Property tax

I pay my Plovdiv taxes online, but it's a big city with a decent website. I don't know if everywhere in Bulgaria is as up to date.

Also, it needed a password/PIN to be issued, which required me to visit the office in person with my ID first. So if you're not in Bulgaria, this is probably a problem.

Epay.bg also has property tax payments, but you need your ID number and the "batch number". I'd guess this works if you have an invoice already. Otherwise, also a problem.

Separately, until I figured it out, I was very tardy both registering my property, and paying the taxes. There is a fine for late registration and late payment, but it wasn't very big. So, hopefully, it won't be too painful if you sort it out when you manage to get over here.