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Auto Loan Calculator with Trade in and Money Owed

Reviewed by Calculator Editorial Team

This auto loan calculator helps you determine your monthly payments when factoring in both your trade-in value and any existing money owed on your current vehicle. By entering your loan amount, interest rate, loan term, trade-in value, and money owed, you'll get an accurate estimate of your new loan's monthly payment.

How to Use This Calculator

Using this auto loan calculator is simple. Follow these steps:

  1. Enter the loan amount you're requesting for the new vehicle.
  2. Input the interest rate (APR) offered by the lender.
  3. Select the loan term in months.
  4. Enter the trade-in value of your current vehicle.
  5. Specify any money owed on your current vehicle.
  6. Click the Calculate button to see your results.

The calculator will display your estimated monthly payment, total interest paid, and the net amount financed after accounting for your trade-in and money owed.

Formula Used

The calculator uses the standard auto loan payment formula:

Monthly Payment = P × (r(1 + r)^n) / ((1 + r)^n - 1)

Where:

  • P = Principal amount (Loan Amount - Trade-In Value + Money Owed)
  • r = Monthly interest rate (Annual Rate / 12)
  • n = Number of payments (Loan Term in months)

This formula accounts for your trade-in value and any money owed on your current vehicle by adjusting the principal amount before calculating the monthly payment.

Worked Example

Let's say you want to finance a $25,000 vehicle with a 4.5% APR over 60 months. You have a $5,000 trade-in and $2,000 owed on your current car.

  1. Principal = $25,000 - $5,000 + $2,000 = $22,000
  2. Monthly rate = 4.5% / 12 = 0.375%
  3. Using the formula: Monthly Payment = $22,000 × (0.00375(1 + 0.00375)^60) / ((1 + 0.00375)^60 - 1)
  4. This calculates to approximately $402.50 per month

Your total interest paid over the loan term would be about $1,740, and your net amount financed would be $22,000.

Frequently Asked Questions

How does the trade-in value affect my loan amount?
The trade-in value is subtracted from your loan amount, reducing the total amount you need to finance. This can lower your monthly payments.
What happens if I have money owed on my current vehicle?
The money owed is added to your loan amount, increasing the total amount you need to finance. This will typically raise your monthly payments.
Is the interest rate the APR or the monthly rate?
The calculator uses the Annual Percentage Rate (APR) to calculate the monthly payment. The APR is the annual rate that includes all fees and points.