If the retailer is not registered to do business in Mississippi and the primary seller has nexus with Mississippi the sale to the retailer is a taxable transaction by the primary seller who is responsible for remitting the tax. An exception occurs when one of the following conditions are met:
1. The Mississippi customer is a licensed dealer purchasing the property for resale through his regular course of business. The primary seller can obtain a copy of the Mississippi customer's sales tax permit and the resale exemption may flow through the retailer to the seller. 2. The Mississippi customer has a Direct Pay Permit. The Direct Pay Permit authorization may flow through the retailer to the seller. 3. The Mississippi customer is an exempt entity under the provision of the Mississippi Sales Tax Law. The Mississippi customer must furnish proof of exempt status to the seller. If proof of such exemption is not furnished, the sale is taxable. 35 Miss. Code. R. § 4-03-05-303