6.20 percent
If you are paid every week-about four times a month-you will see even smaller amounts deducted. The business remits these deductions to the IRS once a quarter (every three months). Figure on taxes taking 30% of your paycheck-Social Security, Medicare, Federal Income Tax, Arizona State Income Tax. Taxes vary with your pay; the less you are paid, the lower the taxes. The higher your pay, the higher the taxes For 2011 only, the social security tax coming out of your paycheck is 4.2% instead of 6.2%, meaning that this year you will take home more money than you would in a normal year. Your employer matches these amounts too -- they pay another 6.2% for social security, and another 1.45% for Medicare. Part of your 7.65% FICA withholding is earmarked for Social Security (6.2%); part is used to fund Medicare Part A (1.45%) insurance. … The money is recorded as a credit to the Social Security Trust fund and then it is spent for whatever the Treasury needs it for at the moment. If you’re self-employed, you pay the combined employee and employer amount, which is a 12.4 percent Social Security tax on up to $118,500 of your net earnings and a 2.9 percent Medicare tax on your entire net earnings. In 2015, however, if your wages are $78,000, and you have $40,700 in net earnings from a business, you don’t pay dual Social Security taxes on earnings more than $118,500. Your employer will withhold 7.65 percent in Social Security and Medicare taxes on your $78,000 in earnings. You must pay 15.3 percent in Social Security and Medicare taxes on your first $40,500 in self-employment earnings and 2.9 percent in Medicare tax on the remaining $200 in Social Security tax and Medicare tax are two federal taxes deducted from your paycheck. The Social Security tax was 6.2 percent of your total pay until you reach an annual income threshold.  Calculate Social Security tax. The tax rate for Social Security is 12.40 percent of gross earnings, of which the employee pays half, or 6.20 percent. Multiply gross earnings by 6.20 percent to find the Social Security tax to be deducted from the employee's pay. Find the amount of Medicare tax. Social Security taxes are levied on gross earnings before any deductions. Review the employee's year-to-date earnings. There is a cap on income subject to the Social Security tax (but not for the Medicare tax). As of 2009 the cap was $106,800. Social Security Tax Basics. The Social Security tax is based on a percentage of your salary. At the time of publication, you pay 4.2 percent of your income from employment in Social Security taxes. You pay this percentage on your first $110,100 in income, for a maximum of $4,624.20 per year. The IRS is responsible for collecting Social Security taxes.  Paying Social Security and Medicare taxes Currently, you and your employer each pay a 6.2 percent Social Security tax on up to $118,500 of your earnings and a 1.45 percent Medicare tax on all earnings. In 2015, however, if your wages are $78,000, and you have $40,700 in net earnings from a business, you don’t pay dual Social Security taxes on earnings more than $118,500. Your employer will withhold 7.65 percent in Social Security and Medicare taxes on your $78,000 in earnings. You must pay 15.3 percent in Social Security and Medicare taxes on your first $40,500 in self-employment earnings and 2.9 percent in Medicare tax on the remaining $200 in net The specific amount withheld should be shown on your payment stub or direct deposit receipt, and is labeled FICA. A total of 7.65% of your pre-tax income (6.2% for Social Security and 1.45% for Medicare Hospital benefits) is withheld from each paycheck until you reach the current earnings cap of $106,800. Part of your 7.65% FICA withholding is earmarked for Social Security (6.2%); part is used to fund Medicare Part A (1.45%) insurance. … The money is recorded as a credit to the Social Security Trust fund and then it is spent for whatever the Treasury needs it for at the moment. The Social Security tax is normally 6.2 percent of income for the employee and the same for the employer, though the employee rate was temporarily lowered to 4.2 percent from 2011 to 2012 as part of an economic stimulus package. 
https://answers.yahoo.com/question/index?qid=20130601210858AAWsD6V http://www.answers.com/Q/How_much_Social_Security_do_they_deduct_from_your_paycheck http://www.ssa.gov/pubs/EN-05-10022.pdf http://www.ehow.com/info_7781475_percent-taxes-deducted-paycheck.html http://www.ehow.com/how_5073333_calculate-social-security-deductions.html http://finance.zacks.com/refund-social-security-taxes-withheld-4223.html http://www.ssa.gov/pubs/EN-05-10022.pdf http://www.answers.com/Q/How_much_Social_Security_do_they_deduct_from_your_paycheck https://turbotax.intuit.com/tax-tools/tax-tips/General-Tax-Tips/Why-Is-My-Check-So-Small-After-Taxes-/INF19169.html
how much social security is deducted from my paycheck