CO2 tax rules for PHEVs are about to get tougher in the EU - but it's good news for UK drivers...
Under the changes, t he European Commission's latest Euro 6e-bis emission standard will assume a lower share of a PHEV's electric-only mileage, resulting in a more representative (and higher) CO2 figure.
This would result in tax hikes and therefore a loss of the benefit-in-kind incentive that has driven the powertrain's popularity among fleet buyers.
However, the UK has revealed 'easement' plans to continue encouraging the take-up of lower-carbon vehicles.
What are the EU's changes?
The European Commission's latest Euro 6e-bis emission standard was introduced in January 2025 for new vehicle launches, and manufacturers have until the end of the year to retest their entire model range.
Although the focus is pollutant emissions, the new standard includes an adjusted 'utility factor' for PHEVs that assumes a lower share of that vehicle's mileage is driven on battery power, offering a more representative CO2 figure.
It follows a study of real-world data showing PHEVs emit three and a half times more CO2 on the road than during the official test cycle.
In December 2022, the International Council for Clean Transportation (ICCT) warned that Euro 6e could raise a 45g/km PHEV's CO2 emissions rating to 96g/km, then 122g/km when the second adjustment is applied in 2027. That's without any mechanical changes to the vehicle.
Although Euro 6e compliance isn't mandatory in post-Brexit UK (excluding Northern Ireland), vehicles engineered or retested for other markets would be imported with figures derived from the new test.
This could hurt manufacturers' ability to meet average CO2 targets (and earn credits that can be counted as zero-emission vehicle sales) and have tax implications for CO2-incentivised fleets, which account for more than 80% of new PHEVs.
Cars emitting 50g/km CO2 or less qualify for low company car tax bands and more generous relief from corporation tax. Businesses can offset 100% of lease costs, or 18% of the purchase cost, against their pre-tax profits. Those rates fall to 85% and 6% respectively above that threshold.
What is the UK planning?
In a statement, Treasury secretary James Murray confirmed plans for a two-year 'easement' from April 2026, enabling manufacturers to publish CO2 figures based on the outgoing Euro 6d standard – a proposal originally put forward as part of the ZEV mandate consultation last December.
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