Robert Cornelius, President of Guernsey Motor Trade Association, said the tax may prevent people buying electric cars.
He said: “There’s a big incentive for someone to buy an electric vehicle because they’re not paying 90-something pence of duty per litre of fuel.
“If you reduce that, and then make additional charges, that potentially might not make it look as attractive to change to electric.”
Gabriel said previously there would be “no flat rate” of road tax.
He added: “A clean electric vehicle, for example, emitting zero on the roads will be paying less than an older vehicle.”
