Final plan year
Plan year in which all plan assets are distributed or transferred — requires a final Form 5500-EZ even below $250,000.
Definition
A final plan year is the year in which all assets of the Solo 401(k) plan are fully distributed (paid to participants) or transferred (rolled to an IRA or another plan). A final-year Form 5500-EZ is required even when the plan held less than $250,000, with the 'final return' box checked and ending assets reported as $0.