12 U.S.C. § 541 : US Code - Section 541: Tax on circulating notes generally

Search 12 U.S.C. § 541 : US Code - Section 541: Tax on circulating notes generally

In lieu of all existing taxes, every association shall pay to the
Treasurer of the United States, in the months of January and July,
a duty of one-half of 1 per centum each half year upon the average
amount of its notes in circulation.