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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 amount of a personâs Social Security income that is taxable under the U.S. federal tax code depends on two factors: a taxpayerâs filing status and the size of the taxpayerâs âcombined incomeâ (adjusted gross income + nontaxable interest + half of Social Security benefits).