Connecticut business filing due dates

The Connecticut deadlines Ordexly tracks for Oct 2026 to Oct 2027. Every date links to the agency page it was checked against (last checked ). Which ones apply to a business depends on its registrations and filing frequency, so confirm with the agency.

Annual report based on formation date

Connecticut corporation annual report (portal/anniversary). CGS §34-247k (LLC Jan 1–before Apr 1); CT SOTS reminder Mar 31 2026 for LLCs; corps due date on portal/anniversary per business.ct.gov KB Official source.

Ordexly works out this date for each business from its formation month.

Annual reports & franchise tax

DueDeadlineSource
Connecticut LLC/LP/LLP Annual Report 2027official source

Sales & use tax

DueDeadlineSource
Connecticut OS-114 sales and use tax return (monthly) Sep 2026official source
Connecticut OS-114 sales and use tax return (quarterly) Q3 2026official source
Connecticut OS-114 sales and use tax return (monthly) Oct 2026official source
Connecticut OS-114 sales and use tax return (monthly) Nov 2026official source
Connecticut OS-114 sales and use tax return (monthly) Dec 2026official source
Connecticut OS-114 sales and use tax return (quarterly) Q4 2026official source
Connecticut OS-114 sales and use tax return (monthly) Jan 2027official source
Connecticut OS-114 sales and use tax return (monthly) Feb 2027official source
Connecticut OS-114 sales and use tax return (monthly) Mar 2027official source
Connecticut OS-114 sales and use tax return (quarterly) Q1 2027official source
Connecticut OS-114 sales and use tax return (monthly) Apr 2027official source
Connecticut OS-114 sales and use tax return (monthly) May 2027official source
Connecticut OS-114 sales and use tax return (monthly) Jun 2027official source
Connecticut OS-114 sales and use tax return (quarterly) Q2 2027official source
Connecticut OS-114 sales and use tax return (monthly) Jul 2027official source
Connecticut OS-114 sales and use tax return (monthly) Aug 2027official source

Payroll & withholding

DueDeadlineSource
Connecticut CT-941 quarterly reconciliation of withholding (quarterly) Q3 2026official source
Connecticut CT-941 quarterly reconciliation of withholding (quarterly) Q4 2026official source
Connecticut CT-941 quarterly reconciliation of withholding (quarterly) Q1 2027official source
Connecticut CT-941 quarterly reconciliation of withholding (quarterly) Q2 2027official source

Unemployment / reemployment

DueDeadlineSource
Connecticut UC-2 unemployment tax return (quarterly) Q3 2026official source
Connecticut UC-2 unemployment tax return (quarterly) Q4 2026official source
Connecticut UC-2 unemployment tax return (quarterly) Q1 2027official source
Connecticut UC-2 unemployment tax return (quarterly) Q2 2027official source

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Nearby: Massachusetts due dates · New York due dates · Rhode Island due dates

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Federal due dates · All states · Connecticut coverage details