You can get help with unresolved tax issues, order free publications and forms, ask tax questions, and get information from the IRS and the Canada Revenue Agency in several ways.taxmap/pubs/p597-007.htm#en_us_publink1000126086
You can get the text of the U.S.—Canada income tax treaty from:
Superintendent of Documents
U.S. Government Printing Office
P.O. Box 371954
Pittsburgh, PA 15250-7954
The treaty can also be found on the Internet at www.irs.gov
During the filing season, the IRS conducts a taxpayer assistance program in Canada. To find out if IRS personnel will be in your area, you should contact the consular office at the nearest U.S. Embassy or consulate.
Mail. For answers to technical or account questions, you can write to:
Internal Revenue Service
P.O. Box 920
Bensalem, PA 19020-8518
Phone. You can call the IRS for help at (215) 516-2000.
You can get information on Canadian taxation from the Canada Revenue Agency. The International Tax Services Office can be contacted on 1-800-267-5177 (from anywhere in Canada and the U.S.) or on the Internet at www.cra-arc.gc.ca