Rate of Interest Love Machine 16 years ago Rate of Interest The percentage of the principal charged by lender from borrower in exchange for use of the funds. Typically calculated on an annual basis. Random Finance Terms for the Letter S Range Forward RAR Ratable Accrual Method Rate Anticipation Swaps Rate Lock Rate of Change Rate of Interest Rate of Return Ratios Rate of Return Regulation Rate Risk Recommended for you: Rate Lock Rate Anticipation Swaps Rate Risk Rate of Return Ratios