My W-2 box 12DD (cost of employee sponsered health coverage) filled in am I supposed fill that in when filling my taxes I've never seen this before not certin what to do

[LauraShine]

Yes.  If you import your W2, it will be filled in for you. (How do I import my W2 )  or if you cannot import your w2 electronically, you will manually enter it by selecting Skip Import.

Box 12 with Code DD is simply the total cost of the employee’s health insurance coverage paid by both the employee and the employer, and it is not taxable. Thus, it is listed in Box 12 , as would other benefits such as Roth contributions, some group life insurance or non-taxable six pay, just to name a few. 

If you dont recall having health coverage through your employer for 2017, please contact your employer for a corrected W2.