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Do it right · Colorado

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

In Colorado for 2026, compare Colorado Registered Agent.co ($199), Mainstay Filing ($199) and CO Registered Agent.org ($199), ranked best first. Budget $50 for Colorado and $397 to $597 for service fees over three years.
Written by the Simple Filing Guide editorial team

Four facts to know

What you pay the state
$50, a single payment
Ongoing
$25 per year
Registered agent
Yes: the state requires it
Where to start
Colorado Registered Agent.co, Mainstay Filing then CO Registered Agent.org

Where to start in Colorado

Ranked best first using the checks described on the method page.

#1 Start here

1. Colorado Registered Agent.co: best for a lean launch

Pay $199 to form and $99 each year after

Colorado Registered Agent.co takes the top spot, since $199 forms the LLC, and the agent renews each year at $99.

Compare the three-year totals: it lands under Mainstay Filing, and cost is the check we weigh most.

Put the periodic report on your own calendar.

Checklist: what is included
  • State filing completed
  • First-year agent
What works
  • $99 a year from year two
  • Only $199 to form
  • Year one of the agent comes with it
Gaps
  • Not included: the periodic report
  • They charge $99 to apply for your EIN
Start with Colorado Registered Agent.co Partner link. We may earn money if you buy.
#2 Works in every state

2. Mainstay Filing: best for not having to file the periodic report

$199 yearly ($249 at signup, state fee included)

In second place, Mainstay Filing, where a single price of $199 a year includes the formation, the registered agent and each periodic report.

At $200 above Colorado Registered Agent.co over three years, it sits lower in the ranking.

You skip the periodic report; Colorado still charges $25, billed to you at cost.

Checklist: what is included
  • LLC formation filed with the state
  • Registered agent for the whole year
  • Periodic report filed on time
  • Help with your EIN
  • State fees billed as charged
What works
  • No extra fee to get your EIN
  • Stays at $199 at renewal
  • Price is fixed at $199 a year
Gaps
  • Costs $100 extra each year after the first
Start with Mainstay Filing Partner link. We may earn money if you buy.
#3 One-state pick

3. CO Registered Agent.org: best for owners who do their own reports

Pay $199 to form and $99 each year after

Why CO Registered Agent.org third? Because $199 forms the LLC, and the agent renews each year at $99.

Put the periodic report on your own calendar.

Its prices match Colorado Registered Agent.co exactly, so compare service before you choose.

Checklist: what is included
  • State filing completed
  • First-year agent
What works
  • $99 a year from year two
  • Year one of the agent comes with it
  • Only $199 to form
Gaps
  • Not included: the periodic report
  • They charge $99 to apply for your EIN
Start with CO Registered Agent.org Partner link. We may earn money if you buy.

The table

#ProviderFirst-year priceAt renewal3-year totalWhat is covered
1 Colorado Registered Agent.co $199$99/yr$397state filing completed; First-year agent Start with Colorado Registered Agent.co Partner link. We may earn money if you buy.
2 Mainstay Filing $199$199/yr$597LLC formation filed with the state; registered agent for the whole year; periodic report filed on time Start with Mainstay Filing Partner link. We may earn money if you buy.
3 CO Registered Agent.org $199$99/yr$397state filing completed; First-year agent Start with CO Registered Agent.org Partner link. We may earn money if you buy.

These are service fees only, taken from each company's prices on November 13, 2026. State fees stay the same with every pick.

What to know before you file

How much should I budget to form an LLC here?

$50 goes to the state, and a service adds $199.

Total the state's fees from filing through year three: $100. coloradosos.gov, last confirmed October 2026 for this guide

Which form do I file, and where does it go?

Submit the Articles of Organization to the Colorado Secretary of State and wait for approval.

coloradosos.gov, last confirmed October 2026 for this guide

Must I name a registered agent?

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

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.

sos.state.co.us, last confirmed October 2026 for this guide

What do I owe in later years?

Set aside $25 each year for the periodic report. Write down the state's date, last day of the entity's anniversary month.

A late report costs $50 more.

coloradosos.gov, last confirmed October 2026 for this guide

Can I file it myself instead of hiring a service?

A service is optional. State fees alone would run $100 across three years.

The $397 to $597 that services charge over three years pays for the paperwork and the agent role.

Why is the list in this order?

Colorado Registered Agent.co leads on total for three years, which carries 37% of our score.

Five checks set the order: total for three years (37%), filing jobs included (27%), clear price information (13%), year-two price (12%) and state coverage (11%).

Choose Colorado Registered Agent.co over Mainstay Filing and keep $200 across three years.

How we rank

Colorado formation rules at a glance

ItemAmount or ruleWhere it is from
LLC filing fee $50coloradosos.gov, last confirmed October 2026 for this guide
Registered agent Yes: the state requires itsos.state.co.us, last confirmed October 2026 for this guide
Periodic report $25 every yearcoloradosos.gov, last confirmed October 2026 for this guide
State total, years one to three $100Rows above, added up

Last row = filing fee + report in year two + report in year three + minimum tax, if any. Variable costs are described in the text, not added.

Related questions

What about the EIN?

It is free at Mainstay Filing. The remaining picks charge $99 (Colorado Registered Agent.co), $99 (CO Registered Agent.org).

Is there a late fee?

Colorado adds $50 for lateness.

Over three years, what does each charge?

$397 for Colorado Registered Agent.co, $597 for Mainstay Filing, $397 for CO Registered Agent.org, with state fees on top.

Are the fees official?

State-set fees come from Colorado's publications; what services charge comes from the prices they post.

Do I need to hire a service?

No. A service charges for labor and the agent role, not for anything the state demands.

Who ranks first in Colorado?

Colorado Registered Agent.co comes first: the opening price is $199 with the first agent year included, then $99 annually. Next, Mainstay Filing and CO Registered Agent.org.

Verify these facts

  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. pricing page from Colorado Registered Agent.co, checked November 13, 2026
  8. Colorado service page from Mainstay Filing, checked November 13, 2026
  9. pricing page from CO Registered Agent.org, checked November 13, 2026