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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.
The Old-Age, Survivors and Disability Insurance program, or OASDI, tax is calculated by taking a set percentage of your income from each paycheck. More commonly called the Social Security tax, this percentage is determined by law each year and applies to employees and employers. For 2015, both employees and employers must contribute 6.2% of employee compensation, for a total of 12.4%. Those who are self-employed are liable for the full 12.4%.