Assumption of Loan Requirement Letter. Assumption of Loan Requirement Letter for disaster loan servicing action request packages.SBA 504 loans can only be assumed once, and the new loan must include a "due on sale or death" clause to prohibit any future assumptions. The assumption of an SBA EIDL loan cannot be done unilaterally; it requires the agreement of both parties involved. EIDL assistance is available regardless of whether the business suffered any physical property damage.