Auto Loan Calculator – Real Monthly Payment Including Tax & Fees
Can you afford this car?
Auto Loan Calculator
Monthly Payment · Total Interest · Equity vs Depreciation · Rate Sensitivity
Results update in real time as you adjust any input.
Results are estimates only and do not constitute financial, tax, or legal advice. Consult a qualified professional before making financial decisions.
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An auto loan calculator sounds simple — enter the price, get a payment. But the number dealers quote you is almost never the number that matters. The sticker price doesn't include sales tax, dealer fees, or how your trade-in is actually applied. The monthly payment they show you doesn't tell you what the car actually costs. This calculator does both. Enter the vehicle price, your down payment, trade-in value, loan term, APR, sales tax rate, and fees. You'll see the real monthly payment, how much of each payment is interest, and the total cost of the vehicle over the life of the loan — not just the number you're handing over each month. The two numbers most people ignore are total interest paid and loan term length. A $35,000 car at 7.5% APR over 72 months costs $7,200 in interest. Shorten it to 48 months and that drops to $4,700 — a $2,500 difference for the same car. Knowing these numbers before you walk into a dealership changes the entire negotiation. Dealers focus on monthly payment precisely because it obscures the total cost.
- ·Sales tax is applied to the full vehicle price before subtracting trade-in value (varies by state — some states tax only the difference)
- ·Dealer fees and documentation fees are financed into the loan (most buyers do this)
- ·Assumes a fixed APR for the full loan term
- ·Trade-in value is applied as a direct credit against the purchase price
- ·Does not include gap insurance, extended warranties, or other dealer add-ons
Loan amount = (Vehicle price + sales tax + dealer fees) – down payment – trade-in value Monthly payment = Loan amount × [r(1+r)^n] / [(1+r)^n – 1] Where: r = monthly interest rate (APR ÷ 12) · n = number of monthly payments (term in months). Total interest = (Monthly payment × n) – Loan amount Example: $28,500 vehicle · 6.25% sales tax ($1,781) · $650 fees · $2,000 trade-in · $0 down · 60-month term · 7.9% APR → Loan amount: $28,931 → Monthly payment: $587 → Total interest: $6,289 → Total cost: $35,189.
- →Before visiting a dealership — know your real maximum monthly payment before they show you theirs
- →Comparing 48 vs 60 vs 72-month terms — see how each changes total interest, not just payment
- →Evaluating a trade-in offer — see whether rolling it in actually lowers your cost
- →Shopping rates across lenders — plug in different APRs to see the dollar impact
- →Deciding how much to put down — see how each extra $1,000 affects payment and total interest
Example 1: Used SUV — comparing 60 vs 48 months
Inputs: Price: $28,500 · Trade-in: $2,000 · Tax: 6.25% · Fees: $650 · Down: $0 · APR: 7.9%
Result: 60 months: $587/mo · total interest $6,289 | 48 months: $717/mo · total interest $4,998 · savings: $1,291
The shorter term costs $130 more per month but saves $1,291 in total interest. If that payment fits your budget, the 48-month loan is the better financial decision by a significant margin.
Example 2: Impact of APR — dealer financing vs. credit union
Inputs: Price: $32,000 · Down: $3,200 · Tax: 7% · Fees: $600 · Term: 60 months
Result: Dealer at 8.9% APR: $614/mo · total interest $7,726 | Credit union at 6.5% APR: $577/mo · total interest $5,565 · savings: $2,161
Getting pre-approved at your credit union before visiting the dealer saves $37/month and $2,161 total. Pre-approval also gives you a rate benchmark to negotiate against the dealer's financing offer.
- ✕Negotiating on monthly payment instead of purchase price — dealers can hide cost in a longer term or higher rate while keeping the payment the same
- ✕Not getting pre-approved before the dealership — walking in without a rate benchmark gives dealers pricing power
- ✕Overlooking total interest paid on long-term (72–84 month) loans — the payment looks manageable but the total cost is much higher
- ✕Accepting dealer add-ons (gap insurance, extended warranty) without pricing them independently — they're often 30–50% cheaper elsewhere
- ✕Trading in a vehicle without knowing its actual market value — check Carmax, KBB, and Carvana offers first
What APR can I expect on a car loan?
As of 2024, average auto loan rates range from about 5–7% for buyers with excellent credit (720+) to 10–15% for buyers with fair credit (580–670). New car loans typically carry lower rates than used. Credit unions often offer rates 1–2% below dealers. Getting pre-approved before visiting the dealership gives you a benchmark and negotiating leverage.
Is a 72-month or 84-month auto loan a bad idea?
Generally yes, for two reasons. First, significantly more total interest — often $2,000–4,000 more than a 48-month loan on the same vehicle. Second, cars depreciate fast, and longer terms mean years underwater (owing more than the car is worth). If your car is totaled while underwater, insurance pays market value, not your loan balance. If you need a 72-month term to afford the payment, the car is likely too expensive for your budget.
Should I put more money down on a car?
Generally yes if you can, up to a point. A larger down payment reduces your loan amount, lowering both monthly payment and total interest. It also reduces time spent underwater. A common guideline: 20% down on a new car, 10% on used. That said, depleting your emergency fund for a down payment creates its own risk — balance these priorities.
How does the sales tax calculation work?
In most states, sales tax is calculated on the full purchase price. A few states (like Virginia and New Jersey) allow you to subtract your trade-in value before applying tax, which reduces the taxable amount. The calculator assumes tax on the full price by default — verify your state's rules for the most accurate estimate.
Should I lease or buy?
Leasing offers lower monthly payments and a new car every few years, but you build zero equity and face mileage penalties. Buying costs more per month but you own the asset. Buying wins financially if you keep the car 5+ years after paying it off. Leasing can win if you value the latest features, drive fewer than 12,000 miles/year, and factor in the lower payment as savings invested elsewhere.