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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 determine your amount of the social security and medicare taxes that you will have withheld from your gross wages multiply the amount that is supposed to be subject this tax by 7.65% and that should give you the total SS and medicare tax that may have been withheld from your gross earnings for that pay period.