TAX INCIDENCE. One way to reduce the tax burden on middle-and-lower-income U. S. taxpayers is to cut Social Security taxes, notes Robert B. Reich. What is also noteworthy is that a court intellectual for the Democratic Party recognizes that the "employer's share" of Social Security "contributions" really counts against the marginal-value product of the employee, and (drumroll) there is no such thing as a Social Security trust fund (/drumroll).