N.M. Code R. § 3.1.1.16
B. If the return of a taxpayer includes reporting for two or more taxes imposed by separate tax programs, and if any of the separate taxes is understated by more than 25% of the amount of liability for the separate tax for the period to which the return relates, the secretary or secretary's delegate may make assessments for taxes imposed by any of the separate tax programs the liability for which was so understated at any time within six years from the end of the calendar year in which payment of the separate tax was due.
[7/19/67, 11/5/85, 1/4/88, 8/15/90, 10/31/96; 3.1.1.16 NMAC - Rn & A, 3 NMAC 1.1.16, 12/29/00]