N.M. Stat. § 46-3A-402
Distribution from trust or estate.
A trustee shall allocate to income an amount received as a distribution of income
from a trust or an estate in which the trust has an interest other than a purchased
interest, and shall allocate to principal an amount received as a distribution of principal
from such a trust or estate. If a trustee purchases an interest in a trust that is an
investment entity, or a decedent or donor transfers an interest in such a trust to a
trustee, Section 401 or 415 [46-3A-401 to 46-3A-415 NMSA 1978] applies to a receipt
from the trust.