Actually, they didn’t “change the tax rate tables,” just changed the withholding amount for everybody so they got more money in their checks. If they had changed the tables to reflect the withholding, the right amount of tax would have been taken out.
Check out the second sentence that I wrote. The tax rate change came when they allowed the Bush tax cuts to die without renewing them. That is this year. And the tax rate change is an increase. So everyone will actually owe more taxes. Last year, 2009, was the withholding tables funny business.
I apologize if I was not clear enough for you.