Section 28 - Gross income defined1.The term "gross income" includes gains, profit and income derived from the business, of whatever kind and in whatever form paid, including gains, profits or income from dealings in property, whether real or personal, or gains, profits, or income received as compensation for services, as interest, rents, commissions, brokerage or other fees, or otherwise in carrying on such business, including all dividends received on stocks and all interest received from federal, state, municipal or other bonds.2.If the gross income of such an association is derived from business carried on both within and without the city, "gross income" means that proportion thereof which is derived from business carried on within the city, to be allocated and determined on the basis of separate accounting for each office or branch or, at the election of the taxpayer, under rules and regulations prescribed by the director of finance.N.Y. General City Model Law § 28