An interest-only mortgage is a type of mortgage in which the mortgagor (the borrower) is required to pay only the interest on the loan for a certain period.
The principal is repaid either in a lump sum at a specified date, or in subsequent payments.
An interest-only mortgage is one where you solely make interest payments for the first several years of the loan, as opposed to your payments including both principal and interest.
Interest-only payments may be made for a specified time period, may be given as an option, or may last throughout the duration of the loan