The Massachusetts Affidavit of Service for Chapter 13 Plan is a legal document that is used to prove that an individual has been properly served with a Chapter 13 Plan. This document is used to prove that the debtor and their creditors have been notified of the plan and have received a copy of the plan. It is also used to prove that the plan has been filed in the bankruptcy court. There are two types of Massachusetts Affidavit of Service for Chapter 13 Plan: 1. The First Class Mail Affidavit of Service: This affidavit is used to prove that the plan was sent to the debtor and their creditors via first class mail. It must be signed by the individual who mailed the plan and include their name, address, and date of service. 2. The Personal Service Affidavit of Service: This affidavit is used to prove that the plan was personally served to the debtor and their creditors. It must be signed by the individual who served the plan and include their name, address, and date of service.