Answer and Explanation:
A due on sale clause is simply a stipulation in the mortagage agreement that the
"borrower if he wants to sell the property to some other person, first of all he (borrower) shall repay the entire outstanding mortagage amount and then only it is possible to sell the property which is secured under Mortagage agreement.
Hence in essence, the borrower must repay before selling it to some other person which will result in paying the sale proceeds of house to the lender first and the Borrower again has to take loan sometimes from the same lender.
Hence it is imperative that the mortagage obligation cannot be transferred to any other person. That is any subsequent buyer cannot ASSUME the mortagage. Therefore due on sale
Clause prevents assuming of mortagages.