Question about W-4s.

[IHateMyJob2004]

I could'nt find it online so I figure I would just ask. When you fill out a W-4. what exactly does that influence? Obviously, it determines your federal tax withholding. Does the W-4 also determine what is withheld for Medicare and Social Security?

 

[Ns1]

No, just the withholding

You don't escape the MC/SS.