Start a Business in Connecticut

Connecticut does not sell itself as a tax haven, and it would be dishonest to pretend otherwise — the state levies a graduated personal income tax and a corporation business tax, so the pitch here is different from a no-income-tax state. What Connecticut offers instead is location, infrastructure, and a genuinely streamlined registry. A company headquartered in Hartford, Stamford, or New Haven sits inside one of the wealthiest consumer markets in the country, with easy reach into the New York and Boston metros and a workforce that skews heavily toward finance, insurance, healthcare, and advanced manufacturing.

The filing side has improved a great deal in recent years. The Connecticut Secretary of the State, Business Services Division now runs everything through a consolidated online portal at business.ct.gov, commonly called the CT Business One Stop. You create formation documents, pay state fees, and later file your annual report through that one account. Name searches run through the state's free online business search, and standard online filings are typically processed within a few business days rather than the weeks that paper submissions can take.

One quirk worth knowing up front: Connecticut retired its old flat Business Entity Tax in 2020, so the recurring cost of keeping most entities alive is now the annual report itself rather than a separate standalone tax. That change simplified the ongoing math for small businesses considerably, and it is one reason the state is friendlier to solo operators and small partnerships than its reputation sometimes suggests. The tradeoff is that Connecticut expects you to keep your public record accurate and current, which is where the annual report comes in.

Connecticut recognizes five formation types. They are not interchangeable — each carries a different liability arrangement, a different tax default, and a different level of ongoing formality. Here is the plain-language version.

LLC — the flexible default

A limited liability company is what most new Connecticut businesses become, and for good reason. It draws a line between your personal assets and the company's debts, its profits pass through to your own tax return by default so you avoid a second layer of entity-level tax, and it asks very little of you in the way of meetings, minutes, or internal ceremony. Whether you are a single consultant in Fairfield County or four partners opening a shop together, the LLC stretches to fit. When you genuinely do not know which structure you need, this is the honest starting point.

Corporation — built to raise money and issue stock

A corporation exists to hold shareholders, issue stock, seat a board, and act through officers. That formality is a feature, not a bug, when outside capital is involved: venture investors, angel groups, and employee option pools are all built around corporate shares, and Connecticut's insurance and life-sciences investors expect to see a C-corp on the cap table. If you plan to raise a priced round, grant equity to early hires, or one day exit, this is the vehicle designed for it.

LP — a general partner plus passive investors

A limited partnership joins one general partner, who runs the business and carries the liability, with limited partners who put in money but stay out of management. It is the classic structure behind real-estate deals, investment funds, and family holdings where some people manage and others simply fund. The limited partners' exposure is capped at what they invest, provided they stay out of day-to-day control.

LLP — a shield for professional partners

A limited liability partnership is a general partnership with an added liability shield, so no partner is personally on the hook for another partner's malpractice or negligence. In Connecticut it is the standard choice for licensed professionals practicing together — law firms, accounting practices, architecture and medical groups — who want to share a firm without sharing one another's individual liability.

Nonprofit — a mission with no owners

A nonprofit corporation has no shareholders and issues no stock; it exists to advance a charitable, educational, religious, or civic purpose. Forming one with the state is the first step, and it is separate from the second: applying to the IRS for 501(c)(3) federal tax-exempt status. Incorporating in Connecticut gives you the legal shell; the exemption, the grant eligibility, and the deductible donations come afterward through a distinct federal process.

You can usually settle the decision by answering a handful of honest questions in order.

Will you raise venture capital or hand out stock options? If yes, form a corporation. Investors and option plans run on corporate shares, and converting an LLC into a C-corp later is more expensive and disruptive than simply starting as one.

Are you licensed professionals opening a practice together? An LLP gives each partner a shield against the others' liabilities while preserving the pass-through simplicity and flexibility of a partnership.

Do you have backers who want to fund the business but not run it? A limited partnership lets a general partner manage while limited partners contribute capital and keep their exposure capped.

Are you building something mission-driven rather than profit-seeking? A nonprofit corporation is the structure that opens the door to federal tax exemption, foundation grants, and tax-deductible donations.

Everything else, or still deciding? Form an LLC. It protects your personal assets, keeps both taxes and paperwork light, and covers the overwhelming majority of small and growing Connecticut businesses. Crucially, an LLC does not lock you in — if the business later takes off, you can elect S-corp tax treatment or reorganize entirely without unwinding what you built.

The dollar differences between these types come mostly from the state's filing and annual-report fees, which vary by entity. Each entity page on this site lists Connecticut's current filing fee next to our service price, so you can compare the real numbers side by side before you commit to a structure.

Whichever entity you land on, the sequence of steps is broadly the same, and none of them is complicated once you know the order.

1. Choose and clear a name

Your name has to be distinguishable from every other entity already on file with the state. Run it through the Connecticut business search first — it is free and instant. Each entity type carries its own required designator, such as "LLC," "Inc.," "L.P.," or "LLP," and certain regulated words are restricted. Note that a trade name or DBA in Connecticut is a separate matter entirely: it is filed with your town clerk, not with the Secretary of the State, which surprises a lot of first-time owners.

2. Appoint a registered agent

Connecticut requires every entity to name a registered agent with a physical Connecticut street address who is available during business hours to accept legal service and official state mail. You can act as your own agent, but many owners hire a commercial service to keep their home address off the public record and to make sure a lawsuit or state notice is never missed because they were out of the office.

3. File your formation document

This is the Certificate of Organization for an LLC, the Certificate of Incorporation for a corporation or nonprofit, or the equivalent certificate for a partnership. You submit it through business.ct.gov, pay the state fee, and the entity legally exists the moment the filing is accepted — usually within a couple of business days for online submissions.

4. Get an EIN

An Employer Identification Number is your business's federal tax ID. The IRS issues it for free, and you need it to open a business bank account, hire employees, and file returns. Any service that charges you to "obtain" an EIN is billing you for something the government gives away at no cost.

5. Set up governance and stay compliant

Depending on the entity, that means an operating agreement, corporate bylaws, or a partnership agreement — the internal rulebook that governs who decides what. Then there is Connecticut's recurring obligation: the annual report. Every registered entity files one through business.ct.gov to stay in good standing, and Connecticut accepts these online only — paper annual reports are rejected. For an LLC the report is due by March 31 each year; corporations, LPs, LLPs, and nonprofits file on the anniversary of their formation. Miss it and your entity can fall out of good standing and eventually face administrative dissolution, so it is the one deadline worth putting on the calendar the day you form.