I don't work in HR so I'm not familiar with how companies deal with this, but I would be surprised if it doesn't hit your paycheck somehow -- directly deducting it from your current pay may be less likely than factoring the added cost into funds available for annual raises.
> Wasn't the 2% tax cut on the side the employer pays? That means if you paycheck goes down because of it, your employer is pretty much a jerk.
In the short run, this would make a difference, but not in the long run - the incidence of payroll taxes has been shown to fall almost entirely (~98%) on the employees.
(For those unaware: the incidence of a tax[1] is a way of describing who really bears the burden, which is completely unrelated to who nominally pays a tax out-of-pocket).