A. All occupation licenses shall be for the tax year for which issued and shall expire at the end of such tax year.

B. Such occupation license and the fee or tax therefor imposed by this chapter shall be for the year commencing January 1st and ending on the last day of December of each year; provided, however, that if the taxpayer in transacting his business keeps the books reflecting the same for a fiscal year not based on the calendar year, he may, with the assent of the finance director, obtain his license for the period of his current fiscal year which shares his tax year, and pay the fee or tax computed upon his gross income made during his fiscal year (next preceding his tax year) covering his accounting period as shown by the method of keeping the books of the business. [Code 1980 at § 15.04.040].