In Massachusetts, what does the law say about security deposit, return deadline?
Answered for: Massachusetts
The lessor shall, within thirty days after the termination of occupancy under a tenancy-at-will or the end of the tenancy as specified in a valid written lease agreement, return to the tenant the security deposit or any balance thereof
This is Massachusetts's statute on security deposit, return deadline, in its own words.
This answer is true in Massachusetts and nowhere else on this site. Another jurisdiction is another answer, or an honest gap: see what has been read for Massachusetts.