N.H. Rev. Stat. Ann. § 79:6

Unless a bond or other security is required pursuant to RSA 79:10-a, all normal yield tax assessments levied under RSA 79:3 shall, on the date the cutting commences, create a lien upon the lands on account of which they are made and against the owner of record of such land. Furthermore, such liens shall continue for a period of 18 months following the date upon which the local assessing officials receive the report of cut required by RSA 79:11. All normal yield tax assessments shall be subject to statutory collection proceedings against real estate as prescribed by RSA 80.