Miss. Code Ann. Section 27-65-33 provides that any taxpayer reporting credit sales and paying the sales tax on such sales may take a credit on any subsequent return for bad debts actually charged off as uncollectible accounts. A taxpayer may not be allowed credit or refund for the sales tax associated with the uncollectible portion of a credit sale unless the taxpayer remitted the tax on the initial sales and also extended the credit used to finance the sale.
35 Miss. Code. R. 4-02-04-201