979.7. The deduction contemplated in section 979.6 may not exceed, where the market-maker is an employee, the least of(a) the amount by which $65,000 exceeds the guaranteed remuneration received by him in the year in respect of his employment as market-maker;
(b) 50% of the profits paid to him in the year otherwise than in the form of guaranteed remuneration; or
(c) the amount by which the sum of $500,000 plus the aggregate of the amounts withdrawn by him from his reserve account for contingent losses in the year or a previous taxation year and then included in computing his income exceeds the aggregate of the deductions he is allowed to make under section 979.6 for the previous taxation years.