Miss. Code Ann. § 63-21-253

(1) An owner of a motor vehicle may transfer the owner's interest in the motor vehicle to a sole beneficiary effective on the owner's death by designating a beneficiary as provided by Section 63-21-261 . (2) A beneficiary designation is: (a) Subject to Section 63-21-255 , revocable and may be changed at any time without the consent of the designated beneficiary as provided by Section 63-21-261 ; (b) A nontestamentary instrument; and (c) Effective without: (A) Notice or delivery to or acceptance by the designated beneficiary during the owner's life; or (B) Consideration. (3) A will may not revoke or supersede a beneficiary designation, regardless of when the will is made. (4) A designated beneficiary may disclaim the designated beneficiary's interest in the motor vehicle as provided by applicable law.