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Simple Interest

Moneyzine Editor
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Moneyzine Editor
1 mins
November 6th, 2024
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Definition

The term simple interest is used to describe a calculation involving the application of a rate to principal. Simple interest would be equal to the financing charge associated with the outstanding principal of a loan in one period of time.

Calculation

Simple Interest = Principal x Rate x Time

Explanation

Lenders charge borrowers a rate of interest as payment for the use of that money. The financing charge, or interest charge, is a function of the amount borrowed (outstanding principal), the length of time it is used (time), and the cost to borrow (interest rate). With an amortizing loan, the borrower repays a lender both the interest charges and principal.

Simple interest is calculated at a point in time, and is usually associated with loans. Compound interest is typically used by lenders when stating the interest earned on a deposit. For example, a bank might pay a simple interest rate of 5.000% and apply it daily to an account balance. This allows the bank to state the rate as 5.127%, compounded daily.

Example

Lindsey borrows $1,000 from a family member, promising to repay the money owed in two years. The family member has agreed to lend her this money but is charging her 10% per year for its use. Lindsey would owe this family member a simple interest charge of:

= $1,000 x 10% per year x 2 years = $200

The total amount repaid would be:

= $1,000 (in principal) + $200 (simple interest), or $1,200

Related Terms

compound interest, annual percentage rate, principal, effective interest rate or yield, ordinary annuity, annuity due, future value

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