To form a single-member LLC in Colorado, you file Articles of Organization online with the Colorado Secretary of State and pay a $50 filing fee. The filing itself takes a few minutes once you have your information ready, and your LLC exists the moment the system accepts it. The work that matters more for protecting the business happens before and after that filing: picking a compliant name, setting up a registered agent, writing an operating agreement, getting a federal tax ID, and committing to the annual report that keeps your LLC in good standing.
What You Need Before You File
Gather these details first so you can complete the online form in one sitting.
A Compliant Business Name
Your LLC name has to be distinguishable from every other entity name already on file with the Secretary of State, and it must include a recognizable identifier such as “limited liability company,” “LLC,” “L.L.C.,” or “Ltd.”1Justia. Colorado Code 7-90-601 – Entity Name Run your proposed name through the Secretary of State’s Name Availability Search before you file.2Colorado Secretary of State. Name Availability Search
A Registered Agent
Every Colorado LLC must continuously maintain a registered agent in the state to receive legal papers and official notices. The agent must be an individual whose primary residence or usual place of business is in Colorado, or a business entity with a Colorado presence.3Justia. Colorado Code 7-90-701 – Registered Agent – Definition You can serve as your own registered agent if you have a physical Colorado address and are generally available there during business hours. Commercial registered agent services typically run $49 to $300 per year and keep your home address off the public filing.
Two Addresses and a Management Choice
The form asks for the principal office address where the business actually operates and a mailing address for correspondence from the Secretary of State.4Colorado Secretary of State. Articles of Organization You will also pick member-managed or manager-managed. For a single-member LLC, member-managed is the typical choice and simply means you run the business directly.
An Organizer
The organizer is the person who submits the Articles and signs to affirm the information is accurate. The organizer does not have to be the LLC’s owner, but for a single-member LLC it usually is. Any individual age eighteen or older can serve.5Colorado Secretary of State. What You Need to File Articles of Organization for a Limited Liability Company (LLC)
Filing the Articles Online
Colorado accepts Articles of Organization only through its online portal. There is no paper option.6Colorado Secretary of State. Business Organizations Fee Schedule Go to the Secretary of State’s business filing page and select Articles of Organization for a Limited Liability Company.7Colorado Secretary of State. File a Business Document The system walks you through each field.
Pay the $50 fee by credit card or through a prepaid account with the Secretary of State’s office.6Colorado Secretary of State. Business Organizations Fee Schedule Once payment goes through, the system generates a confirmation immediately. From the business portal you can download certified copies of your Articles of Organization and a Certificate of Fact of Existence.8Colorado Secretary of State. Business Information You will need both when opening a business bank account and signing contracts.
Write an Operating Agreement
Colorado does not require you to file an operating agreement with the state, and new owners often skip it. For a single-member LLC that is a mistake. The operating agreement is your primary evidence that the business is a separate entity and not just you under a different name, and courts look for it when deciding whether your liability protection holds up.
Under Colorado law, the operating agreement governs the rights, duties, and relations among the members, managers, and the LLC itself. Where it is silent, default rules in the Colorado Limited Liability Company Act fill the gaps. The statute explicitly prioritizes “freedom of contract and the enforceability of operating agreements.”9Justia. Colorado Code 7-80-108 – Operating Agreement
For a single-member LLC, the document can be short. At a minimum it should document your 100% ownership, how profits and losses are allocated, how the LLC is managed, what happens if you become incapacitated or pass away, and the procedures for dissolving the business. You can sign it before, at the same time as, or after you file the Articles.9Justia. Colorado Code 7-80-108 – Operating Agreement Keep the signed copy in your business records.
Get an EIN and Handle Taxes
The IRS treats a single-member LLC as a “disregarded entity” by default, so the LLC itself does not file a separate federal tax return. You report the LLC’s income and expenses on Schedule C of your personal Form 1040. You can elect corporate tax treatment by filing Form 8832, but most single-member owners stick with the default.10Internal Revenue Service. Single Member Limited Liability Companies
A single-member LLC is not strictly required to get an Employer Identification Number unless it has employees or files excise tax returns. Even so, most banks require an EIN to open a business account, and using one keeps your Social Security number off paperwork that vendors and clients see. The IRS online EIN application is free, takes about ten minutes, and issues the number immediately.11Internal Revenue Service. Get an Employer Identification Number
If your LLC will sell tangible goods or taxable services in Colorado, register with the Colorado Department of Revenue by filing a sales tax account application. State income tax accounts for pass-through entities are established when you file your first state return, so no separate registration step is needed there.
File a Periodic Report Every Year
Once your LLC exists, keep it in good standing by filing a Periodic Report each year with the Secretary of State.12Justia. Colorado Code 7-90-501 – Periodic Reports The report confirms or updates your principal office address, registered agent, and other basic details.13Colorado Secretary of State. Business FAQs – Periodic Reports It costs $25 to file online.6Colorado Secretary of State. Business Organizations Fee Schedule
Your filing window is tied to the periodic report month shown on your entity’s summary page. You can file starting two months before that month and have until two months after without penalty, a five-month window in total.13Colorado Secretary of State. Business FAQs – Periodic Reports Put a calendar reminder well inside that window instead of relying on state email notices.
What Happens If You Miss the Periodic Report
Missing the window does not immediately destroy your LLC, but the consequences escalate. Your entity status shifts to “Delinquent,” which can affect your ability to enforce contracts, secure financing, or prove to vendors and partners that your business is in good standing.13Colorado Secretary of State. Business FAQs – Periodic Reports
The state holds your LLC’s name for 400 days after the delinquency date. On the 401st day, the Secretary of State changes your entity name to include the word “delinquent” and the date, and your original name becomes available for someone else to register.14Colorado Secretary of State. Business FAQs – Delinquency
If your LLC has been delinquent less than five years, you can restore good standing by filing a Statement Curing Delinquency. If the delinquency has lasted five years or longer, you will also need to submit the curing statement under penalty of perjury, an affidavit confirming your authority to act for the entity, and a copy of your government-issued photo ID.14Colorado Secretary of State. Business FAQs – Delinquency Staying current on the $25 annual report is cheaper than any of this.
Federal Beneficial Ownership Reporting
You may have heard that most LLCs have to file Beneficial Ownership Information (BOI) with the Financial Crimes Enforcement Network under the Corporate Transparency Act. As of March 2025, FinCEN issued an interim final rule exempting all entities formed in the United States from BOI reporting.15FinCEN.gov. Beneficial Ownership Information Reporting A Colorado single-member LLC has no federal BOI filing obligation at this time. Only entities formed under foreign law and registered to do business in a U.S. state remain covered.16FinCEN.gov. FinCEN Removes Beneficial Ownership Reporting Requirements for US Companies and US Persons The rule could change through future rulemaking, so check the FinCEN page before you assume it still applies.