Change in Entity sponsoring solo 401k

QUESTION: If we are an LLC now, and change in the future to an S Corp, does that present problems for the solo 401k? 

ANSWER: Not at all.  You would simply want to let your solo 401k provider know so that they can update the solo 401k plan documents.  In terms of determining how much money you could contribute to the Solo 401k plan (e.g., salary deferral, profit-sharing contributions), the formula would be different as it would be a function of your w-2 wages from the S-corporation.

More Information
Solo 401k FAQs