Based on your inputs, here's a precise breakdown: With a loan amount of $15,000 at 9% APR over 36 months, your fixed monthly payment is $477.00. Over the life of the loan, you will repay a total of $17,171.86, which includes $2,171.86 in interest. That interest makes up 14.5% of the total cost.

This means you'll pay roughly $477 each month, and after three years you'll have paid off the car plus the interest. The 9% rate is somewhat higher than current average new-car rates (which are around 6-7% for excellent credit), but it's still manageable. Your total interest cost of $2,171.86 can be compared to a lower rate loan – for instance, at 6% the interest would drop to about $1,432, saving you over $700.

Knowing this helps you decide whether to shop for a better rate or adjust the loan term to fit your budget.

Comparing your scenario to a longer term: If you extended the loan to 60 months at the same 9% rate, your monthly payment would drop to about $310 – a saving of $167 per month. However, you would pay total interest of about $3,615, which is $1,443 more than the 36-month plan. So you trade lower monthly payments for significantly higher total cost.

Alternatively, if you could secure a lower rate of 6% on a 36-month loan, your monthly payment would be roughly $456 (saving $21/month) and total interest would be $1,432, saving you $740 over the life of the loan. That's why it pays to shop around for the best APR based on your credit score.

1. Check your credit score before applying: A score above 700 could qualify you for a rate near 6-7%, saving you hundreds in interest. Even a small rate reduction makes a big difference.
2. Consider a shorter term if you can afford the payment: The 36-month term already saves you $1,400+ compared to a 60-month loan. If you can pay even more monthly, a 24-month term at 9% would cost only about $1,420 in interest.
3. Make extra payments when possible: Even one extra payment of $477 per year (applied to principal) can shorten your loan by several months and reduce total interest. Check if your lender charges prepayment penalties.
4. Refinance after building equity: If your credit improves after a year, refinancing your remaining balance at a lower rate can cut your monthly payment or shorten the term. For example, refinancing $10,600 (remaining after 12 payments) at 6% for 24 months would drop the payment to about $470 and save interest.
5. Evaluate total cost, not just monthly payment: A lower monthly payment often means longer term and more interest. Use the calculator to compare total cost for different terms and rates before signing.