Why Isn't All Earned Income Subject to Social Security's Payroll Tax? September 6, 2018 admin Trading Ideas Comments Off on Why Isn't All Earned Income Subject to Social Security's Payroll Tax? In 2018, earned income above $128,400 is exempt. …read more Source:: Yahoo Finance Get our FREE Newsletter! Discover Stocks with +1,000% Upside Potential! Thank you for subscribing. Something went wrong. Join over 100,000 investors and business leaders worldwide. Discover the Next Super Stock before the rest of the crowd. Your privacy is our priority. Your email address will never be sold or shared with anyone else.