Auto.refinance Calculator

Use this auto refinance calculator to estimate your potential savings when refinancing your auto loan. Compare different interest rates, loan terms, and monthly payments to make an informed decision about refinancing your vehicle.

How to Use This Calculator

Enter your current auto loan details and the new loan terms you're considering to calculate your potential savings. The calculator will show you:

Your current monthly payment
Your new estimated monthly payment
Total interest paid over the life of the loan
Total savings from refinancing

You can also visualize the payment comparison with the built-in chart. Adjust the inputs to see how different rates and terms affect your results.

Formula Used

The calculator uses the standard auto loan payment formula:

Monthly Payment Formula

P = L × [r(1 + r)^n] / [(1 + r)^n - 1]

Where:

P = Monthly payment
L = Loan amount
r = Monthly interest rate (annual rate ÷ 12)
n = Number of payments (loan term in years × 12)

The total interest paid is calculated by multiplying the monthly payment by the number of payments and subtracting the original loan amount.

Worked Example

Let's say you have a $20,000 auto loan with a 5% annual interest rate and a 4-year term. Your current monthly payment would be:

Current Monthly Payment Calculation

r = 5% ÷ 12 = 0.004167

n = 4 × 12 = 48

P = $20,000 × [0.004167(1 + 0.004167)^48] / [(1 + 0.004167)^48 - 1]

P ≈ $467.50

If you refinance to a 3.5% rate with the same term, your new monthly payment would be approximately $428.50, saving you about $1,200 in interest over the life of the loan.

Benefits of Auto Refinancing

Refinancing your auto loan can provide several advantages:

Lower monthly payments
Reduced total interest paid
Potential tax benefits
Opportunity to switch lenders for better service
Ability to extend or shorten the loan term

Important Note

Refinancing typically requires good credit and may have fees that could offset some savings. Always compare the total cost of refinancing before making a decision.

Important Considerations

Before refinancing your auto loan, consider these factors:

Credit score requirements
Refinancing fees and closing costs
Impact on insurance rates
Vehicle equity and trade-in value
Potential for future interest rate changes

It's also important to compare the total cost of refinancing, including fees, with the potential savings over the life of the loan.

Frequently Asked Questions

How often should I refinance my auto loan?: Auto loan interest rates change frequently. If you can refinance at a significantly lower rate, it may be worth doing so. However, refinancing too often can lead to higher fees and may not always provide meaningful savings.
Can I refinance a car loan with bad credit?: Yes, but you may need to pay higher interest rates or fees. Specialized lenders cater to subprime borrowers, but interest rates and terms will typically be less favorable than for borrowers with good credit.
Will refinancing hurt my credit score?: Refinancing can temporarily lower your credit score as it's reported as a hard inquiry. However, if you're approved and make payments on time, your score should recover and may even improve over time.
How long does it take to refinance an auto loan?: The refinancing process typically takes 30 to 45 days, though some lenders can process it in as little as 7 days. The exact time depends on your lender and whether you need an appraisal.
Can I refinance a car loan with a balloon payment?: Yes, some lenders offer balloon payment refinances, where most of the loan is paid off at the end of the term. This can result in lower monthly payments initially but may not be suitable for everyone.