3. Is there a ban on corporate donations to political parties?

Law on Financing of Political Entities, Article 5, paragraph 1.2.

5.1  Political Subjects are allowed to receive contribution from: 
1.2. legal entities in the amount not exceeding ten thousand (10.000) Euro per calendar year. 

Political entities can receive donations from private companies, encompassing all forms of business entities, including corporations. However, there are limitations on the timing and the maximum amount of such contributions.