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Formation ClassClass is in session: LLC paperwork, state by state.

Session 2 · Colorado

Colorado Registered Agent Class (2026): 6 Assignments and the 3 Best Agents

If you want help getting a registered agent in Colorado in 2026, the top grades go to Mainstay Filing ($149 a year), Colorado Registered Agent.co ($99 a year) and CO Registered Agent.org ($99 a year), in that order. 6 assignments cover the rule, who is eligible, the address test and the filing.

Taught by the Formation Class faculty

The quick version

Must you have one?YesCheck the textbook page: sos.state.co.us (read October 2026)
Service prices$99 to $149 a yearPublished rates
Periodic report$25 a yearCheck the textbook page: coloradosos.gov (read October 2026)
Assignments in this class6In order

Class goals

  • Why Colorado wants an agent on file
  • Eligibility and address rules
  • Recording the agent
  • The agents at the top of the class

Who we would hire in Colorado

Three-year tuition and homework done weigh the most; how we grade lists all five criteria.
Top of the class

1. Mainstay Filing: best for companies working in several states

$149 a year, $149 at renewal

We start with Mainstay Filing; the agent is $149 a year and can come along when the company adds a state.

Three years here run $150 higher than at Colorado Registered Agent.co, with more of the work done in return.

Covered by the tuition

  • A real street address in the state
  • Scans of papers served on the company, free and on the same business day
  • Three government letters a year are scanned free
  • Also serves nonprofits, corporations, LPs and LLPs

Strengths

  • The same provider anywhere
  • $149 a year, same at renewal

Weak spots

  • Higher by $50 a year
  • An agent-only plan, so no report filing
Focused on Colorado

2. Colorado Registered Agent.co: best for one-state companies

$99 a year, $99 at renewal

Colorado Registered Agent.co makes a respectable second: $99 a year, unchanged at renewal, for an LLC that stays in the state.

Covered by the tuition

  • A registered office address
  • Online copies of legal papers

Strengths

  • $99 each year, no increase
  • Less each year than Mainstay Filing

Weak spots

  • No help in other states
  • No help with the periodic report
Focused on Colorado

3. CO Registered Agent.org: best for staying inside one state

$99 a year, $99 at renewal

CO Registered Agent.org makes a respectable third: $99 a year, unchanged at renewal, for an LLC that stays in the state.

On price, it is level with Colorado Registered Agent.co.

Covered by the tuition

  • A registered office address
  • Online copies of legal papers

Strengths

  • Less each year than Mainstay Filing
  • $99 each year, no increase

Weak spots

  • No help in other states
  • No help with the periodic report

The Colorado grades compared

#ServiceAnnual priceRenewal priceThree-year total
1Mainstay Filing$149$149/yr$447Visit Mainstay FilingPartner link. We may earn money if you buy.
2Colorado Registered Agent.co$99$99/yr$297Visit Colorado Registered Agent.coPartner link. We may earn money if you buy.
3CO Registered Agent.org$99$99/yr$297Visit CO Registered Agent.orgPartner link. We may earn money if you buy.
Taken from each company's price page on November 13, 2026. State fees do not change with your choice of agent.

The Colorado agent, in order

  1. Assignment
    1

    The Colorado rule in brief

    Every LLC must name a registered agent with an in-state street address.

    Textbook page: Check the textbook page: sos.state.co.us (read October 2026)

  2. Assignment
    2

    Check who is eligible

    A person 18 or older whose home or usual place of business is in Colorado (since July 1, 2025 the person has to hold a Colorado driver's license or ID or otherwise verify residency), or a business entity in good standing with a usual place of business in Colorado. The agent has to consent. The rule comes from C.R.S. § 7-90-701.

  3. Assignment
    3

    The address rule

    The address has to be a physical address in Colorado, either a home or a usual place of business. P.O. boxes are not accepted.

    Every graded service supplies the Colorado office address.

  4. Assignment
    4

    Choose between acting alone and hiring

    If you pass the tests above, you can name yourself; hiring one of the graded agents costs $99 to $149 a year.

  5. Assignment
    5

    Report the agent's details

    A new company names its agent when it files the Articles of Organization; replacing the agent later takes another filing with the Colorado Secretary of State.

    Textbook page: Check the textbook page: coloradosos.gov (read October 2026)

  6. Assignment
    6

    Watch the details

    Notices from the state about the periodic report go straight to your registered agent. You pay $25 every year, with the due date given as last day of the entity's anniversary month.

    Textbook page: Check the textbook page: coloradosos.gov (read October 2026)

Agent and state costs

What forPayeeTotal
A professional agentService$99 to $149 a year
From year twoService$99 to $149 a year
Periodic reportState office$25 every year
Here is how the three-year state row works: filing fee, plus the report in each of years two and three, plus any yearly minimum tax. Service fees get their own rows.

Why the list runs this way

pulled ahead of on homework the price does, which counts for 34%.

One agent for every state beat the one-state plan.

Common questions

Is a registered agent required in Colorado?

Yes. Every LLC must name a registered agent with an in-state street address.

Can I be my own registered agent?

Yes, when you meet the who-may-serve and address rules in assignments 2 and 3.

Can I change my registered agent later?

Change whenever you like through the Colorado Secretary of State, as assignment 5 describes.

What does a registered agent cost in Colorado?

$99 to $149 per year for the agents listed.

What does the LLC pay the state each year?

$25 every year for the periodic report.

Which registered agent would you choose?

Pick Mainstay Filing: a flat $149 a year, whichever state the LLC sits in. Then Colorado Registered Agent.co and CO Registered Agent.org.

More classes

Textbook pages and extra reading

  1. Class notes on Colorado Secretary of State come straight from sos.state.co.us (reread August 2026).
  2. Class notes on Colorado Secretary of State come straight from sos.state.co.us (reread August 2026).
  3. Class notes on Colorado yearly filing: Periodic report, official source come straight from coloradosos.gov (reread October 2026).
  4. Class notes on Colorado report due date come straight from colorado.public.law (reread August 2026).
  5. Class notes on Colo come straight from sos.state.co.us (reread August 2026).
  6. Class notes on Colorado formation fee: Filing fee, official source come straight from coloradosos.gov (reread October 2026).
  7. Tuition figures from Mainstay Filing (Colorado service page), November 13, 2026
  8. Tuition figures from Colorado Registered Agent.co (pricing page), November 13, 2026
  9. Tuition figures from CO Registered Agent.org (pricing page), November 13, 2026