Build the calculation from source documents

The core inputs are the secured obligation, the reasonable expenses that the governing law and contract permit, the sale proceeds, and credits that reduce the balance. Model UCC § 9-615 directs the application of proceeds after disposition. In a consumer-goods transaction, § 9-616 addresses the explanation of a deficiency or surplus.

Request the payment history and a copy of the post-sale explanation if you do not already have them. Then list each fee by name instead of accepting one “repo costs” subtotal. Storage, towing, condition reports, auction charges, legal expenses, and other items can have different contractual or statutory treatment.

The sale price is one number, not the entire commercial-reasonableness inquiry

A low auction price is important evidence, but model § 9-627 states that a disposition is not automatically commercially unreasonable merely because a better price could have been obtained at another time or by another method. The inquiry can involve the method, manner, time, place, and other terms of the disposition.

That means a useful audit asks how the vehicle was marketed, whether it was a public or private sale, what condition information was available, whether the sale was to a related party, and whether the creditor followed the notice process. Price comparisons are strongest when paired with records showing why the actual disposition process was deficient.

Look for credits that may not be obvious on the first statement

Unused service-contract refunds, debt-cancellation or ancillary-product refunds, insurance refunds, returned payments, and later auction adjustments can change the balance depending on the contract and product terms. Do not assume they automatically apply; instead, ask whether a refund was due, who received it, and when it posted.

If the creditor’s explanation uses a category you do not recognize, request the underlying invoice or account code. A deficiency audit is not complete if the math adds up but one of the inputs is unexplained.

Separate the creditor’s claim from a collector’s itemization

A debt collector may later send validation information that itemizes interest, fees, payments, and credits from a specified itemization date. That document is useful, but it begins after the original creditor’s repossession accounting. Reconcile the collector’s opening balance to the creditor’s closing deficiency rather than treating them as separate debts.

If the two figures do not match, identify the exact date and transaction where they diverge. That creates a specific dispute that can be investigated, unlike a general statement that the balance “seems too high.”

Deficiency balance and deficiency judgment are separate stages

The post-sale balance is the amount asserted due. A deficiency judgment requires a court process when the creditor sues and obtains judgment. State law can restrict deficiency recovery or change the consequence of a defective notice or commercially unreasonable sale.

If suit is filed, the accounting work becomes evidence for the answer and defenses, but it does not replace the obligation to respond by the court deadline. Preserve the original sale documents in the same folder as the summons so the litigation record can be tied back to the repossession sequence.

Use a four-line reconciliation before deciding what is actually disputed

Write the secured balance immediately before applying sale proceeds; add only identified, documented charges; subtract the net sale proceeds; then subtract every later credit. Compare the result with the creditor’s deficiency explanation and the collector’s current itemization.

If the arithmetic matches, the remaining questions are legal or factual inputs: was the sale conducted properly, are the charges allowed, were all credits included, and is the claim timely? If the arithmetic does not match, you have a narrower first question—where did the ledger diverge?

Trace the account from repossession date through final credits

A useful deficiency audit is chronological rather than impressionistic. Start with the payoff or accelerated balance shown immediately before disposition. Then list repossession, storage, conditioning, auction, transportation, and legal charges separately instead of accepting one combined “fees” line. Put the gross sale price and net proceeds on different lines when the auction deducted its own charges before remitting money to the secured party. That prevents an auction fee from being counted twice.

Continue the ledger past the sale date. Cancellation of a vehicle-service contract, GAP product, credit insurance, maintenance plan, or other financed add-on can create a later credit if the product terms require a refund. A later insurance recovery, auction adjustment, reversed fee, or payment can matter too. The practical question is not whether a category sounds plausible; it is whether the amount appears in the contract, sale records, and final account history in a way that can be reconciled.

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