Connecticut W2 E-File Requirements & EFW2 Text Format | CT TSC Upload

Connecticut W2 Electronic Filing Common Questions and Answers

Does Connecticut mandate filing W-2s electronically?

As a Connecticut employer you are only required to file electronically when you have 25 or more W2 forms. You will need to check with the state annually, since this threshold is subject to change.

What is the name of the publication that defines Connecticut W2 E-Filing format and details?

Refer to "IP (13) Form W-2 Electronic Filing Requirements".

What software can I use to generate Connecticut W2 E-File submissions?

You can use our W2 Mate software to create W2 E-File submissions that comply with Connecticut requirements. To learn more about W2 Mate and download a demo you can visit


Can I mail my W2 E-File submission on a CD or other formats of magnetic media to Connecticut?

Connecticut no longer accepts magnetic media submissions, CD or other formats.

Does Connecticut Follow the EFW2 format defined by the SSA?

Yes, Connecticut follows the "Specifications for Filing Forms W-2 (EFW2)" as defined by the SSA, but the state also has its own special requirements.

How can I submit the Connecticut DRS-EFW2 (W2 E-File) Withholding file attachment to Connecticut?

To file your W-2 information and Form CT-W3 using the Connecticut DRS TSC (Taxpayer Service Center) goes to www.ct.gov/TSC , log into your account, and choose Standardized File Layout

Do you need to include the RV (State Total) record as part of the Connecticut W2 E-File Submission?

The RV record is not utilized by Department of Revenue and should be excluded from the submission.

Do you need to include the RS (State Wage) records as part of the Connecticut W2 E-File Submission?

Yes, this record is mandatory and has to be included.

Does Connecticut have a special file naming convention for W2 E-File submissions?

The file must end in .txt. The state does not have any special naming requirements; however it's a good idea to have the company name included in the file name.

Is the Connecticut W2 Electronic Filing submission attachment an ASCII text file?

Yes, the submission is a text file that follows the specifications of both the SSA EFW2 format and the Connecticut requirements defined by "IP (13) Form W-2 Electronic Filing Requirements".

Does Connecticut have any requirements for money fields?

Money amounts must be:

Does Connecticut have any requirements for Social Security Number (SSN)?

Use the number shown on the original/replacement SSN card.

How do I know if my submission was successful?

W-2 Forms are successfully transmitted when the TSC issues a confirmation number for Form CT W3.

How do I contact Connecticut with questions about my W2 E-File submission?

For telephone assistance, call DRS at 860-297-5962

The electronic filing engine available inside our W2 Mate® software gives Connecticut employers and tax professionals the ability to e-File W2s with both the state of Connecticut and the Social Security Administration’s (SSA). To learn more about W2 Mate visit https://www.realtaxtools.com/W2-Mate.html , email sales@realtaxtools.com or call 1-800-507-1992. 

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