The UK's Zero Emission Vehicle mandate, which came into force on 1 January 2024, is the single most important piece of automotive regulation in Britain since the catalytic converter requirement. It is also one of the most misunderstood. Here is what it actually requires, how manufacturers are responding, and what it means for anyone buying a new car in the UK.
The Core Mechanism
The ZEV mandate sets a minimum percentage of each manufacturer's annual new car sales that must be zero-emission (in practice, battery electric). For 2024, that target was 22%. It rises to 28% in 2025, 33% in 2026, and continues climbing annually until it reaches 100% in 2035. At that point, every new car sold in the UK must be zero-emission.
If a manufacturer fails to meet the target, they have three options. They can buy ZEV credits from another manufacturer that has exceeded its target (Tesla, for instance, regularly has surplus credits to sell). They can "borrow" credits from a future year, effectively promising to over-deliver later. Or they can pay a fine of 15,000 pounds per vehicle short of the target. That last option is deliberately punitive. A manufacturer selling 100,000 cars at 20% EV share (instead of the required 22%) would be 2,000 vehicles short, resulting in a theoretical fine of 30 million pounds.
Who Is Hitting the Target?
Tesla, unsurprisingly, exceeds the ZEV requirement by a wide margin since 100% of their sales are battery electric. BMW has been performing relatively well, partly thanks to strong iX1 and i4 sales. Hyundai/Kia, with their Ioniq 5, Ioniq 6, EV6, and EV9 lineup, have been close to or above target.
The manufacturers who have struggled most are those with strong fleet-dependent businesses selling predominantly ICE vehicles. Ford, Stellantis (Vauxhall, Peugeot, Citroen), and some Japanese brands have found the 22% target challenging. Their response has varied: some have offered aggressive EV discounts and financing deals to boost electric volumes, while others have reportedly restricted supply of their most popular petrol models to improve the ratio.
The Supply Side Effect
This is where the ZEV mandate gets controversial. By penalising manufacturers for selling too many petrol and diesel cars relative to EVs, the mandate creates an incentive to restrict ICE supply. Some buyers have reported longer wait times for popular petrol models that they suspect are being artificially constrained. Whether this is actually happening at scale is debated, but the economic logic is clear: if every additional petrol car sold makes the manufacturer's ZEV ratio worse, there is a financial incentive to slow-walk petrol deliveries.
What It Means for Buyers
For buyers considering an EV, the ZEV mandate is mostly good news. Manufacturers are competing harder for EV buyers, which means better deals, more aggressive lease rates, and more models to choose from. The used EV market is also benefiting as manufacturers push more new EVs into the market, which eventually flow into the second-hand pool.
For buyers who want a petrol or diesel car, the picture is more complicated. Prices on ICE models may hold higher because manufacturers have less incentive to discount them. Some niche models may be withdrawn from the UK market entirely if they sell in volumes too low to justify the ZEV compliance cost.
The Road to 2035
The mandate's trajectory is steep. Going from 22% in 2024 to 100% in 2035 requires roughly doubling the EV share every 3-4 years. The first few steps (22% to 33%) are achievable with current technology and pricing. The later steps (getting from 60% to 80% to 100%) will require EVs to reach price parity with ICE vehicles and charging infrastructure to be genuinely ubiquitous. Whether 2035 is realistic or whether the target will be pushed back remains one of the biggest open questions in UK automotive policy.
See how the UK's EV share compares to Ireland, India, and the US on AutoNergy. The Overview section tracks EV penetration rates across all four markets.