A brand new DB plan is started 2-1-2018, plan year ends 1/31. It excludes years of service prior to 2-1-2018 for vesting purposes. Vesting is a 3-year elapsed-time cliff. One participant is also a 20% owner and they are 71 years old now.
The owner becomes fully vested on 1/31/2021.
The first RMD is the accrual on 12/31/2018, but it is not vested, so it gets added to the next year's RMD. The second RMD is the accrual on 12/31/2019 plus the prior unpaid (nonvested) RMD, but it is still not vested, so it gets added to the next years' RMD. The third RMD is the accrual on 12/31/2020 plus the prior amounts, but it is still not vested, so it gets added to the next year's RMD.
By 12/31/2021, the participant must take the distribution of their RMDs. They terminate in 2021 and elect a lump sum payment. The RMD for a full lump payment can be calculated using the "Account Balance" method (like a DC plan).
Can all of these RMD's be determined using the account balance method, or must the 3 prior year's RMDs be based on the DB annuity calculation method?