Situation: $4,000 payroll from April 1 2019, not deposited until January 10, 2020. Plan year is calendar year, so it requires 2019 and 2020 Form 5330 fillings.
Calculated interest:
2019 $310
2020 $34
4975(a) First Tier Excise Tax calculation (entered on Form 5330 line 3a):
2019: $310x15% = $46.50
2020: ($310+$34) x 15% = $51.60.
Calculation from Exhibit 4.72.11-6 on https://www.irs.gov/irm/part4/irm_04-072-011#idm139654188128704
4975(b) Second Tier Excise Tax calculation (entered on Form 5330 line 3b?
2019 None
2020:
A: 100% of the 2019 Amount of prohibited transaction reported on 2019 filling $310
B: 100% of the 2019 amount of total prohibited transaction $4,000 + applicable Interest $310: for the total of $4,310?
Which would make total excise tax due with 2020 filling of either ($310 + $51.60) = $361.60 or ($4,310+$51.60) = $4,361.60?
Thanks for your help!