This Addendum is used when the Buyer is assuming Seller's existing loan. 41-3 Redline 11.2022.First things first, what's mortgage assumption? It simply means that whomever gets awarded the house will assume the mortgage payments. In a deed of trust to secure assumption, another person assumes the note already in place, guaranteeing payment to the grantor in the deed. Edit, sign, and share assumption agreement online. No need to install software, just go to DocHub, and sign up instantly and for free. It allows one party to "assume" the rights and responsibilities of the other party.