022-048
Transportation Improvements - Trails0.015%7/1/2009Perpetuity2022-048
Alternative Sentencing0.185%1/1/202012/31/20242018-76
Jail Improvements & Operations0.050%1/1/2005Perpetuity2003-91
Human Services - Worthy Cause0.050%1/1/201912/31/20332017-89
Open Space0.125%1/1/202012/31/20342016-79
Open Space Capital Improvements 20050.100%1/1/200512/31/20242004-86
Open Space Capital Improvements 20080.100%1/1/201012/31/20292007-80
Open Space Capital Improvements 20110.150%1/1/201112/31/20302010-93
Wildfire Mitigation0.100%1/1/2023Perpetuity2022-050
Emergency Services 0.100%1/1/202312/31/20272022-052
Total Boulder County Sales & Use Tax Rate 1.185%

Tax District Rates

The following table provides the rates across tax districts within Boulder County:

Tax DistrictMunicipal DistrictSpecial DistrictBoulder CountyRTD & SCFDCO StateTotal RateBuilding PermitsContact
City of Boulder3.860%-1.185%1.100%2.900%9.045%Yes303-441.3051
City of Boulder Food Service4.010%-1.185%1.100%2.900%9.195%Yes303-441.3051
Town of Erie3.500%-1.185%1.100%2.900%8.685%Yes303-926-2700
City of Lafayette3.870%-1.185%1.100%2.900%9.055%Yes303-665-5588
City of Longmont3.530%-1.185%1.100%2.900%8.715%Yes303-651-8672
City of Louisville3.650%-1.185%1.100%2.900%8.835%Yes303-335-4507
Town of Lyons3.500%-1.185%1.100%2.900%8.685%Yes303-823-6622
Town of Nederland4.250%-1.185%1.100%2.900%9.435%Yes303-258-3266
Town of Superior3.460%-1.185%1.100%2.900%8.645%Yes303-499-3675
Town of Ward2.000%-1.185%1.100%2.900%7.185%County303-459-9273
Niwot Local Improvement District (LID)-1.000%1.185%1.100%2.900%6.185%Countyn/a
Niwot (Outside of Niwot LID)--1.185%1.100%2.900%5.185%County n/a
Unincorporate Boulder County--1.185%1.100%2.900%5.185%County303-441-4519
Colorado Department of Revenue, Sales Tax Division – 303-238-7378
Boulder County Office of Financial Management, Sales & Use Tax – 303-441-4519

Sales Tax

Boulder County’s Sales Tax Rate is 1.185% for 2023

Sales tax is due on all retail transactions in addition to any applicable city and state taxes.

Boulder County does not issue licenses for sales tax as the county sales tax is collected by the Colorado Department of Revenue (CDOR). Businesses register with CDOR to determine what taxes to pay. CDOR collects the sales tax from business on behalf of Boulder County.

All payments of Boulder County sales tax should be reported through CDOR’s Revenue Online or through CDOR’s printable forms found at CDOR’s website:

Other Information:

  • Sales tax returns are due the 20th of the month following the month reported. If the 20th falls on a holiday or a weekend, the due date is the next business day. Returns must be postmarked on or before the due date to be considered on time.
  • A tax return must be filled even if there is no tax due.
  • Sales tax accounting records must be retained by the collecting entity for three years from the date of filing and paying a return.
  • For exemption information please see the Colorado Revised Statues Section 39-26-114 under Taxation Division, Education and Legal Research links at

NOTE: Boulder County taxes are collected by the State of Colorado. All payments of sales tax should be reported and remitted directly to the Colorado Department of Revenue. Forms are available at contact the Colorado Sales Tax Office at 303-238-7378.

Use Tax

Boulder County collects Use Tax at a rate of 1.185% in 2023. Use tax is levied in the following circumstances:

  1. Motor Vehicles: Storing, using, or consuming in Boulder County any motor or other vehicle, purchased at retail on which a registration is required. This tax is collected at vehicle registration with the Boulder County Clerk & Recorder’s Office, Motor Vehicle Division.
  2. Building and Construction Materials: Applies to building and construction materials purchased in or delivered to Boulder County at retail. This tax is collected when a building permit is obtained for unincorporated Boulder County or the Town of Jamestown. By intergovernmental agreement, the tax is also collected by the municipal building departments in Boulder, Lafayette, Longmont, Louisville, Lyons, Erie, Superior, and Nederland.Performing construction work in Boulder County requires a building permit and the permit includes a use tax payment to the county (either directly to Boulder County or to the municipality that issues the permit). The cost of the building permit is a prepayment deposit of an estimated use tax. At the end of the project a reconciliation of estimated construction material costs and actual construction material costs may be requested to verify the use tax accuracy. The difference between the estimated tax and actual tax due is based on actual project cost. Building materials purchased in or delivered to Boulder County for a permitted project are exempt from the retail sales tax so contractors are encouraged to present the county building permit at the time of purchase. Contractors should keep all invoices and statements of construction materials from general contractors, subcontractors, and suppliers, along with a summary sheet showing such purchases for three years from the date of issuance of the certificate of occupancy. Please see the Building Permit website for further information.

Boulder County Brochure

Additional Tax Information

Contact Us

Sales & Use Tax

303-441-4524 (fax)


Office of Financial Management
Courthouse West Wing
1st Floor, 2020 13th Street
Boulder, Colorado 80302
Map & Directions
Hours: 8 a.m. – 4:30 p.m. M-F

Mailing Address

Office of Financial Management
Boulder County
PO Box 471
Boulder, CO 80306