C. As used in this section, “bad debt” means the taxes under this chapter attributable to any portion of a debt that is related to a sale of cigarettes subject to tax under this chapter that is not otherwise deductible or excludable, that has become worthless or uncollectible in the time period between the date when taxes accrue to the Department for the stamping agents’ preceding tax return and the date when taxes accrue to the Department for the present return, and that is eligible to be claimed, or could be eligible to be claimed if the stamping agent kept accounts on an accrual basis, as a deduction pursuant to § 166 of the Internal Revenue Code. A bad debt shall not include (i) any interest on the wholesale price of cigarettes, (ii) uncollectible amounts on property that remains in the possession of the stamping agent until the full purchase price is paid, (iii) expenses incurred in attempting to collect any account receivable or any portion of the debt recovered, (iv) any accounts receivable that have been sold to a third party for collection, and (v) repossessed property.