LLC Review Desk's 2026 picks for LLC services in Colorado, favorite first, are Colorado Registered Agent.co ($199), Mainstay Filing ($199) and CO Registered Agent.org ($199). Colorado Registered Agent.co is our favorite, because $199 for formation on top of the state fee, then $99 a year for the agent.
By the LLC Review Desk editorial team
Position 1
Our top pick
1. Colorado Registered Agent.co: best for a Colorado LLC that will stay put
$199 to form, then $99 a year for the agent, with the state fee on top
Our score
9.1out of 10
9.1 out of 10
Our favorite is Colorado Registered Agent.co, because forming in Colorado is $199 plus the state fee, and your first year as registered agent is included, then $99 a year.
You get a street address in the state for your registered office, and any papers served on the company are scanned into your online account.
The periodic report isn't part of its published price, so you send it to Colorado yourself every year.
This is where it beats Mainstay Filing: what you pay over three years.
2. Mainstay Filing: best for formation, agent and periodic report in one simple price
$199 a year, and the state fee goes on top ($249 at checkout)
Our score
8.9out of 10
8.9 out of 10
Coming in second is Mainstay Filing, because for one yearly price of $199 you get the Colorado filing, registered agent service and the periodic report, then $199 at renewal.
When your plan renews, Mainstay files the periodic report for you. Colorado charges $25 every year for it, and the date is last day of the entity's anniversary month, and a late one costs $50 more. Mainstay passes the state's fee along at cost.
Colorado Registered Agent.co is $200 cheaper over three years, so Mainstay Filing comes second on cost.
In the price
Preparation and filing of the formation document
Your registered agent all year
Your periodic report, prepared and filed for you
Your EIN application, taken care of
What we like
The EIN application is included
Renews at $199, no add-ons
One yearly price of $199 that includes the periodic report
Colorado's fee is passed through at cost
Trade-offs
After year one, its agent costs $100 a year more than Colorado Registered Agent.co's
3. CO Registered Agent.org: best for a Colorado-only LLC
$199 to form, then $99 a year for the agent, with the state fee on top
Our score
8.7out of 10
8.7 out of 10
In third place is CO Registered Agent.org, because forming in Colorado is $199 plus the state fee, and your first year as registered agent is included, then $99 a year.
You get a street address in the state for your registered office, and any papers served on the company are scanned into your online account.
The periodic report isn't part of its published price, so you send it to Colorado yourself every year.
Between Colorado Registered Agent.co and CO Registered Agent.org, prices and features match, so it's nearly a tie.
LLC Review Desk gives each score out of 10 itself, based on the criteria on How we rank. No customer ratings are involved.
What Colorado LLC services cost in 2026: year one, renewals and three years
Service
First year
Second year
Third year
Three-year total
Handles the periodic report too
Colorado Registered Agent.co
$199
$99
$99
$397
No
Mainstay Filing
$199
$199
$199
$597
Yes
CO Registered Agent.org
$199
$99
$99
$397
No
We took each price from the company's own pages on November 12, 2026. On top of every row, Colorado charges a $50 filing fee, which isn't in these totals.
How the order came together
Here's how we scored it: three-year cost and filings in the price are worth 29% each, and renewal price, state fit and up-front totals split the other 42%. In Colorado, three-year cost made the difference.
Colorado Registered Agent.co comes to $397 over three years, which is $200 less than Mainstay Filing. Mainstay would file the periodic report too, but you can do it yourself for the state fee, so the lower price won here.
You can read every criterion and weight on How we rank.
The Colorado LLC filing fee and form, from the state
Heads up: the Colorado Secretary of State takes $50 when you file the Articles of Organization. Every service below adds that fee at cost.
What a Colorado LLC needs after it is formed
There's one recurring item: the periodic report, every year, by last day of the entity's anniversary month. The state asks for $25. A late filing adds $50. Every LLC must name a registered agent with an in-state street address.
Your questions about Colorado LLC services
How much does forming an LLC in Colorado set you back?
The state charges $50 to file, and services charge $199.
What paperwork makes the LLC official?
You send the Articles of Organization to the Colorado Secretary of State.
Does the Colorado formation form ask me to name a registered agent?
Yes. You list a registered agent when you file and keep one on record, using a street address in Colorado.
Is there paperwork after the LLC is formed?
Yes, one item: the periodic report. It comes every year, by last day of the entity's anniversary month, and the state asks $25.
Is the EIN included in the price?
With Mainstay Filing, yes; it comes with the yearly price. Colorado Registered Agent.co and CO Registered Agent.org tack on $99 for it. You can also ask the IRS for an EIN yourself, free of charge.
Who should I use to form my Colorado LLC?
Colorado Registered Agent.co, because the Colorado formation costs $199 over the state's fee, with the registered agent free the first year, and keeping the agent is $99 a year.