reviewing the approach to the special provisions on deducting specific expenses of salary income earners, including the criteria for determining applicability (meaning the amounts specified in the items of Article 57-2, paragraph (1) of the Income Tax Act for the categories of cases set forth in those items) and the scope of deductible expenses, from the perspective of reducing the burden on salary income earners and expanding the opportunities to deduct actual expenses, while taking into account the effects and other results of the measures taken so far;