Electric vehicles will remain cheaper to own than petrol models despite losing their tax exemption from tomorrow, according to new research.
The Energy and Climate Intelligence Unit (ECIU) found that owners of the top 10 best-selling EVs will benefit from average annual savings of nearly £1,200 over the vehicle's lifetime.
These savings persist even as the Treasury removes EVs' exemption from Vehicle Excise Duty (VED) on Tuesday.
The think tank warns these changes could "undermine consumer confidence" in electric vehicles at a critical time.
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Electric vehicle uptake could be threatened by incoming car tax changes launching tomorrow
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From Tuesday, all EV owners will be charged at least the standard rate of £195 for the second year onward after a vehicle is registered.
New electric vehicles worth more than £40,000 will also face the Expensive Car Supplement of £425 annually from years two to six.
The VED changes were announced in November 2022 under the Conservative Government, but are being implemented by Labour.
Petrol and diesel car owners will also see rate increases, with those driving the largest and most polluting vehicles facing doubled first-year payments.
The research comes as the UK continues with the Zero Emission Vehicle (ZEV) mandate, which requires manufacturers to ensure a minimum proportion of their new cars and vans sold are zero emission.
The policy has been "successful in driving competition between manufacturers up, and driving EV prices down," according to the ECIU.
Colin Walker, ECIU head of transport, warned: "The Government is risking complacency if it is seen to be increasing the cost of running an EV at such a critical time in the country's EV transition.
"These new taxes could undermine consumer confidence and hold families back from making the move to electric driving, leaving them stuck paying a petrol premium to run more expensive combustion engine cars."
Experts have called for the Government to raise the threshold of the Expensive Car Supplement
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A Treasury spokesperson defended the changes, saying: "The shift to electric vehicles will support growth and productivity across the UK and is crucial for tackling climate change."
"Our approach ensures fiscal stability while providing incentives through the tax system such as freezing vehicle excise duty first year rates for EVs to encourage the transition to electric and zero emission vehicles."