Versions of s. 181.5(4.1)
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For the purposes of applying subsection 125(5.1), the definitions unused surtax credit in subsections 181.1(6) and 190.1(5), and subsection 225.1(8), subsections (2) to (4) are to be read as if the amount determined under subsection (2) or (3), as the case may be, in respect of the corporation for the taxation year were that proportion of $10 million that the amount otherwise determined in respect of the corporation for the taxation year under that subsection is of $50 million.