Start-up plan in 2020 expected to be a solo(k) plan covering only owner & possibly spouse (who did not work in 2020). Eligibility is age 21 & 3 months elapsed time, monthly entry dates. Owner actually hired a part-time employee in July 2020 who became eligible in November, and terminated in December. Testing determined no contributions were required for this NHCE employee. So the participant count on 1/1/20 was 1 (owner only) and count on 12/31/20 was 1 (owner only).
Assets were under $250k the entire year.
Does this plan need to file 5500-SF or can they use 5500-EZ and not file for 2020 due to assets under $250k?