Connecticut LLC Formation Requirements: A Complete Guide

Quick Answer: Forming an LLC in Connecticut

Here are the core steps to form a Connecticut LLC, in order:

1. Search and confirm your LLC name is available through the Connecticut Secretary of State (SOS) business name database.
2. Designate a registered agent with a physical Connecticut street address who is available during normal business hours.
3. File the Certificate of Organization with the Connecticut SOS, either online through the Business One Stop portal or by mail.
4. Pay the filing fee. The current fee for filing a Certificate of Organization is $120 (Connecticut Secretary of State, Business Services Division).
5. Draft an Operating Agreement. This is not filed with the state but is legally significant under Connecticut law.
6. Obtain an EIN from the IRS if your LLC has more than one member, has employees, or elects corporate tax treatment.
7. Register for state taxes with the Connecticut Department of Revenue Services (DRS) as applicable.

The Connecticut Secretary of State processes most formation filings. Online submissions are typically processed immediately. Mail filings take longer; consult the Connecticut SOS Business Services Division for current processing times if a specific effective date is required.

Choosing and Reserving Your Connecticut LLC Name

Your LLC name is a legal identifier. Connecticut has specific naming rules; violations result in filing rejection.

Naming Requirements

Under Connecticut General Statutes (C.G.S.) §34-102, your LLC name must:

• Contain the words "Limited Liability Company," "Limited Company," or one of the abbreviations "LLC," "L.L.C.," "LC," or "L.C."
• Be distinguishable from any other business entity name already on record with the Connecticut SOS.
• Not imply the LLC is organized for a purpose other than what is permitted under its Certificate of Organization.

Prohibited and Restricted Words

Certain words require additional approval or are prohibited. Words suggesting affiliation with a government agency (e.g., "FBI," "Treasury," "State Department") are not permitted. Terms like "Bank," "Insurance," "University," or similar terms tied to licensed professions or regulated industries require prior approval from the relevant state agency or proof of licensure before the SOS will accept the filing. Consult the Connecticut SOS Business Services Division for the current list of restricted words.

Checking Name Availability

Search the Connecticut SOS Business Name Search tool at ct.gov/sots for availability. While database availability is a primary filter, the SOS applies a distinguishability standard that involves judgment.

Reserving a Name

If you are not ready to file immediately, you can reserve an available name for 120 days by filing a Name Reservation application with the Connecticut SOS. The current reservation fee is $60 (Connecticut Secretary of State, Business Services Division). This prevents another entity from registering the same name while you finalize your formation documents.

Filing Your Connecticut Certificate of Organization

The Certificate of Organization legally creates your LLC in Connecticut.

Required Information

Under C.G.S. §34-120, the Certificate of Organization must include:

• The name of the LLC, complying with §34-102.
• The name and address of the registered agent in Connecticut.
• The name and address of each organizer (the person or persons signing and filing the document).
• The effective date, if you want the LLC to become active on a date other than the filing date. If no effective date is specified, the LLC is effective upon filing.
• A statement of the nature of the business or the general purposes for which the LLC is organized (a broad statement such as "any lawful business" is acceptable).

How to File

Online: The Connecticut SOS Business One Stop portal (business.ct.gov) accepts online filings. This is the fastest method and processes immediately in most cases.

By mail: Download the Certificate of Organization form from the Connecticut SOS website, complete it, and mail it with a check or money order payable to the "Secretary of the State" to the Business Services Division. Mail processing times vary. Consult the Connecticut SOS for current mail processing windows.

The SOS rejects filings with errors, omissions, or non-compliant names. Rejected filings delay formation and may impact name reservations. Double-check all information before submission.

Filing Fees

Source: Connecticut Secretary of State, Business Services Division. Fees are subject to change. Verify the current fee at ct.gov/sots before submitting payment.

Connecticut Registered Agent Requirements

Connecticut LLCs must maintain a registered agent at all times. Failure to do so risks administrative dissolution.

What a Registered Agent Does

The registered agent is the official point of contact for service of process, meaning lawsuits and legal notices, as well as official communications from the state. The registered agent receives service of process for lawsuits and official state communications.

Eligibility Requirements

Under C.G.S. §34-104, a Connecticut LLC's registered agent must:

• Have a physical street address in Connecticut (a P.O. box is not sufficient as the registered office address).
• Be available during normal business hours to accept service of process and official documents.
• Be either an individual who is a Connecticut resident, or a business entity that is authorized to do business in Connecticut.

Your Options

You or a member of the LLC: Any individual with a Connecticut street address can serve as the registered agent. Many single-member LLC owners list themselves. The downside is that your address becomes a public record in the SOS database, and you must be physically present at that address during business hours.

A Connecticut-based attorney or accountant: A professional with a Connecticut office can serve as your registered agent, which keeps your personal address off the public record.

A commercial registered agent service: Numerous companies specialize in registered agent services. Fees vary by provider. Using a commercial service is common for owners who work remotely, travel frequently, or simply want privacy. Consult the Connecticut SOS for a list of entities registered to provide this service in Connecticut.

Consequences of Non-Compliance

If your LLC loses its registered agent and fails to appoint a replacement, the Connecticut SOS can administratively dissolve the LLC under Connecticut General Statutes Chapter 613. Reinstatement is possible but involves additional filings and fees.

Operating Agreements, EINs, and Initial Compliance for CT LLCs

After Certificate of Organization approval, the Operating Agreement and EIN are essential before conducting business or opening a bank account.

The Operating Agreement

Connecticut law addresses Operating Agreements under C.G.S. §34-108. The Operating Agreement is the internal governance document for your LLC. It is not filed with the Connecticut SOS, but it carries significant legal weight.

A well-drafted Operating Agreement should cover:

• Ownership structure: Percentage interests held by each member.
• Capital contributions: What each member put in and what happens if more capital is needed.
• Profit and loss allocation: How earnings and losses are divided.
• Management structure: Whether the LLC is member-managed or manager-managed, and who has authority to bind the LLC in contracts.
• Voting rights: What decisions require unanimous consent versus a majority.
• Transfer restrictions: What happens if a member wants to sell their interest or dies.
• Dissolution procedures: How the LLC winds down if the members decide to close it.

Without an Operating Agreement, Connecticut's default LLC rules under Chapter 613 govern your LLC's internal operations. Those defaults may not match what you and your co-members actually intend. For a single-member LLC, an Operating Agreement still matters because it reinforces the separation between you and the entity, which is relevant if your liability protection is ever challenged.

Employer Identification Number (EIN)

An EIN is a federal tax identification number issued by the IRS at no cost. You need one if your LLC:

• Has more than one member (multi-member LLCs are treated as partnerships by default under IRS rules).
• Has or plans to hire employees.
• Elects to be taxed as a corporation (C-corp via IRS Form 8832, or S-corp via IRS Form 2553).

Single-member LLCs with no employees and no corporate tax election can technically use the owner's Social Security Number for federal tax purposes. In practice, most banks require an EIN to open a business checking account regardless of your LLC's structure.

How to get an EIN: Apply online through the IRS website (irs.gov) using the EIN Assistant. The online application is available for entities whose principal business is located in the United States, and you receive your EIN immediately upon completion. You can also apply by mail or fax using IRS Form SS-4. Consult IRS Form SS-4 instructions and IRS Publication 3402 (Taxation of Limited Liability Companies) for full details on tax classification options.

Initial Member Resolutions

Members should hold an initial meeting or execute written resolutions to document key decisions, such as bank account authorization, contract signing authority, and initial capital contributions. These records are maintained in the LLC's internal files.

Ongoing Compliance: Annual Reports and State Taxes in Connecticut

Annual Report

Under C.G.S. §34-106, Connecticut LLCs must file an annual report with the Secretary of State. Key details:

The annual report updates the SOS on the LLC's current registered agent, principal office address, and member or manager information. It is not a financial disclosure.

Consequence of non-filing: Failure to file the annual report by the deadline can result in administrative dissolution of the LLC under Connecticut General Statutes Chapter 613. A dissolved LLC loses its liability protection and its right to use its name. Reinstatement requires filing the overdue reports, paying the fees, and potentially paying a reinstatement fee. Consult the Connecticut SOS for current reinstatement procedures and costs.

State Tax Obligations

Connecticut LLCs face several potential state-level tax obligations depending on their activities and structure.

Business Entity Tax (BET): Connecticut previously imposed a Business Entity Tax on LLCs and other pass-through entities. However, the Connecticut General Assembly repealed the Business Entity Tax effective for income years beginning on or after January 1, 2020 (Connecticut Department of Revenue Services). As of the date of this writing, the BET no longer applies. Confirm the current status with the Connecticut DRS before assuming no BET liability, particularly if your LLC was formed before 2020 and has open prior-year obligations.

Pass-Through Entity Tax (PET): Connecticut enacted a Pass-Through Entity Tax under C.G.S. §12-699. Multi-member LLCs taxed as partnerships, and LLCs taxed as S-corporations, may be subject to this tax. The PET was designed in part to allow members to claim a corresponding credit on their Connecticut personal income tax returns. Consult the Connecticut DRS for current PET rates, filing requirements, and whether your LLC must register and file.

Sales and Use Tax: If your LLC sells taxable goods or services in Connecticut, you must register with the Connecticut DRS for a Sales and Use Tax permit and collect and remit sales tax. Registration is done through the DRS myconneCT portal (myCTReg).

Connecticut Income Tax: Members of a Connecticut LLC who are Connecticut residents, or who earn Connecticut-source income through the LLC, are subject to Connecticut personal income tax on their distributive share of LLC income. The LLC itself files an informational return if it is taxed as a partnership. Consult the Connecticut DRS for current forms and filing requirements.

Record-Keeping: Maintain accurate financial records, meeting minutes or written resolutions, and copies of all state and federal filings. Connecticut's statute of limitations for tax assessments means you should retain records for at least the applicable period. Consult the Connecticut DRS for specific retention guidance.

Federal Tax Considerations

When forming an LLC in Connecticut, it's essential to understand the federal tax implications. A single-member LLC is treated as a disregarded entity, reporting income on Schedule C, while a multi-member LLC is classified as a partnership and must file Form 1065 along with issuing K-1s to members. Additionally, an S-corporation election can be made via Form 2553, potentially altering self-employment tax exposure.

• Single-member LLCs report income on Schedule C per IRC § 703.
• Multi-member LLCs file Form 1065, reporting income and deductions under IRC § 702.
• Members receive K-1s detailing their share of income, losses, and deductions as per IRC § 703.
• An S-corp election via Form 2553 can reduce self-employment taxes on distributions (IRC § 1362).
• Self-employment tax is 15.3% on active LLC income, up to the Social Security wage base (IRC § 1401).
• The Qualified Business Income deduction under IRC § 199A allows for up to a 20% deduction of qualified pass-through income, subject to income thresholds and SSTB rules.

This is not tax advice — consult a CPA familiar with LLC formation for your specific situation.

Frequently Asked Questions

What is the cost to file the Certificate of Organization in Connecticut?

The filing fee for the Certificate of Organization is $120, as stated by the Connecticut Secretary of State.

How long does it take to process an LLC formation in Connecticut?

Online submissions are typically processed immediately, while mail filings may take longer. For specific processing times, consult the Connecticut Secretary of State's Business Services Division.

Can I reserve my LLC name in Connecticut, and what is the fee?

Yes, you can reserve an available name for 120 days by filing a Name Reservation application, which costs $60.

Are there any specific naming rules I need to follow for my LLC in Connecticut?

Yes, your LLC name must include 'Limited Liability Company' or an abbreviation, be distinguishable from existing names, and not imply unauthorized purposes. Certain words also require additional approval.

What should I do if my desired LLC name is already taken in Connecticut?

If your desired name is not available, you will need to choose a different name that complies with Connecticut's naming requirements and is distinguishable from existing entities.

Do I need an Operating Agreement for my LLC in Connecticut?

While it is not required to file an Operating Agreement with the state, it is legally significant and highly recommended to outline the management and operational procedures of your LLC.

Next Steps and Official Resources for Connecticut LLCs

Connecticut Secretary of State, Business Services Division

• Website: ct.gov/sots
• Online filing portal: business.ct.gov
• Phone: Consult the Connecticut SOS website for current contact numbers and hours, as these change periodically.
• Mailing address for paper filings: Connecticut Secretary of State, Business Services Division, P.O. Box 150470, Hartford, CT 06115-0470. Verify the current address at ct.gov/sots before mailing.

Use the SOS portal for: name searches, name reservations, Certificate of Organization filings, annual report filings, and registered agent updates.

Connecticut Department of Revenue Services

• Website: portal.ct.gov/DRS
• Online portal: myconneCT (myCTReg for new registrations)
• Phone: Consult the DRS website for current contact numbers.

Use the DRS for: sales tax registration, Pass-Through Entity Tax filings, income tax questions, and any questions about the former Business Entity Tax and whether prior-year obligations apply to your LLC.

Local Licenses and Permits

State formation does not substitute for local compliance. Depending on your business type and location, you may need:

• A local business license from your city or town clerk's office.
• Zoning approval if you are operating from a physical location or a home office.
• Professional licenses from the relevant Connecticut state licensing board if your LLC provides licensed services (law, medicine, engineering, real estate, and similar fields).

There is no single statewide database for local permits. Contact the town clerk or municipal office in the city or town where your LLC will operate.

Get Professional Help

A Connecticut business attorney can draft an Operating Agreement that reflects your intentions and holds up if a dispute arises. A Connecticut CPA or tax professional can advise on the PET election, federal entity classification, and whether an S-corp election makes sense for your situation.