3 Best LLC Services in Connecticut (2026), and What to Know First
For LLC formation services in Connecticut, we would ask Mainstay Filing ($199), Connecticut Registered Agent.co ($199) and CT Registered Agent.org ($199) in 2026, in that order. Every option pays Connecticut $120 to file, then charges $397 to $597 for three years of service.
Answered by the Ask About LLC editorial team ·
The short answers
What does the state charge?
$120, one time
Every year after
$80 each year
Registered agent
Yes, name one
Our pick
Mainstay Filing, Connecticut Registered Agent.co then CT Registered Agent.org
Service fees only, from each company's prices on November 13, 2026. State fees are the same whichever you pick.
What owners want to know
What will forming an LLC cost in this state?
Set aside $120 for the state, plus $199 if you hire help in the first year.
Add the recurring report and the state's fees reach $280 over three years. business.ct.gov, read in October 2026 for this answer
Which form do I file, and where does it go?
The Connecticut Secretary of State receives the Certificate of Organization, and once it approves, the LLC exists.
Legal basis: Conn. Gen. Stat. § 34-247. Processing time, per the state: most online filings automatically accepted. business.ct.gov, read in October 2026 for this answer
Can the LLC go without a registered agent?
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.
The last row is arithmetic, not a state figure: filing fee, plus the reports due in years two and three, plus a minimum tax where one applies. Open-ended costs stay out.
Still wondering?
How soon does the LLC exist?
Most online filings automatically accepted.
Is the EIN application included?
Only Mainstay Filing covers it at no added cost. At the others, Connecticut Registered Agent.co bills $99 and CT Registered Agent.org bills $99.
What do the picks cost over three years?
For three years you would pay $597 at Mainstay Filing, $397 at Connecticut Registered Agent.co, $397 at CT Registered Agent.org for the services alone.
Where do these numbers come from?
Official Connecticut sources back the state side, and posted company prices back the service side.
Do I have to use a service?
Not at all. The state takes filings from owners directly. A service just saves you time, and it can double as your agent.
What is the best LLC service for Connecticut?
Mainstay Filing comes first: for $199 a year the formation, the registered agent and the annual report are all taken care of. Next are Connecticut Registered Agent.co and CT Registered Agent.org.
Where did we look this up?
Ask-about note for Connecticut Secretary of the State: the state publishes it at business.ct.gov, confirmed August 2026, so you can look it up yourself
Ask-about note for Connecticut Secretary of the State: the state publishes it at business.ct.gov, confirmed August 2026, so you can look it up yourself
Ask-about note for Connecticut yearly filing: Annual report: the state publishes it at business.ct.gov, confirmed October 2026, so you can look it up yourself
Ask-about note for Connecticut report due date: the state publishes it at cga.ct.gov, confirmed August 2026, so you can look it up yourself
Ask-about note for Connecticut formation fee: Filing fee: the state publishes it at business.ct.gov, confirmed October 2026, so you can look it up yourself
Ask-about note for Connecticut formation fee: Filing fee: the state publishes it at business.ct.gov, confirmed October 2026, so you can look it up yourself
Ask-about note for Processing and expedite, official source: the state publishes it at business.ct.gov, confirmed October 2026, so you can look it up yourself
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