topic What is box12 code D21 in Get your taxes done using TurboTax

What is box12 code D21

alfredom619 — Mon, 23 Feb 2026 12:58:51 GMT

on my w2 civilian worker for gov

Re: What is box12 code D21

Cynthiad66 — Thu, 09 Feb 2023 13:45:38 GMT

Box 12 D

Code D—Elective deferrals under a section 401(k) cash or deferred arrangement (plan). Also show deferrals under a SIMPLE retirement account that is part of a section 401(k) arrangement.

IRS Instructions for W-2 pages 18 and 19

Enter all information on the W-2 as it is and TurboTax will process according to the tax law.

Re: What is box12 code D21

SteamTrain — Thu, 09 Feb 2023 14:09:43 GMT

D21....the 21 just indicates that some of the $$ contributed was to pay for some 2021 TSP/401k contributions that were not done during 2021. The "21" isn't entered.