法律有史以来第一次通过的雇主存roth退休金, 帮我省了一万刀的税

Background:

LLC pass through 1099 income file Schedule C

Has solo 401k plan

Has LTRs

发现一个新的省税的方法， 12月份2023 官方才明确下来具体操作方法。

Solo401k Overall limit on contributions $69,000 ($76,500 including catch-up contributions) for 2023.

现在法律有史以来第一次通过allow Roth solo 401k employer profit sharing contributions (aka nonelective) under SECURE 2.0 

https://www.mysolo401k.net/three-different-types-of-designated-roth-401k-contribution-types-only-two-apply-to-self-directed-solo-401k-plans/

举例，2023年 Schedule C 净收入10万，今年没有存其他退休金，Roth solo 401k employer profit sharing contribution $69，000; I will issue 1099 R with $ 69,000 income (this is not subject to FICA for my schedule C income) for 2024; 这样省了一万左右的FICA for 2023; 2024 年 I am eligible for REPs; will do cost seg to generate rental loss and planning to off set 200k active income for 2024. 

I know if for Employer pre tax profit sharing; I can only contribute $100,000* 20% as a sole propritor;  I understand in this case, the Roth solo 401k employer profit sharing contributions can be up to $ 69000, I am still waiting for fianal confirmation.