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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.
Your tax bracket is determined by your filing status and your adjusted gross income after considering deductions and credits. After identifying your tax bracket on the current year's tax table, multiply the rate by the amount of taxable Social Security benefits to calculate the tax you'll pay on the benefits.