The Bureau of the Fiscal Service provides quarterly exchange rates. If you have questions on tax forms, please contact the IRS or your tax professional. If you have questions about the rates on the Bureau of the Fiscal Service web pages, please use the contact information at:
For exchange rates from 1956 through 2008, please contact:
U.S. Department of the Treasury Librarylibraryreference@treasury.gov
202-622-0990