N.M. Code R. § 3.1.3.13
AUTHORIZED REPRESENTATIVE
B. Upon presentation of a proper authorization from a taxpayer's representative, the secretary or employee may reveal information concerning the taxpayer and the taxpayer's return. If, however, the adversarial position of the representative or some change of circumstance in the relationship between the taxpayer and the taxpayer's authorized representative leads the secretary or employee to question the continued validity of the authorization, the secretary or employee may inquire of the taxpayer whether the authorization remains valid. A taxpayer may revoke an authorization of a person to be the taxpayer's representative by filing a document with the department so stating.
[11/5/1985, 8/15/1990, 10/31/1996; 3.1.3.13 NMAC - Rn & A, 3 NMAC 1.3.13, 12/29/2000; A, 9/25/2018]