Connecticut Individual Income Tax Forms (Tax Year 2025)
Connecticut individual income taxes are administered by the Connecticut Department of Revenue Services.
This page provides official resources for Connecticut individual income tax forms for tax year 2025, filed in 2026.
File Connecticut Income Tax Online (2025)
Connecticut provides electronic filing and payment through its official portal.
Taxpayers can file returns, make payments, and manage accounts using
myconneCT.
Quick Links (Official Connecticut Department of Revenue Services)
The official Connecticut Department of Revenue Services website is available at
Connecticut Department of Revenue Services.
General information about individual income tax is available on the
Connecticut resident income tax information page.
Official Connecticut individual income tax forms are available on the
Connecticut individual income tax forms page.
Individual Income Tax Forms (2025)
Connecticut residents file their state income tax return using
Form CT-1040, Connecticut Resident Income Tax Return.
Nonresidents and part-year residents file using
Form CT-1040NR/PY, Connecticut Nonresident and Part-Year Resident Income Tax Return.
Estimated Payments and Amendments (2025)
Estimated individual income tax payments are made using
Form CT-1040ES.
An extension of time to file may be requested using
Form CT-1040EXT.
Previously filed Connecticut individual income tax returns may be corrected using
Form CT-1040X.
Connecticut Individual Income Tax Deadlines (Tax Year 2025)
Connecticut individual income tax returns for tax year 2025 are due April 15, 2026.
Approved filing extensions generally run through October 15, 2026.
Estimated tax payments are generally due on April 15, June 15, September 15, 2026, and January 15, 2027.
Connecticut Taxpayer Resources (2025)
Taxpayers can file, pay, and manage their accounts using
myconneCT.
Additional guidance is available on the
Connecticut income tax guidance page.
Contact information for the Connecticut Department of Revenue Services is available on the
official contact page.
Disclaimer
This page links to official Connecticut Department of Revenue Services resources for informational purposes only.
Tax laws, forms, and filing requirements may change.
Always verify information on the official Connecticut Department of Revenue Services website.
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