10. Is there a ban on donations from corporations with government contracts to candidates?
Bulgaria
"(1) A party, a coalition or a nomination committee may not receive the following in connection with the election campaign: ... 2. financial resources from legal persons and from sole traders;..."
Source: Article 168 (1), The Election Code, 2014
There is a total ban on donations from legal persons, which implicitly makes impossible any donations from corporations with government contracts.