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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 determine what portion of your benefits from Social Security is taxable, you must calculate your provisional income and compare it to federal income tax limits. Provisional Income Provisional income is the total of your adjusted gross income, tax-exempt interest and half of your Social Security benefits for the year. If your provisional income is above a certain limit, you must pay income tax on a portion of your benefits. The higher your income, the larger the portion of taxable benefits will be.