Forms Library

Connecticut resident individual income tax return. The primary form for Connecticut residents to file state income taxes.

Connecticut application for extension of time to file individual income tax return.

Connecticut tax calculation schedule used with Form CT-1040 to compute tax liability.

Connecticut nonresident and part-year resident income tax return for individuals who moved into or out of Connecticut during the tax year.

Connecticut amended income tax return for individuals who need to correct a previously filed CT-1040.

Connecticut employee withholding certificate, the state equivalent of federal W-4. Used to determine Connecticut income tax withholding.

Connecticut withholding certificate for nonresident employees who apportion income earned in Connecticut.

Connecticut withholding certificate for pension, annuity, and other retirement distributions.