Colorado LLC Name Rules: What You Need to Know

Filing fee: $50 (online filing with the Colorado Secretary of State)

Processing time: Typically 1–2 business days for online filings

State agency: Colorado Secretary of State — Business Organizations Division

Annual report due: Periodic report due annually by the end of the LLC's anniversary month

State tax rate: Colorado state income tax rate: 4.4% (flat rate for pass-through income reported on personal returns)

Colorado's LLC naming rules require your business name to include an approved entity identifier, be distinguishable from all other names on file with the Colorado Secretary of State, and avoid implying a purpose your LLC isn't authorized to carry out. Colorado doesn't layer on many extra restrictions beyond those core requirements.

Required entity identifier

Every Colorado LLC name must include a term or abbreviation that signals it's a limited liability company. The Colorado Secretary of State accepts several formats, and you can use any one of them.

• Limited Liability Company
• Limited Liability Co.
• Ltd. Liability Company
• Ltd. Liability Co.
• Limited Company
• LLC
• L.L.C.
• LC
• L.C.

The words "limited" or "ltd." on their own don't satisfy this requirement — they need to appear as part of one of the full approved phrases above.

Name distinguishability

Your LLC name must be distinguishable from every other business entity already on file with the Colorado Secretary of State — not just other LLCs, but corporations and other entity types too. Colorado's distinguishability check applies across all entity types on record.

One thing that catches people off guard: Colorado counts the entity identifier as part of the name for distinguishability purposes. That means "ABC Widgets, LLC" is considered distinguishable from "ABC Widgets, Limited" — the different designator is enough. But it also means you can't rely on a designator swap alone to clear a name that's otherwise identical to an existing one.

Punctuation and abbreviation variants

Colorado ignores certain punctuation marks and capitalization differences when deciding whether two names are distinguishable. Periods, commas, underscores, apostrophes, and inverted apostrophes don't create a unique name on their own. Neither do differences in uppercase and lowercase letters.

In practice, this means "ABC Widgets LLC" and "ABC Widgets, LLC" are treated as the same name. Adding or removing a comma before the designator won't make your name available if the base name is already taken.

How to search for Colorado LLC name availability

Before filing, search the Colorado Secretary of State's Business Organizations database to check whether your preferred name is available. The Colorado Secretary of State offers 2 search tools: a general business database search and a Name Availability Search.

• General business database search: search by name, ID number, trademark, or trade name to see existing records and identify names that are identical or similar to yours
• Name Availability Search: tells you whether a specific proposed name is available, though it doesn't show similar names — use both tools together for a thorough check

To run the search, go to the Colorado Secretary of State Business Search portal, choose your search type, enter your proposed name, and review the results. A name that clears the state database still needs a trademark check — state availability doesn't mean the name is free of federal trademark conflicts.

How to reserve a Colorado LLC name

If you've found an available name but aren't ready to file yet, the Colorado Secretary of State lets you reserve it for 120 days. File a Statement of Reservation of Name through the Secretary of State's online Business Organizations system. The reservation holds the name while you finish preparing your Articles of Organization.

Colorado trade names (DBA)

Your LLC can do business under a name that's different from its legal name. In Colorado, this is called a trade name — sometimes referred to as a DBA (doing business as) in other states. You register a trade name separately with the Colorado Secretary of State through the Business Organizations system.

A trade name is useful if you want to market under a shorter or different brand name without forming a separate legal entity. The trade name still needs to be distinguishable from other names on file with the Secretary of State.

Trademarks and service marks

State name availability and federal trademark protection are separate systems. A name can be available in Colorado's database and still infringe on a federally registered trademark. Before settling on a name, search the USPTO's trademark database at uspto.gov to check for conflicts. If another business holds a trademark on a similar name in your industry, using it can put you on the hook for infringement claims even if the state approved your filing.

Registering your name in the Articles of Organization

When you file your Colorado Articles of Organization, the LLC name is the first field you'll fill in. The name you enter must include an approved entity identifier, be distinguishable from all names on record, and not falsely imply a purpose your LLC isn't authorized to carry out.

If you filed with a name that's missing the required entity identifier, you can correct it by filing a Statement of Correction, Statement of Change, or Articles of Amendment — the right form depends on your situation. It's worth getting the name right before you file rather than correcting it after.