An operator is relieved from liability for the remission to the city of the tax imposed under this chapter insofar as the measure of the tax is represented by accounts which have been found to be worthless and charged off for income tax purposes. If the operator has previously remitted the tax, he or she may, pursuant to procedures prescribed by the assessor-collector, take as a deduction the amount of tax previously remitted for the worthless and charged off account. If any such accounts are thereafter in whole or in part collected by the operator, the amount so collected shall be included in the first return filed after such collection and the tax on such amount paid with the return. (Prior code § 41.04.027a)