RSA 149-I:16: Assessment Installments.

The mayor and aldermen of any city may, in their discretion, in making any assessment under this chapter, assess the same to be paid in annual installments extending over a period not exceeding 20 years, and in such case their assessment so made shall create a lien upon the land on account of which it is made and the lien of each installment so assessed shall continue for one year from October 1 of the year such installment becomes due.