How Monthly Payment is Calculated
Standard Loan Formula:
Monthly Payment = P × [r(1+r)^n] / [(1+r)^n − 1]
Where:
• P = Loan Amount (Auto Price + Tax + Fees − Down Payment − Trade-in)
• r = Monthly Interest Rate (Annual Rate ÷ 12 ÷ 100)
• n = Total Number of Payments (Loan Term in Months)
Key Factors That Affect Your Payment
- Down Payment: Larger down payment = smaller loan = lower monthly payment and less interest.
- Loan Term: Longer terms lower monthly payments but increase total interest paid.
- Interest Rate: Even small differences in rate have a big impact over time.
- Trade-in: Reduces the amount you need to finance.
Important Tips
- Shop around for the best interest rate — even 1% can save thousands.
- Consider making a larger down payment if possible.
- Shorter loan terms save money on interest but increase monthly payments.
- Factor in insurance, maintenance, and fuel costs when budgeting for a car.