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I

Improvements	Permanent additions that increase the value of a home.
Income/Expense Ratio	Ratio of operation expenses to gross income and expressed as a percentage (also known as operating ratio) .
Index	Benchmark measure of current interest levels, used to calculate periodic changes in rates charged on adjustable rate mortgages.
Interest Adjustment Date (IAD)	The date on which the mortgage really begins, usually the first of the month. The borrower is required to pay interest on the loan between the date of receiving the funds and the IAD before regular mortgage payments start.
Interest Only Loan	Borrower pays back interest only on the loan and there is no amortization until later or until the end of the term. This may occur when a purchaser wishes to resell property after a short period or if he wishes to build up enough income from the property before amortization.