Cars & VehiclesLTV & Equity Protection
Car Down Payment Calculator
See how varying down payment amounts impact your monthly payment, total interest charges, loan-to-value (LTV) ratio, and risk of negative equity (underwater loan).
Down Payment & Equity Risk
Equity & LTV Analysis
Initial Loan-to-Value (LTV)
92.0%
Risk Level: Moderate Underwater Risk
Down Payment & Loan-to-Value (LTV) Analysis Formula
Initial LTV Ratio = (Total Financed Loan Amount / Vehicle Base Market Price) ร 100- LTV > 100%: High Risk of being immediately underwater when driving off the lot due to sales tax and rapid depreciation.
- LTV 85%โ100%: Moderate Risk of negative equity during years 1 and 2.
- LTV < 85% (20%+ Down): Healthy equity cushion protecting you in the event of an insurance total loss.
Step-by-Step Worked Example
Scenario: Comparing down payment tiers on a $35,000 vehicle at 6.5% APR over 60 months with 7% tax
Calculation Steps:
- 0% Down: Financed $37,450 | Payment: $733.25/mo | Total Int: $6,545 | LTV: 107.0% (High Risk)
- 10% Down: Financed $33,950 | Payment: $664.72/mo | Total Int: $5,933 | LTV: 97.0% (Moderate)
- 20% Down: Financed $30,450 | Payment: $596.19/mo | Total Int: $5,321 | LTV: 87.0% (Low Risk)
- 30% Down: Financed $26,950 | Payment: $527.67/mo | Total Int: $4,710 | LTV: 77.0% (Safe)
Result: Putting 20% down ($7,000) lowers monthly payments by $137.06/month and saves $1,224 in finance interest.
How to Use This Calculator
- 1Enter the vehicle price and local sales tax rate.
- 2Specify your current planned down payment and financing terms.
- 3Compare side-by-side tiers (0%, 10%, 20%, 30%) to find your ideal balance of monthly cash flow and equity.
Assumptions & Limitations
- A new vehicle loses roughly 10% to 20% of its market value in year one.
Frequently Asked Questions
Do I really need to put 20% down on a car?
Putting 20% down is ideal because it covers the initial sales tax, dealer fees, and first-year depreciation, ensuring you do not end up owing more than the vehicle is worth.
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