I agree. If it's money taken by the government, it's a tax. It doesn't matter to size of your paycheck, or your budget, whether the money is taken for SS or Medicare or the EPA.
Someone here, I'm pretty sure it was Beep (but naturally I can't find it), made the argument that FICA was different when we were discussing the bogus story that "half of Americans don't pay tax" - e.g. http://www.washingto...010_04/023260.php
FWIW.
Cheers,
Scott.