The Roth 401k is particularly attractive to higher-earnings individuals, or those that would mostly likely be phased out of IRA contributions. Unlike the $5,000 max in the IRA, an employee could defer the full $15,500 for 2007, or $20,500 if they are over age 50. The Roth 401k works much like the Roth IRA, in that contributions are made with after-tax dollars and withdrawals are tax-free. Unfortunately, not all employers offer this new plan. The roth 401k, quite frankly, is a dream come true in my opinion. Ok so thats a little exaggeration but it truely is the best of both worlds - 401k and Roth IRA.