@NCperson wrote:
the federal withholding is not 'calculated' - you tell the SSA what you want withheld.
@NCperson You tell the SSA what percentage you want withheld, not a dollar amount. taxesohmy2017 is asking what amount that percentage is applied to. The amount of withholding is calculated by multiplying the benefit amount by the specified percentage. The question was whether the benefit amount that's used for that calculation is the amount before or after Medicare premiums are deducted.
