Major U.K. lenders are bracing for a significantly larger financial impact from the ongoing regulatory probe into historic car finance commissions, with several prominent banks signalling a need to set aside more money for potential customer compensation. The warnings from Lloyds Banking Group, Close Brothers, and Bank of Ireland sent their shares tumbling as investors grappled with the prospect of ballooning redress costs.

This latest development underscores the growing anxiety within the financial sector over the scale of the liabilities stemming from the Financial Conduct Authority (FCA)'s investigation. The probe specifically targets discretionary commission arrangements (DCAs), a practice common before January 2021 where brokers and dealers could adjust the interest rates on car loans, earning a higher commission for charging customers more. The FCA is currently assessing whether these arrangements led to widespread consumer harm and whether compensation is due.

Lloyds Banking Group, a dominant player in the U.K. car finance market through its Black Horse brand, indicated that the potential costs could exceed its initial estimates. While the bank hadn't yet made specific provisions for the issue, its caution signals an expectation of substantial future charges. Crucially, this comes after the FCA's announcement in January that it was reviewing whether consumers were unfairly charged, leading to a pause in complaints processing and creating significant uncertainty for lenders.

Meanwhile, specialist lender Close Brothers was more explicit, announcing that it would likely need to increase its provisions for motor finance redress. The bank revealed it's facing a higher volume of complaints than anticipated, suggesting the issue is gaining traction among consumers. Similarly, Bank of Ireland, which has a significant presence in the U.K. market, also flagged the potential for increased provisions, reflecting a sector-wide concern that the redress bill could dwarf initial expectations.

The market reaction was swift and unforgiving. Shares in the affected banks, particularly Close Brothers, saw sharp declines following their announcements. Investors are clearly wary, fearing a scenario reminiscent of the Payment Protection Insurance (PPI) scandal, which cost the industry tens of billions of pounds. What's more, the lack of clarity from the FCA on the methodology for calculating potential redress, or even if compensation will be mandated, only exacerbates this uncertainty.

Industry insiders suggest that the FCA's investigation is still in its early stages, with a final decision not expected until September. However, the increasing number of customer complaints and the proactive warnings from banks indicate that the financial consequences could be significant. Lenders are now grappling with the operational complexities of potentially reviewing millions of historic car finance agreements, a process that promises to be both costly and time-consuming, further impacting their bottom lines. The full extent of this "heavier hit" remains to be seen, but the signals from the banking sector are unequivocally grim.