Versions of s. 261.31(2)(b)
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where the tax is payable under subsection 218.1(1) or 220.08(1), the amount determined by the formula A - (B × C) where A is the amount of that tax, B is the amount of tax that would be payable under that subsection if the service were acquired by the financial institution for consumption, use or supply exclusively in participating provinces, and C is the extent (expressed as a percentage) to which the financial institution may reasonably be regarded as holding or investing funds for the benefit of persons who are resident in participating provinces.