N.H. Rev. Stat. Ann. § 491:6-a

The justices and marital masters shall be entitled to receive their actual personal expenses when absent from their assigned court in the performance of their official duties. The justices and marital masters shall not be reimbursed for mileage to commute from the justice's or marital master's residence to their assigned court except for any mileage in excess of 50 miles each way.