Registered agent cost calculators + Colorado
3 Best Registered Agents in Colorado (2026): Cost Calculator
Result order: Cost 41% plus coverage 27% plus three smaller terms (see the formula)
Colorado: key outputs
Colorado ranking
1. Mainstay Filing: best for LLCs in several states
Best resultMainstay Filing calculates best. The input stays $149 a year no matter where the company registers next.
CO Registered Agent.org is $150 lower at year three, but the 27% coverage term still ranks this one first.
Inputs covered
- A real address in the state
- Up to three government mailings a year, scanned free
- Covers LLCs, corporations, LPs, LLPs and nonprofits
Adds up well
- The same price in all fifty states
- Constant $149 per year
Adds up badly
- CO Registered Agent.org is $50 cheaper each year
- Does not file the yearly report
2. CO Registered Agent.org: best for owners watching every dollar
Colorado onlyCO Registered Agent.org places second. Agent service in one state for $99 a year.
Inputs covered
- An office address located in the state
- Papers served on the LLC scanned to your account
Adds up well
- $99 a year, no change at renewal
- Comes in under Mainstay Filing each year
Adds up badly
- Another state means another agent
- The periodic report is not in the input
3. Colorado Registered Agent.co: best for keeping the agent in state
Colorado onlyColorado Registered Agent.co places third. Agent service in one state for $99 a year.
The year-one and renewal inputs both equal CO Registered Agent.org's.
Inputs covered
- An office address located in the state
- Papers served on the LLC scanned to your account
Adds up well
- $99 a year, no change at renewal
- Comes in under Mainstay Filing each year
Adds up badly
- Another state means another agent
- The periodic report is not in the input
Totals at 1, 2, 3 and 5 years
| Rank | Service | Result, year 1 | Result, year 2 | Result, year 3 | Result, year 5 | |
|---|---|---|---|---|---|---|
| 1 | Mainstay Filing | $149 | $298 | $447 | $745 | Open Mainstay FilingPartner link. We may earn money if you buy. |
| 2 | CO Registered Agent.org | $99 | $198 | $297 | $495 | Open CO Registered Agent.orgPartner link. We may earn money if you buy. |
| 3 | Colorado Registered Agent.co | $99 | $198 | $297 | $495 | Open Colorado Registered Agent.coPartner link. We may earn money if you buy. |
Try other years
Official state charges
| Input | Amount | Source |
|---|---|---|
| Cost to form | $50 | coloradosos.gov {input read October 2026, shown in full} |
| Periodic report | $25 every year | coloradosos.gov {input read October 2026, shown in full} |
| Late filing charge | $50 | coloradosos.gov {input read October 2026, shown in full} |
| Three-year state total | $100 | Sum of the inputs above |
Why result one is first
Mainstay Filing wins filing work in the price, worth 27%, with CO Registered Agent.org close behind.
On coverage across states, CO Registered Agent.org cannot compete.
The Colorado registered agent rule as the state states it (Colorado Secretary of State)
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. Check C.R.S. § 7-90-701.
The address has to be a physical address in Colorado, either a home or a usual place of business. P.O. boxes are not accepted.
Cited at: sos.state.co.us {input read October 2026, shown in full}
Without a service
An eligible owner adds nothing by acting as a registered agent. Each service above bills $99 to $149 a year for the in-state address.
Quick answers
What does a Colorado registered agent charge per year?
These agents charge $99 to $149 per year.
What do three years of agent service cost?
Year one plus two renewals calculates to $297 to $447.
Is a registered agent a must for a Colorado LLC?
Yes, it does. Every LLC must name a registered agent with an in-state street address.
Can the owner be the registered agent?
Yes, when you qualify under the rules listed here.
What does the state charge the LLC each year?
$25 annually goes to the periodic report, with the state setting the deadline at last day of the entity's anniversary month.
When does one service pass another in total cost?
No break-even within ten years.
Which registered agent calculates best in Colorado?
Result one is Mainstay Filing, then CO Registered Agent.org, then Colorado Registered Agent.co.
Input sources
- We entered Colorado Secretary of State after reading sos.state.co.us in August 2026.
- We entered Colorado Secretary of State after reading sos.state.co.us in August 2026.
- We entered Colorado yearly filing: Periodic report after reading coloradosos.gov in October 2026.
- We entered Colorado report due date after reading colorado.public.law in August 2026.
- We entered Colo after reading sos.state.co.us in August 2026.
- We entered Colorado formation fee: Filing fee after reading coloradosos.gov in October 2026.
- Input from Mainstay Filing: Colorado service page (November 13, 2026)
- Input from CO Registered Agent.org: pricing page (November 13, 2026)
- Input from Colorado Registered Agent.co: pricing page (November 13, 2026)