The Colorado state sales tax rate is 2.9 percent, as of 2015, according to TaxRates.com. As a home rule state, however, municipal and city sales taxes can inflate the sales tax rate to values as high as 10.4 percent.
Only a handful of states employ home rule tax systems. Designed to distribute greater power to local governments, home rule tax systems empower them to levy additional sales taxes on top of existing state taxes, thus allowing them to fund ventures specific to the municipality, according to Sales Tax Support. Due to the complexities of zoning, determining the range of special tax zones can be complicated.