GAP Insurance and Total-Loss Loan Shortfall Calculator

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Table of contents

• How to use
• Common mistakes
• Definitions
• Methodology
• Limitations & assumptions
• Sources

GAP insurance: Coverage that may pay some or all of the difference between what a primary auto insurer pays after a total loss and what is owed on the vehicle loan, subject to the agreement's terms. [1]

Lender payoff amount: The amount the lender says is needed to satisfy the loan at that time. It can differ from the balance on a regular statement.

Net insurance payment: The insurer payment actually applied to the loan after the deductible and other settlement adjustments.

Actual cash value (ACV): The vehicle value used by the insurer before a deductible is taken out. In this calculator, gross ACV is used only for a percent-of-ACV GAP limit in a claim.

Deductible: The part of a covered loss taken out of the primary insurance settlement under the auto policy.

Loan shortfall: The signed difference between the loan amount at loss and the primary insurance amount applied to the loan. A positive value means the loan is higher.

GAP payout limit: A maximum benefit stated as a dollar amount or a percent of ACV that can reduce the estimated GAP payment.

Mistake: Using your original loan amount instead of the "Lender payoff amount."
Fix: Use a current payoff quote from the lender for a total-loss claim.

Mistake: Entering gross ACV as the "Net insurance payment applied to your loan."
Fix: Enter the payment after the deductible and settlement adjustments, or confirm the amount sent to the lender.

Mistake: Subtracting a deductible again from the "Net insurance payment applied to your loan."
Fix: Claim mode already uses the entered payment as net; enter the deductible only to check "How does GAP treat the deductible?"

Mistake: Choosing "Fully covered" for "How does GAP treat the deductible?" without checking the GAP agreement.
Fix: Select the wording that matches the agreement. If it has a maximum, choose limited coverage and enter the "Deductible coverage maximum."

Mistake: Typing a dollar amount into "Maximum GAP payment (percent of ACV)."
Fix: Enter the percent shown in the agreement, such as 25 for 25 percent, and use "Maximum GAP payment ($)" for a dollar maximum.

• This is an estimate based only on the amounts and policy terms entered. A lender payoff and insurer settlement can change before payment is finalized.
• Claim mode assumes "Net insurance payment applied to your loan" already reflects the deductible and other settlement adjustments. Do not enter gross ACV in that field.
• Planning mode estimates the primary insurance amount as "Estimated vehicle value" minus the entered deductible. It rejects a deductible greater than the vehicle value.
• "No stated payout cap" means the calculator applies no extra cap. It does not mean the agreement guarantees full payoff.
• Actual GAP coverage can be affected by exclusions, eligibility rules, missed payments, past-due amounts, fees, loan changes, and other agreement terms not entered here.
• A negative "Loan shortfall before GAP" means the entered primary insurance amount exceeds the entered loan amount. The calculator sets the estimated GAP payment to $0 in that case.

Calculation method

The calculator uses the lender payoff for a current claim and the current balance for planning. It uses the net insurer payment for a claim, so it does not subtract the deductible a second time from that payment.

loan amount at loss = lender payoff amount (claim) or current loan balance (planning)

primary insurance applied = net insurance payment (claim) or estimated vehicle value - deductible (planning)

loan shortfall before GAP = loan amount at loss - primary insurance applied

The deductible outside GAP coverage is $0 when fully covered. With limited coverage, it is the deductible minus the deductible coverage maximum, with a minimum of $0. When not covered, it is the full entered deductible.

eligible GAP shortfall = max(0, loan shortfall before GAP - uncovered deductible)

The policy limit is the eligible shortfall when no stated cap is selected, the entered dollar maximum for a dollar cap, or gross ACV times the entered percent divided by 100 for a percent-of-ACV cap. Planning mode uses estimated vehicle value as ACV for that cap.

estimated GAP payment = min(eligible GAP shortfall, policy payment limit)

estimated loan amount still unpaid after GAP = loan shortfall before GAP - estimated GAP payment

Mini-example

For a claim with a $28,000 lender payoff and a $24,000 net insurance payment, the shortfall before GAP is $4,000. If the $1,000 deductible is not covered and there is no stated payout cap, the eligible GAP shortfall is $3,000. The estimated GAP payment is $3,000, leaving $1,000 unpaid.

Calculation boundaries

The calculator preserves a negative loan shortfall instead of changing it to $0, because it shows that the entered primary insurance amount exceeds the entered loan amount. GAP payment is floored at $0 because GAP does not create a benefit when there is no eligible shortfall. The estimate cannot determine coverage exclusions or replace the final lender payoff, settlement notice, or GAP agreement.