Resources – Profit Explorer

Personal Income

https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-return/completing-a-tax-return/personal-income.html

Deductions, Credits And expenses

https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-return/completing-a-tax-return/deductions-credits-expenses.html

Canadian income tax rates for individuals - current and previous years

https://www.canada.ca/en/revenue-agency/services/tax/individuals/frequently-asked-questions-individuals/canadian-income-tax-rates-individuals-current-previous-years.html

Frequently Asked Questions

https://www.canada.ca/en/revenue-agency/campaigns/about-canada-revenue-agency-cra/frequently-asked-questions-tax-implications-phoenix-payroll-issues.html

Published by Canada Revenue Agency

Canada Revenue Agency (CRA administrative tax information)
Non-resident withholding tax calculator (provided by the CRA)

For Court Cases

Tax Court of Canada (court cases)
Federal Court of Appeal (court cases)
Supreme Court of Canada (court cases)

Budget and Tax legislation

Department of Finance Canada (budget and tax legislation)

International Tax

Organization for Economic Co-operation and Development (OECD) (international tax)
Lowtax – Global Tax & Business Portal (international tax news)

Published by the Department of Finance Canada

Canada tax treaties (published by the Department of Finance Canada)
Status of Canada tax treaty negotiations (published by the Department of Finance Canada)
Canada-China income tax treaty (published by the Department of Finance Canada)

Published by the Internal Revenue Services

United States tax treaties (published by the Internal Revenue Services)

Bank of Canada

Exchange rates (Bank of Canada)

Association For Tax Professional

Tax Executive Institute, Inc. (association for tax professional)