Intra community services
Using your company in Bulgaria, you are able to perform intra-community services.
Generally it is a good idea to perform intra-community services through your Bulgarian company, because the taxes in Bulgaria are fairly low - the profit tax rate is 10%.
The intra-community services are exempt from the VAT.
As a foreigner, you don't have to pay social security in Bulgaria.
To prove the service, you need a contract with the customer (translated into Bulgarian language) and a declaration from the customer that he has received the services and what kind of services they are.
For your Bulgarian firm, we do not advise you to declare non-existing services or to trade with off-shore zones.