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http://www.ssa.gov/OACT/solvency/provisions/payrolltax.html
Provisions Affecting Payroll Tax Rates
Present law Social Security and Medicare tax rates
These provisions modify the current-law OASDI payroll tax rate of 12.4 percent (6.2 percent each for employees and employers). We provide a summary list of all options in this category. For each provision listed below, we provide an estimate of the financial effect on the OASDI program over the long-range period (the next 75 years) and for the 75th year. In addition, we provide graphs and detailed single year tables. We base all estimates on the intermediate assumptions described in the 2012 Trustees Report.
Choose the type of estimates (summary or detailed) from the list of provisions.
We group these provisions as follows:
E1: Increase payroll tax rate, with no changes in the taxable maximum.
E2: Tax all earnings above the current-law taxable maximum.
E3: Tax a portion of earnings above the current-law taxable maximum.