Corporation · Connecticut · 2026

What a corporation really costs in Connecticut

Every state fee and deadline for a corporation in Connecticut, from the official state source, checked October 2026.

To form

$250

Certificate of Incorporation (stock corporation)

First year with the state

~$800

Filing + one round of required reports and minimum taxes

With Incorra

$250

Free filing, state fee at cost. Or $499 with Plus (agent + reports, $249/yr).

Every recurring requirement

  • Connecticut first annual report (Organization and First Report)Once, within 90 days of forming. CGS 33-953(b): corporations formed on/after 1/1/2020 must file the first annual report within 90 days after the certificate of incorporation is filed.$150
  • Connecticut annual reportEvery year in the month you formed (by month-end). Subsequent reports are due on the anniversary of the FIRST annual report filing (i.e. roughly the month the first report was filed, ~0-3 months after the formation month), not the formation date.$150
  • Connecticut corporation business tax return (CT-1120)Every year by May 15. C corporations owe at least the $250 minimum tax; calendar-year returns due May 15 (15th day of 5th month). S corporations are not subject to the corporation business tax.$250

How fast

  • Expedited service (24 hour)+$50

Questions

How much does it cost to form a corporation in Connecticut?

Connecticut charges $250 to file the Certificate of Incorporation (stock corporation).

What does a corporation cost every year in Connecticut?

Connecticut first annual report (Organization and First Report): $150, once, within 90 days of forming (CGS 33-953(b): corporations formed on/after 1/1/2020 must file the first annual report within 90 days after the certificate of incorporation is filed.). Connecticut annual report: $150, every year in the month you formed (by month-end) (Subsequent reports are due on the anniversary of the FIRST annual report filing (i.e. roughly the month the first report was filed, ~0-3 months after the formation month), not the formation date.). Connecticut corporation business tax return (CT-1120): $250, every year by May 15 (C corporations owe at least the $250 minimum tax; calendar-year returns due May 15 (15th day of 5th month). S corporations are not subject to the corporation business tax.).

Can I expedite a corporation filing in Connecticut?

Yes: Expedited service (24 hour) for $50, on top of the filing fee.

What if my corporation was formed in another state?

To do business in Connecticut you register as a foreign entity: Application for Certificate of Authority, $385.

Not sure a corporation is right?

Describe your business and Incorra compares LLC, S-corp and C-corp with your numbers, including the tax when you sell, then files it in Connecticut.

Plan my company free

Source: https://business.ct.gov/knowledge-base/articles/domestic-annual-report-forms-and-fees · verified 2026-10-15. State fees change; Incorra re-checks them regularly. General information, not legal or tax advice.