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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 whether your Social Security benefits are taxable, you need to add half of your Social Security income that is reported in Box 5 of your Form SSA-1099 to your income, which includes taxable pensions, wages, interest, dividends, other taxable income and tax-exempt interest income.