If the plan covered a nonowner employee or former employee during some part of the to-be-reported-on year, was the plan ERISA-governed (for at least that part of the year)?
ERISA § 3(1)-(3), 29 U.S.C. § 1002(1)-(3); 29 C.F.R. § 2510.3-3 https://www.ecfr.gov/current/title-29/section-2510.3-3
If so, wouldn’t the plan’s administrator continue reporting on Form 5500-SF, at least until reporting the first year that has no coverage of any nonowner (at any time during the to-be-reported-on year)?