> There was an interesting case in Finland. Finnish customs used to apply a 22% tax (ELV) on top of the car tax for imported used cars from other EU countries. On top of that, Finnish law required VAT to be charged on the car tax itself.

There was no VAT payable on the car tax of imported cars, only the ELV (ei-arvonlisävero, literally "not value added tax").

The ELV idea was that for locally bought new cars you did have to pay VAT on car tax, but for used EU imports that was not legally possible (cannot charge VAT again when importing used item from another EU country), so an equivalent non-VAT tax was invented so the full tax (inc. VAT/ELV) stays the same.

But this was unfair for e.g. the reason that Finnish companies buying cars could deduct Finnish car tax VAT on local new cars on their VAT return but not the car tax ELV on imported used cars (since it was not VAT).