UK Cars
Halfway Through: The ZEV Mandate Review Is Open and the Arguments Are In
The government's consultation on the future of the zero emission vehicle mandate closes next month. What is being reviewed, what each side wants, and what it means for car buyers.
The most consequential car policy argument in Britain is currently running in its middle weeks, and most drivers have never heard of it. The government's zero emission vehicle mandate review, opened by the Department for Transport on 14 August, is gathering evidence on how the UK's flagship electric car regulation should work for the rest of the decade, and it closes on 23 October. What comes out of it will shape which cars sit on dealer forecourts, how heavily they are discounted, and how fast the market keeps moving, so it is worth understanding what is actually being weighed.
What the mandate review is
The ZEV mandate, explained in plain terms in our guide to how its credit trading works, requires manufacturers to sell a rising percentage of zero emission vehicles each year, 28% of new cars in 2025, 33% in 2026, and onwards to a full stop for new pure petrol and diesel cars by 2030 and 100% zero emission by 2035. The current review, announced by the Department for Transport, invites views on the pathway to those targets, including whether the trajectory and its flexibilities are set at a level the market can actually deliver. As Autocar's coverage of the launch put it, one live possibility is softening the sales curve in the middle years.
The review is not a question of direction. Every party at the table, government, industry and the charging sector, is working towards the same 2030 and 2035 endpoints. The argument is about pace and mechanism: how steep the climb should be between now and then, and how much breathing room manufacturers get along the way.
The evidence both sides are carrying
The industry's case rests on the arithmetic of this year's market. Battery electric cars took a record 27.5% share in July, the strongest month ever, yet the full-year forecast sits around 27.4% against the mandate's 33% line for 2026, a gap we tracked in our mandate analysis. The industry body's chief executive has been blunt about how that gap is being bridged: manufacturer discounts averaging thousands of pounds per electric car, costing the industry billions, an approach he has called unsustainable. The SMMT's position entering the review is that the targets for the next three years need flexing to match real demand rather than being met with escalating discounting.
The counter-argument, from environmental groups and parts of the charging industry, is that the mandate is precisely what is manufacturing the demand. Discounts exist because manufacturers need credits, credits exist because the targets bind, and the buyer momentum of 2026, a market that grew every month for nine months while electric share climbed past a quarter, is the policy working as designed. Weaken the curve now, this side argues, and the signal that built sixty electric models on sale and a charging network past 121,000 points gets diluted at exactly the moment it is paying off.
What it means for buyers
For anyone buying a car in the next two years, this review probably matters more than any budget measure. If the mandate softens, the immediate effect would be on pricing: the aggressive discounts that have made 2026 such a buyer's market, an average of around £11,000 off each electric car by the industry's own accounting, exist because manufacturers are chasing compliance. Less compliance pressure would over time mean less discounting, and electric prices would find a steadier, higher level.
The other side of that trade is model choice and market stability. The industry's argument is that selling electric cars at a loss cannot continue indefinitely, and that a manufacturer pulling out of the UK market, or quietly rationing electric supply, helps nobody. A calmer compliance curve, on this view, keeps every brand fully committed to Britain.
Both things can be true, and the consultation exists precisely because they are. What buyers should watch is the language of the government's response, expected after the consultation closes in late October: flexibilities that smooth the middle years without touching the 2030 and 2035 endpoints would be the compromise most likely to satisfy both the industry's balance sheets and the market's momentum.
Where it sits in the autumn
The review's timetable stacks against a busy season. The consultation closes on 23 October, the same month the government responds to the separate question of how vans are coping with their electric targets, and it lands after a September plate-change month that will show, at peak volume, exactly how much demand exists without a new lever being pulled. The market is doing its part to inform the decision: July was the strongest electric month on record, August held a 29.8% share in low volume, and the used market has begun clearing stock at prices petrol cars cannot match.
Whatever the outcome, the direction of travel is settled and has been for years. What the next few weeks decide is the slope, and for once, the people making that call are explicitly asking to be told what the people buying the cars think.