Registered agent required
Yes
Source: cga.ct.gov, October 2026
Registered agent guide · Connecticut
Connecticut Registered Agents (2026): State Rules, Fees and the 3 Best Agents
If you are choosing an agent for Connecticut this year (2026), begin with Mainstay Filing ($149 a year), CT Registered Agent.org ($99 a year) and Connecticut Registered Agent.co ($99 a year), working down the list. A registered agent is a legal requirement for Connecticut LLCs. Each year the state itself collects $80; that is 36th of 50.
Connecticut: the figures
36th
out of 50 states, measured on one year of state charges
First place is the smallest bill. Every state compared
Annual report
$80 / yr
The state sets the deadline as on or before March 31. Source: business.ct.gov, October 2026
State charges, per year
$80
One year of the report plus any minimum tax
Our Connecticut recommendations
Most of the weight goes to three-year charges and coverage. Read the methodology for all five criteria.
1. Mainstay Filing: best for owners who plan to expand
$149 a year ($149 on renewal)
Mainstay Filing is our first choice because one agent price, $149, in all fifty states, so a growing company keeps a single vendor.
Compared with CT Registered Agent.org, the three-year service bill is $150 higher, and more of the required filings are handled.
What the price buys
- A street address to serve as your registered office
- Anything served on the company is scanned and sent to you that business day, free of charge
- The first three letters from government agencies each year are scanned at no charge
- Also open to nonprofits, partnerships and corporations, not only LLCs
In its favor
- Any state at one price
- Price $149, renewal $149
Against it
- CT Registered Agent.org bills $50 less per year
- Reports are not filed under this plan
2. CT Registered Agent.org: best for a one-state business
$99 a year ($99 on renewal)
CT Registered Agent.org comes next: $99 per year for an agent whose office address is inside the state.
What the price buys
- Connecticut street address serves as the registered office
- You see scanned copies of whatever the agent receives
In its favor
- A flat $99 a year
- Its yearly price sits under Mainstay Filing's
Against it
- Serves Connecticut alone
- You file the annual report yourself
3. Connecticut Registered Agent.co: best for businesses based only in Connecticut
$99 a year ($99 on renewal)
Connecticut Registered Agent.co comes after that: $99 per year for an agent whose office address is inside the state.
The two publish identical prices, CT Registered Agent.org and this service.
What the price buys
- Connecticut street address serves as the registered office
- You see scanned copies of whatever the agent receives
In its favor
- Its yearly price sits under Mainstay Filing's
- A flat $99 a year
Against it
- Serves Connecticut alone
- You file the annual report yourself
The 3 picks at a glance
| No. | Service | Yearly price | Renews at | Service charges, three years | |
|---|---|---|---|---|---|
| 1 | Mainstay Filing | $149 | $149/yr | $447 | Visit Mainstay FilingPartner link. We may earn money if you buy. |
| 2 | CT Registered Agent.org | $99 | $99/yr | $297 | Visit CT Registered Agent.orgPartner link. We may earn money if you buy. |
| 3 | Connecticut Registered Agent.co | $99 | $99/yr | $297 | Visit Connecticut Registered Agent.coPartner link. We may earn money if you buy. |
Prices as published on November 12, 2026. State charges stay the same with any agent.
Yearly cost calculator
Each agent's price is combined with the state charges that repeat (the annual report from year two). Formation fees are not in the total.
Connecticut next to the states ranked around it
| Place | State | Yearly state fees |
|---|---|---|
| 34th | Illinois | $75 |
| 34th | New Jersey | $75 |
| 36th | Connecticut | $80 |
| 37th | Maine | $85 |
| 38th | New Hampshire | $100 |
Registered agent rules by state lists every state, least expensive first.
What Connecticut law requires of a registered agent
Every LLC must name a registered agent with an in-state street address. The address has to be a Connecticut street address that is not a P.O. box, plus a Connecticut mailing address, which can be a P.O. box.
Who counts as an agent: A Connecticut resident, or a business entity formed in Connecticut or registered there. The agent signs to accept the appointment. Legal basis: Conn. Gen. Stat. § 34-243n.
The state charges that repeat
The annual report is due every year at a cost of $80 (deadline on or before March 31). Notices about it go to your registered agent.
How we ordered the Connecticut picks
Mainstay Filing won by scoring higher on paperwork the price takes on, worth 26%, with CT Registered Agent.org close behind.
One agent for any state outranked the one-state option.
Frequently asked questions
Does every Connecticut LLC need a registered agent?
Yes. Every LLC must name a registered agent with an in-state street address.
Who may act as the registered agent for Connecticut LLCs?
A Connecticut resident, or a business entity formed in Connecticut or registered there. The agent signs to accept the appointment.
What is the yearly price of registered agent service for Connecticut?
$99 to $149 a year, going by the picks here.
What does the state itself charge an LLC each year?
About $80 a year by our yearly measure, which comes from the annual report ($80 every year).
Which registered agents are recommended on this page?
Mainstay Filing ($149 a year), CT Registered Agent.org ($99 a year) and Connecticut Registered Agent.co ($99 a year), in the order we rank them.
Which registered agent is the best choice?
Mainstay Filing first, then CT Registered Agent.org and Connecticut Registered Agent.co. What separates Mainstay Filing is paperwork the price takes on.
Sources for this chapter
- business.ct.gov supplies Connecticut Secretary of the State, Business Services Division, last opened August 2026
- business.ct.gov supplies Connecticut Secretary of the State, Business Services Division, last opened August 2026
- business.ct.gov supplies Connecticut yearly filing: Annual report: fee, official source, last opened October 2026
- cga.ct.gov supplies Connecticut report due date, last opened August 2026
- business.ct.gov supplies Connecticut formation fee: Filing fee, official source, last opened October 2026
- business.ct.gov supplies Connecticut formation fee: Filing fee, official source, last opened October 2026
- ilsos.gov supplies Illinois Secretary of State, Department of Business Services, last opened August 2026
- ilsos.gov supplies Illinois Secretary of State, Department of Business Services, last opened August 2026
- njportal.com supplies New Jersey Division of Revenue and Enterprise Services, last opened August 2026
- njportal.com supplies New Jersey Division of Revenue and Enterprise Services, last opened August 2026
- maine.gov supplies Maine Secretary of State, last opened August 2026
- maine.gov supplies Maine Secretary of State, last opened August 2026
- sos.nh.gov supplies New Hampshire Secretary of State, Corporations Division, last opened August 2026
- sos.nh.gov supplies New Hampshire Secretary of State, Corporations Division, last opened August 2026
- Mainstay Filing, Connecticut service page, on the company's page November 12, 2026
- CT Registered Agent.org, pricing page, on the company's page November 12, 2026
- Connecticut Registered Agent.co, pricing page, on the company's page November 12, 2026