This document contains proposed amendments to the Federal estate tax regulations applicable to estates of decedents passing property to or for the benefit of a noncitizen spouse in a domestic trust for which the executor of the decedent's estate has made an election to be a qualified domestic trust and the trust satisfies all of the requirements for such treatment under applicable Federal tax law and regulations. The proposed regulations would modify those regulations to update outdated references information and procedures. The proposed regulations primarily would affect the estates of decedents passing property to or for the benefit of a noncitizen spouse in such a trust pursuant to applicable Federal tax law.