In A Ghani, M Lee and M Kakkar, “The Passive Income Rules: New Ways To Grind the SBD” 18:4 Tax for the Owner-Manager (October 18, 2018), the authors note that
[R]egardless of whether a corporation has had multiple year-ends, these new passive income rules will aggregate all of the adjusted aggregate investment income of all of the taxation years ending in the preceding calendar year to compute the small business limit reduction.
