Understanding Car Loans: Simple Interest, Principal and Interest Breakdown
Written By
CarOracle Experts
Published
Jun 2, 2023
Demystify car loans with a breakdown of simple interest, principal, and more. Understand the financial aspects of purchasing a vehicle.
What is a Simple Interest Car Loan?
When you buy a car using a loan, you typically deal with a simple interest loan. Unlike compound interest, where interest is charged on the initial principal and the accumulated interest, simple interest is charged only on the original principal. The amount of interest you pay over the life of the loan is determined at the outset, and it is divided over the number of payments.
Even though the total interest is divided over the loan term, the actual breakdown of your monthly payments between principal and interest is not the same each month. The monthly payment stays the same, but the proportion that goes towards the principal and interest changes over time.
At the start of your loan, a larger portion of your monthly payment goes towards paying off the interest, and a smaller part reduces your principal. However, as the loan progresses, the amount that goes towards interest decreases, while the proportion applied to the principal increases. This happens because the interest is calculated on your outstanding loan balance, which decreases with each payment.
Sally's Car Loan Scenario
To illustrate this, let's look at a practical example. Sally is purchasing a new car with an MSRP, including destination charges, of $30,000. She negotiated $500 off the price, bringing it down to $29,500. After a down payment of $3,000, she takes out a loan of $26,500 to cover the rest. Her loan has a term of 60 months (5 years) with an annual interest rate of 8%.
The total amount of interest that Sally will pay over the life of the loan can be calculated using the simple interest formula: Principal x Rate x Time. That gives us $26,500 x 8/100 x 5 = $10,600. Divided over 60 months, this means that Sally's loan carries a flat monthly interest charge of $176.67 at the outset.
However, in reality, her interest payments won't stay flat, and they'll decrease each month. In the first month, a larger part of her monthly payment goes towards paying this interest, and a smaller part reduces the principal. As the principal decreases, the interest portion of her payment also decreases, and a larger part of her payment goes towards the principal.
By the end of her loan term, Sally's monthly payments are going mostly towards principal, with a very small amount going to interest. This becomes more apparent when using an amortization table, which simply shows how the allocation of the payment adjusts over time between the interest charge and principal.
Conclusion
Understanding how your car loan works can provide you with the knowledge needed to make informed decisions when negotiating your car purchase and managing your loan. While the concept of simple interest car loans might seem complex at first, it essentially boils down to understanding how your monthly payments are split between principal and interest over the loan term. Remember, being well-informed is key to making wise financial decisions.