AlbanyConsultant, if there is much money involved, I would be cautious. Rev. Rul. 2019-19 does not deal with the situation of the payee participant's death. Arguably it should stand for the proposition that for federal income tax purposes the amount will be on you deceased participant's final return. However, it is just a revenue ruling, i.e. the semi-authoritative opinion of the IRS, and the example it uses is a small amount forced cashout, so it was really trying to provide a practical accommodation to plan administrators more than being a deep statement or analysis of the rules of constructive receipt. Bottom line, if there is a significant amount involved, I think there is plenty of room for the son and mom to fight in court.