Interest rate

An interest rate is a percentage of the principal amount of a loan that is paid for the use of the loaned funds. For example, an annual payment of $6,000 for the use of a $100,000 loan is a 6% interest rate. A reasonable interest rate is derived from the market interest rate, plus the perceived ability of the borrower to pay back the funds.

If the interest rate is compounded, this means that the borrower owes not just the interest rate on the original debt, but also on any accrued interest.