26 U.S.C. § 6316
Payment by foreign currency
The Secretary is authorized in his discretion to allow payment of taxes in the currency of a foreign country under such circumstances and subject to such conditions as the Secretary may by regulations prescribe.
( Aug. 16, 1954, ch. 736 , 68A Stat. 778 ; Pub. L. 94–455, title XIX, § 1906(b)(13)(A) , Oct. 4, 1976 , 90 Stat. 1834 .)