A correction in today's Times says "An article on Wednesday about additional economic hurdles facing investors in the new year misstated the payroll tax increase approved by Congress on Tuesday. The payroll tax will increase to 6.2 percent, from 4.2 percent. It will not rise by 6.2 percent."
This fixes one aspect of the problem covered here yesterday, but it repeats the more significant error of underestimating the total payroll tax.