Many companies offer a 401K to help you save your pre-tax dollars for retirement. But is this enough money for you to live comfortably after you retire or should you also be putting funds aside in a Roth IRA? The answer, says CNBC personal finance expert Carmen Wong Ulrich, depends on how much you will be taxed when you go to withdraw from these accounts. Watch as she explains the differences between the 401K and the Roth IRA and how to know which is the right one for you.

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