The contribution rules for a Roth 401(k) are exactly the same as for a traditional 401(k). You can contribute a maximum of $17,000 in 2012 if you are younger than 50 years old. If you are 50 or older, you can make an additional "catch-up" contribution of as much as $5,500, for a total of $22,500. Those contribution limits are scheduled to adjust annually in line with inflation.
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