Section 35-3-08-06-203.01 - Doing Business. For Mississippi income tax purposes, the term "doing business" means the operation of any enterprise or activity in Mississippi for financial profit or economic gain. For the purposes of this regulation, the terms "doing business" and "nexus" have the same meaning. Doing Business includes, but is not limited to, the following:1. The regular maintenance of an office or other place of business in Mississippi.2. The regular maintenance in Mississippi of an inventory of merchandise or material for sale, distribution or manufacture, regardless of whether kept on the premises of the taxpayer, in a public or rented warehouse, or otherwise.3. The selling or distributing of merchandise to customers in Mississippi directly from a company-owned or operated vehicle when title to the merchandise is transferred from the seller or distributor to the customer at the time of the sale or distribution.4. The regular rendering of a service to clients or customers in Mississippi by agents or employees of a foreign corporation.5. The owning, renting, or operating of business or income-producing property, real or personal, in Mississippi.6. The performing of contracts, prime or sublet work, for the construction, repair or renovation of real or personal property.35 Miss. Code. R. § 3-08-06-203.01