Free Auto Loan Calculator Spreadsheet
Car dealerships often negotiate on monthly payment amounts rather than the total purchase price, leading buyers to agree to extended loan terms (72 or 84 months) that accumulate excessive interest. This spreadsheet computes the exact mathematical financing cost including vehicle price, down payment, trade-in value, sales tax, APR, and term length, giving you leverage during purchase negotiations.
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Purpose & Design
Calculate your true monthly car payment and total cost of financing before stepping into an auto dealership or signing a vehicle financing agreement.
Included Worksheets:
Key Formulas & Calculations
This workbook comes pre-programmed with verified Excel formulas that recalculate instantly as you update your data:
- ✓Amount Financed = (Vehicle Price * (1 + Sales Tax %)) - Down Payment - Trade-in Credit
- ✓Monthly Payment = PMT formula based on interest rate, term in months, and financed amount
- ✓Total Interest = (Monthly Payment * Term Months) - Amount Financed
How to Use This Spreadsheet
- 1Enter the negotiated vehicle purchase price.
- 2Input your planned cash down payment and dealer trade-in credit allowance.
- 3Set your state and local sales tax percentage (e.g. 0.06 for 6%).
- 4Input the lender loan interest rate (APR) and financing term length in months (e.g. 36, 48, 60).
- 5Analyze the resulting monthly payment and total finance charges over the life of the loan.
Who Benefits from This Template?
- 💡Car buyers evaluating new or used vehicles who want an unbiased financial breakdown.
- 💡Borrowers deciding between taking dealer rebates versus manufacturer low-interest APR incentives.
- 💡Car owners planning to refinance their existing auto loans to secure lower monthly payments.
Prefer not to use a spreadsheet?
Track this free in your browser with zero setup or sign-up.
Frequently Asked Questions
What is the recommended car financing term?
Financial planners generally recommend limiting auto financing to 48 or 60 months and putting at least 10% to 20% down to avoid becoming "underwater" (owing more than the car is worth).
Does this calculator include dealer doc fees or licensing?
You can add dealer document fees and registration costs directly into the vehicle price cell for a comprehensive out-the-door total.