Car Loan Calculator – Estimate Monthly Payments & Total Cost
Monthly Payment
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Total Loan Amount
$0.00
Total Interest Paid
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Total Cost (Price + Tax + Interest)
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Loan Term Comparison
| Term | Monthly | Interest | Total |
|---|
How Car Loans Work
A car loan is a secured installment loan where the vehicle serves as collateral, and most are structured as simple-interest amortizing loans. The lender provides funds to purchase the car, and you repay the principal plus interest in fixed monthly installments over a set term. Most car loans use simple interest (not compound interest), meaning interest is calculated on the remaining principal balance each month. As you make payments, a decreasing portion goes toward interest and an increasing portion goes toward principal -- this is called amortization.
The total amount you finance depends on several factors. You start with the vehicle price (either the sticker price or your negotiated price), subtract your down payment and any trade-in value from your current vehicle, and add applicable sales tax, title, registration, and dealer fees. If you owe more on your trade-in than it is worth (called negative equity), that difference gets added to the new loan, increasing your financed amount and monthly payment.
The interest rate you receive depends primarily on your credit score, the loan term, whether the car is new or used, and the lender. Dealerships may offer promotional rates (sometimes 0% APR) on select new models, but these often come with conditions like forgoing cash rebates. Getting pre-approved from a bank or credit union before visiting the dealership gives you negotiating leverage and a clear picture of your budget.
Car Loan Payment Formula
The standard amortization formula for calculating a car loan monthly payment is:
M = P × [r(1 + r)n] / [(1 + r)n − 1]
Where: M = monthly payment, P = principal (loan amount), r = monthly interest rate (annual rate / 12), n = total number of payments (months)
Worked Example: $30,000 Car, $5,000 Down, 5.9% APR, 60 Months
Step 1: Calculate the loan principal.
Vehicle Price: $30,000. Down Payment: $5,000. Sales Tax (7%): $30,000 × 0.07 = $2,100.
Principal (P) = $30,000 − $5,000 + $2,100 = $27,100
Step 2: Calculate the monthly interest rate.
r = 5.9% / 12 = 0.4917% = 0.004917
Step 3: Apply the formula with n = 60.
M = $27,100 × [0.004917 × (1.004917)60] / [(1.004917)60 − 1]
M = $27,100 × [0.004917 × 1.3418] / [1.3418 − 1]
M = $27,100 × 0.006594 / 0.3418 = $27,100 × 0.01930 = $523.01/month
Step 4: Total interest = ($523.01 × 60) − $27,100 = $31,380.60 − $27,100 = $4,280.60 in total interest.
Key Car Loan Terms
| Term | Definition |
|---|---|
| MSRP | Manufacturer's Suggested Retail Price -- the sticker price set by the automaker. The actual selling price is often negotiable. |
| Invoice Price | The price the dealer paid the manufacturer for the vehicle. Knowing this helps you negotiate closer to the dealer's cost. |
| APR | Annual Percentage Rate -- the yearly interest rate charged on the loan. Includes the base rate but may not include all fees. |
| Down Payment | Cash paid upfront at the time of purchase, reducing the amount financed. Experts recommend 20% for new cars, 10% for used. |
| Trade-In Value | The amount the dealer credits you for your current vehicle, applied toward the purchase of the new one. Reduces the amount financed and may reduce sales tax in some states. |
| Negative Equity | When you owe more on your current car loan than the vehicle is worth. Also called being "upside down" or "underwater." The shortfall is often rolled into the new loan. |
| GAP Insurance | Guaranteed Asset Protection insurance that covers the difference between what you owe and what insurance pays if the car is totaled. Important when you have little or no down payment. |
| Prepayment | Paying off the loan early, either through extra payments or a lump sum. Most car loans have no prepayment penalty, but always verify with your lender. |
New vs Used Car Loan Comparison
| Factor | New Car Loan | Used Car Loan |
|---|---|---|
| Typical APR Range | 4.0% - 7.0% | 5.5% - 10.0% |
| Common Terms | 36 - 72 months | 24 - 60 months |
| Depreciation (Year 1) | 15-25% loss | 10-15% loss |
| Down Payment Recommended | 20% | 10% |
| Promotional Rates Available | Yes (sometimes 0% APR) | Rarely |
| Total Cost of Ownership | Higher (depreciation + insurance) | Lower (less depreciation) |
Practical Car Loan Examples
Example 1: New Car -- $35,000 SUV
Purchase price: $35,000. Down payment: $7,000 (20%). Trade-in: $0. Sales tax: 6%. Tax amount: $35,000 × 0.06 = $2,100. Loan principal: $35,000 − $7,000 + $2,100 = $30,100. At 5.5% APR for 60 months, your monthly payment is approximately $575/month. Total interest over 5 years: approximately $4,400. Total cost: $35,000 + $2,100 + $4,400 = $41,500.
Example 2: Used Car -- $18,000 Sedan
Purchase price: $18,000. Down payment: $2,000. Trade-in: $3,000. Sales tax: 7% on $15,000 (price minus trade-in) = $1,050. Loan principal: $18,000 − $2,000 − $3,000 + $1,050 = $14,050. At 7.0% APR for 48 months, your monthly payment is approximately $336/month. Total interest: approximately $2,080. Total cost: $18,000 + $1,050 + $2,080 = $21,130.
Example 3: Luxury Car -- $60,000 Vehicle
Purchase price: $60,000. Down payment: $15,000 (25%). Trade-in: $8,000. Sales tax: 8% on $52,000 (price minus trade-in) = $4,160. Loan principal: $60,000 − $15,000 − $8,000 + $4,160 = $41,160. At 6.0% APR for 60 months, your monthly payment is approximately $796/month. Total interest: approximately $6,600. Total cost: $60,000 + $4,160 + $6,600 = $70,760. Choosing a 48-month term instead would raise the payment to about $967/month but save roughly $1,800 in interest.
How to Get a Better Car Loan Rate
- Improve your credit score: Borrowers with scores above 750 receive the best rates. Pay down existing debts, make all payments on time, and correct any errors on your credit report before applying.
- Get pre-approved: Apply for pre-approval from your bank, credit union, or an online lender before visiting the dealership. This gives you a rate to compare against dealer financing and strengthens your negotiating position.
- Choose a shorter term: Lenders typically offer lower interest rates for shorter loan terms (36-48 months vs 72-84 months) because the risk is lower.
- Make a larger down payment: Putting down 20% or more reduces the lender's risk and often qualifies you for a better rate. It also reduces your monthly payment and total interest paid.
- Shop multiple lenders: Compare rates from at least 3-5 lenders including banks, credit unions, online lenders, and the dealership. All inquiries within a 14-day window count as a single hard pull on your credit, as noted by the CFPB.
- Consider credit unions: Credit unions are member-owned and often offer rates 0.5-1.5% lower than banks. Some allow you to join with a small donation to a qualifying organization.
- Skip dealer add-ons: Extended warranties, paint protection, and fabric treatment packages are highly profitable for dealers and can be rolled into your loan. Decline these or negotiate separately.
Lease vs Buy Comparison
| Factor | Buying | Leasing |
|---|---|---|
| Monthly Payment | Higher | Lower (20-40% less) |
| Ownership | You own the car after payoff | You return the car at lease end |
| Mileage Limits | None | Typically 10,000-15,000/year |
| Customization | Allowed | Restricted |
| Long-Term Cost | Lower (keep car after loan ends) | Higher (continuous payments) |
| Best For | High-mileage drivers, long-term owners | Low-mileage, want newest models |
Frequently Asked Questions
How is a car loan monthly payment calculated?
A car loan monthly payment uses the standard amortization formula: M = P × [r(1+r)n] / [(1+r)n − 1], where P is the loan principal (vehicle price minus down payment and trade-in, plus sales tax and fees), r is the monthly interest rate (annual APR divided by 12), and n is the total number of monthly payments. This calculator handles all these inputs and shows you the exact monthly payment, total interest, and a comparison across different loan terms.
What is a good interest rate for a car loan?
Good car loan rates range from 4-7% for new cars and 5.5-10% for used cars, depending on your credit score, loan term, and lender. Borrowers with excellent credit (750+) often qualify for rates below 5%. Credit unions typically offer the lowest rates, followed by banks. Dealership financing can be competitive with manufacturer promotions (sometimes 0% APR on new models) but is often higher otherwise.
How much should I put down on a car?
Financial experts recommend putting down at least 20% on a new car and 10% on a used car. A larger down payment reduces your loan principal, lowers your monthly payment, decreases total interest paid, and significantly reduces the risk of negative equity (owing more than the car is worth). New cars lose 15-25% of their value in the first year according to Edmunds depreciation data, so a smaller down payment increases the chance of being underwater on the loan.
Should I choose a longer or shorter car loan term?
Shorter terms (36-48 months) have higher monthly payments but save thousands in total interest. Longer terms (60-84 months) reduce monthly payments but cost significantly more over the life of the loan and increase the risk of negative equity. For example, on a $25,000 loan at 6% APR, a 48-month term costs about $2,500 less in total interest compared to a 72-month term. Most financial advisors recommend keeping car loans to 60 months or less for new vehicles.
Is it better to lease or buy a car?
Buying is generally better if you drive a lot (over 15,000 miles/year), keep cars for many years, want to build equity, or want to customize your vehicle. Leasing offers lower monthly payments (typically 20-40% less than buying), newer vehicles every 2-3 years, and warranty coverage for the full lease term. However, leasing costs more in the long run because you never build equity and always have a payment. Use this calculator to see what your buying costs look like, then compare with lease quotes from dealerships.
Does trade-in value reduce sales tax on a car?
In the majority of US states, yes -- your trade-in value reduces the taxable purchase price. For example, buying a $30,000 car with a $10,000 trade-in means you only pay sales tax on $20,000 in those states. However, some states (including California, Michigan, Virginia, and a few others) charge tax on the full purchase price regardless of trade-in value. Check your state's specific rules to calculate accurately.