US Car Finance Comparison Calculator

About US Car Finance Comparison Calculator

This car finance comparison calculator helps you compare the three main ways to pay for a car in the US: a traditional auto loan, a lease, and a cash purchase. Enter the vehicle price, your down payment, and the specifics for each option to see monthly payments, total cost, and total interest or fees side by side. It is designed for US buyers and uses standard American loan and lease formulas.

How Auto Loans, Leases, and Cash Purchases Work

Each financing method uses a different payment structure, and each gives you a different relationship with the vehicle.

Traditional Auto Loan uses standard amortisation. You borrow the vehicle price minus your down payment and trade-in, then repay it in fixed monthly installments. The formula is:

Monthly Payment = P x r / (1 - (1 + r)^-n)

Where P is the amount financed, r is the monthly interest rate (APR / 12 / 100), and n is the number of months.

Worked example (Auto Loan): A $35,000 car with a $5,000 down payment and no trade-in, financed for 60 months at 6.5% APR. Amount financed = $30,000. Monthly rate = 0.065 / 12 = 0.005417. Monthly payment = 30,000 x 0.005417 / (1 - 1.005417^-60) = $586.87. Total paid = $5,000 + ($586.87 x 60) = $40,212.20. Total interest = $5,212.20.

Car Lease works differently from a loan. You pay for the depreciation during the lease term, not the full vehicle value. The lease payment has two parts:

Depreciation fee = (Capitalized Cost - Residual Value) / Term Months

Finance fee = (Capitalized Cost + Residual Value) x Money Factor

Monthly payment = Depreciation fee + Finance fee

The capitalized cost is the negotiated price minus your down payment (also called a cap cost reduction) plus any rolled-in fees like the acquisition fee. The residual value is the car's predicted worth at lease end, set by the leasing company as a percentage of MSRP.

Worked example (Lease): MSRP of $35,000, $3,000 down, 36 months, 55% residual, money factor of 0.00125, $895 acquisition fee. Capitalized cost = $35,000 - $3,000 + $895 = $32,895. Residual = $35,000 x 0.55 = $19,250. Depreciation per month = ($32,895 - $19,250) / 36 = $379.03. Finance fee = ($32,895 + $19,250) x 0.00125 = $65.18. Monthly = $379.03 + $65.18 = $444.21. Total = $3,000 + ($444.21 x 36) + $350 disposition fee = $19,341.56.

Cash Purchase is the simplest option. You pay the full price minus any trade-in credit. No interest, no monthly payments, and no lien on the title. For a deeper look at loan amortisation schedules, try the auto loan calculator.

Loan vs Lease vs Cash - How Do They Compare?

The right choice depends on your budget, how long you want the car, and how much you drive.

Feature	Auto Loan	Lease	Cash
Monthly payment	Higher	Lower	None
Total cost (over term)	Medium	Medium-High (no asset at end)	Lowest
Ownership	After final payment	Never (return car)	Immediate
Mileage limits	No	Yes (10K-15K/yr typical)	No
Down payment	Recommended 20%	Optional but reduces monthly	Full price
Typical terms	36-72 months	24-36 months	N/A
Best for	Keeping the car 5+ years	Driving a new car every 2-3 years	Avoiding all interest costs

According to Experian's State of the Automotive Finance Market report (Q3 2025), the average new car loan was $42,332 at 6.56% APR for 68 months. The average lease payment was $596/month. About 84% of new car buyers use financing, with roughly 22% choosing a lease.

If you want to check how much car fits your monthly budget before comparing options, the car affordability calculator can help.

Understanding the Money Factor on a Lease

The money factor confuses a lot of people because it looks like a tiny decimal rather than a familiar percentage. To convert a money factor to an approximate APR, multiply it by 2,400. For example:

Money Factor	Approximate APR	Rating
0.00042	1.0%	Excellent (subvented)
0.00083	2.0%	Very good
0.00125	3.0%	Good
0.00208	5.0%	Average
0.00292	7.0%	Below average
0.00375	9.0%	Poor credit

Manufacturers sometimes offer subvented (subsidized) lease deals with very low money factors to move inventory. These promotional rates can make leasing significantly cheaper than financing with a loan, especially on vehicles that hold their value well.

The acquisition fee (sometimes called a bank fee) is charged by the leasing company to set up the lease. It typically ranges from $595 to $1,095. Some dealers roll it into the capitalized cost, which increases your monthly payment slightly. The disposition fee is charged at lease end when you return the car, usually $300 to $500.

Tips for Getting the Best Car Deal

Get pre-approved before visiting the dealer. Check rates from your bank, a credit union, and at least one online lender. Having a pre-approval gives you a stronger position to negotiate the dealer's financing offer. Credit unions often have the lowest rates, especially for used cars.

Negotiate the price, not the monthly payment. Dealers can hit any monthly target by stretching the term or adjusting the rate. A $400/month payment sounds great until you realize it is spread over 84 months. Focus on the out-the-door price first, then arrange financing separately.

Watch the loan term. Stretching a loan to 72 or 84 months reduces the monthly payment but dramatically increases total interest. You also risk being underwater (owing more than the car is worth) for much of the loan. The sweet spot for most buyers is 48-60 months.

Know your lease mileage needs. Standard lease mileage allowances are 10,000, 12,000, or 15,000 miles per year. Excess mileage charges typically run $0.15 to $0.30 per mile. If you drive 15,000 miles per year on a 10,000-mile lease, you will owe $2,250 to $4,500 in excess charges at the end of a 3-year lease. Negotiating a higher mileage allowance upfront is almost always cheaper than paying per-mile penalties later.

Consider total cost of ownership, not just the payment. Insurance, fuel, maintenance, and depreciation are big factors. The total cost of ownership calculator helps you see the full picture beyond just financing.

Be cautious about rolling negative equity into a new loan. If you owe more than your current car is worth, some dealers offer to pay off your old loan and add the difference to your new loan. This puts you in a deeper hole from day one. If you must trade in a car with negative equity, pay down the shortfall with cash first if possible.

Common Mistakes When Financing a Car

Focusing only on monthly payment. This is the most common mistake. A dealer can make a $50,000 car fit a $500 budget by extending the loan to 84 months. But that $500/month for 7 years adds up to $42,000 in payments - on a car that might be worth $18,000 by the time you pay it off.

Skipping gap insurance on a lease or long loan. If the car is totaled or stolen, your auto insurance pays the current market value, which might be less than what you owe. Gap coverage pays the difference and typically costs $20-$40 per year when purchased from your insurer (not the dealer, who may charge $500+).

Putting too much down on a lease. If the car is totaled early in the lease, you lose your entire down payment because the insurance payout goes to the leasing company. Many financial advisors suggest minimizing the down payment on leases for this reason.

Ignoring the residual value. A higher residual means lower monthly lease payments because you are paying for less depreciation. Cars that hold their value well (Toyota, Lexus, Honda, Porsche) tend to have better lease deals. Check residual values on ALG or Edmunds before signing.

Not reading the lease wear-and-tear policy. Lease companies inspect the car when you return it. Normal wear is expected, but dents, scratches, interior damage, and worn tires can result in charges of $500 to $2,000 or more. Review the lease company's wear guidelines before turn-in and fix any obvious damage yourself if the repair cost is less than the penalty.