209 CMR, § 48.03
You must keep all books, records, and accounts as required by State and federal law and regulation. If you are licensed as a debt collector or registered as a third party loan servicer, you must maintain all books, records, and accounts for a minimum of two years. If you are licensed as a student loan servicer or licensed as an automatic federal student loan servicer, you must maintain all books, records, and accounts for not less than two years following the final payment on a student loan or the assignment of a student loan, whichever occurs first, or except as otherwise required by federal law or a contract with the United States Secretary of Education under 20 U.S.C. 1087f. If you are licensed as a small loan company, check seller, foreign transmittal agency, check casher, motor vehicle sales finance company, insurance premium finance agency, retail installment sales finance company, mortgage lender, mortgage broker, mortgage company, you must maintain all books, records, and accounts for a minimum of three years. This includes, but is not limited to, a complete customer account history for each transaction including but not limited to terms and conditions of the agreement, payment dates, maturity or final payment due date, refunds, refinancing date, collection or legal action taken.
209 CMR, § 48.03