Colorado, 2026: CO Registered Agent.org ($199), Mainstay Filing ($199) and Colorado Registered Agent.co ($199) are our picks for LLC formation services, in that order. Whoever you pick, Colorado charges $50 to file, and the services run $397 to $597 over three years.
Straight from the LLC Straight Talk editorial team
The short of it
The short of it
What the state charges
$50, once, up front
Every year after
$25 a year
Registered agent
Yes, it's the law
Who we'd use
CO Registered Agent.org, Mainstay Filing then Colorado Registered Agent.co
Who we'd use in Colorado
The order comes from our five tests: three-year cost first, then what the price covers.
#1Our top pick
1. CO Registered Agent.org: best for a business that never leaves one state
$199 plus the state fee, then $99 a year
CO Registered Agent.org is who we'd use first in Colorado, because $199 gets your LLC formed, and then the agent's $99 a year.
Its three-year total's under Mainstay Filing's, which makes it the first pick for a company that stays put.
You're still on the hook for the periodic report.
What you get
Colorado formation filing
The first agent year's on them
Pluses
A free agent year at the start
$199 plus the state fee to form
Agent renews at $99
What's not
The periodic report stays on your plate
EIN help runs $99 more
#2Works in all 50 states
2. Mainstay Filing: best for one price for setup and upkeep
$199 a year and $50 to the state
Mainstay Filing comes in second because the periodic report gets filed inside the $199 yearly price, along with formation and the registered agent.
CO Registered Agent.org is $200 less over three years, and that's enough to decide the order.
The periodic report is part of the service. The only extra's the state's $25.
What you get
Your formation filing, taken care of
Registered agent for a whole year
Periodic report done for you
EIN application filed
State fees passed through, no markup
Pluses
Stays at $199
You don't pay extra for the EIN
One fee: $199 a year
What's not
CO Registered Agent.org renews for $100 less
#3Colorado only
3. Colorado Registered Agent.co: best for single-state outfits
$199 plus the state fee, then $99 a year
$199 gets your LLC formed, and then the agent's $99 a year. That puts Colorado Registered Agent.co third.
You're still on the hook for the periodic report.
It charges what CO Registered Agent.org charges.
What you get
Colorado formation filing
The first agent year's on them
Pluses
Agent renews at $99
$199 plus the state fee to form
A free agent year at the start
What's not
The periodic report stays on your plate
EIN help runs $99 more
The numbers
#
Who
Year one
Each year after
Three-year total
What you get
1
CO Registered Agent.org
$199
$99/yr
$397
colorado formation filing; The first agent year's on them
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.
There's one filing that keeps coming back: the periodic report, yearly, for $25. In the state's own words it's due last day of the entity's anniversary month.
The last row is our math, not the state's: filing fee, plus the reports in years two and three, plus any minimum tax. If a cost has no fixed amount, like a newspaper notice, it's explained above and left out.
More questions
Is the EIN application included?
Mainstay Filing includes the EIN application. The others make you pay: CO Registered Agent.org $99; Colorado Registered Agent.co $99.
What if I'm late with the report?
Expect a $50 late fee.
What do the picks cost over three years?
Over three years you're looking at $397 at CO Registered Agent.org, $597 at Mainstay Filing, $397 at Colorado Registered Agent.co, services only.
Where do these numbers come from?
Official Colorado sources back the state side, and posted prices back the service side.
Do I have to use a service?
Not required. The state takes filings from owners.
What's the best LLC service in Colorado?
CO Registered Agent.org is first: it starts at $199 with the first agent year thrown in, and from year two you pay $99. Then comes Mainstay Filing and Colorado Registered Agent.co.