Victor Roberts wrote: ...
Third, even if there was only one wage earner, he has
> conveniently over-calculated the additional tax by a factor
> of 2. He has used the total rate of 12.4% instead of the
> employee rate of 6.2%..
That part, at least, is _not_ a miscalculation. It's why they did what they did to hide the magnitude of the tax from the taxpayer, but it's a tax nonetheless.