16.3.2.1 Designated Roth Accounts Within 401(k), 403(b), and 457 Plans
Roth 401(k), Roth 403(b), and Roth 457 plans are employer-sponsored retirement plans that have similarities to both Roth IRAs and traditional 401(k), 403(b), and 457 plans. As with a Roth IRA, participants make after-tax dollar contributions to the account. As long as they are over 59 1/2 years old and have had the account for five years or more, they can make all withdrawals tax-free. Income earned in the account will not be taxed, even at withdrawal.
Roth 401(k), 403(b), and 457 plans resemble their traditional counterparts in that the employer can make matching contributions, but the empl