Below, you will find the only way for a Canadian person / organization to contact the IRS for personal, business or FATCA information. If you live in the US, you can call from anywhere, toll-free, and discuss tax issues and I think it’s about time they extend the same courtesy to Canada, eh?
See the IRS contact information below from the IRS website; http://www.irs.gov/localcontacts/article/0,,id=101292,00.html
If you are a taxpayer who lives outside the United States, the IRS has full-time permanent staff in 4 U.S. embassies and consulates. These offices have tax forms and publications, can help you with account problems, and answer your questions about notices and bills. You can reach these offices at the following telephone numbers, which include country or city codes if you are outside the local dialing area.
If you are calling about an e-file issue and it is not account related, please contact the
e-help Austin at 512-416-7750. Assistance is available from 7:00 a.m. to 6:00 p.m. Central time, Monday through Friday.
U. S. Consulate Frankfurt
Giessener Str. 30
60435 Frankfurt am Main, Germany
Tel:  (69) 7535-3834
FAX:  (69) 7535-3803
M-F 8 a.m. – 4 p.m. (Closed U.S. and German Holidays)
Internal Revenue Service, United States Embassy
24/31 Grosvenor Square
London W1A 1AE
United Kingdom Walk-In assistance available
Tuesday through Thursday
9:00 a.m.- 1:00 p.m. and 2:00 p.m. – 4:00 p.m.
Tel:  (207) 894-0476
9 a.m. to Noon. Monday through Friday
FAX:  (207) 495-4224
Paris United States Embassy/IRS
2 Avenue Gabriel
75382 Paris Cedex 08, France
Walk-In assistance 9:00 a.m.- noon
Phone service: M-F 1:30 p.m. – 3:30 p.m.
Tel.  (01) 4312-2555
Fax:  (01) 4312-2303
The IRS offices listed can answer your federal income tax questions, help with account and refund problems, and assist with the preparation of current and prior year tax returns.
IRS trained volunteers are also available at some embassy/consulate locations. If you are interested in becoming a volunteer, please contact one of our IRS offices.
Taxpayers located outside the US (read: CANADA) may also contact the IRS by mail at:
Internal Revenue Service
P.O. Box 920
Bensalem, PA 19020
Or you may telephone or FAX the Philadelphia Service Center office at:
Tel: 267-941-1000 (not toll-free)
Phone service available from 6:00 am to 11:00 pm (EST) M-F
Residents of Puerto Rico and the U.S. Virgin Islands may contact the IRS toll-free at 1-800-829-1040. (Hours of Operation 7:00 a.m. to 10:00 p.m. Monday – Friday).
Other items of potential interest:
International Taxpayer Advocate:
To request Taxpayer Advocate help, call:
Worldwide: Puerto Rico office:
Tel: (Spanish) 787-622-8930, (English) 787-622-8940