Sales & Use Tax | Account / License

The Colorado sales tax license (in other parts of the country, may be called a reseller’s license, a vendor's license or a resale certificate) is for state sales tax and any state-collected county, city and special district taxes that the Colorado Department of Revenue collects and distributes back to local governments. Sometimes taxpayers refer to this as a business registration, but it is an application for a Colorado sales tax account or sales tax designation. 
In Colorado, services are not taxable. "Tangible Personal Property" is taxable in Colorado. For reference, see C.R.S. 39-26-102(15)(a)(I).