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before sending the notice of assessment for the year, where the taxpayer is, for any purpose of the definition refundable investment tax credit (as defined in subsection 127.1(2)), a qualifying corporation (as defined in that subsection) and claims in its return of income for the year to have paid an amount on account of its tax payable under this Part for the year because of subsection 127.1(1) in respect of its refundable investment tax credit (as defined in subsection 127.1(2)), refund all or part of any amount claimed in the return as an overpayment for the year, not exceeding the amount by which the total determined under paragraph (f) of the definition refundable investment tax credit in subsection 127.1(2) in respect of the taxpayer for the year exceeds the total determined under paragraph (g) of that definition in respect of the taxpayer for the year,