Massachusetts does not require bills of sale to include notary signatures. Does a bill of sale have to be notarized in Massachusetts?No. When you privately sell a car in Massachusetts, the Bill of Sale does not need to be notarized. In many cases, you are not legally obligated to notarize a bill of sale. Seek out previous service records. Make sure you have a bill of sale with your legal name and legal residential address as SELLER. And their full name and legal address as BUYER.