Place1
Our top pick in ConnecticutConnecticut Registered Agent.co
1. Connecticut Registered Agent.co: best for a low-cost Connecticut LLC
Formation $199 plus state fee; renewal $99
Our mark9.1out of 10
Top of our list: Connecticut Registered Agent.co, for the Connecticut filing for $199 and a free first year of registered agent service, then $99 a year.
Served documents are scanned and shared online, and the registered office is a Connecticut street address.
The annual report is left to you every year.
It beats Mainstay Filing on three-year cost, the heaviest criterion we score, and matches it on renewal terms.
What you get
- LLC filing done for you
- First year of registered agent service
Why pick it
- First year of registered agent service included
- Then $99 a year
- Formation fee $199
Less good
- Annual report filing not in the price
- EIN help is $99
Place2
All-in priceMainstay Filing
2. Mainstay Filing: best for formation, agent and annual report in one price
$199/yr + state fee ($319 due today)
Our mark8.6out of 10
Number 2 is Mainstay Filing: $199 a year buys the formation, a year of registered agent service and the annual report filed for you.
Each year Mainstay prepares and files the annual report, passing the $80 state fee through at cost.
On cost it trails Connecticut Registered Agent.co by $200 over three years.
What you get
- Formation prepared and filed
- Your registered agent, all year
- Your annual report prepared and filed
- EIN application
Why pick it
- State fee at cost, no markup
- Single $199 yearly price
- Same $199 at renewal
- EIN application included
Less good
- Renews at $100 a year more than Connecticut Registered Agent.co's agent
Place3
Lower renewal than MainstayCT Registered Agent.org
3. CT Registered Agent.org: best for a second Connecticut option
Formation $199 plus state fee; renewal $99
Our mark8.4out of 10
Third: CT Registered Agent.org, for the Connecticut filing for $199 and a free first year of registered agent service, then $99 a year.
Served documents are scanned and shared online, and the registered office is a Connecticut street address.
The annual report is left to you every year.
With identical published prices, Connecticut Registered Agent.co and CT Registered Agent.org are separated only narrowly.
What you get
- LLC filing done for you
- First year of registered agent service
Why pick it
- Then $99 a year
- First year of registered agent service included
- Formation fee $199
Less good
- Annual report filing not in the price
- EIN help is $99
Our top 3 at a glance
| Rank | Service | Our score | Service fee | Year two | Best for | Link |
|---|
| 1 | Connecticut Registered Agent.co | 9.1 | $199 | $99/yr | A Connecticut-only LLC on a budget | Visit Connecticut Registered Agent.coPartner link. We may earn money if you buy. |
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| 2 | Mainstay Filing | 8.6 | $199 | $199/yr | Formation, agent and annual report in one price | Visit Mainstay FilingPartner link. We may earn money if you buy. |
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| 3 | CT Registered Agent.org | 8.4 | $199 | $99/yr | A Connecticut-only LLC on a budget | Visit CT Registered Agent.orgPartner link. We may earn money if you buy. |
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Scores are The Founders Review's own editorial scores out of 10, from the criteria on our How we rank page. They are not customer ratings.
Connecticut LLC service cost over three years (2026)
| Service | Year one | Year two | Year three | Three-year total | Annual report filed for you |
|---|
| Connecticut Registered Agent.co | $199 | $99 | $99 | $397 | No |
|---|
| Mainstay Filing | $199 | $199 | $199 | $597 | Yes |
|---|
| CT Registered Agent.org | $199 | $99 | $99 | $397 | No |
|---|
Read from each provider's pricing page on November 12, 2026. Add Connecticut's $120 filing fee to every row; it is not in these totals.
How the order was decided
Our method scores three-year cost (30%) and what one price covers (30%) most heavily, then renewal terms, fit for the state and price clarity. Here the order came down to three-year cost.
Connecticut Registered Agent.co costs $397 over three years, $200 less than Mainstay Filing. The annual report filing Mainstay adds was not worth the extra cost on our method.
See How we rank for every criterion and weight.
What forming an LLC in Connecticut costs (2026)
The state fee is $120, paid to the Connecticut Secretary of State with the Certificate of Organization (Conn. Gen. Stat. § 34-247). Each service adds it at cost.
Processing: Most online filings automatically accepted.
Yearly upkeep and your agent
A $80 annual report is due every year by on or before March 31. Every LLC must name a registered agent with an in-state street address.
Connecticut LLC service FAQ
How much does it cost to form an LLC in Connecticut?
$120 to the state, plus $199 for a service to file it.
What form creates the LLC?
The Certificate of Organization, filed with the Connecticut Secretary of State.
How long does Connecticut take to approve an LLC?
Standard processing: Most online filings automatically accepted.
Do I need a registered agent for a Connecticut LLC?
Every LLC must name a registered agent with an in-state street address.
What yearly filings does a Connecticut LLC have?
The annual report, every year, due on or before March 31, with a $80 state fee.
Is the EIN application included?
Mainstay Filing's yearly price includes it. Connecticut Registered Agent.co and CT Registered Agent.org charge $99 for it. The IRS itself charges no fee for an EIN.
Which LLC service is best in Connecticut?
On our method, Connecticut Registered Agent.co: $199 to form the LLC in Connecticut, with the agent at $99 a year from year two.
Official sources and price pages
- August 2026 check of Connecticut Secretary of the State, Business Services Division: business.ct.gov/business-services/file-annual-report
- August 2026 check of Connecticut Secretary of the State, Business Services Division: business.ct.gov/knowledge-base/articles/annual-report/file-an-annual-r
- October 2026 check of Connecticut yearly filing: Annual report: fee, official source: business.ct.gov/knowledge-base/articles/domestic-annual-report-forms-a
- August 2026 check of Connecticut report due date: www.cga.ct.gov/current/pub/chap_613a.htm
- October 2026 check of Connecticut formation fee: Filing fee, official source: business.ct.gov/knowledge-base/articles/domestic-limited-liability-com
- October 2026 check of Connecticut formation fee: Filing fee, official source: business.ct.gov/-/media/businessonestop/fee-schedule-revised-712020.pd
- October 2026 check of Processing and expedite, official source: business.ct.gov/knowledge-base/articles/expedited-services
- Connecticut Registered Agent.co, pricing and service pages (read November 12, 2026)
- Mainstay Filing, Connecticut service page (read November 12, 2026)
- CT Registered Agent.org, pricing and service pages (read November 12, 2026)