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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.
You can use IRS publication 915 to estimate the amount of taxable Social Security income you will have. Qualified plan participants who also contributed to a deductible IRA must use the worksheets found in IRS Publication Form 590 instead.