35 Miss. Code. R. 1-01-306
A taxpayer may request a copy of his filings by submitting a written request. The request must be signed by the taxpayer. In the case of a return of an individual, this request must be signed by that individual. In the case of an income tax return filed jointly, this request must be signed by either of the individuals who filed the return. In the case of a partnership, this request must be signed by a partner who was a member of the partnership during the period covered by the return requested. In the case of a return filed by a member-managed limited liability company, this request must be signed by a person who is a member of the limited liability company. In the case of a return filed by a manager-managed limited liability company, this request must be signed by a manager of the limited liability company. In the case of a return of a corporation, this request must be signed by a principal officer of the corporation and attested to by the corporation's secretary or another officer.
35 Miss. Code. R. 1-01-306