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Auto Loan Calculator 2025

See your real monthly car payment — enter the vehicle price, down payment, trade-in, sales tax, APR, and term to get your payment, total interest, and a full amortization schedule.

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How the Auto Loan Calculator Works

This calculator turns the numbers you negotiate at the dealership — vehicle price, down payment, trade-in value, sales tax, APR, and loan term — into the figure that actually matters: your monthly car payment. It first works out the amount financed by adding sales tax to the price and subtracting your cash down payment and any trade-in credit. That principal is then run through the standard amortization formula, which spreads the loan and all its interest evenly across every month so each payment is identical.

Alongside the monthly payment, you'll see the total interest you'll pay, the total cost of the vehicle including tax, and a month-by-month schedule you can export to CSV. The chart visualizes the split between principal and interest and shows your balance declining over the term. Defaults reflect a typical 2025 new-car purchase for a good-credit buyer — just replace them with your own numbers to see your real payment in real time.

Who Benefits Most From This Calculator

  • Car shoppers comparing vehicles at different price points to see how each affects the monthly payment.
  • Buyers weighing loan terms who want to see the 36 vs 48 vs 60 vs 72-month payment and total-interest trade-off.
  • Anyone deciding on a down payment or how much trade-in equity to apply.
  • Borrowers checking a dealer's quote against an independent calculation before signing.
  • People budgeting before they shop, so they walk in knowing exactly what they can afford.

Who Should Look Elsewhere

This tool models a standard fixed-rate, fixed-term installment loan. If you're considering a lease, the math is entirely different — leases are based on the car's expected depreciation plus a money factor, not a payoff of the full price. A lease calculator is the right tool there. If you're trying to figure out how much car you can afford from your income rather than the payment on a known price, start with the car affordability calculator. And if you already have a loan and want to see whether a lower rate would help, the auto refinance calculator compares your current payment to a refinanced one.

Tax Implications of an Auto Loan

The most significant tax on a car purchase is state and local sales tax, charged on the vehicle price — in most states on the price net of your trade-in credit, which can save you hundreds or thousands. Rates vary widely by state and county, so enter your local rate to see the true cost. This calculator applies sales tax to the price minus trade-in, matching how most states assess it.

Unlike a mortgage, interest on a personal auto loan is not federally tax-deductible. There is no equivalent of the mortgage interest deduction for a car you use personally. The one exception is business use: if you use the vehicle for self-employment or a business, you may deduct the business-use portion of the interest and operating costs, supported by mileage records. The sales tax itself can be deducted only if you itemize and elect the state-and-local sales-tax option, which falls under the $10,000 SALT cap. For most personal buyers, the practical takeaway is simple: budget for sales tax, but don't expect any income-tax benefit from the loan. Consult a tax professional for business use.

Tips, Tricks & Hidden Costs to Watch

  • Get pre-approved first — a rate from your bank or credit union is your benchmark, and it stops the dealer from marking up the APR.
  • Watch for dealer APR markup — dealers can add a percentage point or more to the rate the lender approved and keep the difference; always ask for the buy rate.
  • Consider gap insurance if you put little down — it covers the difference between what you owe and the car's value if it's totaled while you're underwater.
  • Question documentation and dealer fees — 'doc fees,' VIN etching, nitrogen tires, and paint protection are often padded or negotiable.
  • Avoid being upside-down — a 20% down payment and a term of 60 months or less keep your balance below the car's value.
  • Negotiate the price, not the payment — focusing on a monthly number lets dealers hide a longer term or higher rate.
  • Skip add-ons rolled into the loan — extended warranties and service plans financed at your APR cost far more than their sticker price.

Auto Loan Payment Formula (2025)

How your amount financed, APR, and term combine into a fixed monthly car payment.

P = (Price + Sales Tax) − Down Payment − Trade-In

Example:

$35,000 car, $5,000 down, no trade-in, 0% sales tax

(35000 + 0) − 5000 − 0
= $30,000 financed

Variables:

P - Loan principal (amount financed)
Sales Tax - (Price − Trade-In) × tax rate
Down Payment - Cash paid upfront
Trade-In - Credit for your old vehicle

M = P × [ r(1+r)^n ] / [ (1+r)^n − 1 ]

Example:

Worked example: amortize($30,000 + tax − $5,000, 6.7%, 60) on a $28,000 net financed loan

28000 × [0.005583(1.005583)^60] / [(1.005583)^60 − 1]
= ≈ $550.43 / month

Variables:

M - Monthly payment
P - Loan principal (amount financed)
r - Monthly rate (APR ÷ 12)
n - Number of payments (term in months)

Total Interest = (M × n) − P

Example:

$550.43 × 60 months on a $28,000 loan

(550.43 × 60) − 28000
= ≈ $5,026 total interest

Variables:

M × n - Sum of every monthly payment
P - Amount you originally financed

These formulas provide the mathematical foundation for the calculations. Actual results may vary based on rounding, compounding frequency, and specific lender policies.

How We Calculate & Keep This Accurate

The monthly payment is computed with the standard fixed-rate amortization formula on the amount financed — vehicle price plus sales tax, minus down payment and trade-in. Sales tax is applied to the price net of trade-in, matching how most states assess it. Default APRs reflect typical 2025 rates by credit tier from Experian's auto-finance data; the default of 6.7% represents a good-credit new-car buyer.

We don't model lease terms, manufacturer rebates, dealer-specific fees, or state-by-state tax rules beyond the trade-in credit. Results are estimates for planning and may differ from a dealer's final contract.

Data & Freshness

Figures reflect 2025 tax-year data.

Last updated June 8, 2026 · Maintained by the Financial Calculator editorial team.

Auto Loan Calculator — Frequently Asked Questions

Answers to the most common questions about monthly car payments, APR, loan terms, sales tax, and avoiding negative equity.

How is my monthly car payment calculated?

Your monthly car payment is determined by three inputs: the amount you actually finance, your annual percentage rate (APR), and your loan term in months. The amount financed isn't the sticker price — it's the vehicle price plus sales tax, minus your cash down payment and any trade-in credit. That figure becomes the loan principal. The lender then applies a standard amortization formula that spreads the principal plus all the interest evenly across every month so each payment is identical. A portion of each payment covers the interest accrued that month on the remaining balance, and the rest reduces the principal. Early in the loan more of your payment goes to interest because the balance is highest; later, more goes to principal. For example, financing $28,000 at a 6.7% APR over 60 months produces a payment of roughly $550 per month. Increasing the term lowers the monthly payment but raises total interest, while a larger down payment or trade-in lowers both the payment and the interest. This calculator recomputes all of these instantly as you adjust the inputs so you can see the trade-offs before you sign at the dealership.

How does my credit score affect my auto loan APR?

Your credit score is the single biggest factor in the APR a lender offers, and the gap between tiers is large. Borrowers with excellent credit (roughly 720 and above) typically qualify for the lowest advertised rates — around 5–7% on a new car — while those with fair credit (600–659) often pay 9–13%, and subprime borrowers below 600 can face rates of 14% to nearly 19%. On a $30,000 loan over 60 months, the difference between a 5% and a 13% APR is well over $100 a month and several thousand dollars in total interest. Lenders price by risk: a lower score signals a higher chance of missed payments, so they charge more to compensate. Before shopping, check your credit reports for errors, pay down credit-card balances to lower your utilization, and avoid opening new accounts. Getting pre-approved by your own bank or credit union gives you a benchmark rate and negotiating leverage against dealer financing. Even waiting a few months to move up one credit tier can save more than any haggling over the car's price, because the APR compounds over the entire loan term rather than being a one-time discount.

New vs used car loan rates — why the difference?

Used-car loans almost always carry higher APRs than new-car loans, often by two to four percentage points for the same borrower. There are several reasons. First, used vehicles are riskier collateral: they depreciate less predictably, may have hidden mechanical issues, and are harder for a lender to resell at a known value if they have to repossess. Second, new cars are frequently subsidized by manufacturers' captive finance arms, which offer promotional rates — sometimes 0% APR — to move inventory; those incentives don't exist on used cars. Third, used-car buyers as a group tend to have somewhat lower average credit scores, which nudges the pooled rates higher. For a buyer with good credit, a new car might finance around 6.7% while a comparable used car could be closer to 8.7%. That said, a used car's much lower purchase price usually means you finance far less money overall, so even at a higher rate your total interest and monthly payment can be lower than buying new. The right comparison is total cost of ownership — purchase price, interest, insurance, and expected depreciation — not the APR alone.

Should I roll sales tax and fees into the loan?

Rolling sales tax, documentation fees, title, and registration into your auto loan is common and convenient — it lets you drive away with little or no cash out of pocket — but it has real costs. Every dollar you finance accrues interest for the full term, so a $2,500 tax bill rolled into a 6.7% loan over 72 months ends up costing noticeably more than $2,500. More importantly, financing these non-asset costs increases the risk of going 'upside-down,' meaning you owe more than the car is worth, because taxes and fees add nothing to the vehicle's resale value while the car depreciates immediately. If you can pay the tax and fees in cash, you'll lower both your monthly payment and your total interest and start with more equity. If your budget is tight, rolling them in is acceptable, but try to offset it with a larger down payment so your loan-to-value ratio stays reasonable. Beware dealers who quietly add padded fees, extended warranties, or 'protection packages' into the financed amount — always review the itemized contract and question any line item you don't recognize before signing.

What loan term should I choose (the 60 vs 72 month trade-off)?

Loan term is a balance between a comfortable monthly payment and the total interest you pay. A longer term — 72 or even 84 months — lowers the monthly payment because the balance is spread over more months, which is why dealers love quoting long terms: the car feels affordable. But you pay interest for years longer and accumulate far more of it. On a $30,000 loan at 6.7%, a 60-month term costs about $590 a month with roughly $5,400 in total interest, while a 72-month term drops the payment to about $508 but pushes total interest above $6,600. The longer term also keeps you upside-down for much of the loan, since the car depreciates faster than you pay down the principal. A widely cited guideline is to keep auto loans to 60 months or less; if you can't afford the payment on a 48- or 60-month term, that's a strong signal the car is too expensive for your budget. Choose the shortest term whose payment you can comfortably afford, and avoid 84-month loans entirely unless the rate is exceptionally low, because the depreciation and interest risk outweigh the small monthly savings.

What does being "upside-down"/underwater mean and how do I avoid it?

Being 'upside-down' or 'underwater' on a car loan means you owe more on the loan than the vehicle is currently worth. It happens because cars depreciate fast — a new car can lose 20% of its value in the first year and roughly half within five years — while your loan balance drops slowly, especially early on when most of each payment goes to interest. Small or zero down payments, long loan terms, and rolling taxes and fees into the loan all accelerate the problem. Being underwater is dangerous: if the car is totaled or stolen, your insurance pays only the car's market value, leaving you to pay the lender the difference out of pocket, and you can't easily sell or trade in the car without bringing cash to cover the gap. To avoid it, put at least 20% down, keep the term to 60 months or less, and don't finance non-asset costs like extended warranties. If you're already underwater, gap insurance can cover the shortfall in a total-loss event, and making extra principal payments helps you catch up to the car's value faster.

Is auto loan interest tax-deductible?

For a personal-use vehicle, auto loan interest is not tax-deductible on your federal return. Unlike mortgage interest or student-loan interest, the IRS treats interest on a car you use for commuting, errands, and family life as a personal expense with no deduction, regardless of whether you itemize or take the standard deduction. The sales tax you pay when buying the vehicle can potentially be deducted, but only if you itemize and choose to deduct state and local sales taxes instead of state income taxes — and that combined deduction falls under the $10,000 SALT cap, so most buyers see no benefit. The picture changes if you use the vehicle for business: self-employed people and business owners can deduct the business-use portion of auto loan interest, along with either actual operating costs or the standard mileage rate, proportional to how much the car is driven for work. Accurate mileage logs are essential to support a business deduction. If you use your car partly for a side business or gig work, consult a tax professional to determine what portion of the interest and expenses you can legitimately claim, since the rules and recordkeeping requirements are strict.

How much should my down payment be (and the 20/4/10 rule)?

A larger down payment lowers your loan principal, which reduces both your monthly payment and the total interest you pay, and it protects you from going underwater as the car depreciates. A popular guideline is the 20/4/10 rule: put at least 20% down, finance the car for no more than 4 years (48 months), and keep your total monthly transportation costs — loan payment plus insurance — under 10% of your gross monthly income. Following all three keeps the purchase well within a healthy budget. The 20% down portion is especially important because a new car loses value the moment you drive it off the lot; a substantial down payment ensures your loan balance stays below the car's market value from day one. For used cars, where depreciation is slower, you can sometimes get away with a bit less, but 10–20% is still wise. If you can't reach a 20% down payment, it's often a sign you should choose a less expensive vehicle rather than stretching the loan term to make the payment fit. Trade-in equity counts toward your down payment, so a paid-off car you can trade in is a valuable head start.
US Auto Loan Calculator User Reviews

Disclaimer: Results are estimates for planning only and do not constitute tax, legal, lending, or investment advice. Actual paycheck and tax outcomes can vary based on employer settings, local rules, and personal elections. Consult a qualified US tax professional, CFP, or attorney before making financial decisions.