louie71:
The instructions for the W-2 (which are instructions to your employer on how to fill out the W-2) state "Section 402A requires separate reporting of the yearly designated Roth contributions" see page 10 of the W-2/W-3 instructions.
Subsequently on page 23, you will see "Code AA—Designated Roth contributions under a section 401(k) plan. Use this code to report designated Roth contributions under a section 401(k) plan. Do not use this code to report elective deferrals under code D. See Designated Roth contributions." This is what dmertz is referring to.
So, the W-2 instructions state that your employer should have reported the Roth 401(k) contribution on your W-2.
"Is there any harm with the IRS if they are not listed?" - I can't say if you will come to harm if your employer does not follow the IRS instructions for the W-2, but I would think that you would like to avoid the situation if you can. After all, if the IRS discovers something awry, they may write you a letter rather than your employer, and I assume that you would prefer to stay out of it.
You might ask your employer why your contributions to a Roth IRA were not listed with a code AA in box 12.
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