Connecticut Tax Deadlines

When are taxes due in Connecticut?

Connecticut state income tax returns for 2025 are generally due on April 15, 2026, aligning with the federal deadline. However, some entity types such as partnerships and S-corporations have earlier deadlines (March 16, 2026). Check the deadlines above for your specific entity type.

Does Connecticut require estimated tax payments?

Yes, Connecticut generally requires estimated tax payments if you expect to owe more than a certain threshold in state income tax. Payments typically follow a quarterly schedule. Visit the estimated payments page for Connecticut for specific due dates.

What is the Connecticut tax extension deadline?

Connecticut generally grants a 6-month extension for filing state income tax returns, moving the deadline to October 15, 2026 for most individual filers. Note that an extension to file is not an extension to pay — any tax owed is still due by the original deadline.

What are the Connecticut tax rates for 2026?

Connecticut tax rates vary by income level and filing status. For the most current rates and brackets, visit Connecticut Department of Revenue Services at https://portal.ct.gov/DRS. Tax rates can change annually based on state legislation.

Does Connecticut conform to federal due dates?

Many Connecticut deadlines follow the federal calendar. Always confirm on Connecticut Department of Revenue Services.

Where can I file Connecticut tax forms?

Visit Connecticut Department of Revenue Services at https://portal.ct.gov/DRS for official forms and e-file options.