How is a monthly car payment calculated?
Auto loan payments use the same amortization formula as mortgages: M = P × [r(1+r)ⁿ] / [(1+r)ⁿ–1], where P is the loan amount (car price minus down payment and trade-in), r is the monthly interest rate (APR ÷ 12), and n is the loan term in months. Example: $25,000 car, $3,000 down, $22,000 financed at 7% APR for 60 months. Monthly rate = 7% ÷ 12 = 0.5833%. Payment = 22,000 × [0.005833 × (1.005833)⁶⁰] / [(1.005833)⁶⁰ – 1] = $435.32/month.
What is a good interest rate for a car loan?
Auto loan rates in 2024–2025 by credit score tier: Excellent (720+): 5–7% for new, 6–8% for used. Good (680–719): 7–10% new, 9–13% used. Fair (640–679): 10–14% new, 13–18% used. Poor (580–639): 14–20%+. Subprime (below 580): 20–30%+. Credit unions typically offer 1–2% lower rates than banks. Always get pre-approved financing before walking into a dealership — dealers earn profit on financing and will try to negotiate monthly payment instead of total cost to obscure the interest rate.
How long should my car loan term be?
48 or 60 months (4–5 years) is the financial sweet spot. 72-month (6-year) and 84-month (7-year) loans lower monthly payments but cost significantly more in interest and create underwater risk (owing more than the car is worth). A car depreciates roughly 20% in year 1 and 15% per year after. On a $35,000 car with an 84-month loan at 8%: you pay $10,000+ in interest and will be deeply underwater for years 1–4. Financial rule of thumb: never take an auto loan term longer than 60 months for new vehicles, 48 months for used.
What is a good down payment for a car?
Financial advisors recommend 20% down on a new car and 10% on a used car. A larger down payment: reduces monthly payment, reduces total interest paid, builds positive equity immediately, and avoids being "underwater" (owing more than the car is worth). On a $35,000 new car: 20% down = $7,000 — financing $28,000 instead of $35,000 saves roughly $1,800 in interest over 60 months at 7% APR and reduces monthly payment by $131. A down payment of less than 10% combined with a long loan term virtually guarantees being underwater for 2–4 years.
Should I buy new or used?
Financially, a 2–3 year old certified pre-owned (CPO) vehicle offers the best value. New cars depreciate 20–30% in the first year — buying 2–3 years old lets someone else absorb that loss. CPO programs offer manufacturer warranties, adding peace of mind. However, new cars carry lower interest rates (automakers subsidize financing), new vehicle warranties, and the latest safety tech. The financial case: a $45,000 new car driven off the lot is worth $36,000 immediately. That same model in 2-year-old CPO condition costs ~$32,000 — you save $13,000 for effectively the same vehicle with a shorter warranty.
How does trading in a car affect my loan?
A trade-in reduces the amount you need to finance. If your trade-in is worth $8,000 and you put it toward a $30,000 car, you only finance $22,000. However, if you owe $10,000 on your trade-in (negative equity), the dealer typically rolls that $2,000 negative equity into your new loan — you start immediately underwater. Get your trade-in value from CarMax, Carvana, or KBB before visiting a dealer. Dealers often undervalue trade-ins; selling privately or to CarMax/Carvana directly typically yields $1,000–$3,000 more.
What is the total cost of a car loan?
Total cost of a car loan = total of all monthly payments. On a $28,000 loan at 7% APR: 48 months = $671/month × 48 = $32,208 total ($4,208 interest). 60 months = $554/month × 60 = $33,240 total ($5,240 interest). 72 months = $482/month × 72 = $34,704 total ($6,704 interest). 84 months = $430/month × 84 = $36,120 total ($8,120 interest). Going from 48 to 84 months saves $241/month but costs $3,912 more in interest — nearly a full extra car payment for every 2 years of extra term.
Can I pay off my car loan early?
Yes, and it saves money on interest. Unlike some mortgages, most auto loans have no prepayment penalty. Every extra payment goes directly to principal, reducing the balance that accrues interest. On a $22,000 loan at 7% APR for 60 months ($435/month): paying an extra $100/month pays off the loan in 47 months (13 months early) and saves $593 in interest. To maximize savings, make extra payments early in the loan term when the principal balance is highest. Always confirm with your lender that extra payments are applied to principal, not future payments.