1120 Connecticut electronic filing information

State contact information

If you have specific questions about what you can e-file or about rejections you received, contact the state for more information.

Connecticut Department of Revenue Services - Electronic Commerce Unit

25 Sigourney St., Suite 2

Hartford, CT 06106-5032

Email
: Jim.Annino@po.state.ct.us

Phone
: 860-297-4713

Grace period	5 days
E-filing mandate	All corporate returns and their associated payments other than Form OP-424.
Accepts state-only filings	Yes
Return types accepted	C Corporation S Corporation Consolidated / Combined Short year Estimates (filed separate from return) Extension Amended C Corporation Amended S Corporation
Return types not accepted	Amended Combined
Accepts returns with these conditions	Refund Zero balance Balance due
Direct deposit of refunds	Yes
Accepted forms of payment	Direct debit (EFW) Electronic funds transfer (EFT) Check by mail (only if waiver is granted)
Signature requirements	None
Supports PDF attachments	Yes
Tax year(s) supported for e-filing	Current tax year and two prior tax years
Special considerations	Connecticut prefers that you use electronic funds withdrawal to make any payments.