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Determining Taxable Amount. If your base income exceeds the limit for your filing group, you'll have to pay taxes on some of your Social Security benefits. If you're a single filer and your base income is between $25,000 and $34,000, you'll have to pay tax on up to 50 percent of your Social Security benefits.
To calculate FICA withholding, Acme should proceed as follows: 1  Calculate the Social Security taxable income. 2  Acme must first calculate the amount of John's pay subject to Social Security tax. Since there is no limit on Medicare withholding, and John's pay is not subject to any pretax deductions, the amount of his pay subject to Medicare tax is also $800. 2  Calculate the Social Security tax. 3  Acme multiplies the 2015 employee Social Security tax rate of 6.2% by the taxable income amount of $800.