LLC service ratings · Connecticut
3 Best LLC Services in Connecticut (2026)
1. Mainstay Filing: best for formation, agent and annual report on a single line
$199 a year plus the state fee, $319 due at checkout
Mainstay Filing is rated first: one $199 yearly line covers the Connecticut formation, a year as registered agent and the annual report, with $199 on renewal.
Mainstay files the annual report at each renewal. The state's line is $80 every year, due on or before March 31, and Mainstay passes that fee on at cost.
On three-year sums Mainstay is $200 above CT Registered Agent.org; the wider coverage justifies that gap in the rating.
What you get
- LLC formation filed on your behalf
- Registered agent service for the whole year
- Annual report prepared and filed
- EIN application
Pros
- Connecticut's fee goes through at cost
- $199 on renewal with no extras
- EIN application is in the package
- One $199 yearly line that includes the annual report
Trade-offs
- Agent renews $100 a year above CT Registered Agent.org
2. CT Registered Agent.org: best for a Connecticut LLC that will not expand
$199 to form, $99 a year for the agent, state fee extra
CT Registered Agent.org is rated second: $199 to form, state fee on top, then $99 a year for the agent.
The plan lists an in-state street address as the registered office and scans papers served there into your account.
The annual report sits outside its published prices; you file it with Connecticut yourself every year.
What you get
- Formation prepared and filed
- A year of registered agent service at the start
Pros
- $99 per year to keep the agent
- $199 service fee and the filing fee
- Registered agent service for year one is included
Trade-offs
- The annual report is not on its price list
- EIN application billed at $99
3. Connecticut Registered Agent.co: best for staying local in Connecticut
$199 to form, $99 a year for the agent, state fee extra
Connecticut Registered Agent.co is rated third: $199 to form, state fee on top, then $99 a year for the agent.
The plan lists an in-state street address as the registered office and scans papers served there into your account.
The annual report sits outside its published prices; you file it with Connecticut yourself every year.
Nothing in the published amounts or features separates CT Registered Agent.org from Connecticut Registered Agent.co; take either.
What you get
- Formation prepared and filed
- A year of registered agent service at the start
Pros
- Registered agent service for year one is included
- Agent line of $99 from year two
- $199 to form, state fee on top
Trade-offs
- The annual report is not on its price list
- EIN application billed at $99
The 3 ratings summarized
| Line | Service | Rating | Service fee | Year two | Best for | Open |
|---|---|---|---|---|---|---|
| 1 | Mainstay Filing | 9.5 | $199 | $199/yr | Formation, agent and annual report on one line | Visit Mainstay FilingPartner link. We may earn money if you buy. |
| 2 | CT Registered Agent.org | 9.0 | $199 | $99/yr | A Connecticut-only LLC counting every dollar | Visit CT Registered Agent.orgPartner link. We may earn money if you buy. |
| 3 | Connecticut Registered Agent.co | 8.8 | $199 | $99/yr | A Connecticut-only LLC counting every dollar | Visit Connecticut Registered Agent.coPartner link. We may earn money if you buy. |
Connecticut LLC service amounts for 2026: year one, renewal and three-year sum
| Service | Year one | Year two | Year three | Three-year sum | Annual report filed by them |
|---|---|---|---|---|---|
| Mainstay Filing | $199 | $199 | $199 | $597 | Yes |
| CT Registered Agent.org | $199 | $99 | $99 | $397 | No |
| Connecticut Registered Agent.co | $199 | $99 | $99 | $397 | No |
How the lines were rated
Weights: 27% cost over years one to three, 27% inclusions per price, 46% shared by renewal price and terms, fit with state rules and price clarity. Inclusions per price decided Connecticut.
Connecticut requires a report annually at $80. Mainstay's amount covers that filing while CT Registered Agent.org's does not, so coverage outweighed CT Registered Agent.org's lower three-year sum.
Each criterion and its weight is listed on How we rank.
Connecticut LLC formation: official amount and form
Filing the Certificate of Organization costs $120, paid to the Connecticut Secretary of State. Each service here passes that amount through at cost, added to its own.
State processing time: Most online filings automatically accepted.
Ongoing items for a Connecticut LLC
Plan on the annual report every year; the date is on or before March 31. State amount: $80. Every LLC must name a registered agent with an in-state street address.
Connecticut LLC service: your questions
What are the total costs to form an LLC in Connecticut?
$120 to the state plus $199 to the service.
What is the formation document called?
It is the Certificate of Organization, lodged with the Connecticut Secretary of State.
How long does Connecticut take to process a new LLC?
The filing office reports: Most online filings automatically accepted.
Is a registered agent a requirement for a Connecticut LLC?
Yes. Connecticut wants a registered agent on file at all times, with a physical street address in the state.
Which filings recur each year for a Connecticut LLC?
One line item: the annual report, every year, due on or before March 31, fee $80.
Is the EIN application a separate charge?
Mainstay Filing includes it in the yearly price. CT Registered Agent.org and Connecticut Registered Agent.co charge $99 separately. At the IRS the EIN itself costs nothing.
Which LLC service holds the top rating in Connecticut?
Mainstay Filing, as $199 a year includes the formation filing, the registered agent and the annual report; renewal is $199.
Source lines
- Connecticut Secretary of the State, Business Services Division (ledger date August 2026)
- Connecticut Secretary of the State, Business Services Division (ledger date August 2026)
- Connecticut yearly filing: Annual report: fee, official source (ledger date October 2026)
- Connecticut report due date (ledger date August 2026)
- Connecticut formation fee: Filing fee, official source (ledger date October 2026)
- Connecticut formation fee: Filing fee, official source (ledger date October 2026)
- Processing and expedite, official source (ledger date October 2026)
- Mainstay Filing, Connecticut service page: amounts read November 12, 2026
- CT Registered Agent.org, pricing and service pages: amounts read November 12, 2026
- Connecticut Registered Agent.co, pricing and service pages: amounts read November 12, 2026