Auto Loan Calculator
Reveal the true amount financed, monthly payment, and total interest on any vehicle purchase including sales tax, trade-in value, and dealer fees.
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Enter your values above to see the results.
Tips & Notes
- ✓Get pre-approved financing from your bank or credit union before visiting the dealer — it gives you a rate benchmark and negotiating leverage on the lot.
- ✓Negotiate the vehicle price before mentioning your trade-in or financing — dealers bundle all three to obscure where profit is being made.
- ✓A 1% rate difference on a $30,000 60-month loan costs roughly $900 extra in total interest — shopping lenders is worth more than most buyers realize.
- ✓Avoid extending the loan term just to reach a target monthly payment — each extra year typically adds $1,000-$1,500 in total interest on a $30,000 loan.
- ✓Sales tax is typically added to the financed amount, not paid upfront — make sure your budget accounts for this addition to the loan balance.
- ✓Check your loan payoff amount before trading in early — if you owe more than the car is worth, the negative equity rolls into the new loan and compounds.
Common Mistakes
- ✗Negotiating monthly payment instead of purchase price — dealers can make a $3,000 price increase invisible by extending the term two months.
- ✗Accepting the dealer financing rate without shopping — dealership rates are often 1-2% above what your bank or credit union would offer for the same loan.
- ✗Financing fees and add-ons without noticing — $2,000 in dealer fees financed at 7.5% over 60 months costs an additional $405 in interest.
- ✗Choosing a 72 or 84-month term to lower the payment without modeling the depreciation gap — you may owe more than the car is worth for years.
- ✗Forgetting sales tax in affordability calculations — 8% tax on a $32,000 vehicle adds $2,560 to the financed amount before any fees.
- ✗Rolling negative equity from a previous loan into a new loan — this compounds the debt and frequently leads to being underwater on the new vehicle as well.
Auto Loan Calculator Overview
An auto loan calculator gives you the real numbers before the dealer does. Vehicle price is only the starting point — sales tax, fees, trade-in value, and down payment all change what you actually finance, and the interest rate determines how much extra you pay on top of that.
Most buyers focus on the monthly payment. The dealer knows this and uses it. The number that actually matters is total interest paid, which this calculator shows alongside the monthly figure.
What each field means:
- Vehicle Price — the agreed purchase price before tax and fees
- Down Payment — cash you pay upfront; reduces the financed amount and total interest
- Trade-In Value — the credit applied from your current vehicle; acts identically to a down payment
- Fees — dealer fees, documentation fees, registration; added to the financed amount
- Sales Tax Rate — applied to the purchase price in most states; typically financed into the loan
- Interest Rate — annual rate from the lender; even 1% difference costs hundreds over the loan term
- Loan Term — repayment period in months; longer term means lower payment but far more total interest
What your results mean:
- Amount Financed — the actual loan amount after down payment, trade-in, tax, and fees
- Monthly Payment — fixed amount due each month for the full term
- Total Interest — what the lender earns; the real additional cost of financing
- Total Paid — amount financed plus all interest; the complete cost of ownership financing
A full example — $32,000 vehicle, $3,000 down, $2,000 trade-in, 7.5% rate, 60 months:
Vehicle price: $32,000 Sales tax (8%): $2,560 Fees: $800 Less down payment: $3,000 Less trade-in: $2,000 Amount financed: $30,360 Monthly payment at 7.5% / 60 months: $608 Total interest: $6,120 Total paid: $36,480 for a $32,000 car
EX: How term length changes the real cost on $30,000 at 7.5% 36 months: $934/month, total interest $3,624 48 months: $726/month, total interest $4,848 60 months: $601/month, total interest $6,060 72 months: $519/month, total interest $7,368 Every 12 extra months saves $82/month but adds roughly $1,200 in total interest.
Monthly payment by loan amount and rate (60-month term):
| Loan Amount | 5.5% | 7.5% | 10.0% |
|---|---|---|---|
| $20,000 | $383 | $401 | $425 |
| $30,000 | $574 | $601 | $637 |
| $40,000 | $765 | $801 | $850 |
| $50,000 | $957 | $1,001 | $1,062 |
Term comparison — $30,000 at 7.5%:
| Term | Monthly Payment | Total Interest |
|---|---|---|
| 36 months | $934 | $3,624 |
| 48 months | $726 | $4,848 |
| 60 months | $601 | $6,060 |
| 72 months | $519 | $7,368 |
Financing a vehicle for longer than you plan to own it creates a dangerous gap between what you owe and what the car is worth. A new car loses roughly 20% of its value in the first year and another 15% in year two. A 72-month loan on a $35,000 vehicle means you may owe more than the car is worth for the first three years — leaving you financially exposed if you need to sell or the car is totaled.
Frequently Asked Questions
For buyers with credit scores above 720, auto loan rates below 5% are competitive for new vehicles and below 7% for used. Scores between 660-719 typically see rates of 6-9%. Below 620, rates climb to 10-15% or higher. Credit unions consistently offer rates 1-2% below dealership financing for equivalent credit profiles. Getting pre-approved before visiting a dealer gives you a concrete benchmark and shifts negotiation power away from the finance office.
A larger down payment reduces the financed amount, total interest paid, and the risk of going underwater on the loan. On a $30,000 vehicle at 7.5% over 60 months, increasing the down payment from $3,000 to $6,000 saves approximately $605 in total interest and reduces monthly payment by $60. More importantly, a 20% down payment on a new vehicle keeps you roughly above water on the loan through the first year, when depreciation is steepest.
The shortest term whose monthly payment you can genuinely sustain is almost always the best financial choice. A 36-month loan on $30,000 at 7.5% saves $3,744 in total interest versus a 72-month term and leaves you with an unencumbered asset two years sooner. If the 36-month payment is too high, 48 months is a reasonable compromise. Avoid terms beyond 60 months unless the vehicle is new and expected to last well beyond the loan payoff.
The financed amount typically includes the vehicle price, plus applicable sales tax, dealer documentation fees, registration and title fees, and any add-ons like extended warranties or gap insurance — minus the down payment and trade-in credit. This is why the actual loan amount often surprises buyers who budgeted for just the vehicle price. Always ask for a complete itemization of what is being financed before signing.
Gap insurance covers the difference between what you owe on the loan and what the car is actually worth if it is totaled or stolen. It matters most when you finance more than 80% of the vehicle value, choose a long loan term, or buy a vehicle that depreciates quickly. If you put 20% down on a 36-month loan, gap insurance is rarely necessary. If you put 5% down on a 72-month loan, gap coverage protects against a scenario where insurance pays the market value but leaves you owing thousands more.
Buying is almost always less expensive over a 5-10 year horizon. Leasing provides lower monthly payments and a new vehicle every few years but builds no equity and comes with mileage limits and condition penalties. Leasing makes financial sense for business owners who deduct vehicle expenses, drivers who need a new vehicle every 2-3 years and always trade in, and buyers who want a vehicle whose purchase price exceeds their budget. For everyone else, buying and holding for 8-10 years is the lowest total cost of vehicle ownership available.