Income Multiple
The number by which a lender multiplies your earnings to establish how much you can borrow.

Interest
The amount charged by lenders when you borrow their money.

Interest Rate
The amount charged by lenders when you borrow their money, expressed as a percentage paid monthly.

Interest-only Mortgage
A mortgage in which you pay only the interest charges of the loan each month. You are not reducing the loan amount (the capital) and you must repay this in some other way at the end of the term.