The taxpayer, who had tax debts on his death, made an "informal" disclaimer of his beneficial interest under the estate of his wife five days prior to her death (which was found to be invalid because the common law required that a disclaimer be made after the death of the legator) and, three years after her death, made a formal disclaimer. The formal disclaimer was found to operate as a surrender and release, rather than a disclaimer, because his conduct subsequent to her death was inconsistent with a disclaimer.