[extraduder_ire]

There's usually a time limit on that. Last I checked in my country it's six months before you have to register the car, get local plates, and pay VRT (vehicle registration tax) + VAT. Including the cost of VRT in the VAT calculation, resulting in double taxation.

You can't put foreign plates on an irish registered car without first bringing it out of the country and registering it abroad either. I don't think there's any tax due on re-importing a car that's already been registered however. (you even get the same plate numbers since they're consistently mapped 1-to-1 VIN-to-plate forever)

[glogla]

There is a legal limit, yes, but nobody checks it, so you can do it indefinitely. Around here, there's even a lot of people driving on fake "foreign" plates.