NH HB1647

Requires all New Hampshire municipalities, cities, and towns to adopt farm structure tax provisions by April 1, 2027, replacing the current optional local adoption system

Mandates that qualifying farm structures be assessed at no more than replacement cost minus depreciation, and land beneath farm structures at no more than 10% of market value

Expands the definition of "qualifying farm structure" to include farms, barns, greenhouses, silos, poultry houses, maple sugar houses, processing sheds, and portions of primary residences used for homestead food operations or farm production

Imposes a recapture tax when property no longer qualifies: if conversion occurs within 5 years, owner pays the difference between reduced taxes paid and full market value taxes; after 5 years, tax equals 10% of full market value at conversion

Requires property owners to notify local tax assessors within 60 days of any disqualifying changes, with unpaid taxes accruing interest and subject to liens under existing collection procedures