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Yes, you can invest in both an IRA and a 401k (or a Roth 401k and a Roth IRA) at the same time, or any combination of those accounts.
The maximum contributions for either the Roth 401k or the traditional 401k are the same -- $16,500 in 2010. If you contribute to both a Roth 401k and traditional 401k, the sum of your contributions can't exceed that limit.If an employer offers a Roth 401k, most likely it would provide the same matching contributions as for a traditional 401k.There are really two main reasons to consider investing your current and future contributions in a Roth 401k.f you contribute to the traditional 401k: Since you aren't paying income taxes on the $10,000, you can invest the full amount. At 5 percent annual investment returns, your $10,000 will grow to $16,289 (if you're mathematically inclined, that's $10,000 times 1.05**10).