N.H. Rev. Stat. § 72:76
An eligible municipality may, by vote of the local legislative body pursuant to RSA 72:77, adopt a new construction property tax exemption for commercial or industrial uses, or both. The exemption shall apply only for municipal and local school property taxes assessed by the municipality which shall exclude state education property taxes under RSA 76:3 and county taxes assessed against the municipality under RSA 29:11, and shall be a specified percentage on an annual basis of the increase in assessed value attributable to construction of new structures, and additions, renovations, or improvements to existing structures. The exemption may run for a maximum period of 10 years following the new construction; provided, however, that the exemption for all years shall cumulatively not exceed 500 percent of the increased assessed value. Once adopted by the local legislative body, the percentage rate and duration of the exemption shall be granted uniformly within that municipality to all projects for which a proper application is filed.
RSA 72:76
2008, 224:2, eff. July 1, 2008.