N.H. Rev. Stat. Ann. § 499:18-b

Except as otherwise specifically provided by the rules of the court, any person, by reason of poverty, may seek relief from the payment of any fees provided by law which are payable to any court, clerk of court, or sheriff. The court, upon the application of such person, which application may be filed without fee, may, in its discretion, order the payment of such fees waived. In any case in which a person is represented by a legal aid society, a federally funded legal services project, or counsel assigned in accordance with the rules of the court, all filing costs shall be waived by the clerk without the necessity of a court order. Fees for the service of process by sheriffs shall be a charge against the state.