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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.
The Social Security tax rate is assessed on all types of income earned by an employee including salaries, wages, and bonuses. However, there is an income limit to which the tax rate is applied. For 2017, the Social Security tax is taken from income up to an annual limit of $127,200. Any amount earned above $127,200 is Social Security tax-free.