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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.
So, for a married couple with an income (adjusted as described above) less than $32,000, none of their Social Security benefits are taxable at the federal level. In the income range $32,000 to $44,000, between 50 to 85 percent of Social Security benefits may be taxable at the appropriate marginal tax rate. Above $44,000 in adjusted income, 85 percent of benefits may be taxable.