Kept simple · Connecticut
3 Best LLC Services in Connecticut (2026) and What Connecticut Requires
The short version
- State fee
- $120, paid once
- Afterward
- $80 yearly
- Registered agent
- Required: yes
- Our pick
- Mainstay Filing, Connecticut Registered Agent.co then CT Registered Agent.org
Ranked in Connecticut
Why this order? The checks are explained here.1. Mainstay Filing: best for one price for formation and upkeep
$199 a year, plus the $120 state fee
Mainstay Filing comes first because $199 a year pays for formation, the registered agent and the annual report, and renews at $199.
Connecticut Registered Agent.co costs $200 less over three years. You would do more of the paperwork.
It files the annual report. The state's $80 is passed on at cost.
Includes
- LLC formation, filed
- Registered agent for a year
- Annual report filed for you
- EIN application filed
- State fees at cost
Good
- Renews at $199
- A flat $199 a year
- EIN handled
Against
- $100 a year above Connecticut Registered Agent.co after year one
2. Connecticut Registered Agent.co: best for a one-state LLC
Year one $199. Later years $99
Connecticut Registered Agent.co ranks second. Its $99 renewal makes three years $397.
The price leaves out the annual report.
Includes
- Connecticut formation filing
- Agent for year one
Good
- The first agent year is included
- Starts at $199 over the state fee
- Then $99 yearly
Against
- Leaves the annual report on your desk
- $99 to apply for your EIN
3. CT Registered Agent.org: best for single-state companies
Year one $199. Later years $99
CT Registered Agent.org ranks third. Its $99 renewal makes three years $397.
The price leaves out the annual report.
Price for price, a tie with Connecticut Registered Agent.co.
Includes
- Connecticut formation filing
- Agent for year one
Good
- The first agent year is included
- Starts at $199 over the state fee
- Then $99 yearly
Against
- Leaves the annual report on your desk
- $99 to apply for your EIN
Side by side
| # | Name | Start | After year one | Total | Includes | |
|---|---|---|---|---|---|---|
| 1 | Mainstay Filing | $199 | $199/yr | $597 | LLC formation, filed; registered agent for a year; annual report filed for you | Go to Mainstay FilingPartner link. We may earn money if you buy. |
| 2 | Connecticut Registered Agent.co | $199 | $99/yr | $397 | connecticut formation filing; agent for year one | Go to Connecticut Registered Agent.coPartner link. We may earn money if you buy. |
| 3 | CT Registered Agent.org | $199 | $99/yr | $397 | connecticut formation filing; agent for year one | Go to CT Registered Agent.orgPartner link. We may earn money if you buy. |
Key questions
How much to start an LLC in this state?
$120 to the state. $199 more if a service files for you.
State fees, years one to three: $280. business.ct.gov as of October 2026, our only source here
Which form, and where?
You submit one filing, the Certificate of Organization, to the Connecticut Secretary of State.
Statute: Conn. Gen. Stat. § 34-247. Expect: most online filings automatically accepted. business.ct.gov as of October 2026, our only source here
Is a registered agent required?
Every LLC must name a registered agent with an in-state street address.
A Connecticut resident, or a business entity formed in Connecticut or registered there. The agent signs to accept the appointment.
cga.ct.gov as of October 2026, our only source here
What is owed later?
One filing repeats: the annual report, yearly, $80. The wording from the state is: on or before March 31, so plan around it.
business.ct.gov as of October 2026, our only source here
Can I file it myself?
Yes. Your three-year bill is the state's $280.
Services charge $397 to $597 over three years for the paperwork and the agent.
Why this order?
Mainstay Filing scores best on work included, which is 27% of the score.
Five checks: three-year cost (38%), work included (27%), readable pricing (13%), renewal steadiness (11%) and state coverage (11%).
One thing decides it. The annual report is in the first pick's price. Connecticut Registered Agent.co leaves it to you.
Connecticut: forming an LLC
| Item | Rule or amount | Confirm |
|---|---|---|
| LLC filing fee | $120 | business.ct.gov as of October 2026, our only source here |
| Registered agent | Required: yes | cga.ct.gov as of October 2026, our only source here |
| Annual report | $80 every year | business.ct.gov as of October 2026, our only source here |
| Three-year state total | $280 | The rows above, added |
Also asked
How long does the state take?
Most online filings automatically accepted.
Is the EIN application included?
Add-on prices for the EIN application: $99 from Connecticut Registered Agent.co, $99 from CT Registered Agent.org. Mainstay Filing includes it.
What do the picks cost over three years?
Across three years: Mainstay Filing at $597, Connecticut Registered Agent.co at $397, CT Registered Agent.org at $397, with state fees on top.
Where do the figures come from?
Official Connecticut sources for the state side. Published prices for the service side.
Must I use a service?
No. Owners may file directly. A service saves time and can act as agent.
What is the best LLC service in Connecticut?
Mainstay Filing ranks first. One yearly price, $199, includes formation, the registered agent and every annual report. After it, Connecticut Registered Agent.co and CT Registered Agent.org.
Sources
- Charter Simple keeps Connecticut Secretary of the State on file from business.ct.gov, confirmed August 2026, and nothing more
- Charter Simple keeps Connecticut Secretary of the State on file from business.ct.gov, confirmed August 2026, and nothing more
- Charter Simple keeps Connecticut yearly filing: Annual report on file from business.ct.gov, confirmed October 2026, and nothing more
- Charter Simple keeps Connecticut report due date on file from cga.ct.gov, confirmed August 2026, and nothing more
- Charter Simple keeps Connecticut formation fee: Filing fee on file from business.ct.gov, confirmed October 2026, and nothing more
- Charter Simple keeps Connecticut formation fee: Filing fee on file from business.ct.gov, confirmed October 2026, and nothing more
- Charter Simple keeps Processing and expedite, official source on file from business.ct.gov, confirmed October 2026, and nothing more
- Mainstay Filing Connecticut service page, read November 13, 2026
- Connecticut Registered Agent.co pricing page, read November 13, 2026
- CT Registered Agent.org pricing page, read November 13, 2026