A lot of lenders want to make sure they are collecting their APR on a loan for a period of time so that the investment is a valid transaction. You have to think of this one from the lender's side of the transaction. They could do other things with that money and invest it in other assets classes or investment vehicles. Because of that, a lot of times they will put Prepayment Penalties to recoup the losses that they may incur for having their total loan amount paid before a certain date.