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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 taxable portion of social security benefits depends on the benefit amount, the. amount of other income, and the filing status. To determine if social security benefits. are subject to income tax and, if so, the amount subject to tax, the taxpayer must first. determine the taxpayerâs adjusted gross income. Generally, the lower a personâs. adjusted gross income, the lower the portion of social security benefits, if any, that will. be taxed.