Thanks Marta.
The reason I asked about regimen comuntario vs regimen general is that I am renewing my tarjeta de residencia de cuidadano and I need to show all documents again and actualizado like marriage certificate, etc. which aren't quick to get especially if you need to get them outside of the EU.
Now is it possible to change from regimen comunitario to regimen general if you have living in Spain continuously for five years?
Bookmarks