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Auto Loan Refinance Calculator

Determine if refinancing your existing car loan makes sense. Compare monthly payment savings, lifetime interest reduction, refinance fees, and break-even months.

Current vs. New Loan Terms

Refinance Savings
Monthly Payment Savings
$40.90/mo

Break-Even: 8.6 Months

Current Monthly Payment$552.88
New Monthly Payment$511.98
Net Lifetime Interest Saved$1,613.20

Auto Loan Refinance Savings & Break-Even Formula

Net Lifetime Savings = Current Remaining Interest โˆ’ New Loan Total Interest โˆ’ Refinance Fees
  • Break-Even Period (Months) = Upfront Refinancing Fees / Monthly Payment Savings.
  • Term Extension Caution: Extending your term lowers monthly payments but can increase lifetime interest if the rate reduction is minor.

Step-by-Step Worked Example

Scenario: Refinancing a $22,000 balance from 9.5% APR down to 5.5% APR with 48 months remaining

Calculation Steps:

  1. Monthly Payment Savings = $552.88 โˆ’ $511.98 = $40.90 / month
  2. Current Remaining Interest = $4,538.24
  3. New Loan Total Interest = $2,575.04
  4. Gross Interest Saved = $4,538.24 โˆ’ $2,575.04 = $1,963.20
  5. Net Lifetime Savings (after $350 fee) = $1,963.20 โˆ’ $350 = $1,613.20
  6. Break-Even Period = $350 / $40.90 = 8.6 Months
Result: Refinancing saves $40.90 each month and $1,613.20 in net lifetime interest, breaking even in under 9 months.

How to Use This Calculator

  1. 1Enter your current loan balance, interest rate, and remaining months.
  2. 2Input the new interest rate and term offered by your prospective lender.
  3. 3Include any application, title transfer, or documentation fees.
  4. 4Check the net savings and break-even timeline.

Assumptions & Limitations

  • Assumes level monthly payments across the duration of the new loan.

Frequently Asked Questions

When is the best time to refinance an auto loan?

The best time to refinance is when your credit score has improved by 30+ points since you bought the car, when market interest rates have dropped by 1.5% to 2% or more, or if you took high-rate dealership financing that you can now replace with a credit union loan.

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