Car Finance Complaints: How to Present a Clear, Evidence-Based Case

There is no wording trick that guarantees a larger car finance refund. A useful complaint makes it easier to identify the agreement, investigate your concern and explain a decision. The aim is an accurate outcome based on your circumstances, not the highest number an online calculator can produce.

This guide was checked on 28 October 2026.

Make one clear record for each agreement

Write down the lender, vehicle registration, approximate start date and agreement number if available. Keep copies of the contract, relevant statements and correspondence together. If you had several agreements, avoid combining their dates and payment figures in a single narrative.

The FCA's general complaints guidance recommends explaining what happened, when it happened and what you want the firm to do, while recording your contact. Use that structure, but check the current car finance timetable for the special rules affecting scheme complaints.

Separate evidence from recollection

State what the documents show and what you remember being told. If you do not know the commission type or amount, ask the lender to investigate it. Do not invent a figure or copy an allegation that does not fit your experience.

The Financial Ombudsman's car finance guidance describes evidence such as agreement documents and correspondence. Its assessment considers the facts and relevant rules, rather than how forcefully a complaint is written.

Check interest assumptions carefully

Do not automatically add 8% a year to a guessed overpayment. The Ombudsman's compensation guidance says its usual approach for deprivation-of-money interest changed for complaints referred from 1 January 2026 to a time-weighted Bank of England base rate plus one percentage point. Outcomes still depend on the case.

The FCA scheme has its own calculation rules. Our calculator illustrates assumptions and cannot reproduce a lender's assessment without its records. When a decision arrives, ask which method was used and query any specific error.

Keep control of correspondence and costs

Save the complaint acknowledgment and check each subsequent letter for a deadline or information request. If someone represents you, agree who will respond and ask for copies. Review the contract so you understand any fee before deciding what an offer would leave you with.

You can use our free complaint template to structure your account. The optional PDF generator has separate pricing; buying a document does not increase your legal entitlement.

Review the answer, not just the amount

Compare the lender's explanation with the documents you supplied. If you disagree, identify the missing evidence or mistaken assumption and use the review route in its letter. A clear challenge gives the lender something specific to reconsider; a demand for an unsupported headline sum does not.