W2 shows state income tax withheld for CT. Employer is not a CT company and there is no Employer state ID number on W2. Why won't turbotax let me leave it blank?

[timwood0]

Usually, state tax applies to income earned in that state, regardless of the employer's domicile.

I would fill it in, and apply the net state taxes paid in 2021 toward the (unfortunately lowered) SALT deduction, if it benefits you to take it.

[JulieS]

If the space for a state tax ID number is blank on your W-2 form, but state tax was withheld, you can use the EIN  in the state ID field. The EIN is in box b, which is usually near the top of the form. 

[SteamTrain]

@dave171 

Just make sure you check each and every W-2 copy they have on their PDF set of W-2 forms.  Usually, there is more than one W-2 provided in a paper/PDF W-2 set.  One copy for the IRS, and one or several for using with the state filings (In case you end up paper filing by mail)