Hi,
In Bulgaria you can play most rooms. Very few rooms are restricted for Bulgarian players. Some rooms (Stars, B365, Bwin) have gained official state licenses.
You pay no tax on both licensed and non-licensed room winnings. On Stars.bg I think you get a tiny amount of less Points, like 5.5 instead of 6 points.
Any more detailed questions let me know.
If you are looking for an accommodation to suit poker players needs, check out this one -
https://www.youtube.com/watch?v=AAHIX-Z536I