The Roth 401(k) came about at the beginning of this year. However, it cannot yet tout widespread popularity, as many companies have opted not to offer it. However, General Motors Corp has announced its plans to offer it and will be the first major employer to do so, and as a result, GM's decision may boost the popularity of the newest retirement savings product, The Wall Street Journal reports.

"When larger companies start adding features like a Roth, the smaller players feel they must follow in order to stay competitive," said Chris Bowman, vice president of retirement and investor services at Principal Financial Group, a large retirement savings plan administrator.

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