Its about 10% for social security and about 3% of medicare. Its not all in your pay stab bro. Your employer is paying over 6% social security for each employee and around 1.4 for medicare. Now the employer is not just paying that money out of the goodness of his heart for you, he's adjusting your salary to compensate for that 6% that he has to pay to employ you. But make no mistake, the 10% you and your employer are paying is all coming from your salary or would be salary. So if a person is making $100,000 a year, his pay stub might only show $4000 in social security and $1400 in medicare but the real number is about $10,000 social security and $2800 medicare.
To make it easier, the employer is paying 6% social security on your behalf and 1.4% medicare on your behalf. Those % numbers are not seen on your pay stub because they are numbers your employer used to base your salary off of and they're paying. If an employer didn't have to pay into social security and medicare on your behalf, your salary SHOULD be approx. 7.4% higher than it is. However the government knows that a lot of employers wouldn't pay higher salaries so they go after the money directly. Its just an accounting scam the government has in place. And employers like to bitch about because they want employees to think they're actually paying it and not you. Employers and the government are both in on the scam. And if and employer isn't taking it to account that he has to pay about 6% social security and 1.4 medicare for each employee and adjusting salaries accordingly, that guy shouldn't be allowed to have a business...