Connecticut Foreign LLC Registration 2026: Certificate of Authority Guide

What Is a Foreign LLC?

A "foreign LLC" is any LLC that was legally formed in one state but wants to operate in another state. The term "foreign" simply means "from another state" — it has nothing to do with operating internationally.

For example, if you formed your LLC in Delaware (a common choice for legal and tax reasons) but your actual business operates in Connecticut — with an office, employees, clients, or regular transactions in Connecticut — then your Delaware LLC is a "foreign LLC" that must register with the Connecticut SOTS.

Registration allows Connecticut to collect applicable taxes, hold your LLC accountable to Connecticut laws, and ensure that Connecticut residents and businesses have legal recourse if your LLC fails to meet its obligations.

When Do You Need to Register a Foreign LLC in Connecticut?

You are generally required to register your foreign LLC in Connecticut if you are "transacting business" in the state. While Connecticut law does not define this term with a bright-line rule, the following activities typically require registration:

• Maintaining a physical office, store, or workspace in Connecticut
• Hiring employees who work in Connecticut
• Owning or leasing real property in Connecticut
• Regularly soliciting and accepting orders for goods or services in Connecticut
• Conducting continuous or repeated business transactions with Connecticut customers

Activities that typically do not require registration include:

• Isolated or one-time transactions in Connecticut
• Holding a meeting of members in Connecticut
• Maintaining a bank account in Connecticut
• Selling through an independent contractor with no Connecticut office

If you are unsure whether your activities require registration, consult a Connecticut business attorney. The cost of legal advice is far less than the penalties for operating unregistered.

Application for Registration: Step-by-Step Process

1. Obtain a Certificate of Legal Existence from your home state — This document (sometimes called a Certificate of Good Standing) proves that your LLC is validly formed and in good standing in its home state. It must be issued within the last 90 days. Obtain it from your home state's Secretary of State office.
2. Choose or appoint a Connecticut registered agent — Your registered agent must have a physical street address in Connecticut and be available during normal business hours. Have the agent's name and address ready before filing.
3. File the Application for Registration online — Visit business.ct.gov and complete the Application for Registration of Foreign LLC. You will need: your LLC's legal name, home state, date of formation, principal office address, registered agent info, and the $120 filing fee.
4. Receive confirmation — The SOTS will process your application and issue a Certificate of Registration. Keep this document — it is proof of your foreign LLC's authority to transact business in Connecticut.
5. Register for Connecticut taxes — After registering your LLC, register with the Connecticut Department of Revenue Services (DRS) for any applicable taxes: income tax withholding (if you have employees), sales tax (if selling taxable goods/services), and any other applicable business taxes.

Required Documents for Connecticut Foreign LLC Registration

• Application for Registration of Foreign LLC — Completed online via business.ct.gov
• Certificate of Legal Existence (Good Standing) — From your home state, issued within 90 days
• Connecticut registered agent information — Name and physical CT street address
• $120 filing fee — Paid online at time of filing

If your LLC's name is already in use in Connecticut by another entity, you may need to use a "fictitious name" (also called an assumed name or trade name) in Connecticut. This is filed separately and requires an additional fee.

Ongoing Requirements After Registration

Once registered as a foreign LLC in Connecticut, you must:

• File annual reports — $80/year, due by the last day of your anniversary month. This is the same anniversary month as your original Connecticut registration date, not your home state formation date.
• Maintain a Connecticut registered agent — Your registered agent must have a valid Connecticut street address at all times. Update the SOTS immediately if your agent changes.
• Pay Connecticut taxes — File Connecticut income tax returns for CT-sourced income. Register for and collect sales tax if applicable.
• Maintain good standing in your home state — Connecticut can revoke your registration if your LLC loses good standing in its home state.
• Notify the SOTS of material changes — Changes to your LLC name, principal office address, or registered agent must be reported to the CT SOTS.

Consequences of Not Registering Your Foreign LLC in Connecticut

Operating a foreign LLC in Connecticut without proper registration exposes you to significant legal and financial risks:

• Civil penalties — Connecticut can assess monetary penalties for the period of unregistered operation
• Back taxes and fees — You may owe all taxes, fees, and annual report fees that would have been due during the unregistered period, plus penalties and interest
• Loss of right to sue in CT courts — An unregistered foreign LLC cannot bring legal action in Connecticut courts to enforce contracts. You can still be sued, but cannot sue others to protect your business interests
• Personal liability risk — Operating without proper registration could be used as evidence that your LLC was not properly maintained, potentially exposing members to personal liability