Mass. Gen. Laws ch. 60 § 62A
Municipalities may by bylaw or ordinance authorize payment agreements between the treasurer and persons entitled to redeem parcels in tax title. Such agreements shall be for a maximum term of no more than 5 years or such lesser period as the ordinance or bylaw may specify and may waive not more than 50 per cent of the interest that has accrued on the amount of the tax title account, subject to such lower limit as the ordinance or bylaw may specify. An ordinance or bylaw under this section shall provide for such agreements and waivers uniformly for classes of tax titles defined in the ordinance or bylaw.
Any such agreement must require a minimum payment at the inception of the agreement of 25 per cent of the amount needed to redeem the parcel. During the term of the agreement the treasurer may not bring an action to foreclose the tax title unless payments are not made in accordance with the schedule set out in the agreement or timely payments are not made on other amounts due to the municipality that are a lien on the same parcel.
Mass. Gen. Laws ch. 60, § 62A