Canadian tax guides
Written to answer the question you actually searched, with a link to the CRA or Income Tax Act source behind every claim. No dollar estimates, no “you could be owed thousands” — just what the rule is and where it lives.
The 10-year rule: how far back you can fix a Canadian tax return
Canada lets individuals ask the CRA to reassess a personal return up to 10 calendar years back. Which years are still open, which channel reaches them, and the deadlines that are shorter than 10 years.
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Commonly missed Canadian tax credits and deductions
The credits and deductions Canadians most often leave unclaimed — what each one is, who it applies to, and the CRA form or line it belongs on.
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More guides are in progress, including income tax rates and small-business rates by province. We publish one when it has something specific to say about that province — not to fill a grid.