Canada Customs and Revenue Agency
CCRA

US Internal Revenue Service
IRS

The Guide for Canadian Small Businesses provides useful information on a broad range of issues, such as how to set up a business, the GST/HST, excise taxes and duties, importing/exporting, payroll deductions, and income tax.

Guide for Canadian Small Businesses

Canada's Business and Consumer guide. Strategis was launched on March 27, 1996 in order to harness the power of the Internet to provide business and consumer information to all Canadians without the constraints of time and geography.

Strategis

Ontario Business Connects.
Offers information on business registration, incorporation and answers to other start-up questions.

Ontario Business Connects