Does registering for Colorado sales tax cover the home-rule cities?

What the state license covers

A person engaged in the business of selling at retail in Colorado must first obtain a sales tax license from the Department, with a separate license for each business location (C.R.S. 39-26-103; Colorado Department of Revenue, Colorado Sales Tax Guide (revised May 2026), Part 5). The guide states the fee as $16, prorated by the date of issuance, and states that licenses expire on December 31 of odd-numbered years. The state tax itself is imposed under C.R.S. 39-26-104 at 2.9 percent (Sales Tax Guide).

The same license carries a layer of local tax with it. Cities, counties and special districts may impose sales taxes, and the Department administers and collects many of them (Sales Tax Guide, Part 8). A retailer required to collect state tax also collects the applicable state-administered local taxes on sales sourced to those jurisdictions, and "[s]tate-administered local sales taxes are reported and remitted on the same form and at the same time as state sales taxes" (id.). The Department's SUTS portal states the boundary in one sentence: "Licenses issued by the Colorado Department of Revenue are valid for state sales taxes and all state-administered local sales taxes" (SUTS portal FAQ, local licensing answer).

The Department's own guide states the limit. Its introduction says the publication "pertains only to state and local sales taxes administered by the" Department, and Part 8 says the Department "does not administer and collect sales taxes imposed by certain home-rule cities." The Department's rate publication, DR 1002, separates state-collected jurisdictions from home-rule, self-collecting jurisdictions and directs readers to its last section for each self-collecting jurisdiction's contact information. The same line runs through the marketplace rules: a retailer that sells only through a marketplace may be relieved of state licensing and filing where the marketplace facilitator collects all applicable state and state-administered local taxes on its behalf (Sales Tax Guide, Part 4). Nothing in that relief speaks to a self-collecting city's tax.

Even inside the state-administered layer, the base is not uniform. The guide cautions that local exemptions do not match state exemptions in every respect and points to DR 1002 and the return instructions for the differences (Sales Tax Guide, Part 8). A state license therefore settles who collects a state-administered local tax, but not always what it reaches.

Where a home-rule city's own tax comes from

Article XX, section 6 vests the people of each home-rule city or town with power to adopt a charter, "which shall be its organic law and extend to all its local and municipal matters," and provides that "[s]uch charter and the ordinances made pursuant thereto in such matters shall supersede within the territorial limits and other jurisdiction of said city or town any law of the state in conflict therewith" (Colo. Const. art. XX, section 6, as quoted in City of Longmont v. Colorado Oil and Gas Ass'n, 2016 CO 29, paragraph 16). The Colorado Supreme Court sorts conflicts between a home-rule ordinance and a state statute into matters of local, statewide, or mixed concern: "in matters of local concern, a home-rule ordinance supersedes a conflicting state statute," while in matters of statewide or mixed concern a conflicting state law prevails, though a local ordinance "may coexist" with a state statute where the two do not conflict (id., paragraphs 17 and 18).

A home-rule city's sales and use tax is enacted in its own code, and not every home-rule city chooses to collect it. Some have the Department collect their tax, and those cities sit inside the state-administered layer described above. The cities that keep collection for themselves, dozens of them, license retailers, receive returns, audit and assess under their own ordinances.

The practical consequence is that the city's code, not the state statute, answers the tax question. City of Boulder v. Leanin' Tree, Inc., 72 P.3d 361 (Colo. 2003), began with a city audit and use tax assessment, moved to a protest hearing before the city manager's office, and reached district court only after the city denied the protest. The Supreme Court decided the case under Boulder's own tax code, which imposed the tax and defined tangible personal property in its own terms, and referred to state law only for comparison, observing that the ordinance, "like the corresponding state statute, provides no more express guidance" for an inseparably mixed transaction. Its holding was that the transactions did "not constitute transactions for the sale or use of tangible personal property within the contemplation of Boulder's tax code." (The library's article on the true object test discusses the merits of that holding.) A later Denver lodging tax case put the method in a sentence: "Like state statutes, city ordinances are a form of legislation and therefore have meaning according to the intent of the enacting body, as that intent is expressed in the language the enacting body has chosen for the particular ordinance itself" (City and County of Denver v. Expedia, Inc., 2017 CO 32, paragraph 14, in an opinion announcing the judgment joined by two other justices). That case, the opinion said, turned "entirely on the interpretation of the Denver lodger's tax article" (id., paragraph 13).

For a retailer, that means a home-rule city's definitions, exemptions, special rates and use tax provisions are read from the city's code. The SUTS FAQ notes that some home-rule cities impose special rates on categories "such as food, marijuana, etc.," and that sales in those categories cannot be reported through SUTS. A business's own purchases are also within reach: a self-collecting city's use tax applies to the business as a consumer, on terms the city sets, whether or not the business holds any city license as a seller.

What SUTS changes and what it leaves alone

The electronic sales and use tax simplification system is created in C.R.S. 39-26-802.7 (as HB24-1041 identifies it). The 2019 act that set it in motion (SB19-006, Session Laws 2019, ch. 105) required the Department to accept returns and payments through the system for state tax and the local taxes it collects, and stated the General Assembly's intent that home-rule jurisdictions use it voluntarily. A 2023 act (HB23-1017, Session Laws 2023, ch. 365, effective August 7, 2023) directed improvements, including display of a retailer's local account number on returns and reports where the retailer has one and enters it in SUTS.

The Department's list of participating jurisdictions marks the home-rule, self-collecting cities that have agreed to receive returns through SUTS. For a non-participating self-collecting city, the page states that the retailer "must remit appropriate sales and use tax directly to the jurisdiction." Some participating cities can also receive a use tax return through SUTS because they use a combined sales and use tax return, while state-administered jurisdictions cannot receive use tax returns there (SUTS participating jurisdictions page).

SUTS is a filing and payment channel, not a registration. Its FAQ answers the licensing question directly. "Local sales tax and business licensing requirements vary," and whether a local license is required depends on factors such as the nature of the business and whether it has locations or employees in the jurisdiction. The retailer is responsible for determining whether its activity in a local jurisdiction "requires a local license or registration prior to engaging in that activity." Filing through SUTS does not require a local license first, and local jurisdictions may use the information a retailer provides in SUTS to contact it about local licenses or other local requirements (SUTS portal FAQ). A retailer that files a participating city's return through SUTS without the city's license has paid the tax but may still be out of compliance with the city's licensing ordinance, and has given the city the information to find it.

Remote sellers and the physical presence line

At the state level, a retailer with no physical location in Colorado is exempt from licensing and collection if its Colorado retail sales are under $100,000 in both the current and the previous calendar year. All retail sales count toward the threshold, taxable or not, and a retailer that crosses it must be licensed and collecting by the first day of the first month beginning at least 90 days afterward (Sales Tax Guide, Part 4).

Home-rule cities do not share a single threshold, and the General Assembly addressed the cities outside SUTS in 2024. HB24-1041 added the rule, now C.R.S. 29-2-209(2) after SB24-025 relocated it effective July 1, 2025: "A home rule city, town, and city and county that collects its own sales and use tax and does not use the electronic sales and use tax simplification system created in section 39-26-802.7 shall not collect sales and use tax from a retailer that does not have physical presence in the state unless the retailer elects to collect and remit sales and use tax or enters into a voluntary collection agreement with a home rule city, town, or city and county." The act took effect August 7, 2024.

Three features of the subsection shape its use. First, the test is physical presence "in the state," not in the city. A retailer with one Colorado warehouse, store or employee anywhere is outside the subsection's protection, and every non-participating self-collecting city may apply its own ordinance to that retailer's deliveries. Second, the restriction applies only to cities that do not use SUTS; for a participating city, whether a remote retailer must collect turns on the city's own ordinance. Third, the subsection does not itself define physical presence, and the retailer's election or a voluntary agreement opens collection again. How a court would weigh section 29-2-209(2) against a city's article XX authority, under the local, statewide and mixed concern framework in Longmont, is a question this article does not resolve; no decision applying it was found.

An illustration

A furniture retailer based in another state opens one showroom in a Colorado self-collecting home-rule city and delivers to customers across the state. It obtains a state license for the showroom and files the state return, which carries state tax and every state-administered county, city and district tax on deliveries sourced to those jurisdictions. The showroom city requires its own license and return under its own code, filed through SUTS if the city participates and directly if it does not, and the city's use tax may reach fixtures and supplies the retailer buys for its own use there if the city's code so provides. Deliveries into other self-collecting cities raise a separate question for each one. Because the retailer has physical presence in Colorado, section 29-2-209(2) does not shield it from any of them; each city's licensing and collection ordinance decides whether the deliveries are taxable there and whether the retailer must be licensed.

A second retailer, with one fact changed, has no Colorado location and sells $400,000 a year into the state online. It holds a state license because it crossed the $100,000 threshold. A self-collecting city outside SUTS may not collect from it unless it elects to collect. A participating city may require collection if its ordinance reaches remote sellers, and the retailer can file that city's return through SUTS, while the city's license requirement remains a separate question under the city's code.

Audits and disputes run through the city

A self-collecting city audits under its own code, and the first appeal is usually local, as Leanin' Tree shows. The Department's hearings section also hears "taxpayer appeals of local and home rule tax decisions" (Colorado Department of Revenue, Tax Hearings page). That option is statutory and applies uniformly statewide, home-rule cities included: the city's deficiency notice must state the right, and the taxpayer must request the state hearing within 30 days after exhausting local remedies (C.R.S. 29-2-302, which replaced C.R.S. 29-2-106.1 on July 1, 2025). Breckenridge Town Code section 3-2-43, for example, allows a taxpayer to elect "a hearing before the executive director of the Department of Revenue or a delegate thereof," requires the town's deficiency notice to state that right, requires the taxpayer first to exhaust local remedies, and requires the request "within thirty (30) days after the taxpayer's exhaustion of local remedies."

The same separation applies to remediation. A state voluntary disclosure agreement is made with the Department, which does not administer a self-collecting city's tax; the city resolves its own exposure under its own code. The library's article on estimating multistate sales tax exposure treats that gap in more detail.

Practice notes

The first question for any Colorado seller is which jurisdictions its sales reach and, for each, who collects: the Department, for state tax and state-administered local taxes, or the city itself. DR 1002 and the SUTS participating jurisdictions list answer the collection question; only the city's code answers the license, base and rate questions. A state license, a clean state return and a marketplace facilitator's collection of state-administered taxes leave every self-collecting city untouched. For a retailer with any physical presence in Colorado, the sound sequence is a city-by-city review of each self-collecting city where it has a location or makes deliveries, local licenses where the codes require them, and SUTS filing for the participating cities, with direct filing for the rest and for special-rate categories SUTS cannot carry. For a retailer with no Colorado presence, section 29-2-209(2) narrows the review to the SUTS-participating cities and those with which it elects or agrees to collect. Use tax on a business's own purchases is a separate city-by-city question that a seller's license does not answer. A deficiency notice from a self-collecting city is answered under that city's code, with the state hearing option in view and its 30-day window under C.R.S. 29-2-302. G&G State Tax Group provides Colorado state and home-rule city sales and use tax registration reviews and audit representation alongside its state and local tax practice.