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Biz Formation Report

Rankings of registered agents, LLC formation and foreign registration services in all 50 states.

Foreign registration report · Colorado

3 Best Foreign Registration Services in Colorado (2026)

By the Biz Formation Report editorial team

Biz Formation Report ranks foreign registration services in Colorado for 2026 as CO Registered Agent.org ($199), Mainstay Filing ($199) and Colorado Registered Agent.co ($199), in that order. CO Registered Agent.org earns the top grade: $199 plus the state fee, one year of registered agent service included, then $99 a year for the agent.

No.1

Our top pick

1. CO Registered Agent.org: best for companies adding Colorado alone

Score9.2out of 10
$199 plus the state fee, then $99 a year for the agent from year two

Top grade, CO Registered Agent.org: the Colorado registration for $199 with year-one agent service included, then $99 a year.

The plan seats the company at an in-state street address and posts scans of papers served there to your online account.

Over three years it costs less than Mainstay Filing, and cost is one of our two heaviest criteria.

What you get

  • Registration prepared and filed
  • Registered agent service for year one

Good

  • First-year registered agent service is part of the price
  • $199 for registration, plus the state fee
  • $99 annually to keep the agent

Weak spots

  • Serves Colorado only; the home state still needs its own agent
  • The EIN application costs $99 extra
Visit CO Registered Agent.orgPartner link. We may earn money if you buy.
Read the CO Registered Agent.org review
No.2

Same price in every state

2. Mainstay Filing: best for companies registered in several states

Score8.8out of 10
A $199 service fee and the state fee ($299 today), then the agent at $149

Second grade, Mainstay Filing: the Colorado registration is filed for $199, and the registered agent is free in year one, then $149 a year.

There is no agent charge in year one; after that it is $149 a year in every state.

CO Registered Agent.org is $100 cheaper across three years, and that difference lowers Mainstay Filing's cost grade.

What you get

  • The foreign registration, done for you
  • Registered agent service free in year one
  • Legal papers served on the company scanned free, the same business day

Good

  • One price across all fifty states
  • Registered agent at no cost in year one
  • Served papers scanned within the same business day, free
  • $199 service fee plus the state's fee

Weak spots

  • The agent renews at $149, $50 more than CO Registered Agent.org
Visit Mainstay FilingPartner link. We may earn money if you buy.
Read the Mainstay Filing review
No.3

Lower renewal than Mainstay

3. Colorado Registered Agent.co: best for registering in Colorado only

Score8.6out of 10
A $199 service fee and the state fee, then the agent at $99

Third grade, Colorado Registered Agent.co: the Colorado registration for $199 with year-one agent service included, then $99 a year.

The plan seats the company at an in-state street address and posts scans of papers served there to your online account.

Colorado Registered Agent.co matches CO Registered Agent.org on price and plan features, leaving very little between them.

What you get

  • Registration prepared and filed
  • Year-one registered agent service

Good

  • Then $99 per year for the agent
  • First-year registered agent service is part of the price
  • Registration costs $199 before the state fee

Weak spots

  • Serves Colorado only; the home state still needs its own agent
  • The EIN application costs $99 extra
Visit Colorado Registered Agent.coPartner link. We may earn money if you buy.
Read the Colorado Registered Agent.co review

Summary of the 3 grades

RankProviderGradeService feeYear twoBest fitSite
1CO Registered Agent.org9.2$199$99/yrThe lowest agent renewal we rank hereVisit CO Registered Agent.orgPartner link. We may earn money if you buy.
2Mainstay Filing8.8$199$149/yrCompanies with a presence in several statesVisit Mainstay FilingPartner link. We may earn money if you buy.
3Colorado Registered Agent.co8.6$199$99/yrThe lowest agent renewal we rank hereVisit Colorado Registered Agent.coPartner link. We may earn money if you buy.

Our editors set each grade out of 10 from the weighted criteria on How we rank. Customers do not rate anything here.

Colorado foreign registration service prices, 2026: year one, renewal and three-year outlay

ProviderYear 1Year 2Year 3Three-year outlayYear-one agent covered
CO Registered Agent.org$199$99$99$397Included
Mainstay Filing$199$149$149$497Free
Colorado Registered Agent.co$199$99$99$397Included

All prices were taken from the companies' own websites on November 12, 2026. Colorado's $100 registration fee is payable on top of each row and is not part of these totals.

What decided the order

Three-year bill was the deciding factor in Colorado. The method gives three-year bill and what the money buys 32% each and splits 36% across renewal handling, local rules match and pricing openness.

Total outlay with CO Registered Agent.org over three years: $397, $100 less than Mainstay Filing. Both providers include the first agent year, so the renewal price set the order.

Every criterion and weight is listed on How we rank.

Colorado foreign LLC registration: fee, document and filing office

To register, the outside company submits the Statement of Foreign Entity Authority to the Colorado Secretary of State, Business Program, with a state fee of $100.

After registration the company owes the periodic report ($25), due once a year, by the end of the second month after your report month.

Documents to have on hand

  • The legal name as recorded in the home state, and the date of formation.
  • An in-state registered agent; any provider in this report can serve.
  • Payment of the $100 state fee with the filing.
  • The due date of the periodic report and its $25 fee, noted in your calendar.

The cost of skipping Colorado registration

Civil penalties can climb to $5,000.

Colorado foreign registration service: common questions

Must an LLC from another state register with Colorado?

Yes, as soon as it transacts business there.

How much does Colorado foreign registration cost?

$100 goes to the state and $199 to the service.

Is a registered agent still needed after foreign registration?

Yes. A registered agent with a street address in the state has to remain on file.

Which foreign registration services does this report rank?

CO Registered Agent.org ($199), Mainstay Filing ($199) and Colorado Registered Agent.co ($199), in descending order of grade.

What is filed each year after registering?

The periodic report, at $25.

What is the best foreign registration service for Colorado?

CO Registered Agent.org: $199 beyond the state fee to register in Colorado, agent renewing at $99.

Read next

Source notes

  1. Colorado Secretary of State (verified August 2026)
  2. Colorado Secretary of State (verified August 2026)
  3. Colorado yearly filing: Periodic report, official source (verified October 2026)
  4. Colorado report due date (verified August 2026)
  5. Colo. Rev. Stat. § 7-80-203 (verified August 2026)
  6. Colorado formation fee: Filing fee, official source (verified October 2026)
  7. Colorado Secretary of State, foreign entity FAQ (verified October 2026)
  8. Sample Statement of Foreign Entity Authority (verified October 2026)
  9. Colorado Revised Statutes 2024, Title 7 (verified October 2026)
  10. Registered agent requirements effective July 1, 2025 (verified October 2026)
  11. Pulled November 12, 2026: CO Registered Agent.org, pricing and service pages
  12. Pulled November 12, 2026: Mainstay Filing, Colorado service page
  13. Pulled November 12, 2026: Colorado Registered Agent.co, pricing and service pages