The UK car finance sector faces a potential £18 billion reckoning, with 3.5 million historic agreements now under regulatory scrutiny for undisclosed commission practices that may have inflated borrowing costs for millions of drivers. Consumer champion Martin Lewis has flagged this as potentially the next major mis-selling scandal, affecting anyone who financed a vehicle between 2007 and 2021.
The issue centres on discretionary commission arrangements where finance brokers could adjust interest rates upwards, pocketing larger fees whilst customers remained unaware of the markup. This created a fundamental conflict of interest—brokers were incentivised to secure higher-cost deals rather than the most competitive rates available. For affected consumers, this translates to potentially hundreds of pounds in overpaid interest charges per agreement.
The Financial Conduct Authority launched its formal investigation in January following a surge in consumer complaints. The regulator is examining whether these opaque commission structures constituted unfair treatment, with findings due in September. Should the FCA rule against lenders, industry analysts expect a compensation framework similar to the PPI scandal—which ultimately cost banks over £38 billion.
Lewis recommends affected consumers use Money Saving Expert's free checking tool to assess eligibility and lodge preliminary complaints with finance providers. Crucially, eligibility remains valid even if the vehicle or finance agreement has concluded, as lenders maintain accessible transaction records. The complaint process involves requesting original agreement details and confirmation of any discretionary commission payments.
Market implications are substantial, with major lenders already setting aside provisions for potential payouts. The 3.5 million agreements under examination represent a significant portion of the consumer finance market during this period. Early estimates suggest individual compensation could range from several hundred to thousands of pounds, depending on the original loan terms and commission levels applied.
Time-sensitive action is advisable, as regulatory timelines typically impose strict complaint deadlines once investigations conclude. Consumers should begin documentation gathering and submit initial enquiries to position themselves advantageously should the FCA mandate a formal compensation scheme.