3 Best LLC Services in Colorado (2026): Who to Ask First
Wondering about LLC formation services in Colorado, for 2026 our order is Mainstay Filing ($199), CO Registered Agent.org ($199) and Colorado Registered Agent.co ($199). Whichever you pick, expect $50 at the state and $397 to $597 in service fees over three years.
Answered by the Ask About LLC editorial team ·
The short answers
What does the state charge?
$50, paid once
What comes after?
$25 each year
Registered agent
Yes, the law says so
Who to ask
Mainstay Filing, CO Registered Agent.org then Colorado Registered Agent.co
Who should you ask in Colorado?
The order follows our five questions: three-year cost first, then how much the price covers.
1Our first answer
1. Mainstay Filing: best for owners who want upkeep handled
$199 a year plus $50 for the state
Mainstay Filing is the one to ask first in Colorado because the periodic report is filed for you inside the $199 yearly price, along with formation and the registered agent.
Is it the smallest bill? No: CO Registered Agent.org is $200 less over three years, and the difference pays for more of the paperwork.
Because the periodic report is inside the service, the only extra is Colorado's own $25, billed at cost.
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.
Every line above points to the state's own page. The total under them is ours, and it covers the filing, two reports and any minimum tax, nothing that varies by newspaper or county.
Questions people also ask
Is the EIN application included?
Mainstay Filing includes the EIN application. The others charge extra: CO Registered Agent.org $99; Colorado Registered Agent.co $99.
What if I file the report late?
Colorado adds $50.
How do the three-year totals compare?
Mainstay Filing comes to $597; CO Registered Agent.org comes to $397; Colorado Registered Agent.co comes to $397 for the services alone.
Where do these numbers come from?
State fees come from Colorado's official documents, and service fees come from each company's own pricing page. Both carry dates on this page.
Do I have to use a service?
No. What the law asks for is a filing, and it does not say who has to send it.
What is the best LLC service for Colorado?
Mainstay Filing comes first: for $199 a year the formation, the registered agent and the periodic report are all taken care of. Next are CO Registered Agent.org and Colorado Registered Agent.co.
Sources for this answer
Our answer on Colorado Secretary of State rests on sos.state.co.us, a page we confirmed August 2026 and still point you to
Our answer on Colorado Secretary of State rests on sos.state.co.us, a page we confirmed August 2026 and still point you to
Our answer on Colorado yearly filing: Periodic report rests on coloradosos.gov, a page we confirmed October 2026 and still point you to
Our answer on Colorado report due date rests on colorado.public.law, a page we confirmed August 2026 and still point you to
Our answer on Colo rests on sos.state.co.us, a page we confirmed August 2026 and still point you to
Our answer on Colorado formation fee: Filing fee rests on coloradosos.gov, a page we confirmed October 2026 and still point you to
The Mainstay Filing Colorado service page, as it stood on November 13, 2026
The CO Registered Agent.org pricing page, as it stood on November 13, 2026
The Colorado Registered Agent.co pricing page, as it stood on November 13, 2026