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Step chart showing how the federal small business deduction limit drops to zero as passive investment income rises from $50,000 to $150,000.

This week's energy rally, with Canadian Natural, Suncor, and Cenovus all posting strong single-session gains, adds directly to a CCPC's adjusted aggregate investment income. That income does not affect this year's tax bill; it determines how much of next year's small business deduction survives, since the AAII used in the calculation is measured with a one-year lag. The window to manage that number closes December 31.

This chart is presented for general informational purposes only and does not constitute financial, investment, tax, or legal advice. Figures reflect the source and period indicated and may no longer be current.

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Charts and data on this site are provided for general informational and educational purposes only and do not constitute financial, investment, tax, or legal advice. Each chart reflects the source and period indicated on it and may not represent current market conditions.

Charts may be downloaded and shared freely for professional or educational use, including in client presentations, reports, and publications, with no attribution or permission request required. Charts may not be altered, edited, or cropped: each is a specific, time-stamped dataset, and an altered copy no longer accurately represents that record.

© 2026 The Canadian Index. A public reference library of Canadian financial market charts, updated daily from public market data. See the Legal and Usage Terms page for full disclaimers.