
ANSWER: No a Form 1041, U.S. Income Tax Return for Estates and Trusts does not apply to a solo 401k even though it falls under the trust umbrella. Instead, form 5500-EZ requires filing for the solo 401k if the total value of the account is over $250,000.
Solo 401k Form 5500-EZ Filing Requirements
Solo 401k Deadlines
ADDITIONAL INFORMATION