Interest Adjustment Date (IAD)
The date on which the mortgage term will begin. This date is usually the first day of the month following the closing. The interest cost for those days from the closing date to the first of the month are usually paid at closing. That is why it is always better to close your deal towards the end of the month.

Interest-Only Mortgage
A mortgage on which only the monthly interest cost is paid each month. The full principal remains outstanding. The payment is lower than an amortized mortgage since once is not paying any principal.