Subject to the provisions of §§301.6316-3 to 301.6316-5, inclusive, that portion of the income tax which is attributable to amounts received by a citizen of the United States in nonconvertible foreign currency may be paid in such currency—

(a) For any taxable year beginning on or after January 1, 1955, and before January 1, 1964, if such amounts—

(1) Are disbursed from funds made available to a foundation or commission established in a foreign country pursuant to an agreement made under the authority of section 32(b) of the Surplus Property Act of 1944, as amended (50 U.S.C. App. 1641(b)(2)), or reestablished under the authority of the Mutual Educational and Cultural Exchange Act of 1961, as amended (22 U.S.C. 2451);

(2) Constitute either a grant made for authorized purposes of the agreement or compensation for personal services performed in the employ of the foundation or commission;

(3) Are at least 75 percent of the entire amount of the grant or compensation; and

(4) Are treated as income from sources without the United States under the provisions of sections 861 to 864, inclusive, and §§1.861-1 to 1.864, inclusive, of this chapter (Income Tax Regulations); and

(b) For any taxable year beginning on or after January 1, 1964, if such amounts—

(1) Are disbursed from funds made available either to a foundation or commission, established pursuant to an agreement made under the authority of section 32(b) of the Surplus Property Act of 1944, as amended, or to a foundation or commission established or continued pursuant to an agreement made under the authority of the Mutual Educational and Cultural Exchange Act of 1961, as amended; or are paid from grants made to such citizen, or to a foundation or an educational or other institution, under the authority of the Mutual Educational and Cultural Exchange Act of 1961, as amended, or section 104 (h), (j), (k), (o), or (p) of the Agricultural Trade Development and Assistance Act of 1954, as amended (7 U.S.C. 1704 (h), (j), (k), (o), (p));

(2) Constitute either a grant made for a purpose authorized under any such agreement or law, or compensation for personal services performed in the employ of any organization engaged in administering any program or activity pursuant to any such agreement or law;

(3) Are at least 70 percent of the entire amount of the grant or compensation; and

(4) Are treated as income from sources without the United States under the provisions of sections 861 to 864, inclusive, and §§1.861-1 to 1.864, inclusive, of this chapter (Income Tax Regulations).