If I got divorced in June and forgot to change my W4 to single with my employer and my W2 for 2017 says married, how much trouble am I in?

[IreneS · Accepted solution]

None.  This just refers to the withholding taken from your paycheck. You may find yourself owing since you still had withholding as if you were filing married.

[xmasbaby0]

You are not in any trouble!  The W-4 for your employer just indicates how much tax you want the employer to withhold from your paycheck.  It does not go to the IRS or dictate how you have to file.  Just enter your W-2 exactly as it appears in your tax return.  Going forward you can change the amount being withheld from your paycheck if you want to.  New W-4 forms will be coming out pretty soon anyway, because of all the tax law changes.