what percentage of gross income is withheld as an employee's contribution to social security
Payroll tax Federal social insurance taxes are imposed on employers[20] and employees,[21] ordinarily consisting of a tax of 12.4% of wages up to an annual wage maximum ($118,500 in wages, for a maximum contribution of $14,694 in 2016) for Social Security and a tax of 2.9% (half imposed on employer and half withheld from the employee's pay) of all wages for Medicare.[22] The Social Security tax is divided into 6.2% that is visible to employees (the "employee contribution") and 6.2% that is visible only to employers (the "employers contribution"). For the years 2011 and 2012, the employee's contribution had been temporarily reduced to 4.2%, while the employer's portion remained at 6.2%,[23] but Congress allowed the rate to return to 6.2% for the individual in 2013.[24] To the extent an employee's portion of the 6.2% tax exceeded the maximum by reason of multiple employers, the employee is entitled to a refundable tax credit upon filing an income tax return for the year.[25]
History of taxation in the United States Congress enacted an income tax in October 1913 as part of the Revenue Act of 1913, levying a 1% tax on net personal incomes above $3,000, with a 6% surtax on incomes above $500,000. By 1918, the top rate of the income tax was increased to 77% (on income over $1,000,000, equivalent of 15,300,000 in 2012 dollars[20]) to finance World War I. The average rate for the rich however, was only 15%.[21] The top marginal tax rate was reduced to 58% in 1922, to 25% in 1925 and finally to 24% in 1929. In 1932 the top marginal tax rate was increased to 63% during the Great Depression and steadily increased, reaching 94% (on all income over $200,000, equivalent of 2,500,000 in 2012 dollars[22])in 1945. During World War II, Congress introduced payroll withholding and quarterly tax payments.[23]