Connecticut Tax Deadlines: Individual & Corporate Filing Guide

Connecticut Tax Deadlines: Individual & Corporate Filing Guide

Check Connecticut tax deadlines for individuals and C Corporations. Confirm due dates, extension rules, and exemptions for S Corps and Partnerships.

Connecticut mandates entity-level PTE tax.

Connecticut Tax Deadlines at a Glance (2026)

Entity Type

Return Due

Extension

Individuals

April 15, 2026

October 15, 2026

C Corporations

April 15, 2026

October 15, 2026

S Corporations

March 16, 2026

September 15, 2026

Partnerships

March 16, 2026

September 15, 2026

PTE Tax

Required at entity level with refundable owner credits.

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Trusted by firms across the board

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Trusted by firms across the board

"Research used to be a black hole. Now, I just type the question and get a citable IRS answer in seconds."

Tax Manager

Sama Tributa

"80% faster first drafts. What used to take us two days is now done in two hours."

Managing Partner

Northbridge Tax Advisory