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Straight talk · Colorado

3 Best LLC Services in Colorado (2026) for Real People

For LLC formation services in Colorado, here is our 2026 ranking: CO Registered Agent.org ($199), Mainstay Filing ($199) and Colorado Registered Agent.co ($199). You'll pay the state $50 to file no matter who does it, and the services cost $397 to $597 over three years.
From the LLC Plainly editorial team

The gist

What the state charges
$50, once
Later on
$25 yearly
Registered agent
Yes, the law says so
Our ranking
CO Registered Agent.org, Mainstay Filing then Colorado Registered Agent.co

Our Colorado picks

Prices come from each company's own pricing. Here's how we pick.
Best overall

1. CO Registered Agent.org: best for a lean start

Formation is $199 plus the state fee, and the agent renews at $99

Why CO Registered Agent.org? Honestly, forming your LLC costs $199 and the agent is covered in year one, then $99 a year.

It's the cheaper of the two over three years, and cost is our first check.

The periodic report isn't part of the price, so that's on you.

Your money buys

  • The state filing, done
  • Agent included for year one

The good

  • Starts at $199 over the state fee
  • Then $99 a year for the agent
  • You don't pay for an agent in year one

Trade-offs

  • You'll have to remember the periodic report on your own
  • Add $99 if you want help with the EIN
Any state you add

2. Mainstay Filing: best for staying out of the paperwork

$199 yearly ($249 due when you sign up, state fee included)

Mainstay Filing comes next since one yearly price, $199, covers the filing, the registered agent and the periodic report.

The three-year gap to CO Registered Agent.org is $200, and that's why it ranks lower.

It files your periodic report for you and passes the state's $25 along at cost.

Your money buys

  • The state filing, taken care of
  • Registered agent all year
  • Periodic report taken off your plate
  • We apply for your EIN
  • State fees billed at cost

The good

  • A single yearly price of $199
  • You pay $199 next year
  • The EIN application is part of the deal

Trade-offs

  • CO Registered Agent.org charges $100 less at renewal
One-state pick

3. Colorado Registered Agent.co: best for a second in-state filer

Formation is $199 plus the state fee, and the agent renews at $99

Why Colorado Registered Agent.co third? Honestly, forming your LLC costs $199 and the agent is covered in year one, then $99 a year.

The periodic report isn't part of the price, so that's on you.

CO Registered Agent.org charges the same, which makes this nearly a tie.

Your money buys

  • The state filing, done
  • Agent included for year one

The good

  • You don't pay for an agent in year one
  • Starts at $199 over the state fee
  • Then $99 a year for the agent

Trade-offs

  • You'll have to remember the periodic report on your own
  • Add $99 if you want help with the EIN

Compared

#CompanyFirst yearAfter year oneOver three yearsIn the price
1CO Registered Agent.org$199$99/yr$397the state filing, done; agent included for year oneCheck out CO Registered Agent.orgPartner link. We may earn money if you buy.
2Mainstay Filing$199$199/yr$597the state filing, taken care of; registered agent all year; periodic report taken off your plateCheck out Mainstay FilingPartner link. We may earn money if you buy.
3Colorado Registered Agent.co$199$99/yr$397the state filing, done; agent included for year oneCheck out Colorado Registered Agent.coPartner 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.

What you probably want to know

What does an LLC cost in this state?

Expect the state to take $50, plus $199 for a service in the first year.

Add the state's fees from filing through year three: $100. coloradosos.gov, last seen October 2026

Where do I send the LLC paperwork?

Just one paper forms the LLC: the Articles of Organization, sent to the Colorado Secretary of State.

coloradosos.gov, last seen October 2026

Could I skip naming 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 seen October 2026

What do I owe after the LLC is formed?

Keep the periodic report current. You file it every year for $25. The state lists the due date as last day of the entity's anniversary month, so don't let it slide.

Miss the deadline and the state tacks on $50.

coloradosos.gov, last seen October 2026

Do I have to pay a service at all?

Nothing stops you from filing yourself, and then the three-year bill is $100 in state fees.

Hiring a service runs $397 to $597 over three years, and Mainstay Filing folds the reports into that price, in exchange for the filing work.

What's behind the ranking?

It comes down to cost across three years, and CO Registered Agent.org is best at it.

Together, cost across three years and work taken off your hands make up 64% of the score.

Picking CO Registered Agent.org over Mainstay Filing keeps $200 in your pocket across three years.

Our method, in full

Colorado: the rules, cited

WhatThe answerCheck it
What you pay to file$50coloradosos.gov, last seen October 2026
Registered agentYes, the law says sosos.state.co.us, last seen October 2026
Periodic report$25 every yearcoloradosos.gov, last seen October 2026
Paid to the state by year three$100Added from the rows
The last row is our own sum: the filing fee, the reports for years two and three and any minimum tax. Costs with no set price, like a newspaper notice, are left out.

Also worth knowing

Who gets my EIN?

You'd pay $99 at CO Registered Agent.org or $99 at Colorado Registered Agent.co, and nothing extra at Mainstay Filing.

What happens if I'm late with the report?

$50 gets added to the report fee.

After three years, what have I paid?

Over three years you'd pay $397 at CO Registered Agent.org, $597 at Mainstay Filing, $397 at Colorado Registered Agent.co, with state fees extra.

How official are these figures?

Every state fee links to its official page. Every service price is read from the company's own site.

Does the state make me use a service?

You can skip it. The state's fee is the same whichever way you file.

Who would you go with in Colorado?

CO Registered Agent.org, because $199 gets you formed, and the agent renews each year at $99. After that, Mainstay Filing and Colorado Registered Agent.co.

Where we got this

  1. August 2026: confirmed Colorado Secretary of State using sos.state.co.us
  2. August 2026: confirmed Colorado Secretary of State using sos.state.co.us
  3. October 2026: confirmed Colorado yearly filing: Periodic report using coloradosos.gov
  4. August 2026: confirmed Colorado report due date using colorado.public.law
  5. August 2026: confirmed Colo using sos.state.co.us
  6. October 2026: confirmed Colorado formation fee: Filing fee using coloradosos.gov
  7. CO Registered Agent.org pricing page, read November 13, 2026
  8. Mainstay Filing Colorado service page, read November 13, 2026
  9. Colorado Registered Agent.co pricing page, read November 13, 2026