Connecticut: Foreign LLC Registration and Qualification Requirements

Requirements one by one

Trigger and safe harbors

Conn. Gen. Stat. § 34-243 names the governing scheme the Connecticut Uniform
Limited Liability Company Act. Section 34-275a(a) says a foreign LLC “may not transact business in
this state until it registers” with the Secretary of the State. Conn. Gen. Stat. § 34-275d
then excludes proceedings and settlements, internal affairs, bank accounts,
offices and fiduciaries for the LLC's own securities, independent-contractor
sales, orders requiring outside acceptance, indebtedness and secured-credit
activity, owning property “without more,” voting equity interests, interstate
commerce, and certain passive ownership or member-manager relationships.

The isolated-transaction exclusion has no fixed day count. It applies when
the transaction is not in the course of similar transactions. For activities
outside the listed exclusions, Chapter 613a does not define the outer boundary,
so the remaining qualification question is fact-specific. The exclusions also
do not decide tax, service-of-process, or other regulatory contacts.

Application, evidence, and agent

Conn. Gen. Stat. § 34-275b requires the LLC's real and any alternate Connecticut name,
foreign-LLC status and governing jurisdiction, principal-office street and
mailing addresses, any office required in the home jurisdiction, registered
agent and acceptance, one manager's or member's business and residence
addresses, a valid email address, and a NAICS code. The current paper form also
asks for the formation date and the date Connecticut business began or will
begin. An authorized official signs subject to the penalty for false statement.

Under § 34-275e, a noncomplying real name must be replaced with a compliant
Connecticut alternate name before registration. The filing must also include an authenticated home-state certificate of existence or
similar record. The statute itself sets no age, but the current form says the
Secretary must receive the certificate within 90 days after issuance.

The company may appoint the Secretary of the State, a Connecticut-resident
individual, or one of the domestic or Connecticut-qualified entity types listed
on the form. A non-Secretary agent signs an acceptance, and § 34-243n(e)
requires the agent to have a Connecticut place of business.

Filing, fee, and effect

The Secretary's current page supports online filing through Business.CT.gov and
also links the paper form. Conn. Gen. Stat. § 34-243u(a)(12) sets the base fee at
$120. Under § 34-247f, the foreign registration certificate becomes
effective at the date and time the Secretary files it; unlike other records in
that section, it does not receive the delayed-effective-date option.

Operating without registration

Section 34-275a bars an unregistered foreign LLC from maintaining a Connecticut
action until it registers, but preserves its defense rights, contracts, other
acts, and member or manager liability limits. Transacting business without the
certificate also appoints the Secretary of the State for service on a claim
arising from that business.

The company owes the fees and taxes that would have applied, plus statutory
interest and penalties. A separate $300 penalty applies for each month or part
of a month, but an LLC that registers within 90 days after starting
Connecticut business avoids that monthly penalty. The Attorney General may
recover the charges, and a court finding a violation must enjoin further
business until the civil penalties, interest, court costs, and registration
requirements are satisfied.

What trips people up

• The 90-day grace protects only against the $300 monthly penalty. It does not
  postpone the requirement to register before transacting business or erase
  back fees, taxes, interest, and other penalties.
• Connecticut gives no numeric duration for an isolated transaction. Repeated
  similar transactions fall outside that exclusion even if each is short.
• The form's “began / will begin” date records the business-start date. It is
  not a delayed effective date for the registration certificate.

Common questions

Does merely owning Connecticut property require registration?

Not by itself. Section 34-275d(a)(10) excludes owning property “without more.”
Additional activities must be assessed separately against the other exclusions
and the statute's undefined outer boundary.

Does the safe-harbor list also settle Connecticut tax nexus?

No. Section 34-275d(c) expressly says the list does not determine contacts for
taxation, service of process, or regulation under another Connecticut law.

Statutes and sources

• Conn. Gen. Stat. Chapter 613a — short title, registration trigger, safe harbors, application and evidence, alternate name, agent, fee, effective date, and unregistered consequences (accessed July 27, 2026; checked against the official 2026 supplement).
• Connecticut SOTS Foreign Registration Statement — current application fields, agent choices, 90-day evidence instruction, signature, and paper filing (rev. 1/2024; accessed July 27, 2026).
• Connecticut SOTS Foreign LLC Forms and Fees — online and paper routes and $120 fee (accessed July 27, 2026).