The following incomes of the assessee shall be classified as income from business, namely:—

(a) any profit and gain of a business carried on, or deemed to be carried on, by the assessee at any time during the income year;

(b) any income derived from any trade or professional association or other association of like nature on account of specific services performed for its members;

(c) the fair market value of any benefit arising out of or in continuation of a person’s past, present or potential future business relationship, whether convertible into money or not;

(d) any management fee derived from any management company, including mudaraba management companies;

(e) any amount due to the lessor bank, insurance or ¹[finance company] against leasing to any other person of any asset owned by himself or another;

(f) realised gain from currency exchange subject to the Third Schedule;

(g) any income received during the income year from a discontinued business.