Title 31 › Subtitle SUBTITLE IV— - MONEY › Chapter CHAPTER 51— - COINS AND CURRENCY › Subchapter SUBCHAPTER V— - MISCELLANEOUS › § 5151
When U.S. customs must change foreign money into U.S. dollars to figure import duties, it follows set rules about which exchange values to use. Buying rate — the New York market rate at noon for cable transfers in the foreign currency being converted. Standard coin — the country’s regular coin whose pure metal content is used to set its U.S. value. The Treasury must estimate coin metal values and publish them on January 1, April 1, July 1, and October 1 each year. Usually customs uses the published quarter value for goods exported that quarter. If no value was published for that quarter, or the published value differs by at least 5 percent from the buying rate at noon on the export day, conversion must use either the buying rate at noon that day or a rate equal to the first buying rate certified for that quarter by the Federal Reserve Bank of New York, but only if that first certified rate is within 5 percent of the noon buying rate. The New York Fed decides and certifies the buying rate. It may base the rate on recent transactions or quotes, or if none exist, on actual bills-of-exchange transactions or last outside‑U.S. exchange transactions.
Full Legal Text
Money and Finance — Source: USLM XML via OLRC
Legislative History
Reference
Citation
31 U.S.C. § 5151
Title 31 — Money and Finance
Last Updated
Apr 6, 2026
Release point: 119-73