Question: how is social security tax calculated 2018?
Answer: If you earn less than $128,400 in 2018, simply multiply your earnings by 0.062 to find your Social Security tax. For example, if your salary is $50,000, your 2018 Social Security tax will be $3,100. If you earn $128,400 or more, your Social Security tax is $7,960.80, no matter how much you earn.