
Quoting
Chapter 186: Section 15B(3)(b)
A lessor of residential real property who holds a security deposit pursuant to this section for a period of one year or longer from the commencement of the term of the tenancy shall, beginning with the first day of the tenancy, pay interest at the rate of five per cent per year, or other such lesser amount of interest as has been received from the bank where the deposit has been held payable to the tenant at the end of each year of the tenancy. Such interest shall be paid over to the tenant each year as provided in this clause, provided, however, that in the event that the tenancy is terminated before the anniversary date of the tenancy, the tenant shall receive all accrued interest within thirty days of such termination. Such interest shall be beyond the claims of such lessor, except as provided for in this section. At the end of each year of a tenancy, such lessor shall give or send to the tenant from whom a security deposit has been received a statement which shall indicate the name and address of the bank in which the security deposit has been placed, the amount of the deposit, the account number, and the amount of interest payable by such lessor to the tenant. The lessor shall at the same time give or send to each such tenant the interest which is due or shall include with the statement required by this clause a notification that the tenant may deduct the interest from the tenant’s next rental payment. If, after thirty days from the end of each year of the tenancy, the tenant has not received such notice or payment, the tenant may deduct from his next rent payment the interest due.