N.M. Code R. § 3.2.6.8
C. Gross receipts does not include the gross receipts tax, including any local option amount of tax, due. In a case where a person does not separately charge the tax or where the tax is charged at a different rate than the rate actually due, the person shall compute the amount of gross receipts net of tax as follows:
(3) equals gross receipts.
[9/29/1967, 12/5/1969, 3/9/1972, 11/20/1972, 3/20/1974, 7/26/1976, 6/18/1979, 4/7/1982, 5/4/1984, 3/31/1986, 4/2/1986, 4/26/1990, 11/20/1990, 11/15/1996; 3.2.6.8 NMAC - Rn, 3 NMAC 2.6.8, 4/30/2001; A, 7/7/2021]