How to Start an LLC in Connecticut

Forming an LLC in Connecticut costs $120 to file your Certificate of Organization with the Connecticut Secretary of the State, with processing typically completed in 3-5 business days. Connecticut is one of the few states that legally requires an operating agreement for LLCs, so you’ll need to create this internal document as part of the formation process. The state’s strong legal protections and strategic Northeast location make it a solid choice for small business owners.

Follow these steps to start your Connecticut LLC in 2026.

How to Start an LLC in Connecticut (6 Steps)

Step 1: Name Your Connecticut LLC

Your Connecticut LLC name must be distinguishable from any existing business entity on file with the Connecticut Secretary of the State. The name must include a designator such as “Limited Liability Company,” “LLC,” or “L.L.C.” You can search for available names using the Connecticut Business Search.

If you find an available name but aren’t ready to file your Certificate of Organization, you can reserve it for 120 days by filing a Name Reservation with the Secretary of the State for $60. This prevents anyone else from registering the same name while you prepare your formation documents.

Before settling on a name, check whether the matching domain name and social media handles are available. You should also search the USPTO trademark database to ensure your desired name doesn’t infringe on an existing trademark.

Connecticut naming rules:

• Must include “Limited Liability Company,” “LLC,” or “L.L.C.”
• Must be distinguishable from other business names on file with the Secretary of the State
• Cannot include words suggesting the LLC is a bank, insurance company, or government entity without proper authorization
• Cannot contain language that is deceptive or implies a purpose the LLC is not authorized to pursue

Step 2: Choose an Agent for Service of Process

Connecticut LLCs are not required to appoint an agent for service of process if the LLC maintains a Connecticut office where it can be served. However, most LLC owners choose to appoint one for privacy and convenience. An agent for service of process (Connecticut’s term for a registered agent) receives legal documents, including lawsuits and official state correspondence, on behalf of your LLC.

You can serve as your own agent if you have a Connecticut address, appoint a trusted individual, or hire a professional registered agent service. If you don’t designate an agent, the Secretary of the State serves as the default agent for your LLC.

Our top recommendation is Northwest Registered Agent ($39/year), which also handles LLC formation for $39 + the $120 state fee. Using a professional service provides privacy, ensures you never miss important legal documents, and keeps your personal address off public filings.

Step 3: File Your Certificate of Organization

To officially create your Connecticut LLC, you need to file a Certificate of Organization with the Connecticut Secretary of the State. The fastest way to file is online through the CONCORD filing system. You can also file by mail, but online filing provides faster processing.

Connecticut’s Certificate of Organization requires basic information about your LLC. You’ll need to specify whether your LLC is member-managed or manager-managed. In a member-managed LLC, all owners participate in running the business. In a manager-managed LLC, designated managers handle day-to-day operations.

Filing details:

• Filing fee: $120
• Online filing: CONCORD (Connecticut Secretary of the State)
• Processing time: 3-5 business days (standard)

Information required:

• LLC name
• Principal office address
• Mailing address
• Agent for service of process name and address (if appointing one)
• Management structure (member-managed or manager-managed)
• Organizer name and address
• Effective date (filing date or future date)

Step 4: Create an Operating Agreement

Connecticut is one of the few states that legally requires LLCs to have an operating agreement. Under Connecticut law, every LLC must adopt an operating agreement, which can be oral, written, or implied. However, a written operating agreement is strongly recommended to avoid disputes and provide clear documentation of your LLC’s governing rules.

Your operating agreement should cover ownership percentages, profit and loss distribution, voting rights, management procedures, and what happens if a member leaves or the LLC is dissolved. Even single-member LLCs should create a written operating agreement to clearly establish the LLC as a separate legal entity. Most banks require a copy of your operating agreement to open a business bank account.

Step 5: Get an EIN

Apply for an Employer Identification Number (EIN) through the IRS website. It’s free and takes about 15 minutes online. An EIN is a nine-digit number assigned by the IRS that acts as your LLC’s tax identification number. You need an EIN to open a business bank account, hire employees, file federal taxes, and apply for business permits. Even single-member LLCs with no employees should get an EIN to protect their personal Social Security Number.

Step 6: File Your Connecticut Annual Report

All Connecticut LLCs must file an annual report with the Secretary of the State. The annual report fee is $80, and it is due during the anniversary month of your LLC’s formation. You can file your annual report online through the CONCORD filing system.

The annual report updates your LLC’s information with the state, including your agent for service of process, principal office address, and member or manager information. Failure to file your annual report can result in administrative dissolution of your LLC. The state sends a reminder, but it’s wise to set your own calendar reminder well in advance of the deadline.

Connecticut LLC Costs

Total first-year cost: $200-$500. This range covers the required filing fee ($120), the annual report ($80), and an optional registered agent service. If you serve as your own agent for service of process, your mandatory first-year costs total $200.

Connecticut LLC Taxes

Connecticut has a graduated state income tax with rates ranging from 3% to 6.99%. LLC profits that pass through to members are subject to Connecticut state income tax on each member’s individual return. The top rate of 6.99% applies to income over approximately $500,000 for single filers. Connecticut also imposes a 6.35% income tax surcharge on adjusted gross income above certain thresholds.

Connecticut imposes a Business Entity Tax (BET) of $250 on LLCs every other year. This biennial tax applies regardless of income or activity level. The BET is due every two years on the anniversary of your LLC’s formation. This is a flat fee, not a percentage of income.

Connecticut has a state sales tax rate of 6.35%, with no additional local sales taxes. Certain luxury items are taxed at 7.75%. If your LLC sells taxable goods or services, you must register with the Connecticut Department of Revenue Services and collect and remit sales tax.

All LLC members also owe federal income tax and self-employment tax (15.3%) on their share of LLC profits, regardless of state tax treatment.

Connecticut LLC Annual Requirements

Connecticut LLCs must file an annual report with the Secretary of the State during the anniversary month of the LLC’s formation. The fee is $80. You can file online through the CONCORD filing system. The report updates your LLC’s agent for service of process, principal office address, and member or manager details.

In addition to the annual report, Connecticut LLCs must pay the Business Entity Tax ($250) every two years. Keep your agent for service of process information current and file amendments if your LLC’s name, management structure, or other key details change. Maintain a written operating agreement as required by Connecticut law, and keep accurate financial records. Failure to file the annual report can result in administrative dissolution.

Best LLC Formation Services for Connecticut

Start an LLC in Another State

Frequently Asked Questions

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

The state filing fee for a Connecticut LLC is $120. Additional costs include the annual report ($80/year), an optional registered agent service ($39-$299/year), and the biennial Business Entity Tax ($250 every two years). Most people spend between $200 and $500 in their first year.

How long does it take to form an LLC in Connecticut?

Standard processing for Connecticut LLC filings takes 3-5 business days when filed online through the CONCORD filing system. Expedited processing may be available for an additional fee. Mail filings take longer, often 1-2 weeks or more.

Do I need a registered agent in Connecticut?

Connecticut does not require an agent for service of process if your LLC maintains an office in the state. However, appointing one is recommended for privacy and convenience. If you don’t designate an agent, the Secretary of the State serves as the default agent for your LLC, but you won’t receive advance notice of legal service.

Does Connecticut require an operating agreement?

Yes, Connecticut is one of the few states that legally requires LLCs to have an operating agreement. The agreement can be oral, written, or implied, but a written agreement is strongly recommended. Your operating agreement should define ownership, profit sharing, management procedures, and dissolution processes. It is also required by most banks to open a business bank account.

How are LLCs taxed in Connecticut?

Connecticut LLCs are taxed as pass-through entities by default. Profits pass through to members and are taxed on individual state income tax returns at graduated rates from 3% to 6.99%. Connecticut also imposes a biennial Business Entity Tax of $250 on LLCs. Members owe federal income tax and self-employment tax (15.3%) on their share of profits.

What is the Connecticut Business Entity Tax?

The Connecticut Business Entity Tax (BET) is a $250 flat fee that LLCs must pay every two years (biennially). It is due on the anniversary of your LLC’s formation, every other year. This tax applies regardless of your LLC’s income or activity level. It is separate from the annual report filing fee.

When is the Connecticut LLC annual report due?

The Connecticut LLC annual report is due during the anniversary month of your LLC’s formation each year. The filing fee is $80. You can file online through the CONCORD filing system. Failure to file can lead to administrative dissolution of your LLC.

Can I be my own agent for service of process in Connecticut?

Yes, you can serve as your own agent for service of process in Connecticut if you have a physical address in the state. Alternatively, you can choose not to designate an agent at all (the Secretary of the State will serve as default), but this means you won’t get advance notice when legal documents are served. Most LLC owners prefer appointing a professional service for privacy and reliability.

Can a non-resident form an LLC in Connecticut?

Yes, you do not need to be a Connecticut resident or a U.S. citizen to form an LLC in Connecticut. If you don’t have a Connecticut office, appointing an agent for service of process is recommended. If you conduct business in another state, you may also need to register your Connecticut LLC as a foreign LLC in that state.