Suppose I have a day job with my regular company 401k plan, and I also have a single-person LLC that does one business and an S-Corp with no employees that does another unrelated business. Can I have two separate Solo 401k plans?
If that is the case, then I can have up to $63,500 total contribution ($26,000 pre-tax/Roth + company match + after-tax contribution which can be mega backdoored), plus two potential $57,000 after-tax contributions from my LLC and S-Corp. Does IRS allows for multiple Solo 401k plans?
ANSWERS:
In short: no you cannot because (i) the overall limit will be aggregated across all plans that are owned by you; and (ii) it is an audit red flag to have multiple plans as you describe above.