Consumer & Commercial Auto Debt Underwriting Pure Edge Computation

Auto Loan APR Amortization, Tax & Negative Equity Calculator

Calculate authentic vehicle loan payments, trade-in equity shifts, state sales tax deductions, dealer doc fees, and loan-to-value (LTV) underwriting risks.

Formula: Monthly Payment = Financed Amount × [r(1+r)^n] / [(1+r)^n - 1]; Financed = Price + Tax + Fees - Down - Equity

Model Parameters

Vehicle Purchase Price ($)

Agreed selling price before sales tax, title, registration, or dealer documentation fees.

Cash Down Payment ($)

Upfront cash paid to reduce total financed principal.

Trade-In Vehicle Allowance ($)

Appraised dealership trade-in allowance for your current vehicle.

Trade-In Existing Loan Balance ($)

Remaining payoff balance on existing auto lien (higher than trade value creates negative equity).

Annual Percentage Rate (APR)

Annual auto loan interest rate offered based on your credit tier.

Repayment Term (Months)

months

Contract duration (standard tiers: 36, 48, 60, 72, or 84 months).

State & Local Sales Tax

Sales tax rate applied to net vehicle purchase price.

Dealer Documentation Fee ($)

Dealership administrative and title preparation documentation fee.

Outputs & Underwriting Summary

Calculation Status

MODERATE LTV

Verified Model

Estimated Monthly Payment

$662.06 / mo

Term: 60 months @ 6.8% APR

Total Interest & Financed Principal

$6128.60

Total Cost: $39723.60 (Financed: $33595.00)

Loan-to-Value (LTV) & Equity Underwriting

88.4% LTV at inception

Risk Assessment: MODERATE LTV | Net Trade Equity: $2000.00 (Tax: $2100.00, Doc: $495.00)

Financing $33,595.00 at 6.8% APR for 60 months results in $662.06/mo with $6,128.60 in total interest. Loan-to-Value (LTV) is 88.4%. Healthy equity position avoids negative equity exposure over standard vehicle depreciation curves.

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