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 Did you enjoy this article? Join our FREE Newsletter! I agree to have my personal information transfered to MailChimp ( more information ) Join over 100,000 investors and business leaders worldwide. Get the latest actionable business and investing intelligence before the rest of the crowd.We hate spam. Your email address will not be sold or shared with anyone else.