Frequently Asked Questions
How accurate is this car payment calculator?
Our calculator uses the same standard amortization formula that banks and lenders use. Results are estimates based on the inputs you provide. Actual payments may vary due to fees, exact interest calculation methods, and lender-specific terms.
Is my data private?
Yes. All calculations happen entirely in your browser. No data is sent to our servers or any third party. If you use the save feature, your inputs are stored in your browser's local storage on your device only.
Is this financial advice?
No. This calculator provides estimates for informational purposes only. We are not financial advisors. Always consult with a qualified financial professional before making significant financial decisions like taking out an auto loan.
Can I export my results?
Yes. After calculating your results, a PDF Export button appears. Click it to download a print-friendly PDF that includes your input summary, payment breakdown, and full amortization schedule.
What is negative equity?
Negative equity (also called being 'upside down') occurs when you owe more on your current car loan than the vehicle is worth. If your trade-in value is less than your outstanding loan balance, the difference is negative equity. Our calculator lets you toggle this on and enter the amount to see how it affects your new loan.
How does the money factor work for leases?
The money factor is the lease equivalent of an interest rate. To convert a money factor to an approximate APR, multiply by 2,400. For example, a money factor of 0.00125 equals about 3% APR. Lower money factors mean lower finance charges on your lease.
What sales tax rate should I use?
Use the sales tax rate for the jurisdiction where you will register the vehicle, not where you purchase it. Rates vary by state and sometimes by county or city. Check your local tax authority's website for the exact rate.
How often is this calculator updated?
We review and update the calculator, default rates, and all content regularly to ensure accuracy. The default interest rates reflect current average market conditions as of 2025.
What loan term should I choose?
Shorter loan terms (36-48 months) result in higher monthly payments but significantly less total interest. Longer terms (60-84 months) lower your monthly payment but increase total cost and the risk of negative equity. Choose the shortest term you can comfortably afford.
How do I report a bug or error?
Please use our Contact page to report any bugs, calculation errors, or suggestions. Select 'Report a bug or error' from the subject dropdown and describe the issue in detail.
Does the calculator account for fees like registration and documentation?
The calculator focuses on the core loan or lease payment. Registration fees, documentation fees, and dealer add-ons vary widely and are not included in the base calculation. You can add these to the vehicle price or check our guide on calculating with tax and fees.
Can I compare different scenarios?
Yes. You can adjust your inputs and recalculate as many times as you want. We also have pre-built scenario pages that walk through common car-buying situations with detailed breakdowns.
Related Pages
This calculator provides estimates for informational purposes only. It is not financial advice.