Connecticut LLC annual report & franchise tax deadlines 2026-2027
Every recurring Connecticut filing for LLCs, S corps and C corporations — due dates, fees and the official source for each. Last verified Oct 21, 2026.
LLC
| Report | Annual Report Confirmed on official page |
|---|---|
| Due | Between Jan 1 and Mar 31 each year (online) |
| State fee | $80 |
| How often | annual |
Corporation (C & S corp)
| Report | Annual Report Confirmed on official page |
|---|---|
| Due | Annually on the anniversary of the first annual report (first one within 90 days of incorporation for corps formed 2020+) |
| State fee | $150 |
| How often | annual |
Franchise & entity-level taxes
| No separate statewide franchise or entity-level tax listed for this state. |
State income & estimated tax
| Corporate income tax | Yes |
|---|---|
| C corp return | May 15 (CT-1120, 15th day of the month after the federal due date) |
| Partnership / S corp return | Mar 15 (pass-through entity tax return CT-1065/CT-1120SI) |
| Corporate estimates | Apr 15, Jun 15, Sep 15, Dec 15 (follows the federal corporate schedule) |
General pattern — verify Calendar-year pattern; confirm with the revenue department.
Sales tax
Filing frequency (monthly, quarterly or annual) is assigned by the state based on your tax liability. Returns are generally due the last day of the month after the reporting period.
General pattern — verify Your assigned frequency and due day appear in your state tax account.
IRS disaster postponements in Connecticut
No active IRS disaster postponements for Connecticut as of Oct 21, 2026. See all deadline changes.
Your Connecticut calendar
Add your formation month/year to date anniversary-based reports. Calendar-year filers; weekend and federal-holiday dates roll to the next business day.
Upcoming deadlines
Not tax advice — verify each date with the linked source. Fiscal-year filers' dates differ.
Tools that help you stay compliant
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Connecticut deadline FAQ
When is the Connecticut LLC annual report due?
Between Jan 1 and Mar 31 each year (online).
How much does the Connecticut LLC annual report cost?
State fee: $80.
When is the Connecticut corporation annual report due?
Annually on the anniversary of the first annual report (first one within 90 days of incorporation for corps formed 2020+). Fee: $150. S corporations file the same report as other corporations.
Does Connecticut have a franchise tax or annual LLC tax?
We don't list a separate statewide franchise or entity-level tax for Connecticut. Income and sales taxes may still apply.
When are Connecticut business income tax returns due?
C corporations: May 15 (CT-1120, 15th day of the month after the federal due date). Pass-through entities (partnerships, S corps): Mar 15 (pass-through entity tax return CT-1065/CT-1120SI). These are general calendar-year patterns — confirm with the state revenue department.
How often do I file Connecticut sales tax?
Filing frequency (monthly, quarterly or annual) is assigned by the state based on your tax liability. Returns are generally due the last day of the month after the reporting period.
What happens if I miss a Connecticut deadline?
Most states charge a late fee or penalty and interest, and an entity that keeps missing its annual report can lose good standing and eventually be administratively dissolved. Check the official source for the exact penalty and reinstatement steps.
Official sources
- https://business.ct.gov/knowledge-base/articles/domestic-annual-report-forms-and-fees
- https://portal.ct.gov/drs
- https://business.ct.gov/
- https://business.ct.gov/knowledge-base/articles/annual-report/overdue-annual-report
- https://portal.ct.gov/sots/business-services/bsd
Federal dates: IRS Publication 509. Disaster relief: IRS tax relief in disaster situations.
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