Car Loan Calculator

Free Car Loan Calculator With OBBBA Tax Savings Estimator (2026)

A car loan calculator helps you estimate your monthly auto loan payment before you visit the dealership or sign financing paperwork. With the average new vehicle price in the United States exceeding $48,000 in 2026, understanding your loan terms before you commit is more important than ever. Our free car loan calculator above factors in your vehicle price, down payment, trade-in value, state sales tax, interest rate, and loan term to give you an accurate monthly payment estimate — plus it includes the brand-new OBBBA auto loan interest deduction so you can see your potential federal tax savings.

Use the calculator above to compare different scenarios: What happens if you put $5,000 more down? How much do you save with a 48-month term vs. 72 months? Does a lower APR from your credit union beat the dealer’s offer? Plug in your numbers and see your personalized results instantly, including a full amortization schedule and cost breakdown chart.

How to Use the Car Loan Calculator

Getting your estimate takes less than a minute. Start by entering the vehicle’s total price — this is the negotiated purchase price or sticker price, not including taxes or fees. Next, enter your down payment (the cash you’ll pay upfront) and any trade-in value from your current vehicle. Select your state to automatically estimate the applicable sales tax, and choose whether to roll that tax into the loan or pay it separately at signing.

Enter the annual percentage rate (APR) your lender is offering. For reference, average new car loan rates range from about 5% to 8% in 2026, depending on your credit score, lender, and loan term. Select your loan term from 24 to 84 months. Shorter terms mean higher monthly payments but less total interest; longer terms lower your monthly payment but increase the total cost significantly.

For the OBBBA tax savings section, select your filing status, enter your annual income (MAGI), and check the box if your vehicle is new and assembled in the United States. The calculator will automatically estimate your yearly deduction and tax savings based on the 2026 federal tax brackets.

Click “Calculate Car Loan” to see your monthly payment, total interest paid, total vehicle cost, amortization schedule, and OBBBA tax savings breakdown.

Understanding the OBBBA Auto Loan Interest Deduction

The One Big Beautiful Bill Act (OBBBA), signed into law on July 4, 2025, created a new federal tax deduction for auto loan interest — the first personal vehicle interest deduction in nearly 40 years. Here’s what you need to know for 2026:

Maximum deduction: Up to $10,000 per year in qualifying car loan interest can be deducted on your federal tax return. This is an above-the-line deduction, meaning you can claim it whether you itemize deductions or take the standard deduction ($16,100 for single filers, $32,200 for married filing jointly in 2026).

Who qualifies: Individual taxpayers with modified adjusted gross income (MAGI) below $100,000 (single) or $200,000 (married filing jointly) receive the full deduction. The benefit phases out above those thresholds at a rate of $200 per $1,000 of excess income, reaching zero at $150,000 single or $250,000 MFJ.

Vehicle requirements: The vehicle must be new (not used), assembled in the United States, purchased for personal use, and weigh under 14,000 pounds. Lease payments do not qualify — only loan interest on a purchased vehicle. The loan must be incurred after December 31, 2024, and you must report the vehicle’s VIN on your tax return.

Duration: This deduction is available for tax years 2025 through 2028 only. If you purchase a qualifying vehicle in 2026, you can claim the deduction for up to three tax years (2026, 2027, 2028) while paying off the loan.

Example: Sarah earns $85,000 and buys a US-assembled SUV for $40,000 with a $5,000 down payment. She finances $35,000 at 6.5% APR for 60 months. In her first year, she pays approximately $2,100 in interest. Since her income is below the $100,000 phaseout threshold, she can deduct the full $2,100, saving roughly $462 in federal taxes at the 22% bracket. Over the OBBBA-eligible years, her total tax savings could exceed $1,000.

How Car Loan Interest Is Calculated

Car loans in the United States use simple amortization, the same method used for mortgages. Each monthly payment is split between principal (paying down what you owe) and interest (the lender’s fee for lending you money). Early in the loan, a larger share of each payment goes toward interest. As the balance decreases, more of each payment goes toward principal.

The formula for calculating your monthly payment is: M = P × [r(1+r)^n] / [(1+r)^n – 1], where M is the monthly payment, P is the loan principal, r is the monthly interest rate (annual rate divided by 12), and n is the total number of payments. Our calculator does this math instantly and also generates a complete month-by-month amortization schedule so you can see exactly where each dollar goes.

Your total interest depends heavily on two factors: the APR and the loan term. A $30,000 loan at 6.5% for 60 months costs about $5,250 in total interest. The same loan at 4.5% costs about $3,550 — saving nearly $1,700 just from the rate difference. Extending the term to 72 months at 6.5% pushes total interest to about $6,400. Always compare the total cost, not just the monthly payment.

Tips for Getting the Best Car Loan Rate in 2026

Check your credit score first. Borrowers with scores above 750 typically qualify for the lowest rates (often 4-5% for new cars in 2026). Scores below 650 may see rates of 10% or higher, adding thousands in interest over the life of the loan.

Get pre-approved before visiting the dealer. Contact your bank, credit union, or online lender for a pre-approval. This gives you a baseline rate to compare against dealer financing and strengthens your negotiating position. Credit unions often offer rates 1-2% lower than big banks.

Consider a shorter loan term. While 72- and 84-month loans offer lower monthly payments, they cost significantly more in interest and increase the risk of being “upside down” (owing more than the car is worth). A 48- or 60-month term typically offers the best balance between affordability and total cost.

Make a larger down payment. Putting 20% or more down reduces your loan amount, lowers your monthly payment, and may qualify you for a better interest rate. It also protects you from negative equity if the car depreciates faster than you pay it down.

Don’t forget about sales tax. State sales tax on vehicle purchases ranges from 0% in states like Oregon, Montana, and Delaware to over 8% in Nevada. On a $40,000 vehicle, that’s a difference of $0 to $3,300+ — and if you roll it into the loan, you pay interest on that tax amount too. Use our state selector above to see the impact in your state.

Car Loan Calculator vs. Dealer Estimates

Dealership finance offices exist to make money for the dealer, not to find you the lowest rate. Dealers often mark up the interest rate from their lending partners by 1-2%, earning a commission on the difference. By calculating your expected payment independently with our car loan calculator, you can walk into the dealership knowing exactly what you should pay and whether the dealer’s offer is competitive.

Our calculator also accounts for trade-in value and sales tax — two factors that dealer quotes sometimes present in confusing ways. Knowing your total cost upfront helps you focus the negotiation on the vehicle price rather than getting drawn into monthly payment discussions that can obscure unfavorable terms.

For a complete picture of vehicle affordability including your income, existing debts, and other expenses, try our Budget Planner to see how a car payment fits into your overall financial picture. If you’re also considering buying a home, our Mortgage Calculator can help you understand how auto debt affects your housing purchasing power.

Frequently Asked Questions

What is a good APR for a car loan in 2026?

A competitive APR for a new car loan in 2026 ranges from 4% to 6% for borrowers with excellent credit (750+). Average rates for new vehicles are approximately 6-8%. Used car loans typically carry rates 1-2% higher than new car loans. Your actual rate depends on your credit score, loan term, down payment amount, and the lender you choose.

How does the OBBBA auto loan interest deduction work?

Under the One Big Beautiful Bill Act (signed July 4, 2025), qualifying taxpayers can deduct up to $10,000 per year in interest paid on a car loan for a new, US-assembled vehicle purchased for personal use. The deduction is available for tax years 2025 through 2028 and is an above-the-line deduction, meaning it benefits both itemizers and standard deduction filers. The deduction phases out starting at $100,000 MAGI for single filers and $200,000 for married filing jointly.

Should I choose a longer loan term to lower my monthly payment?

A longer term reduces your monthly payment, but significantly increases total interest paid. For example, a $30,000 loan at 6.5% costs about $5,250 in interest over 60 months but roughly $6,400 over 72 months — nearly $1,200 more. Longer terms also increase the risk of negative equity, where you owe more than the vehicle is worth. Financial experts generally recommend terms of 60 months or less for new vehicles.

Does my state’s sales tax get added to the loan?

It depends on how you structure the purchase. You can pay sales tax upfront at the time of purchase, or many dealers will roll the sales tax into your loan amount. Rolling it in means you finance (and pay interest on) a larger amount. Our calculator lets you toggle this option to see the difference in both scenarios.

Can I deduct car loan interest if I lease instead of buy?

No. The OBBBA auto loan interest deduction applies only to loan interest on purchased vehicles. Lease payments do not qualify, regardless of whether the vehicle meets the other eligibility requirements (new, US-assembled, personal use). This is explicitly stated in the law and confirmed by IRS guidance.

How much should I put down on a car?

Financial experts recommend a down payment of at least 20% for new cars and 10% for used cars. A larger down payment reduces your loan amount, lowers your monthly payment, often qualifies you for a better interest rate, and helps you avoid negative equity. On a $35,000 vehicle, a 20% down payment of $7,000 could save you over $1,500 in total interest compared to putting nothing down on a 60-month loan at 6.5% APR.

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