A.   Undue Burden Prohibited: None of the license taxes provided for by this Chapter shall be so applied as to occasion an undue burden upon interstate commerce or be violative of the equal protection and due process clauses of the Constitutions of the United State and the State of California.
   B.   Tax Adjustment Procedure: In any case where a license tax is believed by a licensee or applicant for a license to place an undue burden upon interstate commerce or be violative of such constitutional clauses, he/she may apply to the Collector for an adjustment of the tax. Such application may be made before, at, or within six (6) months after payment of the prescribed license tax. The applicant shall, by sworn statement and supporting testimony, show this method of business and the gross volume or estimated gross volume of business and such other information as the City may deem necessary in order to determine the extent, if any, of such undue burden or violation. The City shall then conduct an investigation, and, after having first obtained the written approval of the City Attorney, shall fix as the license tax for the applicant, an amount that is reasonable and nondiscriminatory, or if the license tax has already been paid, shall order a refund of the amount over and above the license tax so fixed. In fixing the license tax to be charged, the City shall have the power to base the license tax upon a percentage of gross receipts or any other measure which will assure that the license tax assessed shall be uniform with that assessed on businesses of like nature, so long as the amount assessed does not exceed the license tax as prescribed by this Chapter. Should the City determine the gross receipts measure of license tax to be the proper basis, the applicant may be required to submit, either at the time of termination of applicant's business in the City, or at the end of each three (3) month period, a sworn statement of the gross receipts and pay the amount of license tax therefor; provided, that no additional license tax during any one calendar year shall be required after the licensee shall have paid an amount equal to the annual license tax as prescribed in this Chapter. (1996 Code)