This article clarifies that the plan will only suffer if someone has contributed more than the maximum "in their account in their plan". So since this was across two different accounts in two different plans under two different employers, neither plan will suffer I don't think.
https://www.irs.gov/retirement-plans/401k-plan-fix-it-guide-elective-deferrals-exceeded-code-402g-limits-for-the-calendar-year-and-excesses-were-not-distributed"for a plan to be qualified, it must provide that the amount of elective deferrals for each participant under all plans of the same employer not exceed the 402(g) limits"
For me however, I'm still not sure what happens now...I need to work with HR to get them to pay me out, sure, but seems like I also need a corrected W-2 for 2020, and apparently I'll get taxed twice on this money, AND I'll get taxed a 10% additional: once in 2020 and once in 2021!
Example from the above article:
"For 2018 (year of deferral), Ann must include $500 in gross income. For 2019 (year of distribution), Ann must include $510 in gross income. Employer X would report this amount on Form 1099-R. In addition, Ann must pay the additional 10% early distribution tax under IRC Section 72(t)."
Jeez...lesson learned. Do NOT get ambitious about your 401k deferrals and try to get the exact amount contributed, especially in a year when you change jobs. Better to be safe than sorry. This is a pain
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