N.H. Rev. Stat. Ann. § 231:30

All assessments made under the provisions of RSA 231:29 shall create a lien upon the lands on account of which they are made, which shall continue following the assessment until fully discharged in accordance with the terms set by each governing board or in compliance with any court judgment. Such assessments shall be subject to interest and such other charges as are applicable to the collection of delinquent taxes.