Canada Revenue Agency
http://www.cra.gc.ca/menu-eng.html

Canadian Income Tax (Personal/Individuals)
http://www.cra-arc.gc.ca/tx/ndvdls/menu-eng.html

Canadian Income Tax (Businesses)
http://www.cra-arc.gc.ca/tx/bsnss/menu-eng.html

Ontario Ministry of Revenue
http://www.rev.gov.on.ca/en/index.html

Ontario Ministry of Finance
http://www.fin.gov.on.ca/en/

Ontario Ministry of Economic Development and Trade
http://www.sbe.gov.on.ca/ontcan/1medt/en/about_main_en.jsp

Government of Canada Business Services
http://www.canadabusiness.ca/eng/

Department of Justice - Income Tax Act
http://laws.justice.gc.ca/en/I-3.3/

Canadian Institute of Chartered Accountants
http://www.cica.ca/

Institute of Chartered Accountants of Ontario
http://www.icao.on.ca/

Certified General Accountants of Ontario
http://www.cgataxresearch.org/