Skip to content
LLC PlainlyThe LLC stuff, in words you actually use.

Keep it simple · Colorado

3 Best Foreign Registration Services in Colorado (2026) for Real People

We'd line up the foreign registration services in Colorado for 2026 as Mainstay Filing ($199), Colorado Registered Agent.co ($199) and CO Registered Agent.org ($199), in that order. You'll pay the state $100 to register whoever files, plus $397 to $497 in service fees across three years.
From the LLC Plainly editorial team

Quick take

You pay the state
$100
Proof of good standing?
Not needed
After that
$25, periodic report
Our picks
Mainstay Filing, Colorado Registered Agent.co then CO Registered Agent.org

Who we'd use in Colorado

Ranked best first using the checks on our method page.
Best overall

1. Mainstay Filing: best for companies that keep growing

Registration is $199 plus the state fee, and the agent is $149 later

We'd use Mainstay Filing in Colorado. It charges $199 plus state fees and waives the registered agent for the first year.

Over three years you'd pay $100 more than with Colorado Registered Agent.co, and that buys service in every state.

Starting in year two, the registered agent runs $149 a year.

Your money buys

  • Your registration, filed
  • Registered agent, free in year one
  • Fifty states, one fee

The good

  • A free first year of agent service
  • Fifty states covered
  • Registers you for $199

Trade-offs

  • Its agent renewal of $149 is $50 higher than Colorado Registered Agent.co
Colorado only

2. Colorado Registered Agent.co: best for a lean registration

Registration is $199 plus the state fee, and the agent is $99 later

Colorado Registered Agent.co takes second, because registering costs $199 above the state fee and the agent is covered in year one, then $99 a year.

Your money buys

  • State registration done
  • No agent charge in year one

The good

  • Just $199 to register
  • Agent covered in year one
  • Year two onward: $99

Trade-offs

  • Nothing outside this state
Colorado only

3. CO Registered Agent.org: best for a one-state add-on

Registration is $199 plus the state fee, and the agent is $99 later

CO Registered Agent.org takes third, because registering costs $199 above the state fee and the agent is covered in year one, then $99 a year.

Price for price, it ties Colorado Registered Agent.co.

Your money buys

  • State registration done
  • No agent charge in year one

The good

  • Year two onward: $99
  • Agent covered in year one
  • Just $199 to register

Trade-offs

  • Nothing outside this state

Compared

#ServiceFirst yearRenewalThree-year totalWhat you get
1Mainstay Filing$199$149/yr$497your registration, filed; registered agent, free in year one; fifty states, one feeHead to Mainstay FilingPartner link. We may earn money if you buy.
2Colorado Registered Agent.co$199$99/yr$397state registration done; no agent charge in year oneHead to Colorado Registered Agent.coPartner link. We may earn money if you buy.
3CO Registered Agent.org$199$99/yr$397state registration done; no agent charge in year oneHead to CO Registered Agent.orgPartner link. We may earn money if you buy.
Each company's listed prices on November 13, 2026. State fees come on top and don't change by pick.

Your questions, answered

Who has to register in this state?

You register with the Colorado Secretary of State, Business Program before your LLC starts doing business in Colorado.

Without registration, you may see fines up to $5,000.

check it at coloradosos.gov, October 2026

How much should I put aside to register?

State fee $100; service $199 extra.

Add up the state's fees across three years and it's $150. check it at coloradosos.gov, October 2026

What's the application called?

You file the Statement of Foreign Entity Authority with the Colorado Secretary of State, Business Program. That's the whole filing.

The state doesn't ask for a certificate from your home state.

Is there anything to file once I'm registered?

You'll file a periodic report on schedule ($25).

Mark the date: once a year, by the end of the second month after your report month.

What put number one on top?

It's work taken off your hands (31% of the score), and Mainstay Filing does best there.

33% of the score is cost across three years, 31% is work taken off your hands, and three smaller checks split ties.

Your home state wants an agent too, and one account for both states is easier.

Our method, in full

Colorado checklist

The ruleDetailsOfficial source
State filing fee$100check it at coloradosos.gov, October 2026
Proof of existenceNot neededcheck it at coloradosos.gov, October 2026
Periodic report$25check it at coloradosos.gov, October 2026
State fees, years one to three$150Added from the rows
How we get the bottom line: filing + report in year two + report in year three + any minimum tax. Open-ended costs are described in the text only.

FAQ

Is one agent enough for both states?

You do. Two states mean two sets of rules, and a one-state company stops at its border while Mainstay Filing keeps going.

What does each one cost over three years?

Three-year totals are Mainstay Filing, $497; Colorado Registered Agent.co, $397; CO Registered Agent.org, $397, with state fees extra.

What are the sources?

What the state charges comes from official Colorado publications; what services charge comes from what they publish.

Do I need to hire a service?

No law says you must hire anyone.

Who actually submits the registration?

Yes, because filing is what these companies sell, and the state fee stays put.

Who tops the list in Colorado?

Start with Mainstay Filing, followed by Colorado Registered Agent.co and CO Registered Agent.org.

Check our work

  1. Colorado Secretary of State, sos.state.co.us (confirmed August 2026)
  2. Colorado Secretary of State, sos.state.co.us (confirmed August 2026)
  3. Colorado yearly filing: Periodic report, coloradosos.gov (confirmed October 2026)
  4. Colorado report due date, colorado.public.law (confirmed August 2026)
  5. Colo, sos.state.co.us (confirmed August 2026)
  6. Colorado formation fee: Filing fee, coloradosos.gov (confirmed October 2026)
  7. Colorado Secretary of State, foreign, coloradosos.gov (confirmed October 2026)
  8. Sample Statement of Foreign Entity, coloradosos.gov (confirmed October 2026)
  9. Colorado Revised Statutes 2024, Title, content.leg.colorado.gov (confirmed October 2026)
  10. Registered agent requirements effective July, coloradosos.gov (confirmed October 2026)
  11. Mainstay Filing's Colorado service page, as of November 13, 2026
  12. Colorado Registered Agent.co's pricing page, as of November 13, 2026
  13. CO Registered Agent.org's pricing page, as of November 13, 2026