Code D in box 12 reports your contribution to a 401(k) plan. You do not enter the 18, that just means that it is for the year 2018. Just enter the code D and the amount.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
"18" means that the elective deferral was for 2018. The "18" is redundant because code D by itself in box 12 of a 2018 Form W-2 means an elective deferral for 2018.
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