Wait a minute, here! Is the spouse still alive? If not, are the children? If not, did they have any children who remain alive? You need to have no answers to all of the preceding questions before you even consider whether the benefit is payable to the participant's estate. The points raised by ESOP Guy are all problems for the decedent's estate and the surviving heirs. If it is payable to an estate, have the executor/administrator certify the EIN for the estate before you pay anything. Also ask to see letters testamentary (if the decedent died with a will) or letters of administration if the decedent did not have a will in force at the time of death. For the last sentence, short forms are ok for the plan to accept in lieu of full letters testamentary/administration. If the estate is too small, there is an affidavit that is filed with the probate court -- have the personal representative provide you with a certified copy of the de minimis estate order. When it is time to issue the 1099-R, you would issue it to the estate's EIN (or if the estate is too small to the persons's SSN name in the order in lieu of administration). Who gets it, in what proportions and all other questions are not issues for the plan to solve -- they are the problems to be faced by the executor/administrator. I know that determining who gets per stirpes can be an issue since the plan would not know who is eligible to inherit. In that case, have the executor/administrator provide that to you. You might also want to get a release that you have a right to rely upon what they are telling you and that you have no liability for making payments pursuant to their direction.