26 CFR § 20.2056(d)-1
Marital deduction; special rules for marital deduction if surviving spouse is not a United States citizen
June 25, 2020
Rules pertaining to the application of section 2056(d), including certain transition rules, are contained in §§20.2056A-1 through 20.2056A-13.
[T.D. 8612, 60 FR 43538, Aug. 22, 1995]