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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.
2. Build a calculated field to determine the amount of Social Security payroll taxes for each employee in your organization. For the employee side of the Social Security tax, you need to multiply the first $106,800 in salary by 4.2 percent. For the employer side of the tax, you need to multiply the first $106,800 in pay by 6.2 percent. 3. Calculate the amount of Medicare payroll taxes by multiplying the salary for each employee by 1.45 percent. Create another calculated field to represent the employer's side of the same tax. The employer side of the Medicare tax is equal to 1.45 percent of the worker's salary.