Usually, micro-businesses conducted by a single person resort to the sole trader registration.
A foreign entrepreneur may register an ET (Sole trader company) only if he or she has a permanent residence permit in the territory of Republic Bulgaria, issued in accordance with the Law on Foreigners in Bulgaria.
The Bulgarian ET is a legal entity of the Commercial Law of Bulgaria. That kind of business structure has been preferred due to its many advantages and the ease of setting up. Sole trader (ET) business owners are also known as self-employed and it is a most freelancers option