Those who pay into Social Security
First, on Jan. 1 the tax wasn't hiked; it was restored to its 2010 level, after a two-year "holiday" that reduced the withholding to 4.2% of employees wages (up to wages of $101,800 in 2011 and $110,100 last year) from the 6.2% level in effect since 1990.
The idea was to deliver stimulus dollars to middle- and working-class families. But the holiday was always a wretched idea, in part because of what everyone knew would happen when the old rate reappeared --people treated it as a pay cut.
The worse flaw was that it was a lousy way to deliver targeted working-class relief. The change replaced the Obama administration's previous Making Work Pay tax credit, which delivered up to $800 to families earning $12,900 to $150,000.
The payroll tax break, by contrast, went only to those who pay into Social Security. So it left out 5.7 million state and local workers (mostly teachers). On the plus side, it fattened the paychecks even of the nation's top earners by a much-needed $2,100 or so.