In the event an employing unit fails to submit payment in an amount sufficient to satisfy the total amount of outstanding debt for any current or past-due contributions, interest or penalty, the amount of the underpayment shall be applied in the following order: first, to any contributions and excess claims premiums due, second, to any interest due and third, to any penalties due, from the oldest debt to the newest.
N.M. Admin. Code § 11.3.400.426