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The simple route · Colorado

3 Best Foreign Registration Services in Colorado (2026) and What to Check

In Colorado for 2026, compare Mainstay Filing ($199), CO Registered Agent.org ($199) and Colorado Registered Agent.co ($199), ranked best first. Plan on $100 for the state and $397 to $497 in service fees across three years.
Written by the Simple Filing Guide editorial team

Quick guide

Fee at the state
$100
Attach a certificate?
Not needed
Later on
$25, periodic report
Our shortlist
Mainstay Filing, CO Registered Agent.org then Colorado Registered Agent.co

Colorado: the ranking

Want to know why this order? See how we rank.

#1 Start here

1. Mainstay Filing: best for your second, third and fourth state

$199 plus the state fee, then $149 a year

Mainstay Filing is our first recommendation because $199 over the state fee registers you, with the registered agent free in year one and $149 a year after.

Choosing CO Registered Agent.org would save $100 over three years, with the limit that it covers one state.

Every state charges the same $149 a year for the registered agent after year one.

Checklist: what is included
  • Your foreign filing, submitted
  • Registered agent, no charge in the first year
  • A flat nationwide fee
What works
  • $199 on top of Colorado's fee
  • One fee for any state
  • A free first year of agent service
Gaps
  • CO Registered Agent.org renews its agent $50 lower
Go to Mainstay Filing Partner link. We may earn money if you buy.
#2 For Colorado filers

2. CO Registered Agent.org: best for one extra state

$199 plus the state fee, then $99 a year

Next, consider CO Registered Agent.org: registering costs $199 over the state fee, agent covered in year one, then $99 a year.

Checklist: what is included
  • Colorado registration filing
  • No agent charge in year one
What works
  • Then $99 annually
  • Year one of the agent comes with it
  • Registers you for $199
Gaps
  • Nothing outside this state
Go to CO Registered Agent.org Partner link. We may earn money if you buy.
#3 For Colorado filers

3. Colorado Registered Agent.co: best for another local choice

$199 plus the state fee, then $99 a year

Next, consider Colorado Registered Agent.co: registering costs $199 over the state fee, agent covered in year one, then $99 a year.

Both publish identical prices, so pick whichever you like better.

Checklist: what is included
  • Colorado registration filing
  • No agent charge in year one
What works
  • Then $99 annually
  • Registers you for $199
  • Year one of the agent comes with it
Gaps
  • Nothing outside this state
Go to Colorado Registered Agent.co Partner link. We may earn money if you buy.

Cost check

#CompanyFirst-year priceAt renewalTotal for 3 yearsIncluded
1 Mainstay Filing $199$149/yr$497your foreign filing, submitted; registered agent, no charge in the first year; A flat nationwide fee Go to Mainstay Filing Partner link. We may earn money if you buy.
2 CO Registered Agent.org $199$99/yr$397colorado registration filing; no agent charge in year one Go to CO Registered Agent.org Partner link. We may earn money if you buy.
3 Colorado Registered Agent.co $199$99/yr$397colorado registration filing; no agent charge in year one Go to Colorado Registered Agent.co Partner link. We may earn money if you buy.

Each company's listed prices on November 13, 2026. State fees are extra and do not vary by pick.

Step by step

Is my LLC obliged to register here?

If your LLC was formed in another state and will operate in Colorado, register first.

The cost of skipping it includes a fine as high as $5,000.

verify at coloradosos.gov, as of October 2026

How much does registration cost?

Doing it yourself costs $100. With a service, add $199.

Across three years the state's total comes to $150. verify at coloradosos.gov, as of October 2026

Where does the registration go?

File the Statement of Foreign Entity Authority with the Colorado Secretary of State, Business Program. That single filing registers the LLC.

This state does not ask for a certificate from your home state.

What do I owe once registered?

Add the periodic report to your calendar ($25).

The state sets the deadline at once a year, by the end of the second month after your report month.

Why is number one first?

Filing jobs included (27% of the score) is where Mainstay Filing does best.

Total for three years is worth 37% and filing jobs included 27%, with three smaller checks breaking ties.

Because two states are involved, a company that works everywhere ranked above CO Registered Agent.org.

How we rank

What Colorado requires to register

StepWhat to knowVerify
Application fee $100verify at coloradosos.gov, as of October 2026
Document from home Not neededverify at coloradosos.gov, as of October 2026
Periodic report $25verify at coloradosos.gov, as of October 2026
Paid to the state by year three $150Rows above, added up

Every amount above links to its official source. The last row is our own total of the filing, two reports and any minimum tax, without variable costs like publication.

More questions

Do both states require an agent?

Keep one at home. Mainstay Filing serves both states, and a local company serves only one.

How do the three-year costs compare?

Mainstay Filing $497; CO Registered Agent.org $397; Colorado Registered Agent.co $397 for the services alone.

What are the numbers based on?

Official Colorado sources back the state side and company pricing backs the service side, all dated.

Is a service required by law?

No. You can file with the state yourself; a service saves time and can act as your agent, but nothing makes you hire one.

Is filing part of the service?

Yes. Every pick prepares and files it, and the state fee is the same whichever you choose.

Which foreign registration service should I start with in Colorado?

Choose Mainstay Filing first, then compare CO Registered Agent.org and Colorado Registered Agent.co.

Where each fact comes from

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