The challenges, filed by Volkswagen Financial Services, Mercedes-Benz Financial Services, Crédit Agricole Auto Finance and a consumer group represented by Courmacs Legal, attack the scheme from both the lender and borrower side. If any challenge succeeds, the carefully constructed framework could unravel, pushing millions of disputed commission agreements back into individual litigation and leaving dealer groups, brokers and fleet operators exposed to prolonged counterparty risk.

What the legal challenges argue

The motor finance scandal centres on undisclosed commission arrangements between lenders and dealers that left consumers unaware of how much intermediaries earned on their finance agreements. The Supreme Court ruled in 2025 largely in favour of lenders on two of three test cases, according to City AM reporting, but found that redress was warranted on grounds of "unfairness" where the commission charged was outsized.

That ruling prompted the FCA to design an industry-wide scheme. Its final rules, published at the end of March 2026, cut the estimated total bill from £11bn to £9.1bn and reduced qualifying agreements from 14.2 million to 12.1 million, with average individual payouts expected at around £830, according to the regulator's own figures.

The lender challenges focus on the FCA's application of the law relating to limitation periods, a technical but consequential point that determines whether consumers have suffered loss or damage for which compensation is payable. At least one applicant has also alleged unlawful interference with lenders' property rights under the Human Rights Act 1998, according to the FCA's statement.

On the consumer side, the omnibus claim filed on behalf of Consumer Voice by Courmacs Legal argues from the opposite direction, suggesting the scheme does not go far enough. The regulator therefore faces the unusual position of defending the same framework against parties who believe it is too generous and parties who believe it is too restrictive.

The FCA said it would "defend the scheme robustly" but acknowledged that all four challenges are calling for the Upper Tribunal to "quash or invalidate" it.

Why the FCA is telling lenders to plan for no scheme

The regulator's language was notably direct. In its statement, the FCA said: "It is important that all involved now also focus on contingency plans and prepare for the alternative scenario of no scheme, as we set out consistently through the consultation."

It added that it was "prudent… to supervise all lenders against a central planning assumption that under that scenario there would be no scheme."

That instruction carries weight. Should the scheme proceed unchallenged, compensation payments to consumers were expected to begin in late 2026. A successful legal challenge would delay that timeline indefinitely and force claims back into the courts or the Financial Ombudsman Service, where resolution is slower, less predictable and more expensive for all parties.

The FCA's contingency warning also reflects a pragmatic reading of the legal landscape. Four concurrent challenges, spanning both procedural and constitutional arguments, represent a broad front. Even if three fail, a single successful application could be enough to invalidate the scheme's legal basis.

Which lenders are fighting and which have accepted the terms

The split among lenders is stark. The three firms pursuing legal action, Volkswagen Financial Services, Mercedes-Benz Financial Services and Crédit Agricole Auto Finance, are all captive or specialist motor finance providers whose business models are built around dealer relationships. Their challenge suggests they view the scheme's terms as disproportionate to the liabilities they believe they owe.

On the other side, two of the most heavily exposed lenders have opted not to fight. Lloyds Banking Group (LSE: LLOY), which has set aside £2bn in provisions, said it was "disappointed" but confirmed it would not challenge the scheme, according to City AM. Santander UK raised its provisions to £640m, taking a first-quarter profit hit, but the Spanish banking group has also confirmed it will not mount a challenge.

The divergence creates an uneven playing field. Lenders that have provisioned and accepted the framework are pricing the cost into their balance sheets now. Those fighting in the Upper Tribunal face binary outcomes: either the scheme is struck down and their liabilities are potentially reduced, or the challenge fails and they must comply with a framework they have publicly opposed, possibly on a compressed timeline.

For the wider industry, the split matters because it introduces uncertainty about which lenders will be writing new motor finance business, and on what terms, while the legal process plays out.

What a collapsed scheme means for dealers and fleet operators

Most City coverage of the motor finance saga has focused on bank provisioning and earnings impact. But the operational consequences sit further down the chain, in the showrooms, workshops and fleet yards that depend on motor finance to function.

Dealer groups

Dealer groups that earned commissions on finance introductions during the period in question face a dual problem. Under the FCA's scheme, liability was allocated primarily to lenders, with a structured process for any contribution claims against intermediaries. If the scheme collapses, that structure disappears. Individual consumers, or claims management companies acting on their behalf, could pursue dealers directly. The cost of defending those claims, even where the dealer's liability is limited, would fall on businesses that typically operate on thin margins.

Credit availability is the second concern. Lenders fighting the scheme may tighten underwriting criteria or pull back from certain dealer relationships while their legal exposure remains unquantified. Dealer groups that rely on a single captive finance provider, particularly one of the three challengers, should be assessing concentration risk now.

Fleet operators

Fleet-dependent businesses face a different but related set of pressures. Many SMEs finance vehicles through hire purchase or personal contract purchase agreements that fall within the scope of the original commission complaints. A protracted legal process could slow the replacement cycle if lenders restrict new lending or reprice risk.

There is also a counterparty question. Fleet operators with vehicles financed through a lender that is challenging the scheme may find that lender's appetite for renewals or extensions changes during the litigation period. Businesses running large fleets would be prudent to review their financing arrangements and ensure they are not over-reliant on a single provider.

Brokers and intermediaries

Motor finance brokers sit in a similar position to dealer groups. The FCA's scheme offered a degree of certainty about how intermediary liability would be handled. Without it, brokers face the prospect of ad hoc claims with no standardised methodology for calculating redress. For smaller brokers, the legal costs alone could be existential.

What happens next

The Upper Tribunal will now consider the four challenges. No hearing date has been confirmed. The FCA has indicated it will continue to supervise lenders on the assumption that the scheme may not proceed, which in practice means firms must maintain provisions and contingency plans simultaneously.

For businesses across the motor trade, the message is clear: the £9.1bn scheme was designed to draw a line under the scandal, but that line is now contested from both sides. Planning for a resolution that may not arrive on schedule is no longer optional.