There used to be a tax to pay – 990 Pesetas if I remember right. However in all the official instructions I have read for renewing a residency card nowhere does it mention any tax / timbre.
I find it difficult to believe that there is an 18-month wait. My original card was done in a couple of weeks. However everything is possible.
I’m not going to bother with the application to renew for a few more weeks. When I get round to it I’ll let you know if there are any surprises. Likewise please let me know if you meet with any bureaucratic surprises should you start before me.