If you've filed your taxes but disagree with the Notice of Assessment you receive, call 1-800-959-8281.

CRA Customer Service for Businesses and self-employed individuals
1-800-959-5525


Your Rights In your dealings with the Canada Revenue Agency


This is a .pdf Guide of your rights as a Canadian Taxpayer
http://www.cra-arc.gc.ca/E/pub/xi/rc4214/rc4214-06e.pdf

Fairness Provisions for Payments
http://www.cra-arc.gc.ca/agency/fair...ir-prov-e.html