NOTICE: Taxpayers are strongly encouraged to visit the DRS website for answers to many questions. You may also email DRS at drs@po.state.ct.us. If contacting DRS by phone, please plan for wait times that may be longer than usual. See DRS FAQ's, which now include important information regarding Connecticut sales tax. Frequently Asked Questions

Business Entity Prior Years 

Name

Type

Description

OP-424

Form & Instr.

2015-2016 Business Entity Tax Return

OP-424

Form & Instr.

2013-2014 Business Entity Tax Return

OP-424

Form & Instr.

2012 Business Entity Tax Return

OP-424

Form & Instr.

2011 Business Entity Tax Return

OP-424

Form & Instr.

2010 Business Entity Tax Return

OP-424

Form & Instr.

2009 Business Entity Tax Return

OP-424

Form & Instr.

2008 Business Entity Tax Return

OP-424

Form & Instr.

2007 Business Entity Tax Return

OP-424

Form & Instr.

2006 Business Entity Tax Return

OP-424

Form & Instr.

2005 Business Entity Tax Return

OP-424

Form & Instr.

2004 Business Entity Tax Return

OP-424

Form & Instr.

2003 Business Entity Tax Return

OP-424

Form & Instr.

2002 Business Entity Tax Return

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