What Is The Maximum You Can Contribute To A Roth 401K? 
A Roth 401k is a designated Roth account . A designated Roth account is a feature in new or existing 401k , 403b or 457b plans that permit such plans to accept designated Roth contributions . The combined amount you can contribute to all designated Roth accounts in any one year for an individual under 50 years of age is $ 17,500 for 2014 . If you are age 50 or older by the end of 2014 , you can add an additional $ 5,500 in catch-up contributions . You can also contribute to both a Roth 401k and a Roth IRA in the same year which can increase the total contribution amount by $ 6,500 if you are 50 or older . 