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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.
To calculate income taxes, most taxpayers must calculate their adjusted gross income, which includes all income from wages, investments and other sources. Social Security recipients, on the other hand, must calculate their combined income, which includes adjusted gross income in addition to nontaxable interest and Social Security benefits. This combined income figure can be used to determine whether or not you will have to pay taxes on your benefits, and roughly how much of your benefits are taxable.