Don’t worry - in my country (Finland) they already thought of that and instead of the emissions based annual road tax, which would of course be zero, they managed to add a ‘tax on driving power’ to electric cars.
Notwithstanding that electricity for any use already has a per KWh tax added. Plus sales tax of course.
Well, in Italy the road tax has always been on engine power.
Indeed the VAT is a nuisance, actually the most regressive form of taxation possible: rich people with enough income who can afford to spend only a fraction of it, end up paying VAT accordingly; while low income citizens who have to spend all their salary end up with an additional, significant tax burden on their whole net income.
Notwithstanding that electricity for any use already has a per KWh tax added. Plus sales tax of course.