* A death certificate should suffice in all circumstances, but it is often not required in small towns where bank employees have actual notice of the death; e.g. they went to visitation at the funeral home.
* You are not in a position to close the decedent's IRA and open pay-out accounts in the name of the POD beneficiaries. They may have predeceased the decedent, they may choose to disclaim their interests, you probably do not have all of the necessary information, etc. etc.
* Few automatically attempt to contact beneficiaries. First, there is no logical place to stop looking once you start. Second, there is no way to be certain the beneficiary already knows of the death and your reaching out will be the most embarrassing phone call or letter of your life.
* Add your inability to establish contract terms for a beneficiary's pay-out account to your reasons for not setting one up before you hear from the beneficiary.
* A person who inherits an IRA has absolutely no reason whatsoever to sign an IRA agreement. They are not opening an IRA. They inherited the decedent's IRA. If the file is too light, put a copy of the decedent's IRA agreement and beneficiary designation in the folder. That should satisfy anyone's desire for a paper trail. Should the beneficiary sign a beneficiary designation of his or her own? Yes.
There are differing opinions to some of the above. Some bankers have attended one too many seminars and want to pretend that they are in control. They forget their employer is the "custodian" and it holds the assets, nothing more.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.