The type of the loan also may affect the LTV and is considered when evaluating the collateral. Most loans include payments towards the principal balance of the mortgage. These pose the lowest risk since the LTV is decreasing as the mortgage payments are paid. Recently, interest only mortgage have become increasingly popular. These mortgages allow the borrower to make payments that simply meet the interest due on the loan without making any contribution to the principal balance. In addition, there are loans that allow negative amortization, which means the payments do not meet the interest due on loan. Therefore, the interest that is not paid is subsequently added to the principal balance of the loan. In this case, it is possible to owe more than the value of the home during the course of the loan, which exposes the lender to the highest risk.