Registering an Out-of-State LLC to Do Business in Connecticut

In business-filing language, "foreign" does not mean another country. It means another U.S. state. An LLC formed in New York, Massachusetts, Rhode Island, or anywhere outside Connecticut is a foreign LLC as far as Connecticut is concerned. If that out-of-state LLC is going to transact business in Connecticut, it generally has to register with the Connecticut Secretary of the State before doing so.

When qualification is required

The line is "transacting business" in Connecticut. The statute never defines the term, so the common triggers are the ones that look like a real local operation:

• Having a physical location (an office, a store, a warehouse) in Connecticut.
• Having employees who work in Connecticut.
• Regularly providing services to Connecticut customers on the ground in the state.
• Maintaining an ongoing, substantial presence in Connecticut.

When it usually is not

Connecticut's statute lists activities that do not count as transacting business. They include defending or settling a lawsuit, holding meetings of members or managers, keeping bank accounts, selling through independent contractors, taking orders that must be accepted outside Connecticut, borrowing money or granting mortgages, collecting debts, owning property with nothing further, voting securities the company holds, interstate commerce, and one isolated transaction, with no day limit attached to it. The list is open-ended, and the statute adds that passing the test says nothing about whether you owe tax or face other regulation. Because the boundary can be fact-specific, when you are unsure it is worth a quick check with an attorney rather than guessing, because operating without qualifying when you should have can carry real costs.

Registering is not just a box-checking exercise. Operating in Connecticut without qualifying when you were required to can cause practical problems that surface at the worst times.

What is at stake

• Access to Connecticut courts. A foreign LLC that transacts business without registering cannot start a lawsuit in Connecticut courts until it registers. If you need to sue a Connecticut customer who did not pay, you do not want to discover this then. Your contracts stay valid, and you can still defend a case.
• A monthly penalty. The company owes the fees and taxes it would have paid had it registered, with interest and penalties, plus $300 for each month or part of a month it operated unregistered. Registering within 90 days of starting to transact business avoids the monthly charge.
• An injunction. The Attorney General can sue to collect, and the court must also bar the company from doing more business in Connecticut until everything owed has been paid.

Qualifying up front avoids all of this. It puts your LLC on Connecticut's record as a registered foreign entity and lets you operate (and enforce your rights) cleanly. Our Connecticut foreign qualification page lays out the fee and the paperwork for the filing.

Here is where the registered agent becomes central. Just like a domestic Connecticut LLC, a foreign LLC that registers to do business in Connecticut must appoint and maintain a Connecticut registered agent. Your agent back in your home state does not carry over: Connecticut needs its own agent, with a place of business in the state.

Who can serve

Connecticut limits the choice. The options include an individual who lives in Connecticut, an entity formed here or one that is authorized here from elsewhere (corporations, LLCs, and certain partnerships and trusts), or, unusually, the Secretary of the State itself. The form says your LLC cannot appoint itself. A manager or member who is a Connecticut resident can take the role, though. Naming the Secretary of the State carries no appointment fee. Papers are left at the Secretary's office, which mails a copy on to your principal office, and whoever brings the suit pays a $50 service charge.

Why the in-state agent is essential here

This is often the practical obstacle for out-of-state owners. If your LLC and everyone in it are located in another state, you have no Connecticut address of your own to list. A commercial registered agent service provides the in-state address and receives service of process and state notices on the foreign LLC's behalf. With Mainstay, anything served is scanned and uploaded to you the same business day, at no fee.

Because you cannot supply your own Connecticut address from out of state, a commercial registered agent is usually the most realistic option for a foreign LLC, which matters even more when the owners are hundreds of miles away. If you change agents later, the change form is BUS-10 and costs $50.

Foreign qualification runs through the Connecticut Secretary of the State using the Business One Stop portal at business.ct.gov. The application for a foreign LLC results in a Certificate of Authority once approved. Current filing details and fees are on the Secretary of the State's forms and fees page and the foreign LLC knowledge-base article.

What the process typically involves

1. Confirm your name is available in Connecticut. Your LLC's name must be usable in Connecticut and distinguishable from existing entities; if it conflicts, you enter an alternate name for Connecticut use in item 2 of the form, with no separate filing. Check the online business search.
2. Order a certificate of existence (sometimes called a certificate of good standing) from your home state, authenticated by the custodian of corporate records in your formation state. Connecticut's statute has demanded it since January 1, 2025, and the form's instructions add that it must reach the Secretary no more than 90 days after issue. It costs whatever your home state charges. A certified copy of your formation document is not requested.
3. Appoint a Connecticut registered agent who signs to accept the role.
4. File the Foreign Registration Statement through Business.CT.gov, or on paper by mail, with your home-state formation details, principal office, the agent's information, and at least one manager or member. The state fee is $120, the same online or on paper. The form also asks for a company email address and a six-digit NAICS industry code. No notary is needed.
5. Keep your records. Once the state accepts the filing, your LLC is registered as a foreign entity in Connecticut.

Connecticut publishes no standard turnaround, though the Secretary of the State says most filings made on Business.CT.gov are accepted automatically. Gathering the home-state certificate is usually what adds lead time on your end, and an older one will not do.

Getting registered is the start, not the finish. A registered foreign LLC has ongoing Connecticut obligations much like a domestic one.

What continues

• Annual report. A foreign LLC registered in Connecticut files the Connecticut annual report each year, online only, between January 1 and March 31 through Business.CT.gov. The fee is $80. The first one falls in the year after you register. Connecticut sends a reminder email roughly a month before the window closes and publishes no late fee. Even so, a missing report puts the registration at risk of revocation, as does going two months without an agent, and the state must first give you written notice by email.
• Registered agent maintenance. You must keep a valid Connecticut agent at all times. If the agent changes, file the change (form BUS-10, $50) so the record stays accurate.
• Other changes. An amendment for a new name or governing jurisdiction is priced like the original filing ($120). Updating a business address runs $50, while a notice that a manager or member has changed is $20.
• Home-state obligations too. Do not forget that your LLC still has to stay compliant in the state where it was originally formed. Foreign qualification adds Connecticut duties on top of your existing ones; it does not replace them.
• Leaving Connecticut. The exit is the Statement of Withdrawal of Registration (form BUS-042), which costs $120 and needs no tax clearance.

What Mainstay does

Mainstay prepares the Connecticut Foreign Registration Statement and files it with the Secretary of the State. The service costs $199 plus the state's fee. The Connecticut registered agent is included free for the first year, then $149 a year, and anything served on your LLC is scanned and uploaded the same business day at no fee.

The price of the service does not include preparing your annual report or tax filings, and it does not include ordering the certificate of existence from your home state. Mainstay is a filing service and not a law firm. If you are unsure whether your activity even requires qualification, that judgment call is one for an attorney.