How to Form an LLC in Connecticut (2026 Complete Step-by-Step Guide)

What Forming an LLC in Connecticut Actually Involves

Forming a Connecticut LLC means filing the Certificate of Organization with the Connecticut Secretary of State and meeting any associated state-specific requirements. The filing creates the entity as a legal business with limited liability protection, separate tax identity, and the right to contract, sue and be sued, hold property, and open a bank account in the entity name. The Certificate of Organization fee is $120, processed by the Connecticut Secretary of State through concord-sots.ct.gov in 7-10 business days standard turnaround.

Connecticut requires the annual report to be filed by March 31 every year, regardless of formation date. This is one of the distinguishing features of forming an LLC in Connecticut. Connecticut does not require a written Operating Agreement, though every LLC should have one to govern member rights and prevent default-statute disputes. Connecticut does not require newspaper publication for LLC formation. The ongoing annual cost after formation is $80.

Why founders choose Connecticut

Three categories of founders form in Connecticut: (1) residents who live and operate in Connecticut and form locally for simplicity, (2) out-of-state founders who choose Connecticut specifically for its formation laws (privacy, tax treatment, court system, fee structure), and (3) founders forming a second entity in Connecticut as part of a multi-state structure. Each pattern has different cost considerations, registered-agent requirements, and ongoing compliance obligations.

What you get when the formation is approved

The Connecticut Secretary of State returns a date-stamped, accepted Certificate of Organization as proof of formation. With this document and the LLC's EIN (separate IRS filing), the entity can open a business bank account, sign contracts, hire employees, qualify in other states as a foreign entity, file federal tax returns, and operate under state-level limited liability protection. Anything done in the entity's name BEFORE the formation date can be problematic, wait for the date-stamped Certificate of Organization before signing material commitments.

How to Form a Connecticut LLC (Step-by-Step)

Connecticut LLC Formation at a Glance

Item	Value
Filing name	Certificate of Organization
Filing agency	Connecticut Secretary of State
State filing fee	$120
Standard processing	7-10 business days
Expedited processing	$50 (24 hours)
Operating Agreement	Not required
Newspaper publication	Not required
Annual fee	$80

The Connecticut LLC formation process is six discrete steps. Following the order below prevents the most common rejection reasons and avoids ordering an EIN before the entity legally exists.

Step 1: Choose and reserve your LLC name

Search the Connecticut business name database to confirm your proposed name is available. The name must include "LLC", "L.L.C.", "Limited Liability Company", or an accepted variation. It cannot be deceptively similar to an existing registered name. Connecticut permits an optional name reservation (typically $25-$75) to lock the name for 120 days while you complete the formation.

Step 2: Designate a registered agent

Connecticut requires every LLC to continuously maintain a registered agent with a physical Connecticut street address (P.O. boxes do not satisfy the requirement). The agent must be available during business hours to accept service of process. File.Business serves as registered agent in Connecticut at $99/year flat with 4-hour mail scan and same-day routing of time-sensitive documents.

Step 3: File the Certificate of Organization

Submit the Certificate of Organization through concord-sots.ct.gov along with the $120 state filing fee. The filing requires: the LLC's legal name; the registered agent name and Connecticut address; the principal business address; the LLC management structure (member-managed or manager-managed); and the signature of an organizer. Expedited processing is available for $50 with 24 hours turnaround.

Step 4: Complete any state-specific post-filing requirements

Connecticut has no post-filing publication requirement, formation is complete once the Certificate of Organization is accepted.

Step 5: Get the LLC's EIN from the IRS

After the Connecticut formation is approved, obtain a federal Employer Identification Number (EIN) from the IRS. The EIN is required to open a business bank account, hire employees, and file federal tax returns. US founders with an SSN can apply online through irs.gov for instant approval. Foreign founders without an SSN apply via fax (Form SS-4) with 4-business-day turnaround.

Step 6: Draft the Operating Agreement

Connecticut does not require a written Operating Agreement by statute, but every LLC should have one. The Operating Agreement governs ownership, management, profit distribution, transfer rules, and dissolution. Without it, Connecticut's default LLC statute governs by deafult, which often produces results the founders did not intend.

Common Connecticut LLC Formation Mistakes

Four mistakes consistently cause delays or rejections for Connecticut LLC formations.

Mistake 1: Name conflicts caught at filing

Connecticut's name database is strict about confusingly similar names. "Acme Holdings LLC" and "Acme Holding LLC" may collide. Run a thorough name search BEFORE submitting the Certificate of Organization, including variations, abbreviations, and similar designators. A rejection on name grounds restarts the formation timeline.

Mistake 2: P.O. box registered agent address

Connecticut requires a physical street address for the registered agent. P.O. boxes, virtual mailboxes, and mail-forwarding services do not satisfy the statute. Filings with non-compliant addresses are rejected. Use a Connecticut resident with a physical address or a commercial registered agent service.

Mistake 3: Getting an EIN before the LLC exists

The IRS issues EINs based on a representation that the entity exists. Applying for an EIN BEFORE the Connecticut Certificate of Organization is approved creates a mismatch between the IRS records and the Connecticut record. Wait for the date-stamped Certificate of Organization acceptance before applying for the EIN.

Mistake 4: Skipping the Operating Agreement

Many founders form an LLC and never draft an Operating Agreement. Without one, default Connecticut statutes govern, equal voting rights regardless of capital contribution, no transfer restrictions, automatic dissolution on member death. Draft the Operating Agreement before the LLC has any real activity.

How File.Business Forms Connecticut LLCs

File.Business runs Connecticut LLC formations end-to-end at $0 service fee plus the $120 state filing fee. We search the Connecticut name database to confirm availability, prepare the Certificate of Organization, designate File.Business as Connecticut registered agent at $99/year flat, file through concord-sots.ct.gov, pay all state fees, monitor processing, deliver the approved Certificate of Organization to your document vault, order your EIN from the IRS, and draft an Operating Agreement template customized to your member structure. Total first-year cost: $120 state fee + $99 registered agent + $80 annual report (if applicable).

Why founders choose File.Business for Connecticut

Three reasons: (1) $0 service fee on formation, pay only the state fee, no upsells, no hidden charges; (2) Flat $99/year registered agent with no renewal escalation, predictable cost across the entity's life; (3) Integration with the broader compliance system, annual report reminders, document vault, compliance score, multi-entity dashboard, so Connecticut formation is the entry point to a complete compliance platform rather than a one-off transaction.

Frequently Asked Questions

How much does it cost to form an LLC in Connecticut?

The Connecticut Certificate of Organization state filing fee is $120. Additional first-year costs may include: a registered agent service ($99-$300/year for commercial providers), publication costs (where required), and the EIN (free direct from the IRS). File.Business charges $0 service fee on formation, pay only the state fee.

How long does Connecticut LLC formation take?

Standard Connecticut processing is 7-10 business days. Expedited processing is 24 hours for $50.

Does Connecticut require an Operating Agreement?

No. Connecticut does not statutorily require a written Operating Agreement, but every LLC should have one. Without it, Connecticut's default LLC statute governs ownership, management, distributions, transfers, and dissolution, typically producing results the founders did not intend.

Does Connecticut require newspaper publication for LLC formation?

No. Connecticut has no publication requirement for LLC formation.

What ongoing fees does a Connecticut LLC pay?

Connecticut LLCs pay $80 annually for ongoing compliance (annual report or equivalent). Federal taxes, registered agent fees, and any state-level franchise taxes are separate.

Can I form an LLC in Connecticut if I don't live in Connecticut?

Yes. Connecticut allows non-residents to form LLCs. The LLC needs a Connecticut registered agent (commercial service satisfies this) and a designated Connecticut address for the registered agent. The LLC owners can live anywhere, including outside the United States.

Can File.Business form my Connecticut LLC?

Yes. File.Business runs Connecticut LLC formations end-to-end at $0 service fee + $120 state fee: name search, Certificate of Organization preparation and filing, Connecticut registered agent at $99/year flat, IRS EIN ordering, Operating Agreement template, and enrollment in our compliance monitoring system for ongoing Connecticut obligations.