The Cost of Forming a Connecticut Corporation

The unavoidable cost to bring a Connecticut corporation into existence is the state filing fee for the Certificate of Incorporation, paid to the Secretary of the State when you file through the Business One Stop portal. That single fee is what legally creates the corporation. The current amount is shown in the cost summary on this page, so it always reflects what the state actually charges.

What the filing fee covers

The filing fee covers the state's processing of your Certificate of Incorporation — recording the corporate name, the authorized shares, the registered agent, and the incorporator, and issuing your stamped formation document. It does not include any of the optional add-ons below, and it is a one-time charge, not a subscription.

What it does not cover

The formation fee is just the state's charge to record the entity. It does not include a registered agent service, an EIN, a business bank account, licenses, or any of the tax registrations you may need to actually operate. Those are separate line items, covered below.

Incorporating is one-time; staying in good standing is annual. Every Connecticut corporation must file an annual report with the Secretary of the State, and there is a state fee for it. The current annual report fee is shown in the cost summary. Connecticut requires this filing to be done online — paper annual reports are not accepted.

Why it matters to budget for it

The annual report fee is small relative to the cost of ignoring it. Falling behind pushes the corporation out of good standing, which can block financing and contracts and eventually requires a more expensive reinstatement to fix. Treat the annual report as a fixed yearly line in your budget, due on the schedule tied to your corporation's formation.

What the annual report is not

It is not a tax and not a financial disclosure. You are not reporting revenue or profit on the annual report — you are confirming your registered agent, principal office, and officer and director information. Your actual tax obligations, federal and state, are separate.

Every Connecticut corporation must have a registered agent, but whether that role costs anything depends on how you fill it. This is the clearest place where a required obligation can be either free or a modest recurring cost.

The free path

If you serve as your own registered agent, or a co-founder or employee does, there is no separate fee — you're using an address you already have. The tradeoffs are that the address becomes public and that you have to be reliably available during business hours to accept legal documents in person.

The paid path

A commercial registered agent charges an annual fee to serve in the role. In exchange you get a professional Connecticut address that keeps your home address off the public record, reliable receipt of legal documents, and prompt notification when something arrives. For many owners the privacy and reliability are worth the recurring cost; for others, serving themselves is fine. Either way, the corporation must have a valid agent at all times.

Beyond formation, the annual report, and the registered agent, several other costs may apply depending on your business. Some are one-time, some recurring, and most are optional or situational.

Common additional costs

• EIN — free. The IRS issues Employer Identification Numbers at no cost. Anyone charging you for the EIN itself is charging for convenience, not for the number.
• Name reservation — optional. If you want to hold a name before filing, Connecticut charges a small fee to reserve it for a limited period.
• Trade name (DBA) — situational. If you operate under a name other than your corporation's legal name, you register a trade name with the town clerk, which has its own fee set at the town level.
• Certified copies and certificates of good standing — as needed. Banks, lenders, and other states often ask for these; the state charges a per-document fee.
• Foreign qualification — if you formed elsewhere and are registering to do business in Connecticut, the Certificate of Authority filing has its own fee.
• Amendments — if you change the corporate name, share structure, or other Certificate details later, an amendment filing carries a fee.
• Licenses and permits — many industries require state or local licensing, each with its own cost and renewal cycle.

A filing service like Mainstay Filing adds a service fee on top of the state's charges — and understanding what that buys is the honest way to think about it. Ours is a single flat yearly fee: it pays to have the Certificate of Incorporation prepared and filed correctly, to have the registered agent role covered continuously, and to have your annual report prepared and filed each year — one price, not a menu of separately renewing charges.

Displayed equals charged

What we show is what you pay. The cost summary on this page reflects the actual state fees, and our service fee is stated separately and up front — there is no markup hidden inside the state's charges and no surprise line item at checkout. If you would rather file everything yourself directly with the state, you can; the state fees are the same either way. What a service saves you is the time and the risk of getting the filing wrong, plus the ongoing work of keeping the corporation compliant.

Deciding what's worth paying for

The formation filing and the annual report are unavoidable state costs. The registered agent is required but can be free if you serve yourself. Everything else — reservations, trade names, expedited handling, a filing service — is a choice about how much convenience, privacy, and peace of mind you want to buy. Budget the required items first, then decide which optional ones are worth it for your situation.