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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.
Social Security figures the individualâs adjusted income to decide if the person is required to pay a higher rate for the Medicare Part B premium. However, the calculations are based on the most recent tax information available. In 2010 Social Security is typically looking at the tax return filed in 2009; the 2009 filing is for tax year 2008. Much can happen in a personâs life in the course of a year. If an individualâs income has gone down due to certain circumstances, the person may contact the Social Security Administration to discuss the amount of his or her Part B premium.