N.H. Rev. Stat. Ann. § 44:10-a

Every city, by its council, may establish a contingency fund to meet the cost of unanticipated expenses that may arise during the year. Such fund shall not exceed one percent of the amount expended by the city for city purposes, exclusive of school department costs, capital expenditures and amortization of debt during the preceding year. A detailed report of all expenditures from the contingency fund shall be made annually by the treasurer and published in his report.