"If you're running behind on retirement savings, you'll probably want to contribute the extra amount, even though there's not a current tax advantage.... A person who is currently age 50 and maxes out on both catch-up and super catch-up contributions could therefore end up with something in the neighborhood of $200,000 (assuming a 5% annual return) in the Roth 401(k) by age 65. And because contribution limits are adjusted for inflation each year, the total would likely be higher than that."  MORE >>