Auto Loan Calculator — Dealership Ready
Calculate your real monthly car payment including trade-in value, negative equity, sales tax (applied to price minus trade-in), and all dealer fees. The tool to use at the dealership.
Auto Loan
Results update instantly as you type
Enter Values
Sales Tax (8% on $32,000.00 — price minus trade-in)
$2,560.00
Title, Registration & Doc Fees
$500.00
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<iframe src="http://127.0.0.1:54963/embed/automotive/auto-loan-calculator?ref=embed" title="Auto Loan Calculator — Dealership Ready" width="100%" style="max-width:600px; border:none; height:500px;" loading="lazy"></iframe>
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Monthly Payment
$926.79
The Formula
Monthly payment uses the standard amortization formula. Sales tax is applied only to the taxable amount (vehicle price minus positive trade-in equity), which is how most states calculate it.
Variable Definitions
Loan Terms (Principal, Rate, Months)
Principal = Price + Tax + Fees + Negative Equity − Down − Trade-In. Monthly rate r = APR ÷ 12. Term n in months (typical: 36-84). These three values determine your monthly payment through the standard amortization formula.
Underwater Trade-In
When you owe more on your trade-in than it's worth, the difference is added to your new loan principal.
How to Use This Calculator
- 1
Enter the agreed vehicle price.
- 2
Select your loan term and enter your APR.
- 3
Enter your cash down payment, trade-in value, and any remaining loan balance on the trade-in.
- 4
Add your local sales tax rate and any title/registration/doc fees.
- 5
The calculator applies sales tax only to (price − trade-in value), as most states require.
Common Applications
- Comparing loan offers from dealerships, banks, and credit unions to find the best interest rate and monthly payment
- Budgeting for a new or used car purchase by estimating monthly payments before visiting a dealer
- Deciding between different loan terms (36 vs 60 vs 72 months) to balance payment affordability against total interest cost
- Evaluating the impact of down payment size, trade-in value, and sales tax on the total financed amount
Auto loan breakdown — vehicle price minus down payment equals financed amount
Understanding the Concept
Most auto loan calculators miss the details that actually matter at the dealership. This one correctly handles negative equity (when your trade-in is "underwater" — you owe more than it's worth), applies sales tax only to the taxable amount as most states require, and includes the flat fees that push your actual loan higher. Longer loan terms (72–84 months) dramatically increase total interest and risk of negative equity on your next trade-in.
Frequently Asked Questions
Sources & References
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