Auto Loan Payment Formula:
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This calculator helps determine your monthly auto loan payment when trading in a vehicle that may have an outstanding loan balance. It accounts for all factors including the new vehicle price, taxes, fees, down payment, trade-in value, and any amount still owed on the trade-in.
The calculator uses two main formulas:
Where:
Explanation: The first formula calculates the net amount you need to finance after accounting for all credits and debits. The second formula calculates the fixed monthly payment that will pay off the loan over the specified term.
Details: Understanding your exact monthly payment helps with budgeting and ensures you don't overextend yourself financially. It also helps you evaluate different loan scenarios to find the most favorable terms.
Tips: Enter all dollar amounts accurately. For the trade-in section, include both what the dealer is giving you for your vehicle and any amount you still owe on it. The interest rate should be your annual percentage rate (APR).
Q1: How does a trade-in with negative equity affect my loan?
A: If you owe more than your trade-in is worth (negative equity), that amount gets added to your new loan, increasing both your principal and monthly payments.
Q2: Should I put money down if I have a trade-in?
A: A down payment can help offset negative equity or reduce your monthly payments. Even with a trade-in, a down payment is often beneficial.
Q3: How accurate is this calculator?
A: This provides a close estimate, but your actual payment may vary slightly based on lender-specific fees or calculation methods.
Q4: What if my trade-in is worth more than I owe?
A: The excess value (positive equity) will reduce the amount you need to finance for your new vehicle.
Q5: Does this account for sales tax on the trade-in difference?
A: The calculator includes the tax field where you should enter your total expected sales tax, which may be affected by your trade-in depending on local laws.