The income derived from the certificates is subject to all taxes imposed under the Internal Revenue Code of 1954. The certificates are subject to estate, inheritance, gift or other excise taxes, whether Federal or State, but are exempt from all taxation now or hereafter imposed on the principal or interest thereof by any State or any of the possessions of the United States, or by any local taxing authority.
Code of Federal Regulations
[40 FR 29846, July 16, 1975]