411. In this chapter, “cumulative Canadian development expenses” of a taxpayer, at any time in a taxation year, means the amount by which the aggregate described in section 412 is exceeded by the aggregate of(a) the Canadian development expenses incurred by the taxpayer before that time;
(a.1) all amounts determined under paragraph b of section 418.31.1 in respect of the taxpayer for a taxation year ending before that time;
(b) all amounts required by paragraph e of section 330 to be included in computing his income for a taxation year ending before that time;
(c) all amounts described in paragraph b or c of section 412 that, according to the evidence submitted by him, has become a bad debt before that time; and
(d) such part of an amount described in paragraph h of section 412 as has been repaid by him before that time pursuant to a legal obligation to repay all or any part of that amount.